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110 lines
4.3 KiB
JavaScript
110 lines
4.3 KiB
JavaScript
define("dojo/data/api/Identity", ["../../_base/declare", "./Read"], function(declare, Read){
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// module:
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// dojo/data/api/Identity
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return declare("dojo.data.api.Identity", Read, {
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// summary:
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// This is an abstract API that data provider implementations conform to.
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// This file defines methods signatures and intentionally leaves all the
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// methods unimplemented.
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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 {
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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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},
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getIdentity: function(/* dojo/data/api/Item */ item){
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// summary:
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// Returns a unique identifier for an item. The return value will be
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// either a string or something that has a toString() method (such as,
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// for example, a dojox/uuid object).
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// item:
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// The item from the store from which to obtain its identifier.
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// exceptions:
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// Conforming implementations may throw an exception or return null if
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// item is not an item.
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// example:
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// | var itemId = store.getIdentity(kermit);
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// | assert(kermit === store.findByIdentity(store.getIdentity(kermit)));
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throw new Error('Unimplemented API: dojo.data.api.Identity.getIdentity');
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},
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getIdentityAttributes: function(/* dojo/data/api/Item */ item){
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// summary:
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// Returns an array of attribute names that are used to generate the identity.
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// For most stores, this is a single attribute, but for some complex stores
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// such as RDB backed stores that use compound (multi-attribute) identifiers
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// it can be more than one. If the identity is not composed of attributes
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// on the item, it will return null. This function is intended to identify
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// the attributes that comprise the identity so that so that during a render
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// of all attributes, the UI can hide the the identity information if it
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// chooses.
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// item:
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// The item from the store from which to obtain the array of public attributes that
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// compose the identifier, if any.
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// example:
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// | var itemId = store.getIdentity(kermit);
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// | var identifiers = store.getIdentityAttributes(itemId);
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// | assert(typeof identifiers === "array" || identifiers === null);
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throw new Error('Unimplemented API: dojo.data.api.Identity.getIdentityAttributes');
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},
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fetchItemByIdentity: function(/* object */ keywordArgs){
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// summary:
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// Given the identity of an item, this method returns the item that has
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// that identity through the onItem callback. Conforming implementations
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// should return null if there is no item with the given identity.
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// Implementations of fetchItemByIdentity() may sometimes return an item
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// from a local cache and may sometimes fetch an item from a remote server,
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// keywordArgs:
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// An anonymous object that defines the item to locate and callbacks to invoke when the
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// item has been located and load has completed. The format of the object is as follows:
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// | {
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// | identity: string|object,
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// | onItem: Function,
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// | onError: Function,
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// | scope: object
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// | }
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//
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// ####The *identity* parameter
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//
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// The identity parameter is the identity of the item you wish to locate and load
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// This attribute is required. It should be a string or an object that toString()
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// can be called on.
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//
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// ####The *onItem* parameter
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//
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// Function(item)
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// The onItem parameter is the callback to invoke when the item has been loaded. It takes only one
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// parameter, the item located, or null if none found.
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//
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// ####The *onError* parameter
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//
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// Function(error)
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// The onError parameter is the callback to invoke when the item load encountered an error. It takes only one
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// parameter, the error object
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//
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// ####The *scope* parameter
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//
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// If a scope object is provided, all of the callback functions (onItem,
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// onError, etc) will be invoked in the context of the scope object.
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// In the body of the callback function, the value of the "this"
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// keyword will be the scope object. If no scope object is provided,
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// the callback functions will be called in the context of dojo.global.
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// For example, onItem.call(scope, item, request) vs.
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// onItem.call(dojo.global, item, request)
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if(!this.isItemLoaded(keywordArgs.item)){
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throw new Error('Unimplemented API: dojo.data.api.Identity.fetchItemByIdentity');
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}
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}
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});
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});
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