/*******************************************************************************
* Copyright (c) 2002, 2007 Innoopract Informationssysteme GmbH.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Innoopract Informationssysteme GmbH - initial API and implementation
******************************************************************************/
package org.eclipse.swt.internal.widgets;
import org.eclipse.rwt.SessionSingletonBase;
/**
* <p>Utility class to generate id's for widgets that are unique within a
* session.</p>
* <p>Note that this implementation is not synchronized. If multiple
* threads access methods of this class concurrently, they <i>must</i> be
* synchronized externally.
* </p>
*/
final class IdGenerator extends SessionSingletonBase {
/**
* <p>Returns the session-wide singleton instance of this class.</p>
*/
static IdGenerator getInstance() {
return ( IdGenerator )getInstance( IdGenerator.class );
}
private int lastId = 1;
private IdGenerator() {
// prevent instantiation from outside
}
/**
* <p>Returns a session-wide unique integer.</p>
*/
String newId() {
lastId++;
return new StringBuffer( "w" ).append( lastId ).toString();
}
}