source: Dev/branches/rest-dojo-ui/client/dojox/dtl/contrib/data.js @ 256

define([
        "dojo/_base/kernel",
        "dojo/_base/lang",
        "../_base",
        "dojo/_base/array"
], function(kernel,lang,dd,array){
        /*=====
                dd = dojox.dtl;
        =====*/
        lang.getObject("dojox.dtl.contrib.data", true);

        var ddcd = dd.contrib.data;
        var first = true;

        ddcd._BoundItem = lang.extend(function(item, store){
                this.item = item;
                this.store = store;
        },
        {
                get: function(key){
                        var store = this.store;
                        var item = this.item;

                        if(key == "getLabel"){
                                return store.getLabel(item);
                        }else if(key == "getAttributes"){
                                return store.getAttributes(item);
                        }else if(key == "getIdentity"){
                                if(store.getIdentity){
                                        return store.getIdentity(item);
                                }
                                return "Store has no identity API";
                        }else{
                                if(!store.hasAttribute(item, key)){
                                        if(key.slice(-1) == "s"){
                                                if(first){
                                                        first = false;
                                                        kernel.deprecated("You no longer need an extra s to call getValues, it can be figured out automatically");
                                                }
                                                key = key.slice(0, -1);
                                        }
                                        if(!store.hasAttribute(item, key)){
                                                return;
                                        }
                                }

                                var values = store.getValues(item, key);
                                if(!values){
                                        return;
                                }
                                if(!lang.isArray(values)){
                                        return new ddcd._BoundItem(values, store);
                                }

                                values = array.map(values, function(value){
                                        if(lang.isObject(value) && store.isItem(value)){
                                                return new ddcd._BoundItem(value, store);
                                        }
                                        return value;
                                });
                                values.get = ddcd._get;
                                return values;
                        }
                }
        });
        ddcd._BoundItem.prototype.get.safe = true;

        ddcd.BindDataNode = lang.extend(function(items, query, store, alias){
                this.items = items && new dd._Filter(items);
                this.query = query && new dd._Filter(query);
                this.store = new dd._Filter(store);
                this.alias = alias;
        },
        {
                render: function(context, buffer){
                        var items = this.items && this.items.resolve(context);
                        var query = this.query && this.query.resolve(context);
                        var store = this.store.resolve(context);
                        if(!store || !store.getFeatures){
                                throw new Error("data_bind didn't receive a store");
                        }

                        if(query){
                                var sync = false;

                                store.fetch({
                                        query: query,
                                        sync: true,
                                        scope: this,
                                        onComplete: function(it){
                                                sync = true;
                                                items = it;
                                        }
                                });

                                if(!sync){
                                        throw new Error("The bind_data tag only works with a query if the store executed synchronously");
                                }
                        }

                        var list = [];

                        if(items){
                                for(var i = 0, item; item = items[i]; i++){
                                        list.push(new ddcd._BoundItem(item, store));
                                }
                        }

                        context[this.alias] = list;
                        return buffer;
                },
                unrender: function(context, buffer){
                        return buffer;
                },
                clone: function(){
                        return this;
                }
        });

        lang.mixin(ddcd, {
                _get: function(key){
                        if(this.length){
                                return (this[0] instanceof ddcd._BoundItem) ? this[0].get(key) : this[0][key];
                        }
                },
                bind_data: function(parser, token){
                        // summary: Turns a list of data store items into DTL compatible items
                        // example:
                        //      `contextItems` and `contextStore` should be an item list
                        //      and a data store that get assigned to `newVariable`
                        //
                        //      |       {% bind_data contextItems to contextStore as newVariable %}
                        var parts = token.contents.split();

                        if(parts[2] != 'to' || parts[4] != 'as' || !parts[5]){
                                throw new Error("data_bind expects the format: 'data_bind items to store as varName'");
                        }

                        return new ddcd.BindDataNode(parts[1], null, parts[3], parts[5]);
                },
                bind_query: function(parser, token){
                        // summary: Queries a data store and makes the returned items DTL compatible
                        // example:
                        //      You can only use this with data stores that work in a synchronous
                        //      way (meaning that `onComplete` is fired during the `fetch` call).
                        //      A `sync` flag is sent to the fetch call so that stores that usually
                        //      work asynchronously make themselves syncrhonous if possible.
                        //      |       {% bind_query contextQuery to contextStore as newVariable %}
                        var parts = token.contents.split();

                        if(parts[2] != 'to' || parts[4] != 'as' || !parts[5]){
                                throw new Error("data_bind expects the format: 'bind_query query to store as varName'");
                        }

                        return new ddcd.BindDataNode(null, parts[1], parts[3], parts[5]);
                }
        });
        ddcd._get.safe = true;

        dd.register.tags("dojox.dtl.contrib", {
                "data": ["bind_data", "bind_query"]
        });
        return dojox.dtl.contrib.data;
});