/*******************************************************************************
* Copyright (c) 2009 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*
*******************************************************************************/
package org.eclipse.wst.xml.core.internal.document;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import org.w3c.dom.Node;
/**
* Collects user data associated to a Node.
*
*/
final class UserData {
private static UserData fInstance;
/**
* Mapping of a Node to its User Data table (represented by a Map)
*/
private Map fData;
private UserData() {
fData = new WeakHashMap(0);
}
public static synchronized UserData getInstance() {
if (fInstance == null)
fInstance = new UserData();
return fInstance;
}
/**
* Get the user data table associated with <code>node</code>.
*
* @param node the node
* @return the user data table associated with the <code>node</code>
*/
public synchronized Map getUserDataTable(Node node) {
if (fData.containsKey(node))
return (Map) fData.get(node);
Map table = new HashMap();
fData.put(node, table);
return table;
}
}