2.0/plugins/org.eclipse.epf.common.ui/src/org/eclipse/epf/common/ui/AbstractPlugin.java

//------------------------------------------------------------------------------
// Copyright (c) 2005, 2007 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 implementation
//------------------------------------------------------------------------------
package org.eclipse.epf.common.ui;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.epf.common.AbstractActivator;
import org.eclipse.epf.common.ui.util.MsgDialog;
import org.eclipse.swt.widgets.Display;

/**
 * The abstract base class for all EPF plug-ins.
 * 
 * @author Kelvin Low
 * @author Jinhua Xi
 * @since 1.0
 */
public abstract class AbstractPlugin extends AbstractActivator {

	// The message dialog hash map.
	private static Map<String, MsgDialog> msgDialogs = new HashMap<String, MsgDialog>();

	/**
	 * Default constructor.
	 */
	public AbstractPlugin() {
		super();
	}

	/**
	 * Returns the message dialog given the plug-in ID.
	 * 
	 * @return The new or cached message dialog.
	 */
	public MsgDialog getMsgDialog(AbstractActivator plugin) {
		MsgDialog msgDialog = (MsgDialog) msgDialogs.get(plugin.getId());
		if (msgDialog == null) {
			msgDialog = new MsgDialog(plugin, getWorkbench().getDisplay().getActiveShell());
			msgDialogs.put(plugin.getId(), msgDialog);
		}
		return msgDialog;
	}

	
	public MsgDialog getMsgDialog() {		
		MsgDialog msgDialog = (MsgDialog) msgDialogs.get(getId());
		if (msgDialog == null) {
			msgDialog = new MsgDialog(this);
			msgDialogs.put(getId(), msgDialog);
		}
		return msgDialog;
	}
	
	/**
	 * Returns the standard display to be used. The method first checks, if the
	 * thread calling this method has an associated disaply. If so, this display
	 * is returned. Otherwise the method returns the default display.
	 */
	public static Display getStandardDisplay() {
		Display display;
		display = Display.getCurrent();
		if (display == null)
			display = Display.getDefault();
		return display;
	}

}