selectionaction.java

一个java写的business process management系统

/*
 * Copyright (c) 2003, Alexander Greif
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of the Flow4J-Eclipse project nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.orthanc.flow4j.designer.ui.actions;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IActionDelegate;

/**
 * Class SelectionAction TODO
 * @author agreif
 * 
 */
public abstract class SelectionAction implements IActionDelegate {

	private Class selectionType;
	private ISelection selection;

	/**
	 * Sets the selection type
	 * @param selectionType
	 */
	public SelectionAction(Class selectionType) {
		this.selectionType = selectionType;
	}

	/**
	 * Callback if the selection has changed
	 * @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
		this.selection = selection;
	}

	/**
	 * Runs the action
	 * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
	 */
	public void run(IAction action) {
		if (selection instanceof IStructuredSelection) {
			IStructuredSelection structSelection =
				(IStructuredSelection) selection;
			List selectedObjects = new ArrayList();
			for (Iterator iter = structSelection.iterator(); iter.hasNext();) {
				Object obj = (Object) iter.next();
				if (selectionType.isAssignableFrom(obj.getClass())) {
					selectedObjects.add(obj);
				} else if (obj instanceof IAdaptable) {
					IAdaptable adaptable = (IAdaptable) obj;
					Object adaptedObj = adaptable.getAdapter(selectionType);
					if (adaptedObj != null)
						selectedObjects.add(adaptedObj);
				}
			}

			run(action, selectedObjects);
		}
	}

	/**
	 * Runs the action for the selected objects
	 * @param action the action
	 * @param selectedObjects the selected objects
	 */
	public abstract void run(IAction action, List selectedObjects);

}