538 lines
15 KiB
JavaScript
538 lines
15 KiB
JavaScript
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dojo.provide("dojox.data.AtomReadStore");
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dojo.require("dojo.data.util.simpleFetch");
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dojo.require("dojo.data.util.filter");
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dojo.require("dojo.date.stamp");
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dojo.experimental("dojox.data.AtomReadStore");
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dojo.declare("dojox.data.AtomReadStore", null, {
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// summary:
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// A read only data store for Atom XML based services or documents
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// description:
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// A data store for Atom XML based services or documents. This store is still under development
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// and doesn't support wildcard filtering yet. Attribute filtering is limited to category or id.
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constructor: function(/* object */ args) {
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// summary:
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// Constructor for the AtomRead store.
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// args:
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// An anonymous object to initialize properties. It expects the following values:
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// url: The url to a service or an XML document that represents the store
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// unescapeHTML: A boolean to specify whether or not to unescape HTML text
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// sendQuery: A boolean indicate to add a query string to the service URL
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if(args){
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this.url = args.url;
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this.rewriteUrl = args.rewriteUrl;
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this.label = args.label || this.label;
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this.sendQuery = (args.sendQuery || args.sendquery || this.sendQuery);
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this.unescapeHTML = args.unescapeHTML;
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}
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if(!this.url){
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throw new Error("AtomReadStore: a URL must be specified when creating the data store");
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}
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},
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//Values that may be set by the parser.
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//Ergo, have to be instantiated to something
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//So the parser knows how to set them.
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url: "",
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label: "title",
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sendQuery: false,
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unescapeHTML: false,
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/* dojo.data.api.Read */
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getValue: function(/* item */ item, /* attribute || attribute-name-string */ attribute, /* value? */ defaultValue){
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// summary:
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// Return an attribute value
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// description:
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// 'item' must be an instance of an object created by the AtomReadStore instance.
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// Accepted attributes are id, subtitle, title, summary, content, author, updated,
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// published, category, link and alternate
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// item:
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// An item returned by a call to the 'fetch' method.
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// attribute:
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// A attribute of the Atom Entry
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// defaultValue:
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// A default value
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// returns:
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// An attribute value found, otherwise 'defaultValue'
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this._assertIsItem(item);
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this._assertIsAttribute(attribute);
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this._initItem(item);
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attribute = attribute.toLowerCase();
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//If the attribute has previously been retrieved, then return it
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if(!item._attribs[attribute] && !item._parsed){
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this._parseItem(item);
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item._parsed = true;
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}
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var retVal = item._attribs[attribute];
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if(!retVal && attribute=="summary") {
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var content = this.getValue(item, "content");
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var regexp = new RegExp("/(<([^>]+)>)/g", "i");
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var text = content.text.replace(regexp,"");
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retVal = {
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text: text.substring(0, Math.min(400, text.length)),
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type: "text"
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};
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item._attribs[attribute] = retVal;
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}
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if(retVal && this.unescapeHTML){
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if ((attribute == "content" || attribute == "summary" || attribute == "subtitle") && !item["_"+attribute+"Escaped"]) {
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retVal.text = this._unescapeHTML(retVal.text);
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item["_"+attribute+"Escaped"] = true;
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}
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}
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return retVal ? dojo.isArray(retVal) ? retVal[0]: retVal : defaultValue;
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},
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getValues: function(/* item */ item, /* attribute || attribute-name-string */ attribute){
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// summary:
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// Return an attribute value
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// description:
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// 'item' must be an instance of an object created by the AtomReadStore instance.
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// Accepted attributes are id, subtitle, title, summary, content, author, updated,
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// published, category, link and alternate
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// item:
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// An item returned by a call to the 'fetch' method.
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// attribute:
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// A attribute of the Atom Entry
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// returns:
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// An array of values for the attribute value found, otherwise 'defaultValue'
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this._assertIsItem(item);
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this._assertIsAttribute(attribute);
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this._initItem(item);
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attribute = attribute.toLowerCase();
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//If the attribute has previously been retrieved, then return it
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if(!item._attribs[attribute]){
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this._parseItem(item);
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}
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var retVal = item._attribs[attribute];
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return retVal ? ((retVal.length !== undefined && typeof(retVal) !== "string") ? retVal : [retVal]) : undefined;
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},
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getAttributes: function(/* item */ item) {
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// summary:
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// Return an array of attribute names
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// description:
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// 'item' must be have been created by the AtomReadStore instance.
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// tag names of child elements and XML attribute names of attributes
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// specified to the element are returned along with special attribute
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// names applicable to the element including "tagName", "childNodes"
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// if the element has child elements, "text()" if the element has
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// child text nodes, and attribute names in '_attributeMap' that match
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// the tag name of the element.
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// item:
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// An XML element
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// returns:
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// An array of attributes found
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this._assertIsItem(item);
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if(!item._attribs){
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this._initItem(item);
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this._parseItem(item);
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}
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var attrNames = [];
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for(var x in item._attribs){
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attrNames.push(x);
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}
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return attrNames; //array
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},
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hasAttribute: function(/* item */ item, /* attribute || attribute-name-string */ attribute){
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// summary:
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// Check whether an element has the attribute
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// item:
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// 'item' must be created by the AtomReadStore instance.
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// attribute:
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// An attribute of an Atom Entry item.
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// returns:
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// True if the element has the attribute, otherwise false
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return (this.getValue(item, attribute) !== undefined); //boolean
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},
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containsValue: function(/* item */ item, /* attribute || attribute-name-string */ attribute, /* anything */ value){
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// summary:
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// Check whether the attribute values contain the value
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// item:
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// 'item' must be an instance of a dojox.data.XmlItem from the store instance.
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// attribute:
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// A tag name of a child element, An XML attribute name or one of
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// special names
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// returns:
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// True if the attribute values contain the value, otherwise false
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var values = this.getValues(item, attribute);
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for(var i = 0; i < values.length; i++){
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if((typeof value === "string")){
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if(values[i].toString && values[i].toString() === value){
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return true;
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}
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}else if (values[i] === value){
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return true; //boolean
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}
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}
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return false;//boolean
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},
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isItem: function(/* anything */ something){
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// summary:
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// Check whether the object is an item (XML element)
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// item:
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// An object to check
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// returns:
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// True if the object is an XML element, otherwise false
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if(something && something.element && something.store && something.store === this){
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return true; //boolean
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}
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return false; //boolran
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},
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isItemLoaded: function(/* anything */ something){
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// summary:
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// Check whether the object is an item (XML element) and loaded
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// item:
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// An object to check
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// returns:
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// True if the object is an XML element, otherwise false
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return this.isItem(something); //boolean
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},
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loadItem: function(/* object */ keywordArgs){
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// summary:
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// Load an item (XML element)
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// keywordArgs:
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// object containing the args for loadItem. See dojo.data.api.Read.loadItem()
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},
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getFeatures: function() {
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// summary:
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// Return supported data APIs
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// returns:
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// "dojo.data.api.Read" and "dojo.data.api.Write"
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var features = {
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"dojo.data.api.Read": true
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};
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return features; //array
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},
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getLabel: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabel()
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if((this.label !== "") && this.isItem(item)){
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var label = this.getValue(item,this.label);
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if(label && label.text){
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return label.text;
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}else if (label){
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return label.toString();
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}else{
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return undefined;
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}
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}
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return undefined; //undefined
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},
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getLabelAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabelAttributes()
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if(this.label !== ""){
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return [this.label]; //array
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}
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return null; //null
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},
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getFeedValue: function(attribute, defaultValue){
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// summary:
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// Non-API method for retrieving values regarding the Atom feed,
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// rather than the Atom entries.
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var values = this.getFeedValues(attribute, defaultValue);
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if(dojo.isArray(values)){
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return values[0];
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}
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return values;
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},
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getFeedValues: function(attribute, defaultValue){
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// summary:
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// Non-API method for retrieving values regarding the Atom feed,
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// rather than the Atom entries.
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if(!this.doc){
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return defaultValue;
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}
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if(!this._feedMetaData){
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this._feedMetaData = {
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element: this.doc.getElementsByTagName("feed")[0],
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store: this,
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_attribs: {}
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};
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this._parseItem(this._feedMetaData);
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}
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return this._feedMetaData._attribs[attribute] || defaultValue;
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},
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_initItem: function(item){
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// summary:
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// Initializes an item before it can be parsed.
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if(!item._attribs){
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item._attribs = {};
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}
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},
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_fetchItems: function(request, fetchHandler, errorHandler) {
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// summary:
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// Retrieves the items from the Atom XML document.
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var url = this._getFetchUrl(request);
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if(!url){
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errorHandler(new Error("No URL specified."));
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return;
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}
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var localRequest = (!this.sendQuery ? request : null); // use request for _getItems()
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var _this = this;
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var docHandler = function(data){
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_this.doc = data;
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var items = _this._getItems(data, localRequest);
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var query = request.query;
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if(query) {
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if(query.id) {
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items = dojo.filter(items, function(item){
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return (_this.getValue(item, "id") == query.id);
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});
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} else if(query.category){
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items = dojo.filter(items, function(entry) {
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var cats = _this.getValues(entry, "category");
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if(!cats){
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return false;
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}
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return dojo.some(cats, "return item.term=='"+query.category+"'");
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});
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}
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}
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if (items && items.length > 0) {
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fetchHandler(items, request);
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}
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else {
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fetchHandler([], request);
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}
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};
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if (this.doc) {
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docHandler(this.doc);
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}else{
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var getArgs = {
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url: url,
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handleAs: "xml"//,
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// preventCache: true
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};
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var getHandler = dojo.xhrGet(getArgs);
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getHandler.addCallback(docHandler);
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getHandler.addErrback(function(data){
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errorHandler(data, request);
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});
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}
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},
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_getFetchUrl: function(request){
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if(!this.sendQuery){
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return this.url;
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}
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var query = request.query;
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if(!query){
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return this.url;
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}
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if(dojo.isString(query)){
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return this.url + query;
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}
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var queryString = "";
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for(var name in query){
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var value = query[name];
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if(value){
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if(queryString){
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queryString += "&";
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}
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queryString += (name + "=" + value);
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}
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}
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if(!queryString){
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return this.url;
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}
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//Check to see if the URL already has query params or not.
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var fullUrl = this.url;
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if(fullUrl.indexOf("?") < 0){
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fullUrl += "?";
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}else{
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fullUrl += "&";
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}
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return fullUrl + queryString;
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},
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_getItems: function(document, request) {
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// summary:
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// Parses the document in a first pass
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if(this._items){
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return this._items;
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}
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var items = [];
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var nodes = [];
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if(document.childNodes.length < 1){
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this._items = items;
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console.log("dojox.data.AtomReadStore: Received an invalid Atom document. Check the content type header");
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return items;
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}
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var feedNodes = dojo.filter(document.childNodes, "return item.tagName && item.tagName.toLowerCase() == 'feed'");
|
||
|
|
|
||
|
|
var query = request.query;
|
||
|
|
|
||
|
|
if(!feedNodes || feedNodes.length != 1){
|
||
|
|
console.log("dojox.data.AtomReadStore: Received an invalid Atom document, number of feed tags = " + (feedNodes? feedNodes.length : 0));
|
||
|
|
return items;
|
||
|
|
}
|
||
|
|
|
||
|
|
nodes = dojo.filter(feedNodes[0].childNodes, "return item.tagName && item.tagName.toLowerCase() == 'entry'");
|
||
|
|
|
||
|
|
if(request.onBegin){
|
||
|
|
request.onBegin(nodes.length, this.sendQuery ? request : {});
|
||
|
|
}
|
||
|
|
|
||
|
|
for(var i = 0; i < nodes.length; i++){
|
||
|
|
var node = nodes[i];
|
||
|
|
if(node.nodeType != 1 /*ELEMENT_NODE*/){
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
items.push(this._getItem(node));
|
||
|
|
}
|
||
|
|
this._items = items;
|
||
|
|
return items;
|
||
|
|
},
|
||
|
|
|
||
|
|
close: function(/*dojo.data.api.Request || keywordArgs || null */ request){
|
||
|
|
// summary:
|
||
|
|
// See dojo.data.api.Read.close()
|
||
|
|
},
|
||
|
|
|
||
|
|
/* internal API */
|
||
|
|
|
||
|
|
_getItem: function(element){
|
||
|
|
return {
|
||
|
|
element: element,
|
||
|
|
store: this
|
||
|
|
};
|
||
|
|
},
|
||
|
|
|
||
|
|
_parseItem: function(item) {
|
||
|
|
var attribs = item._attribs;
|
||
|
|
var _this = this;
|
||
|
|
var text, type;
|
||
|
|
|
||
|
|
function getNodeText(node){
|
||
|
|
var txt = node.textContent || node.innerHTML || node.innerXML;
|
||
|
|
if(!txt && node.childNodes[0]){
|
||
|
|
var child = node.childNodes[0];
|
||
|
|
if (child && (child.nodeType == 3 || child.nodeType == 4)) {
|
||
|
|
txt = node.childNodes[0].nodeValue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return txt;
|
||
|
|
}
|
||
|
|
function parseTextAndType(node) {
|
||
|
|
return {text: getNodeText(node),type: node.getAttribute("type")};
|
||
|
|
}
|
||
|
|
dojo.forEach(item.element.childNodes, function(node){
|
||
|
|
var tagName = node.tagName ? node.tagName.toLowerCase() : "";
|
||
|
|
switch(tagName){
|
||
|
|
case "title":
|
||
|
|
attribs[tagName] = {
|
||
|
|
text: getNodeText(node),
|
||
|
|
type: node.getAttribute("type")
|
||
|
|
}; break;
|
||
|
|
case "subtitle":
|
||
|
|
case "summary":
|
||
|
|
case "content":
|
||
|
|
attribs[tagName] = parseTextAndType(node);
|
||
|
|
break;
|
||
|
|
case "author":
|
||
|
|
var nameNode ,uriNode;
|
||
|
|
dojo.forEach(node.childNodes, function(child){
|
||
|
|
if(!child.tagName){
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
switch(child.tagName.toLowerCase()){
|
||
|
|
case "name":nameNode = child;break;
|
||
|
|
case "uri": uriNode = child; break;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
var author = {};
|
||
|
|
if(nameNode && nameNode.length == 1){
|
||
|
|
author.name = getNodeText(nameNode[0]);
|
||
|
|
}
|
||
|
|
if(uriNode && uriNode.length == 1){
|
||
|
|
author.uri = getNodeText(uriNode[0]);
|
||
|
|
}
|
||
|
|
attribs[tagName] = author;
|
||
|
|
break;
|
||
|
|
case "id": attribs[tagName] = getNodeText(node); break;
|
||
|
|
case "updated": attribs[tagName] = dojo.date.stamp.fromISOString(getNodeText(node) );break;
|
||
|
|
case "published": attribs[tagName] = dojo.date.stamp.fromISOString(getNodeText(node));break;
|
||
|
|
case "category":
|
||
|
|
if(!attribs[tagName]){
|
||
|
|
attribs[tagName] = [];
|
||
|
|
}
|
||
|
|
attribs[tagName].push({scheme:node.getAttribute("scheme"), term: node.getAttribute("term")});
|
||
|
|
break;
|
||
|
|
case "link":
|
||
|
|
if(!attribs[tagName]){
|
||
|
|
attribs[tagName] = [];
|
||
|
|
}
|
||
|
|
var link = {
|
||
|
|
rel: node.getAttribute("rel"),
|
||
|
|
href: node.getAttribute("href"),
|
||
|
|
type: node.getAttribute("type")};
|
||
|
|
attribs[tagName].push(link);
|
||
|
|
|
||
|
|
if(link.rel == "alternate") {
|
||
|
|
attribs["alternate"] = link;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
},
|
||
|
|
|
||
|
|
_unescapeHTML : function(text) {
|
||
|
|
//Replace HTML character codes with their unencoded equivalents, e.g. ’ with '
|
||
|
|
text = text.replace(/’/m , "'").replace(/″/m , "\"").replace(/</m,">").replace(/>/m,"<").replace(/&/m,"&");
|
||
|
|
return text;
|
||
|
|
},
|
||
|
|
|
||
|
|
_assertIsItem: function(/* item */ item){
|
||
|
|
// summary:
|
||
|
|
// This function tests whether the item passed in is indeed an item in the store.
|
||
|
|
// item:
|
||
|
|
// The item to test for being contained by the store.
|
||
|
|
if(!this.isItem(item)){
|
||
|
|
throw new Error("dojox.data.AtomReadStore: Invalid item argument.");
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
_assertIsAttribute: function(/* attribute-name-string */ attribute){
|
||
|
|
// summary:
|
||
|
|
// This function tests whether the item passed in is indeed a valid 'attribute' like type for the store.
|
||
|
|
// attribute:
|
||
|
|
// The attribute to test for being contained by the store.
|
||
|
|
if(typeof attribute !== "string"){
|
||
|
|
throw new Error("dojox.data.AtomReadStore: Invalid attribute argument.");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
dojo.extend(dojox.data.AtomReadStore,dojo.data.util.simpleFetch);
|