org.eclipse.egf.pattern/src/org/eclipse/egf/pattern/ecore/EPackageListener.java

/**
 * <copyright>
 * 
 * Copyright (c) 2009-2010 Thales Corporate Services S.A.S.
 * 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:
 * Thales Corporate Services S.A.S - initial API and implementation
 * 
 * </copyright>
 */

package org.eclipse.egf.pattern.ecore;

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.runtime.CoreException;
import org.eclipse.egf.pattern.Activator;
import org.eclipse.egf.pattern.ecore.EPackageHelper.RegistrationException;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;

/**
 * TODO: fix issue when a XXXPackage class is removed.
 * 
 * @author Thomas Guiu
 * 
 */
public class EPackageListener implements IResourceChangeListener {

    private static final String RESOURCE_SUFFIX = "Package.java";

    private final class ResourceDeltaVisitor implements IResourceDeltaVisitor {
        public boolean visit(IResourceDelta delta) throws CoreException {
            IResource resource = delta.getResource();
            if (resource.getType() == IResource.FILE && resource.getName().endsWith(RESOURCE_SUFFIX)) {
                IProject project = resource.getProject();
                ICompilationUnit unit = (ICompilationUnit) JavaCore.create(resource);
                IType type = unit.findPrimaryType();
                if (type == null || !type.getField(EPackageHelper.INSTANCE_FIELD_NAME).exists())
                    return false;

                String fullyQualifiedName = type.getFullyQualifiedName();
                try {
                    switch (delta.getKind()) {
                    case IResourceDelta.ADDED:
                    case IResourceDelta.ADDED_PHANTOM:
                    case IResourceDelta.CHANGED:
                        EPackageHelper.registerPackage(project, fullyQualifiedName);
                        break;
                    case IResourceDelta.REMOVED:
                    case IResourceDelta.REMOVED_PHANTOM:
                        EPackageHelper.unregisterPackage(project, fullyQualifiedName);
                        break;
                    }
                } catch (RegistrationException e) {
                    Activator.getDefault().logWarning(e);
                }
                return false;
            }
            return true;
        }
    }

    public void resourceChanged(IResourceChangeEvent event) {
        IResourceDelta delta = event.getDelta();
        if (delta == null)
            return;
        try {
            delta.accept(new ResourceDeltaVisitor());
        } catch (CoreException e) {
            Activator.getDefault().logWarning(e);
        }
    }

}