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/*******************************************************************************
* Copyright (c) 2006, 2009 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.ui.internal.selection;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.ui.IWindowListener;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
public class SelectionManagerFactory
{
private static volatile SelectionManagerFactory INSTANCE;
private static Object MUTEX = new Object();
/**
* Each <code>IWorkbenchWindow</code> has its own <code>JpaSelectionManager</code>
* to track the selection events in the <code>IWorkbenchWindow</code>. All
* <code>ISelectionListener</code>s in the same <code>IWorkbenchWindow</code>
* share the same <code>JpaSelectionManager</code>.
*
* @return The <code>JpaSelectionManager</code> associated with the current
* <code>IWorkbenchWindow</code>
*/
public static JpaSelectionManager getSelectionManager(IWorkbenchWindow window) {
if (INSTANCE == null) {
// this is thread safe for now. you never know whats comming
synchronized (MUTEX) {
if(INSTANCE == null) {
INSTANCE = new SelectionManagerFactory();
// if we do the init inside the constructor we end up in a loop
// because the addWindowListener(this) does a callback to us
INSTANCE.init();
}
}
}
return INSTANCE.internalGetSelectionManager(window);
}
Map<IWorkbenchWindow, DefaultJpaSelectionManager> managers;
private WindowListener windowListener;
private SelectionManagerFactory() {
managers = new HashMap<IWorkbenchWindow, DefaultJpaSelectionManager>();
windowListener = new WindowListener();
}
private void init() {
IWorkbench workbench = PlatformUI.getWorkbench();
workbench.addWindowListener(windowListener);
}
/**
* Returns the JpaSelectionManager for the IWorkbenchWindow.
* Creates a new one if none exists yet.
*/
DefaultJpaSelectionManager internalGetSelectionManager(IWorkbenchWindow window) {
if (window == null) {
throw new IllegalArgumentException("The IWorkbenchWindow cannot be null"); //$NON-NLS-1$
}
if (! managers.containsKey(window)) {
DefaultJpaSelectionManager manager = new DefaultJpaSelectionManager();
this.managers.put(window, manager);
manager.init(window);
}
return managers.get(window);
}
class WindowListener implements IWindowListener
{
public void windowOpened(IWorkbenchWindow aWindow) {
// do nothing
}
public void windowClosed(IWorkbenchWindow aWindow) {
DefaultJpaSelectionManager manager = internalGetSelectionManager(aWindow);
manager.dispose();
managers.remove(aWindow);
}
public void windowActivated(IWorkbenchWindow aWindow) {
// do nothing
}
public void windowDeactivated(IWorkbenchWindow aWindow) {
// do nothing
}
}
}
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