EMAction.java

/*
 * ====================================================================
 * 
 * The ObjectStyle Group Software License, Version 1.0
 * 
 * Copyright (c) 2006 The ObjectStyle Group and individual authors of the
 * software. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if any, must
 * include the following acknowlegement: "This product includes software
 * developed by the ObjectStyle Group (http://objectstyle.org/)." Alternately,
 * this acknowlegement may appear in the software itself, if and wherever such
 * third-party acknowlegements normally appear.
 * 
 * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse or
 * promote products derived from this software without prior written permission.
 * For written permission, please contact andrus@objectstyle.org.
 * 
 * 5. Products derived from this software may not be called "ObjectStyle" nor
 * may "ObjectStyle" appear in their names without prior written permission of
 * the ObjectStyle Group.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * OBJECTSTYLE GROUP OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many individuals on
 * behalf of the ObjectStyle Group. For more information on the ObjectStyle
 * Group, please see <http://objectstyle.org/>.
 *  
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package org.objectstyle.wolips.eomodeler.actions;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Event;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.internal.Workbench;
import org.objectstyle.wolips.baseforuiplugins.utils.WorkbenchUtilities;

public abstract class EMAction extends Action implements IWorkbenchWindowActionDelegate, IObjectActionDelegate {
	private IWorkbenchWindow _window;
	private IStructuredSelection _selection;

	public EMAction() {
		// DO NOTHING
	}

	public void dispose() {
		// DO NOTHING
	}

	public void setActivePart(IAction action, IWorkbenchPart targetPart) {
 		_window = targetPart.getSite().getWorkbenchWindow();
	}

	public void init(IWorkbenchWindow window) {
		_window = window;
	}
	
	public IWorkbenchWindow getWindow() {
		if (_window == null) {
			_window = Workbench.getInstance().getActiveWorkbenchWindow();
		}
		return _window;
	}

	public void selectionChanged(IAction action, ISelection selection) {
		if (selection == null || selection.isEmpty()) {
			if (shouldClearEmptySelection()) {
				_selection = null;
			}
		}
		else if (selection instanceof IStructuredSelection && WorkbenchUtilities.shouldSaveSelection(getWindow())) {
			_selection = (IStructuredSelection)selection;
		}
	}

	protected boolean shouldClearEmptySelection() {
		return false;
	}

	public IStructuredSelection getSelection() {
		return _selection;
	}

	public void runWithEvent(Event _event) {
		run();
	}

	public void run(IAction _action) {
		run();
	}
	
	public Object getSelectedObject() {
		Object selectedObject = null;
		if (_selection != null) {
			selectedObject = _selection.getFirstElement();
		}
		return selectedObject;
	}

	public Object[] getSelectedObjects() {
		Object[] selectedObjects = null;
		if (_selection != null) {
			selectedObjects = _selection.toArray();
		}
		return selectedObjects;
	}
}