flymis/WebRoot/dojojs/src/data/Read.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.data.Read");
dojo.require("dojo.lang.declare");
dojo.require("dojo.data.Result");
dojo.require("dojo.experimental");

/* summary:
 *   This is an abstract API that data provider implementations conform to.  
 *   This file defines methods signatures and intentionally leaves all the
 *   methods unimplemented.
 */
dojo.experimental("dojo.data.Read");
 
dojo.declare("dojo.data.Read", null, {
	get:
		function(/* item */ item, /* attribute || attribute-name-string */ attribute, /* value? */ defaultValue) {
		/* summary:
		 *   Returns a single attribute value.
		 *   Returns defaultValue if item does not have a value for attribute.
		 *   Returns null if null was explicitly set as the attribute value.
		 *   Returns undefined if the item does not have a value for the given attribute.
		 *   (So, if store.hasAttribute(item, attribute) returns false, then
		 *   store.get(item, attribute) will return undefined.)
		 */
		 
		/* exceptions:
		 *   Conforming implementations should throw an exception if *item* is not
		 *   an item, or *attribute* is neither an attribute object or a string.
		 * examples:
		 *   var darthVader = store.get(lukeSkywalker, "father");
		 */
			dojo.unimplemented('dojo.data.Read.get');
			var attributeValue = null;
			return attributeValue; // a literal, an item, null, or undefined (never an array)
		},
	getValues:
		function(/* item */ item, /* attribute || attribute-name-string */ attribute) {
		/* summary:
		 *   This getValues() method works just like the get() method, but getValues()
		 *   always returns an array rather than a single attribute value.  The array
		 *   may be empty, may contain a single attribute value, or may contain many
		 *   attribute values.
		 *   If the item does not have a value for the given attribute, then getValues()
		 *   will return an empty array: [].  (So, if store.hasAttribute(item, attribute)
		 *   returns false, then store.getValues(item, attribute) will return [].)
		 */
		 
		/* exceptions:
		 *   Throws an exception if item is not an item, or attribute is neither an 
		 *   attribute object or a string.
		 * examples: