examples/org.eclipse.sphinx.examples.hummingbird20.diagram.gmf/src/org/eclipse/sphinx/examples/hummingbird20/diagram/gmf/navigator/Hummingbird20DomainNavigatorContentProvider.java

/**
 * <copyright>
 * 
 * Copyright (c) 2013 itemis 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: 
 *     itemis - Initial API and implementation
 * 
 * </copyright>
 */
package org.eclipse.sphinx.examples.hummingbird20.diagram.gmf.navigator;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;

import org.eclipse.core.resources.IFile;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryContentProvider;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.emf.workspace.WorkspaceEditingDomainFactory;
import org.eclipse.emf.workspace.util.WorkspaceSynchronizer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.sphinx.examples.hummingbird20.diagram.gmf.part.Hummingbird20DiagramEditorPlugin;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.navigator.ICommonContentExtensionSite;
import org.eclipse.ui.navigator.ICommonContentProvider;

/**
 * @generated
 */
public class Hummingbird20DomainNavigatorContentProvider implements ICommonContentProvider {

	/**
	 * @generated
	 */
	private AdapterFactoryContentProvider myAdapterFctoryContentProvier;

	/**
	 * @generated
	 */
	private static final Object[] EMPTY_ARRAY = new Object[0];

	/**
	 * @generated
	 */
	private Viewer myViewer;

	/**
	 * @generated
	 */
	private AdapterFactoryEditingDomain myEditingDomain;

	/**
	 * @generated
	 */
	private WorkspaceSynchronizer myWorkspaceSynchronizer;

	/**
	 * @generated
	 */
	private Runnable myViewerRefreshRunnable;

	/**
	 * @generated
	 */
	public Hummingbird20DomainNavigatorContentProvider() {
		myAdapterFctoryContentProvier = new AdapterFactoryContentProvider(Hummingbird20DiagramEditorPlugin.getInstance()
				.getItemProvidersAdapterFactory());
		TransactionalEditingDomain editingDomain = WorkspaceEditingDomainFactory.INSTANCE.createEditingDomain();
		myEditingDomain = (AdapterFactoryEditingDomain) editingDomain;
		myEditingDomain.setResourceToReadOnlyMap(new HashMap() {
			@Override
			public Object get(Object key) {
				if (!containsKey(key)) {
					put(key, Boolean.TRUE);
				}
				return super.get(key);
			}
		});
		myViewerRefreshRunnable = new Runnable() {
			@Override
			public void run() {
				if (myViewer != null) {
					myViewer.refresh();
				}
			}
		};
		myWorkspaceSynchronizer = new WorkspaceSynchronizer(editingDomain, new WorkspaceSynchronizer.Delegate() {
			@Override
			public void dispose() {
			}

			@Override
			public boolean handleResourceChanged(final Resource resource) {
				unloadAllResources();
				asyncRefresh();
				return true;
			}

			@Override
			public boolean handleResourceDeleted(Resource resource) {
				unloadAllResources();
				asyncRefresh();
				return true;
			}

			@Override
			public boolean handleResourceMoved(Resource resource, final URI newURI) {
				unloadAllResources();
				asyncRefresh();
				return true;
			}
		});
	}

	/**
	 * @generated
	 */
	@Override
	public void dispose() {
		myWorkspaceSynchronizer.dispose();
		myWorkspaceSynchronizer = null;
		myViewerRefreshRunnable = null;
		myViewer = null;
		unloadAllResources();
		((TransactionalEditingDomain) myEditingDomain).dispose();
		myEditingDomain = null;
	}

	/**
	 * @generated
	 */
	@Override
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		myViewer = viewer;
	}

	/**
	 * @generated
	 */
	void unloadAllResources() {
		for (Resource nextResource : myEditingDomain.getResourceSet().getResources()) {
			nextResource.unload();
		}
	}

	/**
	 * @generated
	 */
	void asyncRefresh() {
		if (myViewer != null && !myViewer.getControl().isDisposed()) {
			myViewer.getControl().getDisplay().asyncExec(myViewerRefreshRunnable);
		}
	}

	/**
	 * @generated
	 */
	@Override
	public Object[] getElements(Object inputElement) {
		return getChildren(inputElement);
	}

	/**
	 * @generated
	 */
	@Override
	public void restoreState(IMemento aMemento) {
	}

	/**
	 * @generated
	 */
	@Override
	public void saveState(IMemento aMemento) {
	}

	/**
	 * @generated
	 */
	@Override
	public void init(ICommonContentExtensionSite aConfig) {
	}

	/**
	 * @generated
	 */
	@Override
	public Object[] getChildren(Object parentElement) {
		if (parentElement instanceof IFile) {
			IFile file = (IFile) parentElement;
			URI fileURI = URI.createPlatformResourceURI(file.getFullPath().toString(), true);
			Resource resource = myEditingDomain.getResourceSet().getResource(fileURI, true);
			return wrapEObjects(myAdapterFctoryContentProvier.getChildren(resource), parentElement);
		}

		if (parentElement instanceof Hummingbird20DomainNavigatorItem) {
			return wrapEObjects(myAdapterFctoryContentProvier.getChildren(((Hummingbird20DomainNavigatorItem) parentElement).getEObject()),
					parentElement);
		}
		return EMPTY_ARRAY;
	}

	/**
	 * @generated
	 */
	public Object[] wrapEObjects(Object[] objects, Object parentElement) {
		Collection result = new ArrayList();
		for (Object object : objects) {
			if (object instanceof EObject) {
				result.add(new Hummingbird20DomainNavigatorItem((EObject) object, parentElement, myAdapterFctoryContentProvier));
			}
		}
		return result.toArray();
	}

	/**
	 * @generated
	 */
	@Override
	public Object getParent(Object element) {
		if (element instanceof Hummingbird20AbstractNavigatorItem) {
			Hummingbird20AbstractNavigatorItem abstractNavigatorItem = (Hummingbird20AbstractNavigatorItem) element;
			return abstractNavigatorItem.getParent();
		}
		return null;
	}

	/**
	 * @generated
	 */
	@Override
	public boolean hasChildren(Object element) {
		return element instanceof IFile || getChildren(element).length > 0;
	}

}