/*******************************************************************************
 * Copyright (c) 2006-2012
 * Software Technology Group, Dresden University of Technology
 * DevBoost GmbH, Berlin, Amtsgericht Charlottenburg, HRB 140026
 * 
 * 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:
 *   Software Technology Group - TU Dresden, Germany;
 *   DevBoost GmbH - Berlin, Germany
 *      - initial API and implementation
 ******************************************************************************/
package org.reuseware.sokan.resource.build;

import java.util.Collections;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.reuseware.sokan.index.SokanIndexPlugin;
import org.reuseware.sokan.index.util.StoreUtil;

/**
 * A resource change listener that reacts on the opening of projects
 * that registers the stores of a newly opened project with the index and
 * runs the full indexing of the project.
 */
public class ProjectOpenListener implements IResourceChangeListener {

	private final StoreUtil storeUtil = StoreUtil.INSTANCE;
	
	/**
	 * Checks if the event is a post-project-open event and
	 * runs the indexing of the project if that is the case.
	 * 
	 * @param event the resource change event
	 */
	public void resourceChanged(IResourceChangeEvent event) {
		if (event.getType() == IResourceChangeEvent.POST_CHANGE) {
			IResourceDelta delta = event.getDelta();

			//get deltas for the projects
			IResourceDelta[] projectDeltas = delta.getAffectedChildren();
			for (int i = 0; i < projectDeltas.length; i++) {
				int kind = projectDeltas[i].getKind();
				int flags = projectDeltas[i].getFlags();
				
				if (kind == IResourceDelta.CHANGED
						&& (flags & IResourceDelta.OPEN) == IResourceDelta.OPEN 
						&& projectDeltas[i].getResource() instanceof IProject) {
					final IProject project = (IProject) projectDeltas[i].getResource();
					
					if (project.isOpen()) {
						Job job = new Job("indexing") {
							@Override
							protected IStatus run(IProgressMonitor monitor) {
								try {
									//find and remember stores in project
									storeUtil.getWorkspaceStores().addAll(
											storeUtil.getAllStores(project));
									project.build(
											IndexBuilder.FULL_BUILD, 
											IndexBuilder.BUILDER_ID,
											Collections.<String,String>emptyMap(), monitor);
								} catch (CoreException e) {
									SokanIndexPlugin.logError("", e);
								}
								return Status.OK_STATUS;
							}
						};
						job.setPriority(Job.BUILD);
						job.schedule();
					}
				}
			}
		}
	}
}