removemusicfolderhandler.java

eclise rcp 项目,是非常好的学习源码

package com.siemens.ct.mp3m.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.handlers.HandlerUtil;

import com.siemens.ct.mp3m.ModelInitializer;
import com.siemens.ct.mp3m.model.physical.Mp3Directory;
import com.siemens.ct.mp3m.model.physical.MusicFolders;

/**
 * A handler to remove music folders
 * 
 * @see org.eclipse.core.commands.IHandler
 * @see org.eclipse.core.commands.AbstractHandler
 */
public class RemoveMusicFolderHandler extends AbstractHandler {
	public Object execute(ExecutionEvent event) throws ExecutionException {
		StructuredSelection structuredSelection = (StructuredSelection) HandlerUtil
				.getCurrentSelection(event);

		if (structuredSelection.getFirstElement() instanceof Mp3Directory) {
			Mp3Directory directory = (Mp3Directory) structuredSelection.getFirstElement();
			String folder = directory.getName();
			if (MusicFolders.contains(folder)) {
				MusicFolders.removeMusicFolder(folder);
				ModelInitializer.createTree();
			}
		}

		return null;
	}
}