plugins/org.eclipse.mylyn.docs.intent.client.ui.ide/src/org/eclipse/mylyn/docs/intent/client/ui/ide/builder/IntentBuilderDeltaVisitor.java

/*******************************************************************************
 * Copyright (c) 2010, 2011 Obeo.


 * 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:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.mylyn.docs.intent.client.ui.ide.builder;

import com.google.common.collect.Sets;

import java.util.Set;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.mylyn.docs.intent.collab.common.repository.IntentRepositoryManager;

/**
 * Visitor used by the Intent builder.
 * 
 * @author <a href="mailto:alex.lagarde@obeo.fr">Alex Lagarde</a>
 * @author <a href="mailto:william.piers@obeo.fr">William Piers</a>
 */
class IntentBuilderDeltaVisitor implements IResourceDeltaVisitor {
	/**
	 * Collection of projects that just have been opened/created.
	 */
	private Set<IProject> openedProjects = Sets.newHashSet();

	/**
	 * Collection of projects that just have been closed/deleted.
	 */
	private Set<IProject> closedProjects = Sets.newHashSet();

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.core.resources.IResourceDeltaVisitor#visit(org.eclipse.core.resources.IResourceDelta)
	 */
	public boolean visit(IResourceDelta delta) throws CoreException {
		IResource resource = delta.getResource();
		switch (delta.getKind()) {
			case IResourceDelta.ADDED:
				// If an intent project has been created
				// Then a new repository will be created and the
				// IntentProjectBasedRepositoryManagerContribution will trigger project connexion
				break;
			case IResourceDelta.CHANGED:
				if ((IResourceDelta.OPEN & delta.getFlags()) != 0) {
					if (resource instanceof IProject && resource.isAccessible()
							&& ((IProject)resource).hasNature(IntentNature.NATURE_ID)) {
						if (((IProject)resource).isOpen()) {
							openedProjects.add((IProject)resource);
						}
					}
				}
				// If the Nature of a project has changed
				if ((IResourceDelta.DESCRIPTION & delta.getFlags()) != 0) {
					if (resource instanceof IProject) {
						// If the Intent Nature has been added
						if (resource.isAccessible() && ((IProject)resource).hasNature(IntentNature.NATURE_ID)) {
							openedProjects.add((IProject)resource);
						} else {
							// If the project had the Intent Nature but not anymore
							if (IntentRepositoryManager.INSTANCE.isManagedProject(resource.getName())) {
								closedProjects.add((IProject)resource);
							}
						}
					}
				}
				break;
			default:
				break;
		}
		// return true to continue visiting children.
		return true;
	}

	/**
	 * Returns the projects that just have been opened.
	 * 
	 * @return the projects that just have been opened
	 */
	public Set<IProject> getOpenedProjects() {
		return openedProjects;
	}

	/**
	 * Returns the projects that just have been closed.
	 * 
	 * @return the projects that just have been closed
	 */
	public Set<IProject> getClosedProjects() {
		return closedProjects;
	}
}