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384 lines
12 KiB
JavaScript
384 lines
12 KiB
JavaScript
dojo.provide("dojox.data.KeyValueStore");
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dojo.require("dojo.data.util.filter");
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dojo.require("dojo.data.util.simpleFetch");
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dojo.declare("dojox.data.KeyValueStore", null, {
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// summary:
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// This is a dojo.data store implementation. It can take in either a Javascript
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// array, JSON string, or URL as the data source. Data is expected to be in the
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// following format:
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// [
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// { "key1": "value1" },
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// { "key2": "value2" }
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// ]
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// This is to mimic the Java Properties file format. Each 'item' from this store
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// is a JS object representing a key-value pair. If an item in the above array has
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// more than one key/value pair, only the first will be used/accessed.
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constructor: function(/* Object */ keywordParameters){
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// summary: constructor
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// keywordParameters: {url: String}
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// keywordParameters: {data: string}
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// keywordParameters: {dataVar: jsonObject}
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if(keywordParameters.url){
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this.url = keywordParameters.url;
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}
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this._keyValueString = keywordParameters.data;
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this._keyValueVar = keywordParameters.dataVar;
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this._keyAttribute = "key";
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this._valueAttribute = "value";
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this._storeProp = "_keyValueStore";
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this._features = {
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'dojo.data.api.Read': true,
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'dojo.data.api.Identity': true
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};
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this._loadInProgress = false; //Got to track the initial load to prevent duelling loads of the dataset.
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this._queuedFetches = [];
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},
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url: "",
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data: "",
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_assertIsItem: function(/* item */ item){
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// summary:
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// This function tests whether the item passed in is indeed an item in the store.
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// item:
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// The item to test for being contained by the store.
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if(!this.isItem(item)){
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throw new Error("dojox.data.KeyValueStore: a function was passed an item argument that was not an item");
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}
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},
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_assertIsAttribute: function(/* item */ item, /* String */ attribute){
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// summary:
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// This function tests whether the item passed in is indeed a valid 'attribute' like type for the store.
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// attribute:
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// The attribute to test for being contained by the store.
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if(!dojo.isString(attribute)){
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throw new Error("dojox.data.KeyValueStore: a function was passed an attribute argument that was not an attribute object nor an attribute name string");
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}
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},
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/***************************************
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dojo.data.api.Read API
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***************************************/
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getValue: function( /* item */ item,
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/* attribute-name-string */ attribute,
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/* value? */ defaultValue){
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// summary:
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// See dojo.data.api.Read.getValue()
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this._assertIsItem(item);
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this._assertIsAttribute(item, attribute);
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var value;
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if(attribute == this._keyAttribute){ // Looking for key
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value = item[this._keyAttribute];
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}else{
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value = item[this._valueAttribute]; // Otherwise, attribute == ('value' || the actual key )
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}
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if(value === undefined){
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value = defaultValue;
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}
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return value;
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},
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getValues: function(/* item */ item,
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/* attribute-name-string */ attribute){
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// summary:
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// See dojo.data.api.Read.getValues()
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// Key/Value syntax does not support multi-valued attributes, so this is just a
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// wrapper function for getValue().
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var value = this.getValue(item, attribute);
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return (value ? [value] : []); //Array
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},
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getAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getAttributes()
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return [this._keyAttribute, this._valueAttribute, item[this._keyAttribute]];
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},
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hasAttribute: function( /* item */ item,
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/* attribute-name-string */ attribute){
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// summary:
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// See dojo.data.api.Read.hasAttribute()
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this._assertIsItem(item);
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this._assertIsAttribute(item, attribute);
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return (attribute == this._keyAttribute || attribute == this._valueAttribute || attribute == item[this._keyAttribute]);
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},
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containsValue: function(/* item */ item,
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/* attribute-name-string */ attribute,
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/* anything */ value){
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// summary:
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// See dojo.data.api.Read.containsValue()
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var regexp = undefined;
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if(typeof value === "string"){
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regexp = dojo.data.util.filter.patternToRegExp(value, false);
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}
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return this._containsValue(item, attribute, value, regexp); //boolean.
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},
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_containsValue: function( /* item */ item,
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/* attribute || attribute-name-string */ attribute,
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/* anything */ value,
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/* RegExp?*/ regexp){
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// summary:
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// Internal function for looking at the values contained by the item.
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// description:
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// Internal function for looking at the values contained by the item. This
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// function allows for denoting if the comparison should be case sensitive for
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// strings or not (for handling filtering cases where string case should not matter)
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//
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// item:
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// The data item to examine for attribute values.
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// attribute:
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// The attribute to inspect.
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// value:
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// The value to match.
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// regexp:
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// Optional regular expression generated off value if value was of string type to handle wildcarding.
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// If present and attribute values are string, then it can be used for comparison instead of 'value'
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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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var possibleValue = values[i];
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if(typeof possibleValue === "string" && regexp){
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return (possibleValue.match(regexp) !== null);
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}else{
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//Non-string matching.
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if(value === possibleValue){
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return true; // Boolean
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}
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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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// See dojo.data.api.Read.isItem()
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if (something && something[this._storeProp] === this) {
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return true; //Boolean
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}
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return false; //Boolean
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},
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isItemLoaded: function(/* anything */ something) {
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// summary:
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// See dojo.data.api.Read.isItemLoaded()
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// The KeyValueStore always loads all items, so if it's an item, then it's loaded.
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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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// See dojo.data.api.Read.loadItem()
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// description:
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// The KeyValueStore always loads all items, so if it's an item, then it's loaded.
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// From the dojo.data.api.Read.loadItem docs:
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// If a call to isItemLoaded() returns true before loadItem() is even called,
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// then loadItem() need not do any work at all and will not even invoke
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// the callback handlers.
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},
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getFeatures: function(){
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// summary:
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// See dojo.data.api.Read.getFeatures()
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return this._features; //Object
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},
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close: function(/*dojo.data.api.Request || keywordArgs || null */ request){
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// summary:
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// See dojo.data.api.Read.close()
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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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return item[this._keyAttribute];
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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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return [this._keyAttribute];
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},
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// The dojo.data.api.Read.fetch() function is implemented as
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// a mixin from dojo.data.util.simpleFetch.
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// That mixin requires us to define _fetchItems().
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_fetchItems: function( /* Object */ keywordArgs,
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/* Function */ findCallback,
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/* Function */ errorCallback){
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// summary:
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// See dojo.data.util.simpleFetch.fetch()
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var self = this;
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var filter = function(requestArgs, arrayOfAllItems){
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var items = null;
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if(requestArgs.query){
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items = [];
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var ignoreCase = requestArgs.queryOptions ? requestArgs.queryOptions.ignoreCase : false;
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//See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the
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//same value for each item examined. Much more efficient.
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var regexpList = {};
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for(var key in requestArgs.query){
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var value = requestArgs.query[key];
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if(typeof value === "string"){
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regexpList[key] = dojo.data.util.filter.patternToRegExp(value, ignoreCase);
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}
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}
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for(var i = 0; i < arrayOfAllItems.length; ++i){
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var match = true;
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var candidateItem = arrayOfAllItems[i];
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for(var key in requestArgs.query){
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var value = requestArgs.query[key];
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if(!self._containsValue(candidateItem, key, value, regexpList[key])){
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match = false;
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}
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}
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if(match){
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items.push(candidateItem);
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}
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}
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}else if(requestArgs.identity){
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items = [];
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var item;
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for(var key in arrayOfAllItems){
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item = arrayOfAllItems[key];
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if(item[self._keyAttribute] == requestArgs.identity){
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items.push(item);
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break;
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}
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}
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}else{
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// 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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// of the internal list so that multiple callers can get lists and sort without affecting each other.
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if(arrayOfAllItems.length> 0){
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items = arrayOfAllItems.slice(0,arrayOfAllItems.length);
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}
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}
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findCallback(items, requestArgs);
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};
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if(this._loadFinished){
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filter(keywordArgs, this._arrayOfAllItems);
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}else{
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if(this.url !== ""){
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//If fetches come in before the loading has finished, but while
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//a load is in progress, we have to defer the fetching to be
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//invoked in the callback.
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if(this._loadInProgress){
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this._queuedFetches.push({args: keywordArgs, filter: filter});
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}else{
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this._loadInProgress = true;
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var getArgs = {
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url: self.url,
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handleAs: "json-comment-filtered"
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};
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var getHandler = dojo.xhrGet(getArgs);
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getHandler.addCallback(function(data){
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self._processData(data);
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filter(keywordArgs, self._arrayOfAllItems);
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self._handleQueuedFetches();
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});
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getHandler.addErrback(function(error){
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self._loadInProgress = false;
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throw error;
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});
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}
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}else if(this._keyValueString){
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this._processData(eval(this._keyValueString));
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this._keyValueString = null;
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filter(keywordArgs, this._arrayOfAllItems);
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}else if(this._keyValueVar){
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this._processData(this._keyValueVar);
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this._keyValueVar = null;
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filter(keywordArgs, this._arrayOfAllItems);
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}else{
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throw new Error("dojox.data.KeyValueStore: No source data was provided as either URL, String, or Javascript variable data input.");
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}
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}
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},
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_handleQueuedFetches: function(){
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// summary:
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// Internal function to execute delayed request in the store.
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//Execute any deferred fetches now.
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if(this._queuedFetches.length > 0){
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for(var i = 0; i < this._queuedFetches.length; i++){
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var fData = this._queuedFetches[i];
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var delayedFilter = fData.filter;
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var delayedQuery = fData.args;
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if(delayedFilter){
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delayedFilter(delayedQuery, this._arrayOfAllItems);
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}else{
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this.fetchItemByIdentity(fData.args);
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}
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}
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this._queuedFetches = [];
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}
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},
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_processData: function(/* Array */ data){
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this._arrayOfAllItems = [];
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for(var i=0; i<data.length; i++){
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this._arrayOfAllItems.push(this._createItem(data[i]));
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}
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this._loadFinished = true;
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this._loadInProgress = false;
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},
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_createItem: function(/* Object */ something){
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var item = {};
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item[this._storeProp] = this;
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for(var i in something){
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item[this._keyAttribute] = i;
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item[this._valueAttribute] = something[i];
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break;
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}
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return item; //Object
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},
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/***************************************
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dojo.data.api.Identity API
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***************************************/
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getIdentity: function(/* item */ item){
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// summary:
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// See dojo.data.api.Identity.getIdentity()
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if(this.isItem(item)){
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return item[this._keyAttribute]; //String
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}
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return null; //null
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},
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getIdentityAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Identity.getIdentifierAttributes()
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return [this._keyAttribute];
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},
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fetchItemByIdentity: function(/* object */ keywordArgs){
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// summary:
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// See dojo.data.api.Identity.fetchItemByIdentity()
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keywordArgs.oldOnItem = keywordArgs.onItem;
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keywordArgs.onItem = null;
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keywordArgs.onComplete = this._finishFetchItemByIdentity ;
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this.fetch(keywordArgs);
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},
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_finishFetchItemByIdentity: function(/* Array */ items, /* object */ request) {
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var scope = request.scope || dojo.global;
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if(items.length){
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request.oldOnItem.call(scope, items[0]);
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}else{
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request.oldOnItem.call(scope, null);
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}
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}
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});
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//Mix in the simple fetch implementation to this class.
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dojo.extend(dojox.data.KeyValueStore,dojo.data.util.simpleFetch);
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