org.eclipse.viatra.addon.viewers.runtime.zest.sources.ZestContentProvider.java Source code

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Here is the source code for org.eclipse.viatra.addon.viewers.runtime.zest.sources.ZestContentProvider.java

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/*******************************************************************************
 * Copyright (c) 2010-2013, Zoltan Ujhelyi, Istvan Rath and Daniel Varro
 * 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:
 *   Zoltan Ujhelyi - initial API and implementation
 *******************************************************************************/
package org.eclipse.viatra.addon.viewers.runtime.zest.sources;

import org.eclipse.gef4.zest.core.viewers.IGraphContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.viatra.addon.viewers.runtime.notation.Edge;

import com.google.common.collect.Iterables;

/**
 * Content provider for Zest graphs. The implementation is more performant than
 * {@link ZestContentWithIsolatedNodesProvider}, but does not support displaying
 * isolated nodes.
 * 
 * @author Zoltan Ujhelyi
 * 
 */
public class ZestContentProvider extends AbstractZestContentProvider implements IGraphContentProvider {

    public ZestContentProvider() {
        this(false);
    }

    public ZestContentProvider(boolean displayContainment) {
        this.displayContainment = displayContainment;
    }

    @Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        super.inputChanged(viewer, oldInput, newInput);
    }

    @Override
    public Object[] getElements(Object inputElement) {
        if (state != null) {
            Iterable<Edge> it = (displayContainment) ? Iterables.concat(state.getEdges(), state.getContainments())
                    : state.getEdges();
            return Iterables.toArray(it, Edge.class);
        } else
            return new Object[] {};
    }

    @Override
    public Object getSource(Object rel) {
        return ((Edge) rel).getSource();
    }

    @Override
    public Object getDestination(Object rel) {
        return ((Edge) rel).getTarget();
    }

    @Override
    public void edgeAppeared(final Edge edge) {
        viewer.getGraphControl().getDisplay().syncExec(new Runnable() {

            @Override
            public void run() {
                viewer.addRelationship(edge, edge.getSource(), edge.getTarget());
            }
        });
    }

    @Override
    public void edgeDisappeared(final Edge edge) {
        viewer.getGraphControl().getDisplay().syncExec(new Runnable() {

            @Override
            public void run() {
                viewer.removeGraphModelConnection(edge);
                viewer.removeRelationship(edge);
            }
        });
    }

}