bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/ModelReconcilingService.java

/*******************************************************************************
 * Copyright (c) 2009 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.e4.ui.internal.workbench;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import javax.inject.Inject;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.core.runtime.Status;
import org.eclipse.e4.core.services.log.Logger;
import org.eclipse.e4.ui.workbench.modeling.IModelReconcilingService;
import org.eclipse.e4.ui.workbench.modeling.ModelDelta;
import org.eclipse.e4.ui.workbench.modeling.ModelReconciler;

public class ModelReconcilingService implements IModelReconcilingService {

	@Inject
	private Logger logger;

	public ModelReconciler createModelReconciler() {
		return new XMLModelReconciler();
	}

	public IStatus applyDeltas(Collection<ModelDelta> deltas) {
		return applyDeltas(deltas, null);
	}

	public IStatus applyDeltas(Collection<ModelDelta> deltas, String[] filters) {
		if (filters == null) {
			filters = new String[0];
		}

		MultiStatus multiStatus = new MultiStatus(Activator.PI_WORKBENCH, 0, "", null); //$NON-NLS-1$
		LinkedList<ModelDelta> delayedDeltas = new LinkedList<ModelDelta>();

		deltaIterationLoop: for (final ModelDelta delta : deltas) {
			for (String filter : filters) {
				if (delta.getAttributeName().equals(filter)) {
					continue deltaIterationLoop;
				}
			}

			final IStatus[] status = new IStatus[1];
			SafeRunner.run(new ISafeRunnable() {
				public void run() throws Exception {
					status[0] = delta.apply();
				}

				public void handleException(Throwable exception) {
					status[0] = new Status(IStatus.ERROR, Activator.PI_WORKBENCH,
							"Failed to apply delta", exception); //$NON-NLS-1$
				}
			});

			if (status[0].getSeverity() == IStatus.CANCEL) {
				delayedDeltas.add(delta);
				continue;
			}
			multiStatus.add(status[0]);

			switch (status[0].getCode()) {
			case IStatus.INFO:
				logger.info(status[0].getMessage());
				break;
			case IStatus.WARNING:
				logger.warn(status[0].getMessage());
				break;
			case IStatus.ERROR:
				logger.error(status[0].getMessage());
				break;
			}
		}

		for (Iterator<ModelDelta> it = delayedDeltas.iterator(); it.hasNext();) {
			final ModelDelta delta = it.next();
			final IStatus[] status = new IStatus[1];
			SafeRunner.run(new ISafeRunnable() {
				public void run() throws Exception {
					status[0] = delta.apply();
				}

				public void handleException(Throwable exception) {
					status[0] = new Status(IStatus.ERROR, Activator.PI_WORKBENCH,
							"Failed to apply delta", exception); //$NON-NLS-1$
				}
			});

			if (status[0].getSeverity() == IStatus.CANCEL) {
				continue;
			}

			multiStatus.add(status[0]);

			switch (status[0].getCode()) {
			case IStatus.INFO:
				logger.info(status[0].getMessage());
				break;
			case IStatus.WARNING:
				logger.warn(status[0].getMessage());
				break;
			case IStatus.ERROR:
				logger.error(status[0].getMessage());
				break;
			}
		}

		return multiStatus;
	}

}