1 | define(["dojo/_base/declare", "dojo/_base/lang", "dojo/_base/xhr", "dojo/data/util/simpleFetch", "dojo/data/util/filter", |
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2 | "dojo/_base/kernel"], |
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3 | function(declare, lang, xhr, simpleFetch, filterUtil, kernel) { |
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4 | |
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5 | var OpmlStore = declare("dojox.data.OpmlStore", null, { |
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6 | // summary: |
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7 | // The OpmlStore implements the dojo/data/api/Read API. |
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8 | // examples: |
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9 | // | var opmlStore = new dojo.data.OpmlStore({url:"geography.xml"}); |
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10 | // | var opmlStore = new dojo.data.OpmlStore({url:"http://example.com/geography.xml"}); |
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11 | |
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12 | constructor: function(/* Object */ keywordParameters){ |
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13 | // summary: |
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14 | // constructor |
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15 | // keywordParameters: |
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16 | // - {url: String, label: String} |
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17 | // |
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18 | // Where label is optional and configures what should be used as the return from getLabel() |
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19 | this._xmlData = null; |
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20 | this._arrayOfTopLevelItems = []; |
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21 | this._arrayOfAllItems = []; |
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22 | this._metadataNodes = null; |
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23 | this._loadFinished = false; |
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24 | this.url = keywordParameters.url; |
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25 | this._opmlData = keywordParameters.data; // XML DOM Document |
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26 | if(keywordParameters.label){ |
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27 | this.label = keywordParameters.label; |
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28 | } |
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29 | this._loadInProgress = false; //Got to track the initial load to prevent duelling loads of the dataset. |
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30 | this._queuedFetches = []; |
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31 | this._identityMap = {}; |
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32 | this._identCount = 0; |
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33 | this._idProp = "_I"; |
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34 | if(keywordParameters && "urlPreventCache" in keywordParameters){ |
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35 | this.urlPreventCache = keywordParameters.urlPreventCache?true:false; |
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36 | } |
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37 | }, |
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38 | |
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39 | // label: [public] string |
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40 | // The attribute of the Opml item to act as a label. |
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41 | label: "text", |
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42 | |
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43 | // url: [public] string |
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44 | // The location from which to fetch the Opml document. |
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45 | url: "", |
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46 | |
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47 | // urlPreventCache: [public] boolean |
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48 | // Flag to denote if the underlying xhrGet call should set preventCache. |
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49 | urlPreventCache: false, |
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50 | |
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51 | _assertIsItem: function(/* item */ item){ |
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52 | if(!this.isItem(item)){ |
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53 | throw new Error("dojo.data.OpmlStore: a function was passed an item argument that was not an item"); |
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54 | } |
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55 | }, |
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56 | |
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57 | _assertIsAttribute: function(/*dojo/data/api/Item|String */ attribute){ |
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58 | // summary: |
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59 | // This function tests whether the item passed in is indeed a valid 'attribute' like type for the store. |
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60 | // attribute: |
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61 | // The attribute to test for being contained by the store. |
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62 | if(!lang.isString(attribute)){ |
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63 | throw new Error("dojox.data.OpmlStore: a function was passed an attribute argument that was not an attribute object nor an attribute name string"); |
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64 | } |
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65 | }, |
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66 | |
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67 | _removeChildNodesThatAreNotElementNodes: function(/* node */ node, /* boolean */ recursive){ |
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68 | var childNodes = node.childNodes; |
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69 | if(childNodes.length === 0){ |
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70 | return; |
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71 | } |
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72 | var nodesToRemove = []; |
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73 | var i, childNode; |
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74 | for(i = 0; i < childNodes.length; ++i){ |
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75 | childNode = childNodes[i]; |
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76 | if(childNode.nodeType != 1){ |
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77 | nodesToRemove.push(childNode); |
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78 | } |
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79 | } |
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80 | for(i = 0; i < nodesToRemove.length; ++i){ |
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81 | childNode = nodesToRemove[i]; |
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82 | node.removeChild(childNode); |
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83 | } |
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84 | if(recursive){ |
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85 | for(i = 0; i < childNodes.length; ++i){ |
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86 | childNode = childNodes[i]; |
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87 | this._removeChildNodesThatAreNotElementNodes(childNode, recursive); |
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88 | } |
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89 | } |
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90 | }, |
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91 | |
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92 | _processRawXmlTree: function(/* xmlDoc */ rawXmlTree){ |
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93 | this._loadFinished = true; |
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94 | this._xmlData = rawXmlTree; |
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95 | var headNodes = rawXmlTree.getElementsByTagName('head'); |
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96 | var headNode = headNodes[0]; |
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97 | if(headNode){ |
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98 | this._removeChildNodesThatAreNotElementNodes(headNode); |
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99 | this._metadataNodes = headNode.childNodes; |
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100 | } |
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101 | var bodyNodes = rawXmlTree.getElementsByTagName('body'); |
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102 | var bodyNode = bodyNodes[0]; |
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103 | if(bodyNode){ |
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104 | this._removeChildNodesThatAreNotElementNodes(bodyNode, true); |
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105 | |
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106 | var bodyChildNodes = bodyNodes[0].childNodes; |
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107 | for(var i = 0; i < bodyChildNodes.length; ++i){ |
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108 | var node = bodyChildNodes[i]; |
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109 | if(node.tagName == 'outline'){ |
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110 | this._identityMap[this._identCount] = node; |
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111 | this._identCount++; |
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112 | this._arrayOfTopLevelItems.push(node); |
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113 | this._arrayOfAllItems.push(node); |
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114 | this._checkChildNodes(node); |
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115 | } |
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116 | } |
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117 | } |
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118 | }, |
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119 | |
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120 | _checkChildNodes: function(node /*Node*/){ |
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121 | // summary: |
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122 | // Internal function to recurse over all child nodes from the store and add them |
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123 | // As non-toplevel items |
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124 | // description: |
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125 | // Internal function to recurse over all child nodes from the store and add them |
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126 | // As non-toplevel items |
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127 | // node: |
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128 | // The child node to walk. |
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129 | if(node.firstChild){ |
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130 | for(var i = 0; i < node.childNodes.length; i++){ |
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131 | var child = node.childNodes[i]; |
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132 | if(child.tagName == 'outline'){ |
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133 | this._identityMap[this._identCount] = child; |
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134 | this._identCount++; |
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135 | this._arrayOfAllItems.push(child); |
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136 | this._checkChildNodes(child); |
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137 | } |
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138 | } |
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139 | } |
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140 | }, |
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141 | |
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142 | _getItemsArray: function(/*object?*/queryOptions){ |
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143 | // summary: |
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144 | // Internal function to determine which list of items to search over. |
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145 | // queryOptions: The query options parameter, if any. |
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146 | if(queryOptions && queryOptions.deep){ |
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147 | return this._arrayOfAllItems; |
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148 | } |
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149 | return this._arrayOfTopLevelItems; |
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150 | }, |
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151 | |
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152 | /*************************************** |
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153 | dojo/data/api/Read API |
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154 | ***************************************/ |
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155 | getValue: function( /* item */ item, |
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156 | /* attribute|attribute-name-string */ attribute, |
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157 | /* value? */ defaultValue){ |
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158 | // summary: |
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159 | // See dojo/data/api/Read.getValue() |
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160 | this._assertIsItem(item); |
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161 | this._assertIsAttribute(attribute); |
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162 | if(attribute == 'children'){ |
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163 | return (item.firstChild || defaultValue); //Object |
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164 | }else{ |
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165 | var value = item.getAttribute(attribute); |
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166 | return (value !== undefined) ? value : defaultValue; //Object |
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167 | } |
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168 | }, |
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169 | |
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170 | getValues: function(/* item */ item, |
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171 | /* attribute|attribute-name-string */ attribute){ |
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172 | // summary: |
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173 | // See dojo/data/api/Read.getValues() |
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174 | this._assertIsItem(item); |
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175 | this._assertIsAttribute(attribute); |
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176 | var array = []; |
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177 | if(attribute == 'children'){ |
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178 | for(var i = 0; i < item.childNodes.length; ++i){ |
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179 | array.push(item.childNodes[i]); |
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180 | } |
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181 | } else if(item.getAttribute(attribute) !== null){ |
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182 | array.push(item.getAttribute(attribute)); |
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183 | } |
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184 | return array; // Array |
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185 | }, |
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186 | |
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187 | getAttributes: function(/* item */ item){ |
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188 | // summary: |
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189 | // See dojo/data/api/Read.getAttributes() |
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190 | this._assertIsItem(item); |
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191 | var attributes = []; |
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192 | var xmlNode = item; |
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193 | var xmlAttributes = xmlNode.attributes; |
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194 | for(var i = 0; i < xmlAttributes.length; ++i){ |
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195 | var xmlAttribute = xmlAttributes.item(i); |
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196 | attributes.push(xmlAttribute.nodeName); |
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197 | } |
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198 | if(xmlNode.childNodes.length > 0){ |
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199 | attributes.push('children'); |
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200 | } |
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201 | return attributes; //Array |
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202 | }, |
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203 | |
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204 | hasAttribute: function( /* item */ item, |
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205 | /* attribute|attribute-name-string */ attribute){ |
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206 | // summary: |
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207 | // See dojo/data/api/Read.hasAttribute() |
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208 | return (this.getValues(item, attribute).length > 0); //Boolean |
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209 | }, |
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210 | |
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211 | containsValue: function(/* item */ item, |
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212 | /* attribute|attribute-name-string */ attribute, |
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213 | /* anything */ value){ |
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214 | // summary: |
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215 | // See dojo/data/api/Read.containsValue() |
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216 | var regexp = undefined; |
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217 | if(typeof value === "string"){ |
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218 | regexp = filterUtil.patternToRegExp(value, false); |
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219 | } |
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220 | return this._containsValue(item, attribute, value, regexp); //boolean. |
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221 | }, |
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222 | |
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223 | _containsValue: function( /* item */ item, |
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224 | /* attribute|attribute-name-string */ attribute, |
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225 | /* anything */ value, |
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226 | /* RegExp?*/ regexp){ |
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227 | // summary: |
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228 | // Internal function for looking at the values contained by the item. |
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229 | // description: |
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230 | // Internal function for looking at the values contained by the item. This |
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231 | // function allows for denoting if the comparison should be case sensitive for |
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232 | // strings or not (for handling filtering cases where string case should not matter) |
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233 | // item: |
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234 | // The data item to examine for attribute values. |
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235 | // attribute: |
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236 | // The attribute to inspect. |
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237 | // value: |
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238 | // The value to match. |
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239 | // regexp: |
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240 | // Optional regular expression generated off value if value was of string type to handle wildcarding. |
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241 | // If present and attribute values are string, then it can be used for comparison instead of 'value' |
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242 | var values = this.getValues(item, attribute); |
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243 | for(var i = 0; i < values.length; ++i){ |
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244 | var possibleValue = values[i]; |
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245 | if(typeof possibleValue === "string" && regexp){ |
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246 | return (possibleValue.match(regexp) !== null); |
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247 | }else{ |
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248 | //Non-string matching. |
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249 | if(value === possibleValue){ |
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250 | return true; // Boolean |
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251 | } |
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252 | } |
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253 | } |
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254 | return false; // Boolean |
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255 | }, |
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256 | |
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257 | isItem: function(/* anything */ something){ |
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258 | // summary: |
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259 | // See dojo/data/api/Read.isItem() |
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260 | // description: |
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261 | // Four things are verified to ensure that "something" is an item: |
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262 | // something can not be null, the nodeType must be an XML Element, |
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263 | // the tagName must be "outline", and the node must be a member of |
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264 | // XML document for this datastore. |
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265 | return (something && |
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266 | something.nodeType == 1 && |
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267 | something.tagName == 'outline' && |
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268 | something.ownerDocument === this._xmlData); //Boolean |
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269 | }, |
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270 | |
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271 | isItemLoaded: function(/* anything */ something){ |
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272 | // summary: |
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273 | // See dojo/data/api/Read.isItemLoaded(). |
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274 | // OpmlStore loads every item, so if it's an item, then it's loaded. |
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275 | return this.isItem(something); //Boolean |
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276 | }, |
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277 | |
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278 | loadItem: function(/* item */ item){ |
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279 | // summary: |
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280 | // See dojo/data/api/Read.loadItem() |
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281 | // description: |
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282 | // The OpmlStore always loads all items, so if it's an item, then it's loaded. |
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283 | // |
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284 | // From the dojo/data/api/Read.loadItem docs: |
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285 | // |
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286 | // If a call to isItemLoaded() returns true before loadItem() is even called, |
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287 | // then loadItem() need not do any work at all and will not even invoke the callback handlers. |
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288 | }, |
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289 | |
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290 | getLabel: function(/* item */ item){ |
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291 | // summary: |
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292 | // See dojo/data/api/Read.getLabel() |
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293 | if(this.isItem(item)){ |
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294 | return this.getValue(item,this.label); //String |
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295 | } |
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296 | return undefined; //undefined |
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297 | }, |
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298 | |
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299 | getLabelAttributes: function(/* item */ item){ |
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300 | // summary: |
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301 | // See dojo/data/api/Read.getLabelAttributes() |
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302 | return [this.label]; //array |
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303 | }, |
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304 | |
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305 | // The dojo/data/api/Read.fetch() function is implemented as |
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306 | // a mixin from dojo.data.util.simpleFetch. |
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307 | // That mixin requires us to define _fetchItems(). |
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308 | _fetchItems: function( /* Object */ keywordArgs, |
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309 | /* Function */ findCallback, |
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310 | /* Function */ errorCallback){ |
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311 | // summary: |
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312 | // See dojo.data.util.simpleFetch.fetch() |
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313 | |
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314 | var self = this; |
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315 | var filter = function(requestArgs, arrayOfItems){ |
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316 | var items = null; |
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317 | if(requestArgs.query){ |
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318 | items = []; |
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319 | var ignoreCase = requestArgs.queryOptions ? requestArgs.queryOptions.ignoreCase : false; |
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320 | |
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321 | //See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the |
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322 | //same value for each item examined. Much more efficient. |
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323 | var regexpList = {}; |
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324 | for(var key in requestArgs.query){ |
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325 | var value = requestArgs.query[key]; |
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326 | if(typeof value === "string"){ |
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327 | regexpList[key] = filterUtil.patternToRegExp(value, ignoreCase); |
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328 | } |
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329 | } |
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330 | |
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331 | for(var i = 0; i < arrayOfItems.length; ++i){ |
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332 | var match = true; |
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333 | var candidateItem = arrayOfItems[i]; |
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334 | for(var key in requestArgs.query){ |
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335 | var value = requestArgs.query[key]; |
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336 | if(!self._containsValue(candidateItem, key, value, regexpList[key])){ |
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337 | match = false; |
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338 | } |
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339 | } |
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340 | if(match){ |
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341 | items.push(candidateItem); |
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342 | } |
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343 | } |
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344 | }else{ |
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345 | // We want a copy to pass back in case the parent wishes to sort the array. We shouldn't allow resort |
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346 | // of the internal list so that multiple callers can get lists and sort without affecting each other. |
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347 | if(arrayOfItems.length> 0){ |
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348 | items = arrayOfItems.slice(0,arrayOfItems.length); |
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349 | } |
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350 | } |
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351 | findCallback(items, requestArgs); |
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352 | }; |
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353 | |
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354 | if(this._loadFinished){ |
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355 | filter(keywordArgs, this._getItemsArray(keywordArgs.queryOptions)); |
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356 | }else{ |
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357 | |
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358 | //If fetches come in before the loading has finished, but while |
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359 | //a load is in progress, we have to defer the fetching to be |
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360 | //invoked in the callback. |
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361 | if(this._loadInProgress){ |
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362 | this._queuedFetches.push({args: keywordArgs, filter: filter}); |
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363 | }else{ |
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364 | if(this.url !== ""){ |
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365 | this._loadInProgress = true; |
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366 | var getArgs = { |
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367 | url: self.url, |
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368 | handleAs: "xml", |
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369 | preventCache: self.urlPreventCache |
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370 | }; |
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371 | var getHandler = xhr.get(getArgs); |
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372 | getHandler.addCallback(function(data){ |
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373 | self._processRawXmlTree(data); |
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374 | filter(keywordArgs, self._getItemsArray(keywordArgs.queryOptions)); |
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375 | self._handleQueuedFetches(); |
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376 | }); |
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377 | getHandler.addErrback(function(error){ |
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378 | throw error; |
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379 | }); |
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380 | }else if(this._opmlData){ |
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381 | this._processRawXmlTree(this._opmlData); |
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382 | this._opmlData = null; |
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383 | filter(keywordArgs, this._getItemsArray(keywordArgs.queryOptions)); |
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384 | }else{ |
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385 | throw new Error("dojox.data.OpmlStore: No OPML source data was provided as either URL or XML data input."); |
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386 | } |
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387 | } |
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388 | } |
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389 | }, |
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390 | |
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391 | getFeatures: function(){ |
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392 | // summary: |
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393 | // See dojo/data/api/Read.getFeatures() |
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394 | var features = { |
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395 | 'dojo.data.api.Read': true, |
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396 | 'dojo.data.api.Identity': true |
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397 | }; |
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398 | return features; //Object |
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399 | }, |
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400 | |
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401 | /*************************************** |
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402 | dojo/data/api/Identity API |
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403 | ***************************************/ |
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404 | getIdentity: function(/* item */ item){ |
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405 | // summary: |
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406 | // See dojo/data/api/Identity.getIdentity() |
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407 | if(this.isItem(item)){ |
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408 | //No other way to do this other than O(n) without |
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409 | //complete rework of how the tree stores nodes. |
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410 | for(var i in this._identityMap){ |
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411 | if(this._identityMap[i] === item){ |
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412 | return i; |
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413 | } |
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414 | } |
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415 | } |
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416 | return null; //null |
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417 | }, |
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418 | |
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419 | fetchItemByIdentity: function(/* Object */ keywordArgs){ |
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420 | // summary: |
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421 | // See dojo/data/api/Identity.fetchItemByIdentity() |
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422 | |
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423 | //Hasn't loaded yet, we have to trigger the load. |
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424 | if(!this._loadFinished){ |
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425 | var self = this; |
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426 | if(this.url !== ""){ |
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427 | //If fetches come in before the loading has finished, but while |
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428 | //a load is in progress, we have to defer the fetching to be |
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429 | //invoked in the callback. |
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430 | if(this._loadInProgress){ |
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431 | this._queuedFetches.push({args: keywordArgs}); |
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432 | }else{ |
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433 | this._loadInProgress = true; |
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434 | var getArgs = { |
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435 | url: self.url, |
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436 | handleAs: "xml" |
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437 | }; |
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438 | var getHandler = xhr.get(getArgs); |
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439 | getHandler.addCallback(function(data){ |
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440 | var scope = keywordArgs.scope ? keywordArgs.scope : kernel.global; |
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441 | try{ |
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442 | self._processRawXmlTree(data); |
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443 | var item = self._identityMap[keywordArgs.identity]; |
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444 | if(!self.isItem(item)){ |
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445 | item = null; |
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446 | } |
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447 | if(keywordArgs.onItem){ |
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448 | keywordArgs.onItem.call(scope, item); |
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449 | } |
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450 | self._handleQueuedFetches(); |
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451 | }catch(error){ |
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452 | if(keywordArgs.onError){ |
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453 | keywordArgs.onError.call(scope, error); |
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454 | } |
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455 | } |
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456 | }); |
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457 | getHandler.addErrback(function(error){ |
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458 | this._loadInProgress = false; |
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459 | if(keywordArgs.onError){ |
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460 | var scope = keywordArgs.scope ? keywordArgs.scope : kernel.global; |
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461 | keywordArgs.onError.call(scope, error); |
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462 | } |
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463 | }); |
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464 | } |
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465 | }else if(this._opmlData){ |
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466 | this._processRawXmlTree(this._opmlData); |
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467 | this._opmlData = null; |
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468 | var item = this._identityMap[keywordArgs.identity]; |
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469 | if(!self.isItem(item)){ |
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470 | item = null; |
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471 | } |
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472 | if(keywordArgs.onItem){ |
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473 | var scope = keywordArgs.scope ? keywordArgs.scope : kernel.global; |
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474 | keywordArgs.onItem.call(scope, item); |
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475 | } |
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476 | } |
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477 | }else{ |
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478 | //Already loaded. We can just look it up and call back. |
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479 | var item = this._identityMap[keywordArgs.identity]; |
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480 | if(!this.isItem(item)){ |
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481 | item = null; |
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482 | } |
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483 | if(keywordArgs.onItem){ |
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484 | var scope = keywordArgs.scope ? keywordArgs.scope : kernel.global; |
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485 | keywordArgs.onItem.call(scope, item); |
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486 | } |
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487 | } |
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488 | }, |
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489 | |
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490 | getIdentityAttributes: function(/* item */ item){ |
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491 | // summary: |
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492 | // See dojo/data/api/Identity.getIdentifierAttributes() |
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493 | |
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494 | //Identity isn't a public attribute in the item, it's the node count. |
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495 | //So, return null. |
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496 | return null; |
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497 | }, |
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498 | |
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499 | _handleQueuedFetches: function(){ |
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500 | // summary: |
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501 | // Internal function to execute delayed request in the store. |
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502 | |
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503 | //Execute any deferred fetches now. |
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504 | if(this._queuedFetches.length > 0){ |
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505 | for(var i = 0; i < this._queuedFetches.length; i++){ |
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506 | var fData = this._queuedFetches[i]; |
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507 | var delayedQuery = fData.args; |
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508 | var delayedFilter = fData.filter; |
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509 | if(delayedFilter){ |
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510 | delayedFilter(delayedQuery, this._getItemsArray(delayedQuery.queryOptions)); |
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511 | }else{ |
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512 | this.fetchItemByIdentity(delayedQuery); |
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513 | } |
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514 | } |
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515 | this._queuedFetches = []; |
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516 | } |
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517 | }, |
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518 | |
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519 | close: function(/*dojo/data/api/Request|Object?*/ request){ |
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520 | // summary: |
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521 | // See dojo/data/api/Read.close() |
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522 | } |
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523 | }); |
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524 | //Mix in the simple fetch implementation to this class. |
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525 | lang.extend(OpmlStore, simpleFetch); |
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526 | |
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527 | return OpmlStore; |
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528 | }); |
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529 | |
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