eu.esdihumboldt.hale.ui.util.graph.ExportGraphAction.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.util.graph.ExportGraphAction.java

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/*
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.util.graph;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;

import javax.imageio.ImageIO;

import org.apache.commons.io.FilenameUtils;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.draw2d.IFigure;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.ProgressMonitorDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.zest.core.viewers.GraphViewer;
import org.eclipse.zest.core.widgets.Graph;

import de.fhg.igd.slf4jplus.ALogger;
import de.fhg.igd.slf4jplus.ALoggerFactory;
import eu.esdihumboldt.hale.ui.util.graph.internal.GraphUIUtilBundle;

/**
 * Renders a graph and saves it to a file.
 * 
 * @author Simon Templer
 */
public class ExportGraphAction extends Action {

    private static final ALogger log = ALoggerFactory.getLogger(ExportGraphAction.class);

    private final GraphViewer viewer;

    /**
     * Create an action that renders and saves a graph to a file.
     * 
     * @param viewer the graph viewer
     */
    public ExportGraphAction(GraphViewer viewer) {
        this.viewer = viewer;

        setText("Export to file");
        setToolTipText("Export the graph to an image or dot file");
        setImageDescriptor(GraphUIUtilBundle.getImageDescriptor("icons/export.gif"));
    }

    /**
     * @see Action#run()
     */
    @Override
    public void run() {
        FileDialog dialog = new FileDialog(Display.getCurrent().getActiveShell(), SWT.SAVE);
        // XXX if called from TTreeExporter during transformation, the active
        // shell may be null!

        dialog.setOverwrite(true);
        dialog.setText("Export graph to file");

        String[] imageExtensions = ImageIO.getWriterFileSuffixes();

        StringBuffer extensions = new StringBuffer("*.svg;*.gv;*.dot");
        for (String imageExt : imageExtensions) {
            extensions.append(";*.");
            extensions.append(imageExt);
        }

        dialog.setFilterExtensions(new String[] { extensions.toString() });

        dialog.setFilterNames(new String[] { "Image, SVG or dot file (" + extensions + ")" });

        String fileName = dialog.open();
        if (fileName != null) {
            final File file = new File(fileName);

            //         //XXX use an off-screen graph (testing)
            //         OffscreenGraph graph = new OffscreenGraph(1000, 1000) {
            //            
            //            @Override
            //            protected void configureViewer(GraphViewer viewer) {
            //               viewer.setContentProvider(RenderAction.this.viewer.getContentProvider());
            //               viewer.setLabelProvider(RenderAction.this.viewer.getLabelProvider());
            //               viewer.setInput(RenderAction.this.viewer.getInput());
            //               viewer.setLayoutAlgorithm(new TreeLayoutAlgorithm(TreeLayoutAlgorithm.LEFT_RIGHT), false);
            //            }
            //         };

            // get the graph
            final Graph graph = viewer.getGraphControl();

            final String ext = FilenameUtils.getExtension(file.getAbsolutePath());
            final IFigure root = graph.getRootLayer();

            ProgressMonitorDialog progress = new ProgressMonitorDialog(Display.getCurrent().getActiveShell());
            try {
                progress.run(false, false, new IRunnableWithProgress() {

                    @Override
                    public void run(IProgressMonitor monitor)
                            throws InvocationTargetException, InterruptedException {
                        try {
                            OutputStream out = new BufferedOutputStream(new FileOutputStream(file));

                            if (ext.equalsIgnoreCase("gv") || ext.equalsIgnoreCase("dot")) {
                                OffscreenGraph.saveDot(graph, out);
                            }
                            //                     else if (ext.equalsIgnoreCase("svg")) {
                            //                        OffscreenGraph.saveSVG(root, out);
                            //                     }
                            else {
                                OffscreenGraph.saveImage(root, out, ext);
                            }
                        } catch (Throwable e) {
                            log.userError("Error saving graph to file", e);
                        }
                    }

                });
            } catch (Throwable e) {
                log.error("Error launching graph export", e);
            }
        }
    }

}