| /******************************************************************************* |
| * 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; |
| } |
| } |