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