/*******************************************************************************
 * Copyright (c) 2003, 2004 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 API and implementation
 *******************************************************************************/ 
package org.eclipse.jst.j2ee.internal.webservice;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jst.j2ee.internal.webservice.plugin.WebServicePlugin;

public class NewProjectsListener implements IResourceChangeListener, IResourceDeltaVisitor  {

	
	private WebServiceViewerSynchronization synchronization;
	private boolean listening = false;
	private boolean synchronizing = false;

	public NewProjectsListener(WebServiceViewerSynchronization sync) {
		synchronization = sync;
		if(synchronization.webServiceProjectsExist(new NullProgressMonitor())) {
			synchronizing = true;
			synchronization.start();
		}
		startListening();
	} 
	
	public void dispose() {
		if(listening)
			stopListening();
		if(synchronizing)
			synchronization.stop();
	}
	
	public void resourceChanged(IResourceChangeEvent event) {
		try {
			event.getDelta().accept(this);
		} catch (CoreException e) {
			WebServicePlugin.logError(0, e.getMessage(), e);
		} 
	} 

	public boolean visit(IResourceDelta delta) throws CoreException { 
		
		IResource resource = delta.getResource();
		switch (resource.getType()) {
			case IResource.ROOT :
				return true;
			case IResource.PROJECT: 
				if(delta.getKind() == IResourceDelta.ADDED) {
					if(WebServiceViewerSynchronization.isInteresting((IProject)resource)) {
						stopListening();
						synchronizing = true;
						synchronization.start();
					}
				}

			default :
				break;
		}
		
		return false;
	}

	private void startListening() {
		ResourcesPlugin.getWorkspace().addResourceChangeListener(this, IResourceChangeEvent.POST_CHANGE);
		listening = true;
	}

	private void stopListening() {
		ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
		listening = false;
	}
}