flymis/WebRoot/dojojs/src/data/old/provider/Base.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.old.provider.Base");
dojo.require("dojo.lang.assert");

// -------------------------------------------------------------------
// Constructor
// -------------------------------------------------------------------
dojo.data.old.provider.Base = function() {
	/**
	 * summary:
	 * A Data Provider serves as a connection to some data source,
	 * like a relational database.  This data provider Base class
	 * serves as an abstract superclass for other data provider
	 * classes.
	 */
	this._countOfNestedTransactions = 0;
	this._changesInCurrentTransaction = null;
};

// -------------------------------------------------------------------
// Public instance methods
// -------------------------------------------------------------------
dojo.data.old.provider.Base.prototype.beginTransaction = function() {
	/**
	 * Marks the beginning of a transaction.
	 *
	 * Each time you call beginTransaction() you open a new transaction, 
	 * which you need to close later using endTransaction().  Transactions
	 * may be nested, but the beginTransaction and endTransaction calls
	 * always need to come in pairs.
	 */
	if (this._countOfNestedTransactions === 0) {
		this._changesInCurrentTransaction = [];
	}
	this._countOfNestedTransactions += 1;
};

dojo.data.old.provider.Base.prototype.endTransaction = function() {
	/**
	 * Marks the end of a transaction.
	 */
	this._countOfNestedTransactions -= 1;
	dojo.lang.assert(this._countOfNestedTransactions >= 0);

	if (this._countOfNestedTransactions === 0) {
		var listOfChangesMade = this._saveChanges();
		this._changesInCurrentTransaction = null;
		if (listOfChangesMade.length > 0) {
			// dojo.debug("endTransaction: " + listOfChangesMade.length + " changes made");
			this._notifyObserversOfChanges(listOfChangesMade);
		}