1 | define(["../_base/kernel", "../_base/lang", "../_base/declare", "../_base/array", "../_base/xhr", |
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2 | "../Evented", "../_base/window", "./util/filter", "./util/simpleFetch", "../date/stamp" |
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3 | ], function(kernel, lang, declare, array, xhr, Evented, window, filterUtil, simpleFetch, dateStamp) { |
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4 | // module: |
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5 | // dojo/data/ItemFileReadStore |
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6 | // summary: |
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7 | // TODOC |
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8 | |
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9 | |
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10 | var ItemFileReadStore = declare("dojo.data.ItemFileReadStore", [Evented],{ |
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11 | // summary: |
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12 | // The ItemFileReadStore implements the dojo.data.api.Read API and reads |
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13 | // data from JSON files that have contents in this format -- |
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14 | // { items: [ |
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15 | // { name:'Kermit', color:'green', age:12, friends:['Gonzo', {_reference:{name:'Fozzie Bear'}}]}, |
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16 | // { name:'Fozzie Bear', wears:['hat', 'tie']}, |
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17 | // { name:'Miss Piggy', pets:'Foo-Foo'} |
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18 | // ]} |
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19 | // Note that it can also contain an 'identifer' property that specified which attribute on the items |
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20 | // in the array of items that acts as the unique identifier for that item. |
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21 | // |
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22 | constructor: function(/* Object */ keywordParameters){ |
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23 | // summary: constructor |
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24 | // keywordParameters: {url: String} |
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25 | // keywordParameters: {data: jsonObject} |
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26 | // keywordParameters: {typeMap: object) |
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27 | // The structure of the typeMap object is as follows: |
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28 | // { |
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29 | // type0: function || object, |
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30 | // type1: function || object, |
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31 | // ... |
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32 | // typeN: function || object |
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33 | // } |
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34 | // Where if it is a function, it is assumed to be an object constructor that takes the |
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35 | // value of _value as the initialization parameters. If it is an object, then it is assumed |
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36 | // to be an object of general form: |
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37 | // { |
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38 | // type: function, //constructor. |
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39 | // deserialize: function(value) //The function that parses the value and constructs the object defined by type appropriately. |
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40 | // } |
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41 | |
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42 | this._arrayOfAllItems = []; |
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43 | this._arrayOfTopLevelItems = []; |
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44 | this._loadFinished = false; |
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45 | this._jsonFileUrl = keywordParameters.url; |
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46 | this._ccUrl = keywordParameters.url; |
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47 | this.url = keywordParameters.url; |
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48 | this._jsonData = keywordParameters.data; |
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49 | this.data = null; |
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50 | this._datatypeMap = keywordParameters.typeMap || {}; |
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51 | if(!this._datatypeMap['Date']){ |
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52 | //If no default mapping for dates, then set this as default. |
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53 | //We use the dojo.date.stamp here because the ISO format is the 'dojo way' |
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54 | //of generically representing dates. |
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55 | this._datatypeMap['Date'] = { |
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56 | type: Date, |
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57 | deserialize: function(value){ |
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58 | return dateStamp.fromISOString(value); |
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59 | } |
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60 | }; |
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61 | } |
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62 | this._features = {'dojo.data.api.Read':true, 'dojo.data.api.Identity':true}; |
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63 | this._itemsByIdentity = null; |
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64 | this._storeRefPropName = "_S"; // Default name for the store reference to attach to every item. |
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65 | this._itemNumPropName = "_0"; // Default Item Id for isItem to attach to every item. |
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66 | this._rootItemPropName = "_RI"; // Default Item Id for isItem to attach to every item. |
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67 | this._reverseRefMap = "_RRM"; // Default attribute for constructing a reverse reference map for use with reference integrity |
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68 | this._loadInProgress = false; //Got to track the initial load to prevent duelling loads of the dataset. |
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69 | this._queuedFetches = []; |
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70 | if(keywordParameters.urlPreventCache !== undefined){ |
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71 | this.urlPreventCache = keywordParameters.urlPreventCache?true:false; |
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72 | } |
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73 | if(keywordParameters.hierarchical !== undefined){ |
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74 | this.hierarchical = keywordParameters.hierarchical?true:false; |
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75 | } |
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76 | if(keywordParameters.clearOnClose){ |
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77 | this.clearOnClose = true; |
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78 | } |
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79 | if("failOk" in keywordParameters){ |
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80 | this.failOk = keywordParameters.failOk?true:false; |
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81 | } |
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82 | }, |
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83 | |
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84 | url: "", // use "" rather than undefined for the benefit of the parser (#3539) |
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85 | |
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86 | //Internal var, crossCheckUrl. Used so that setting either url or _jsonFileUrl, can still trigger a reload |
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87 | //when clearOnClose and close is used. |
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88 | _ccUrl: "", |
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89 | |
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90 | data: null, // define this so that the parser can populate it |
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91 | |
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92 | typeMap: null, //Define so parser can populate. |
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93 | |
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94 | //Parameter to allow users to specify if a close call should force a reload or not. |
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95 | //By default, it retains the old behavior of not clearing if close is called. But |
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96 | //if set true, the store will be reset to default state. Note that by doing this, |
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97 | //all item handles will become invalid and a new fetch must be issued. |
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98 | clearOnClose: false, |
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99 | |
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100 | //Parameter to allow specifying if preventCache should be passed to the xhrGet call or not when loading data from a url. |
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101 | //Note this does not mean the store calls the server on each fetch, only that the data load has preventCache set as an option. |
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102 | //Added for tracker: #6072 |
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103 | urlPreventCache: false, |
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104 | |
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105 | //Parameter for specifying that it is OK for the xhrGet call to fail silently. |
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106 | failOk: false, |
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107 | |
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108 | //Parameter to indicate to process data from the url as hierarchical |
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109 | //(data items can contain other data items in js form). Default is true |
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110 | //for backwards compatibility. False means only root items are processed |
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111 | //as items, all child objects outside of type-mapped objects and those in |
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112 | //specific reference format, are left straight JS data objects. |
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113 | hierarchical: true, |
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114 | |
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115 | _assertIsItem: function(/* item */ item){ |
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116 | // summary: |
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117 | // This function tests whether the item passed in is indeed an item in the store. |
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118 | // item: |
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119 | // The item to test for being contained by the store. |
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120 | if(!this.isItem(item)){ |
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121 | throw new Error("dojo.data.ItemFileReadStore: Invalid item argument."); |
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122 | } |
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123 | }, |
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124 | |
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125 | _assertIsAttribute: function(/* attribute-name-string */ attribute){ |
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126 | // summary: |
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127 | // This function tests whether the item passed in is indeed a valid 'attribute' like type for the store. |
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128 | // attribute: |
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129 | // The attribute to test for being contained by the store. |
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130 | if(typeof attribute !== "string"){ |
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131 | throw new Error("dojo.data.ItemFileReadStore: Invalid attribute argument."); |
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132 | } |
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133 | }, |
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134 | |
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135 | getValue: function( /* item */ item, |
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136 | /* attribute-name-string */ attribute, |
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137 | /* value? */ defaultValue){ |
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138 | // summary: |
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139 | // See dojo.data.api.Read.getValue() |
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140 | var values = this.getValues(item, attribute); |
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141 | return (values.length > 0)?values[0]:defaultValue; // mixed |
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142 | }, |
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143 | |
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144 | getValues: function(/* item */ item, |
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145 | /* attribute-name-string */ attribute){ |
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146 | // summary: |
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147 | // See dojo.data.api.Read.getValues() |
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148 | |
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149 | this._assertIsItem(item); |
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150 | this._assertIsAttribute(attribute); |
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151 | // Clone it before returning. refs: #10474 |
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152 | return (item[attribute] || []).slice(0); // Array |
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153 | }, |
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154 | |
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155 | getAttributes: function(/* item */ item){ |
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156 | // summary: |
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157 | // See dojo.data.api.Read.getAttributes() |
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158 | this._assertIsItem(item); |
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159 | var attributes = []; |
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160 | for(var key in item){ |
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161 | // Save off only the real item attributes, not the special id marks for O(1) isItem. |
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162 | if((key !== this._storeRefPropName) && (key !== this._itemNumPropName) && (key !== this._rootItemPropName) && (key !== this._reverseRefMap)){ |
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163 | attributes.push(key); |
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164 | } |
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165 | } |
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166 | return attributes; // Array |
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167 | }, |
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168 | |
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169 | hasAttribute: function( /* item */ item, |
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170 | /* attribute-name-string */ attribute){ |
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171 | // summary: |
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172 | // See dojo.data.api.Read.hasAttribute() |
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173 | this._assertIsItem(item); |
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174 | this._assertIsAttribute(attribute); |
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175 | return (attribute in item); |
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176 | }, |
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177 | |
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178 | containsValue: function(/* item */ item, |
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179 | /* attribute-name-string */ attribute, |
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180 | /* anything */ value){ |
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181 | // summary: |
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182 | // See dojo.data.api.Read.containsValue() |
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183 | var regexp = undefined; |
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184 | if(typeof value === "string"){ |
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185 | regexp = filterUtil.patternToRegExp(value, false); |
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186 | } |
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187 | return this._containsValue(item, attribute, value, regexp); //boolean. |
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188 | }, |
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189 | |
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190 | _containsValue: function( /* item */ item, |
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191 | /* attribute-name-string */ attribute, |
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192 | /* anything */ value, |
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193 | /* RegExp?*/ regexp){ |
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194 | // summary: |
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195 | // Internal function for looking at the values contained by the item. |
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196 | // description: |
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197 | // Internal function for looking at the values contained by the item. This |
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198 | // function allows for denoting if the comparison should be case sensitive for |
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199 | // strings or not (for handling filtering cases where string case should not matter) |
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200 | // |
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201 | // item: |
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202 | // The data item to examine for attribute values. |
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203 | // attribute: |
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204 | // The attribute to inspect. |
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205 | // value: |
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206 | // The value to match. |
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207 | // regexp: |
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208 | // Optional regular expression generated off value if value was of string type to handle wildcarding. |
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209 | // If present and attribute values are string, then it can be used for comparison instead of 'value' |
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210 | return array.some(this.getValues(item, attribute), function(possibleValue){ |
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211 | if(possibleValue !== null && !lang.isObject(possibleValue) && regexp){ |
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212 | if(possibleValue.toString().match(regexp)){ |
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213 | return true; // Boolean |
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214 | } |
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215 | }else if(value === possibleValue){ |
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216 | return true; // Boolean |
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217 | } |
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218 | }); |
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219 | }, |
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220 | |
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221 | isItem: function(/* anything */ something){ |
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222 | // summary: |
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223 | // See dojo.data.api.Read.isItem() |
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224 | if(something && something[this._storeRefPropName] === this){ |
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225 | if(this._arrayOfAllItems[something[this._itemNumPropName]] === something){ |
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226 | return true; |
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227 | } |
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228 | } |
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229 | return false; // Boolean |
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230 | }, |
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231 | |
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232 | isItemLoaded: function(/* anything */ something){ |
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233 | // summary: |
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234 | // See dojo.data.api.Read.isItemLoaded() |
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235 | return this.isItem(something); //boolean |
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236 | }, |
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237 | |
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238 | loadItem: function(/* object */ keywordArgs){ |
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239 | // summary: |
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240 | // See dojo.data.api.Read.loadItem() |
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241 | this._assertIsItem(keywordArgs.item); |
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242 | }, |
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243 | |
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244 | getFeatures: function(){ |
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245 | // summary: |
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246 | // See dojo.data.api.Read.getFeatures() |
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247 | return this._features; //Object |
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248 | }, |
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249 | |
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250 | getLabel: function(/* item */ item){ |
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251 | // summary: |
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252 | // See dojo.data.api.Read.getLabel() |
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253 | if(this._labelAttr && this.isItem(item)){ |
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254 | return this.getValue(item,this._labelAttr); //String |
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255 | } |
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256 | return undefined; //undefined |
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257 | }, |
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258 | |
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259 | getLabelAttributes: function(/* item */ item){ |
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260 | // summary: |
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261 | // See dojo.data.api.Read.getLabelAttributes() |
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262 | if(this._labelAttr){ |
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263 | return [this._labelAttr]; //array |
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264 | } |
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265 | return null; //null |
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266 | }, |
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267 | |
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268 | _fetchItems: function( /* Object */ keywordArgs, |
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269 | /* Function */ findCallback, |
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270 | /* Function */ errorCallback){ |
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271 | // summary: |
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272 | // See dojo.data.util.simpleFetch.fetch() |
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273 | var self = this, |
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274 | filter = function(requestArgs, arrayOfItems){ |
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275 | var items = [], |
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276 | i, key; |
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277 | if(requestArgs.query){ |
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278 | var value, |
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279 | ignoreCase = requestArgs.queryOptions ? requestArgs.queryOptions.ignoreCase : false; |
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280 | |
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281 | //See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the |
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282 | //same value for each item examined. Much more efficient. |
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283 | var regexpList = {}; |
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284 | for(key in requestArgs.query){ |
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285 | value = requestArgs.query[key]; |
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286 | if(typeof value === "string"){ |
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287 | regexpList[key] = filterUtil.patternToRegExp(value, ignoreCase); |
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288 | }else if(value instanceof RegExp){ |
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289 | regexpList[key] = value; |
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290 | } |
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291 | } |
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292 | for(i = 0; i < arrayOfItems.length; ++i){ |
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293 | var match = true; |
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294 | var candidateItem = arrayOfItems[i]; |
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295 | if(candidateItem === null){ |
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296 | match = false; |
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297 | }else{ |
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298 | for(key in requestArgs.query){ |
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299 | value = requestArgs.query[key]; |
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300 | if(!self._containsValue(candidateItem, key, value, regexpList[key])){ |
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301 | match = false; |
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302 | } |
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303 | } |
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304 | } |
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305 | if(match){ |
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306 | items.push(candidateItem); |
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307 | } |
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308 | } |
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309 | findCallback(items, requestArgs); |
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310 | }else{ |
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311 | // We want a copy to pass back in case the parent wishes to sort the array. |
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312 | // We shouldn't allow resort of the internal list, so that multiple callers |
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313 | // can get lists and sort without affecting each other. We also need to |
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314 | // filter out any null values that have been left as a result of deleteItem() |
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315 | // calls in ItemFileWriteStore. |
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316 | for(i = 0; i < arrayOfItems.length; ++i){ |
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317 | var item = arrayOfItems[i]; |
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318 | if(item !== null){ |
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319 | items.push(item); |
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320 | } |
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321 | } |
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322 | findCallback(items, requestArgs); |
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323 | } |
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324 | }; |
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325 | |
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326 | if(this._loadFinished){ |
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327 | filter(keywordArgs, this._getItemsArray(keywordArgs.queryOptions)); |
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328 | }else{ |
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329 | //Do a check on the JsonFileUrl and crosscheck it. |
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330 | //If it doesn't match the cross-check, it needs to be updated |
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331 | //This allows for either url or _jsonFileUrl to he changed to |
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332 | //reset the store load location. Done this way for backwards |
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333 | //compatibility. People use _jsonFileUrl (even though officially |
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334 | //private. |
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335 | if(this._jsonFileUrl !== this._ccUrl){ |
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336 | kernel.deprecated("dojo.data.ItemFileReadStore: ", |
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337 | "To change the url, set the url property of the store," + |
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338 | " not _jsonFileUrl. _jsonFileUrl support will be removed in 2.0"); |
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339 | this._ccUrl = this._jsonFileUrl; |
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340 | this.url = this._jsonFileUrl; |
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341 | }else if(this.url !== this._ccUrl){ |
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342 | this._jsonFileUrl = this.url; |
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343 | this._ccUrl = this.url; |
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344 | } |
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345 | |
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346 | //See if there was any forced reset of data. |
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347 | if(this.data != null){ |
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348 | this._jsonData = this.data; |
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349 | this.data = null; |
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350 | } |
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351 | |
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352 | if(this._jsonFileUrl){ |
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353 | //If fetches come in before the loading has finished, but while |
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354 | //a load is in progress, we have to defer the fetching to be |
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355 | //invoked in the callback. |
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356 | if(this._loadInProgress){ |
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357 | this._queuedFetches.push({args: keywordArgs, filter: filter}); |
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358 | }else{ |
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359 | this._loadInProgress = true; |
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360 | var getArgs = { |
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361 | url: self._jsonFileUrl, |
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362 | handleAs: "json-comment-optional", |
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363 | preventCache: this.urlPreventCache, |
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364 | failOk: this.failOk |
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365 | }; |
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366 | var getHandler = xhr.get(getArgs); |
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367 | getHandler.addCallback(function(data){ |
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368 | try{ |
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369 | self._getItemsFromLoadedData(data); |
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370 | self._loadFinished = true; |
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371 | self._loadInProgress = false; |
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372 | |
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373 | filter(keywordArgs, self._getItemsArray(keywordArgs.queryOptions)); |
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374 | self._handleQueuedFetches(); |
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375 | }catch(e){ |
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376 | self._loadFinished = true; |
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377 | self._loadInProgress = false; |
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378 | errorCallback(e, keywordArgs); |
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379 | } |
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380 | }); |
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381 | getHandler.addErrback(function(error){ |
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382 | self._loadInProgress = false; |
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383 | errorCallback(error, keywordArgs); |
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384 | }); |
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385 | |
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386 | //Wire up the cancel to abort of the request |
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387 | //This call cancel on the deferred if it hasn't been called |
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388 | //yet and then will chain to the simple abort of the |
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389 | //simpleFetch keywordArgs |
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390 | var oldAbort = null; |
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391 | if(keywordArgs.abort){ |
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392 | oldAbort = keywordArgs.abort; |
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393 | } |
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394 | keywordArgs.abort = function(){ |
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395 | var df = getHandler; |
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396 | if(df && df.fired === -1){ |
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397 | df.cancel(); |
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398 | df = null; |
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399 | } |
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400 | if(oldAbort){ |
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401 | oldAbort.call(keywordArgs); |
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402 | } |
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403 | }; |
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404 | } |
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405 | }else if(this._jsonData){ |
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406 | try{ |
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407 | this._loadFinished = true; |
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408 | this._getItemsFromLoadedData(this._jsonData); |
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409 | this._jsonData = null; |
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410 | filter(keywordArgs, this._getItemsArray(keywordArgs.queryOptions)); |
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411 | }catch(e){ |
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412 | errorCallback(e, keywordArgs); |
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413 | } |
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414 | }else{ |
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415 | errorCallback(new Error("dojo.data.ItemFileReadStore: No JSON source data was provided as either URL or a nested Javascript object."), keywordArgs); |
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416 | } |
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417 | } |
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418 | }, |
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419 | |
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420 | _handleQueuedFetches: function(){ |
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421 | // summary: |
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422 | // Internal function to execute delayed request in the store. |
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423 | //Execute any deferred fetches now. |
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424 | if(this._queuedFetches.length > 0){ |
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425 | for(var i = 0; i < this._queuedFetches.length; i++){ |
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426 | var fData = this._queuedFetches[i], |
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427 | delayedQuery = fData.args, |
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428 | delayedFilter = fData.filter; |
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429 | if(delayedFilter){ |
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430 | delayedFilter(delayedQuery, this._getItemsArray(delayedQuery.queryOptions)); |
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431 | }else{ |
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432 | this.fetchItemByIdentity(delayedQuery); |
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433 | } |
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434 | } |
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435 | this._queuedFetches = []; |
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436 | } |
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437 | }, |
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438 | |
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439 | _getItemsArray: function(/*object?*/queryOptions){ |
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440 | // summary: |
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441 | // Internal function to determine which list of items to search over. |
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442 | // queryOptions: The query options parameter, if any. |
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443 | if(queryOptions && queryOptions.deep){ |
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444 | return this._arrayOfAllItems; |
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445 | } |
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446 | return this._arrayOfTopLevelItems; |
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447 | }, |
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448 | |
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449 | close: function(/*dojo.data.api.Request || keywordArgs || null */ request){ |
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450 | // summary: |
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451 | // See dojo.data.api.Read.close() |
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452 | if(this.clearOnClose && |
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453 | this._loadFinished && |
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454 | !this._loadInProgress){ |
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455 | //Reset all internalsback to default state. This will force a reload |
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456 | //on next fetch. This also checks that the data or url param was set |
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457 | //so that the store knows it can get data. Without one of those being set, |
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458 | //the next fetch will trigger an error. |
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459 | |
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460 | if(((this._jsonFileUrl == "" || this._jsonFileUrl == null) && |
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461 | (this.url == "" || this.url == null) |
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462 | ) && this.data == null){ |
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463 | console.debug("dojo.data.ItemFileReadStore: WARNING! Data reload " + |
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464 | " information has not been provided." + |
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465 | " Please set 'url' or 'data' to the appropriate value before" + |
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466 | " the next fetch"); |
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467 | } |
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468 | this._arrayOfAllItems = []; |
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469 | this._arrayOfTopLevelItems = []; |
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470 | this._loadFinished = false; |
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471 | this._itemsByIdentity = null; |
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472 | this._loadInProgress = false; |
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473 | this._queuedFetches = []; |
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474 | } |
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475 | }, |
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476 | |
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477 | _getItemsFromLoadedData: function(/* Object */ dataObject){ |
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478 | // summary: |
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479 | // Function to parse the loaded data into item format and build the internal items array. |
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480 | // description: |
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481 | // Function to parse the loaded data into item format and build the internal items array. |
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482 | // |
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483 | // dataObject: |
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484 | // The JS data object containing the raw data to convery into item format. |
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485 | // |
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486 | // returns: array |
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487 | // Array of items in store item format. |
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488 | |
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489 | // First, we define a couple little utility functions... |
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490 | var addingArrays = false, |
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491 | self = this; |
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492 | |
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493 | function valueIsAnItem(/* anything */ aValue){ |
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494 | // summary: |
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495 | // Given any sort of value that could be in the raw json data, |
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496 | // return true if we should interpret the value as being an |
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497 | // item itself, rather than a literal value or a reference. |
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498 | // example: |
---|
499 | // | false == valueIsAnItem("Kermit"); |
---|
500 | // | false == valueIsAnItem(42); |
---|
501 | // | false == valueIsAnItem(new Date()); |
---|
502 | // | false == valueIsAnItem({_type:'Date', _value:'1802-05-14'}); |
---|
503 | // | false == valueIsAnItem({_reference:'Kermit'}); |
---|
504 | // | true == valueIsAnItem({name:'Kermit', color:'green'}); |
---|
505 | // | true == valueIsAnItem({iggy:'pop'}); |
---|
506 | // | true == valueIsAnItem({foo:42}); |
---|
507 | return (aValue !== null) && |
---|
508 | (typeof aValue === "object") && |
---|
509 | (!lang.isArray(aValue) || addingArrays) && |
---|
510 | (!lang.isFunction(aValue)) && |
---|
511 | (aValue.constructor == Object || lang.isArray(aValue)) && |
---|
512 | (typeof aValue._reference === "undefined") && |
---|
513 | (typeof aValue._type === "undefined") && |
---|
514 | (typeof aValue._value === "undefined") && |
---|
515 | self.hierarchical; |
---|
516 | } |
---|
517 | |
---|
518 | function addItemAndSubItemsToArrayOfAllItems(/* Item */ anItem){ |
---|
519 | self._arrayOfAllItems.push(anItem); |
---|
520 | for(var attribute in anItem){ |
---|
521 | var valueForAttribute = anItem[attribute]; |
---|
522 | if(valueForAttribute){ |
---|
523 | if(lang.isArray(valueForAttribute)){ |
---|
524 | var valueArray = valueForAttribute; |
---|
525 | for(var k = 0; k < valueArray.length; ++k){ |
---|
526 | var singleValue = valueArray[k]; |
---|
527 | if(valueIsAnItem(singleValue)){ |
---|
528 | addItemAndSubItemsToArrayOfAllItems(singleValue); |
---|
529 | } |
---|
530 | } |
---|
531 | }else{ |
---|
532 | if(valueIsAnItem(valueForAttribute)){ |
---|
533 | addItemAndSubItemsToArrayOfAllItems(valueForAttribute); |
---|
534 | } |
---|
535 | } |
---|
536 | } |
---|
537 | } |
---|
538 | } |
---|
539 | |
---|
540 | this._labelAttr = dataObject.label; |
---|
541 | |
---|
542 | // We need to do some transformations to convert the data structure |
---|
543 | // that we read from the file into a format that will be convenient |
---|
544 | // to work with in memory. |
---|
545 | |
---|
546 | // Step 1: Walk through the object hierarchy and build a list of all items |
---|
547 | var i, |
---|
548 | item; |
---|
549 | this._arrayOfAllItems = []; |
---|
550 | this._arrayOfTopLevelItems = dataObject.items; |
---|
551 | |
---|
552 | for(i = 0; i < this._arrayOfTopLevelItems.length; ++i){ |
---|
553 | item = this._arrayOfTopLevelItems[i]; |
---|
554 | if(lang.isArray(item)){ |
---|
555 | addingArrays = true; |
---|
556 | } |
---|
557 | addItemAndSubItemsToArrayOfAllItems(item); |
---|
558 | item[this._rootItemPropName]=true; |
---|
559 | } |
---|
560 | |
---|
561 | // Step 2: Walk through all the attribute values of all the items, |
---|
562 | // and replace single values with arrays. For example, we change this: |
---|
563 | // { name:'Miss Piggy', pets:'Foo-Foo'} |
---|
564 | // into this: |
---|
565 | // { name:['Miss Piggy'], pets:['Foo-Foo']} |
---|
566 | // |
---|
567 | // We also store the attribute names so we can validate our store |
---|
568 | // reference and item id special properties for the O(1) isItem |
---|
569 | var allAttributeNames = {}, |
---|
570 | key; |
---|
571 | |
---|
572 | for(i = 0; i < this._arrayOfAllItems.length; ++i){ |
---|
573 | item = this._arrayOfAllItems[i]; |
---|
574 | for(key in item){ |
---|
575 | if(key !== this._rootItemPropName){ |
---|
576 | var value = item[key]; |
---|
577 | if(value !== null){ |
---|
578 | if(!lang.isArray(value)){ |
---|
579 | item[key] = [value]; |
---|
580 | } |
---|
581 | }else{ |
---|
582 | item[key] = [null]; |
---|
583 | } |
---|
584 | } |
---|
585 | allAttributeNames[key]=key; |
---|
586 | } |
---|
587 | } |
---|
588 | |
---|
589 | // Step 3: Build unique property names to use for the _storeRefPropName and _itemNumPropName |
---|
590 | // This should go really fast, it will generally never even run the loop. |
---|
591 | while(allAttributeNames[this._storeRefPropName]){ |
---|
592 | this._storeRefPropName += "_"; |
---|
593 | } |
---|
594 | while(allAttributeNames[this._itemNumPropName]){ |
---|
595 | this._itemNumPropName += "_"; |
---|
596 | } |
---|
597 | while(allAttributeNames[this._reverseRefMap]){ |
---|
598 | this._reverseRefMap += "_"; |
---|
599 | } |
---|
600 | |
---|
601 | // Step 4: Some data files specify an optional 'identifier', which is |
---|
602 | // the name of an attribute that holds the identity of each item. |
---|
603 | // If this data file specified an identifier attribute, then build a |
---|
604 | // hash table of items keyed by the identity of the items. |
---|
605 | var arrayOfValues; |
---|
606 | |
---|
607 | var identifier = dataObject.identifier; |
---|
608 | if(identifier){ |
---|
609 | this._itemsByIdentity = {}; |
---|
610 | this._features['dojo.data.api.Identity'] = identifier; |
---|
611 | for(i = 0; i < this._arrayOfAllItems.length; ++i){ |
---|
612 | item = this._arrayOfAllItems[i]; |
---|
613 | arrayOfValues = item[identifier]; |
---|
614 | var identity = arrayOfValues[0]; |
---|
615 | if(!Object.hasOwnProperty.call(this._itemsByIdentity, identity)){ |
---|
616 | this._itemsByIdentity[identity] = item; |
---|
617 | }else{ |
---|
618 | if(this._jsonFileUrl){ |
---|
619 | throw new Error("dojo.data.ItemFileReadStore: The json data as specified by: [" + this._jsonFileUrl + "] is malformed. Items within the list have identifier: [" + identifier + "]. Value collided: [" + identity + "]"); |
---|
620 | }else if(this._jsonData){ |
---|
621 | throw new Error("dojo.data.ItemFileReadStore: The json data provided by the creation arguments is malformed. Items within the list have identifier: [" + identifier + "]. Value collided: [" + identity + "]"); |
---|
622 | } |
---|
623 | } |
---|
624 | } |
---|
625 | }else{ |
---|
626 | this._features['dojo.data.api.Identity'] = Number; |
---|
627 | } |
---|
628 | |
---|
629 | // Step 5: Walk through all the items, and set each item's properties |
---|
630 | // for _storeRefPropName and _itemNumPropName, so that store.isItem() will return true. |
---|
631 | for(i = 0; i < this._arrayOfAllItems.length; ++i){ |
---|
632 | item = this._arrayOfAllItems[i]; |
---|
633 | item[this._storeRefPropName] = this; |
---|
634 | item[this._itemNumPropName] = i; |
---|
635 | } |
---|
636 | |
---|
637 | // Step 6: We walk through all the attribute values of all the items, |
---|
638 | // looking for type/value literals and item-references. |
---|
639 | // |
---|
640 | // We replace item-references with pointers to items. For example, we change: |
---|
641 | // { name:['Kermit'], friends:[{_reference:{name:'Miss Piggy'}}] } |
---|
642 | // into this: |
---|
643 | // { name:['Kermit'], friends:[miss_piggy] } |
---|
644 | // (where miss_piggy is the object representing the 'Miss Piggy' item). |
---|
645 | // |
---|
646 | // We replace type/value pairs with typed-literals. For example, we change: |
---|
647 | // { name:['Nelson Mandela'], born:[{_type:'Date', _value:'1918-07-18'}] } |
---|
648 | // into this: |
---|
649 | // { name:['Kermit'], born:(new Date(1918, 6, 18)) } |
---|
650 | // |
---|
651 | // We also generate the associate map for all items for the O(1) isItem function. |
---|
652 | for(i = 0; i < this._arrayOfAllItems.length; ++i){ |
---|
653 | item = this._arrayOfAllItems[i]; // example: { name:['Kermit'], friends:[{_reference:{name:'Miss Piggy'}}] } |
---|
654 | for(key in item){ |
---|
655 | arrayOfValues = item[key]; // example: [{_reference:{name:'Miss Piggy'}}] |
---|
656 | for(var j = 0; j < arrayOfValues.length; ++j){ |
---|
657 | value = arrayOfValues[j]; // example: {_reference:{name:'Miss Piggy'}} |
---|
658 | if(value !== null && typeof value == "object"){ |
---|
659 | if(("_type" in value) && ("_value" in value)){ |
---|
660 | var type = value._type; // examples: 'Date', 'Color', or 'ComplexNumber' |
---|
661 | var mappingObj = this._datatypeMap[type]; // examples: Date, dojo.Color, foo.math.ComplexNumber, {type: dojo.Color, deserialize(value){ return new dojo.Color(value)}} |
---|
662 | if(!mappingObj){ |
---|
663 | throw new Error("dojo.data.ItemFileReadStore: in the typeMap constructor arg, no object class was specified for the datatype '" + type + "'"); |
---|
664 | }else if(lang.isFunction(mappingObj)){ |
---|
665 | arrayOfValues[j] = new mappingObj(value._value); |
---|
666 | }else if(lang.isFunction(mappingObj.deserialize)){ |
---|
667 | arrayOfValues[j] = mappingObj.deserialize(value._value); |
---|
668 | }else{ |
---|
669 | throw new Error("dojo.data.ItemFileReadStore: Value provided in typeMap was neither a constructor, nor a an object with a deserialize function"); |
---|
670 | } |
---|
671 | } |
---|
672 | if(value._reference){ |
---|
673 | var referenceDescription = value._reference; // example: {name:'Miss Piggy'} |
---|
674 | if(!lang.isObject(referenceDescription)){ |
---|
675 | // example: 'Miss Piggy' |
---|
676 | // from an item like: { name:['Kermit'], friends:[{_reference:'Miss Piggy'}]} |
---|
677 | arrayOfValues[j] = this._getItemByIdentity(referenceDescription); |
---|
678 | }else{ |
---|
679 | // example: {name:'Miss Piggy'} |
---|
680 | // from an item like: { name:['Kermit'], friends:[{_reference:{name:'Miss Piggy'}}] } |
---|
681 | for(var k = 0; k < this._arrayOfAllItems.length; ++k){ |
---|
682 | var candidateItem = this._arrayOfAllItems[k], |
---|
683 | found = true; |
---|
684 | for(var refKey in referenceDescription){ |
---|
685 | if(candidateItem[refKey] != referenceDescription[refKey]){ |
---|
686 | found = false; |
---|
687 | } |
---|
688 | } |
---|
689 | if(found){ |
---|
690 | arrayOfValues[j] = candidateItem; |
---|
691 | } |
---|
692 | } |
---|
693 | } |
---|
694 | if(this.referenceIntegrity){ |
---|
695 | var refItem = arrayOfValues[j]; |
---|
696 | if(this.isItem(refItem)){ |
---|
697 | this._addReferenceToMap(refItem, item, key); |
---|
698 | } |
---|
699 | } |
---|
700 | }else if(this.isItem(value)){ |
---|
701 | //It's a child item (not one referenced through _reference). |
---|
702 | //We need to treat this as a referenced item, so it can be cleaned up |
---|
703 | //in a write store easily. |
---|
704 | if(this.referenceIntegrity){ |
---|
705 | this._addReferenceToMap(value, item, key); |
---|
706 | } |
---|
707 | } |
---|
708 | } |
---|
709 | } |
---|
710 | } |
---|
711 | } |
---|
712 | }, |
---|
713 | |
---|
714 | _addReferenceToMap: function(/*item*/ refItem, /*item*/ parentItem, /*string*/ attribute){ |
---|
715 | // summary: |
---|
716 | // Method to add an reference map entry for an item and attribute. |
---|
717 | // description: |
---|
718 | // Method to add an reference map entry for an item and attribute. // |
---|
719 | // refItem: |
---|
720 | // The item that is referenced. |
---|
721 | // parentItem: |
---|
722 | // The item that holds the new reference to refItem. |
---|
723 | // attribute: |
---|
724 | // The attribute on parentItem that contains the new reference. |
---|
725 | |
---|
726 | //Stub function, does nothing. Real processing is in ItemFileWriteStore. |
---|
727 | }, |
---|
728 | |
---|
729 | getIdentity: function(/* item */ item){ |
---|
730 | // summary: |
---|
731 | // See dojo.data.api.Identity.getIdentity() |
---|
732 | var identifier = this._features['dojo.data.api.Identity']; |
---|
733 | if(identifier === Number){ |
---|
734 | return item[this._itemNumPropName]; // Number |
---|
735 | }else{ |
---|
736 | var arrayOfValues = item[identifier]; |
---|
737 | if(arrayOfValues){ |
---|
738 | return arrayOfValues[0]; // Object || String |
---|
739 | } |
---|
740 | } |
---|
741 | return null; // null |
---|
742 | }, |
---|
743 | |
---|
744 | fetchItemByIdentity: function(/* Object */ keywordArgs){ |
---|
745 | // summary: |
---|
746 | // See dojo.data.api.Identity.fetchItemByIdentity() |
---|
747 | |
---|
748 | // Hasn't loaded yet, we have to trigger the load. |
---|
749 | var item, |
---|
750 | scope; |
---|
751 | if(!this._loadFinished){ |
---|
752 | var self = this; |
---|
753 | //Do a check on the JsonFileUrl and crosscheck it. |
---|
754 | //If it doesn't match the cross-check, it needs to be updated |
---|
755 | //This allows for either url or _jsonFileUrl to he changed to |
---|
756 | //reset the store load location. Done this way for backwards |
---|
757 | //compatibility. People use _jsonFileUrl (even though officially |
---|
758 | //private. |
---|
759 | if(this._jsonFileUrl !== this._ccUrl){ |
---|
760 | kernel.deprecated("dojo.data.ItemFileReadStore: ", |
---|
761 | "To change the url, set the url property of the store," + |
---|
762 | " not _jsonFileUrl. _jsonFileUrl support will be removed in 2.0"); |
---|
763 | this._ccUrl = this._jsonFileUrl; |
---|
764 | this.url = this._jsonFileUrl; |
---|
765 | }else if(this.url !== this._ccUrl){ |
---|
766 | this._jsonFileUrl = this.url; |
---|
767 | this._ccUrl = this.url; |
---|
768 | } |
---|
769 | |
---|
770 | //See if there was any forced reset of data. |
---|
771 | if(this.data != null && this._jsonData == null){ |
---|
772 | this._jsonData = this.data; |
---|
773 | this.data = null; |
---|
774 | } |
---|
775 | |
---|
776 | if(this._jsonFileUrl){ |
---|
777 | |
---|
778 | if(this._loadInProgress){ |
---|
779 | this._queuedFetches.push({args: keywordArgs}); |
---|
780 | }else{ |
---|
781 | this._loadInProgress = true; |
---|
782 | var getArgs = { |
---|
783 | url: self._jsonFileUrl, |
---|
784 | handleAs: "json-comment-optional", |
---|
785 | preventCache: this.urlPreventCache, |
---|
786 | failOk: this.failOk |
---|
787 | }; |
---|
788 | var getHandler = xhr.get(getArgs); |
---|
789 | getHandler.addCallback(function(data){ |
---|
790 | var scope = keywordArgs.scope?keywordArgs.scope:window.global; |
---|
791 | try{ |
---|
792 | self._getItemsFromLoadedData(data); |
---|
793 | self._loadFinished = true; |
---|
794 | self._loadInProgress = false; |
---|
795 | item = self._getItemByIdentity(keywordArgs.identity); |
---|
796 | if(keywordArgs.onItem){ |
---|
797 | keywordArgs.onItem.call(scope, item); |
---|
798 | } |
---|
799 | self._handleQueuedFetches(); |
---|
800 | }catch(error){ |
---|
801 | self._loadInProgress = false; |
---|
802 | if(keywordArgs.onError){ |
---|
803 | keywordArgs.onError.call(scope, error); |
---|
804 | } |
---|
805 | } |
---|
806 | }); |
---|
807 | getHandler.addErrback(function(error){ |
---|
808 | self._loadInProgress = false; |
---|
809 | if(keywordArgs.onError){ |
---|
810 | var scope = keywordArgs.scope?keywordArgs.scope:window.global; |
---|
811 | keywordArgs.onError.call(scope, error); |
---|
812 | } |
---|
813 | }); |
---|
814 | } |
---|
815 | |
---|
816 | }else if(this._jsonData){ |
---|
817 | // Passed in data, no need to xhr. |
---|
818 | self._getItemsFromLoadedData(self._jsonData); |
---|
819 | self._jsonData = null; |
---|
820 | self._loadFinished = true; |
---|
821 | item = self._getItemByIdentity(keywordArgs.identity); |
---|
822 | if(keywordArgs.onItem){ |
---|
823 | scope = keywordArgs.scope?keywordArgs.scope:window.global; |
---|
824 | keywordArgs.onItem.call(scope, item); |
---|
825 | } |
---|
826 | } |
---|
827 | }else{ |
---|
828 | // Already loaded. We can just look it up and call back. |
---|
829 | item = this._getItemByIdentity(keywordArgs.identity); |
---|
830 | if(keywordArgs.onItem){ |
---|
831 | scope = keywordArgs.scope?keywordArgs.scope:window.global; |
---|
832 | keywordArgs.onItem.call(scope, item); |
---|
833 | } |
---|
834 | } |
---|
835 | }, |
---|
836 | |
---|
837 | _getItemByIdentity: function(/* Object */ identity){ |
---|
838 | // summary: |
---|
839 | // Internal function to look an item up by its identity map. |
---|
840 | var item = null; |
---|
841 | if(this._itemsByIdentity){ |
---|
842 | // If this map is defined, we need to just try to get it. If it fails |
---|
843 | // the item does not exist. |
---|
844 | if(Object.hasOwnProperty.call(this._itemsByIdentity, identity)){ |
---|
845 | item = this._itemsByIdentity[identity]; |
---|
846 | } |
---|
847 | }else if (Object.hasOwnProperty.call(this._arrayOfAllItems, identity)){ |
---|
848 | item = this._arrayOfAllItems[identity]; |
---|
849 | } |
---|
850 | if(item === undefined){ |
---|
851 | item = null; |
---|
852 | } |
---|
853 | return item; // Object |
---|
854 | }, |
---|
855 | |
---|
856 | getIdentityAttributes: function(/* item */ item){ |
---|
857 | // summary: |
---|
858 | // See dojo.data.api.Identity.getIdentityAttributes() |
---|
859 | |
---|
860 | var identifier = this._features['dojo.data.api.Identity']; |
---|
861 | if(identifier === Number){ |
---|
862 | // If (identifier === Number) it means getIdentity() just returns |
---|
863 | // an integer item-number for each item. The dojo.data.api.Identity |
---|
864 | // spec says we need to return null if the identity is not composed |
---|
865 | // of attributes |
---|
866 | return null; // null |
---|
867 | }else{ |
---|
868 | return [identifier]; // Array |
---|
869 | } |
---|
870 | }, |
---|
871 | |
---|
872 | _forceLoad: function(){ |
---|
873 | // summary: |
---|
874 | // Internal function to force a load of the store if it hasn't occurred yet. This is required |
---|
875 | // for specific functions to work properly. |
---|
876 | var self = this; |
---|
877 | //Do a check on the JsonFileUrl and crosscheck it. |
---|
878 | //If it doesn't match the cross-check, it needs to be updated |
---|
879 | //This allows for either url or _jsonFileUrl to he changed to |
---|
880 | //reset the store load location. Done this way for backwards |
---|
881 | //compatibility. People use _jsonFileUrl (even though officially |
---|
882 | //private. |
---|
883 | if(this._jsonFileUrl !== this._ccUrl){ |
---|
884 | kernel.deprecated("dojo.data.ItemFileReadStore: ", |
---|
885 | "To change the url, set the url property of the store," + |
---|
886 | " not _jsonFileUrl. _jsonFileUrl support will be removed in 2.0"); |
---|
887 | this._ccUrl = this._jsonFileUrl; |
---|
888 | this.url = this._jsonFileUrl; |
---|
889 | }else if(this.url !== this._ccUrl){ |
---|
890 | this._jsonFileUrl = this.url; |
---|
891 | this._ccUrl = this.url; |
---|
892 | } |
---|
893 | |
---|
894 | //See if there was any forced reset of data. |
---|
895 | if(this.data != null){ |
---|
896 | this._jsonData = this.data; |
---|
897 | this.data = null; |
---|
898 | } |
---|
899 | |
---|
900 | if(this._jsonFileUrl){ |
---|
901 | var getArgs = { |
---|
902 | url: this._jsonFileUrl, |
---|
903 | handleAs: "json-comment-optional", |
---|
904 | preventCache: this.urlPreventCache, |
---|
905 | failOk: this.failOk, |
---|
906 | sync: true |
---|
907 | }; |
---|
908 | var getHandler = xhr.get(getArgs); |
---|
909 | getHandler.addCallback(function(data){ |
---|
910 | try{ |
---|
911 | //Check to be sure there wasn't another load going on concurrently |
---|
912 | //So we don't clobber data that comes in on it. If there is a load going on |
---|
913 | //then do not save this data. It will potentially clobber current data. |
---|
914 | //We mainly wanted to sync/wait here. |
---|
915 | //TODO: Revisit the loading scheme of this store to improve multi-initial |
---|
916 | //request handling. |
---|
917 | if(self._loadInProgress !== true && !self._loadFinished){ |
---|
918 | self._getItemsFromLoadedData(data); |
---|
919 | self._loadFinished = true; |
---|
920 | }else if(self._loadInProgress){ |
---|
921 | //Okay, we hit an error state we can't recover from. A forced load occurred |
---|
922 | //while an async load was occurring. Since we cannot block at this point, the best |
---|
923 | //that can be managed is to throw an error. |
---|
924 | throw new Error("dojo.data.ItemFileReadStore: Unable to perform a synchronous load, an async load is in progress."); |
---|
925 | } |
---|
926 | }catch(e){ |
---|
927 | console.log(e); |
---|
928 | throw e; |
---|
929 | } |
---|
930 | }); |
---|
931 | getHandler.addErrback(function(error){ |
---|
932 | throw error; |
---|
933 | }); |
---|
934 | }else if(this._jsonData){ |
---|
935 | self._getItemsFromLoadedData(self._jsonData); |
---|
936 | self._jsonData = null; |
---|
937 | self._loadFinished = true; |
---|
938 | } |
---|
939 | } |
---|
940 | }); |
---|
941 | //Mix in the simple fetch implementation to this class. |
---|
942 | lang.extend(ItemFileReadStore,simpleFetch); |
---|
943 | |
---|
944 | return ItemFileReadStore; |
---|
945 | }); |
---|