eu.esdihumboldt.hale.ui.application.handler.ShowHandbookHandler.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.application.handler.ShowHandbookHandler.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.application.handler;

import java.awt.Desktop;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import org.apache.commons.io.FileUtils;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;

import eu.esdihumboldt.hale.ui.application.internal.HALEApplicationPlugin;
import eu.esdihumboldt.hale.ui.util.ExceptionHelper;

/**
 * This class is the handler for opening a PDF-manual.
 * 
 * @author Michel Krmer
 */
public class ShowHandbookHandler extends AbstractHandler implements IHandler {

    /**
     * The name of the PDF file to open
     */
    private static final String PDFFILE = "hale_manual_en.pdf"; //$NON-NLS-1$

    /**
     * @see IHandler#execute(ExecutionEvent)
     */
    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {

        String tempDirName = System.getProperty("java.io.tmpdir"); //$NON-NLS-1$
        if (!tempDirName.endsWith("/")) { //$NON-NLS-1$
            tempDirName = tempDirName + "/"; //$NON-NLS-1$
        }
        tempDirName = tempDirName + HALEApplicationPlugin.PLUGIN_ID + "/"; //$NON-NLS-1$

        File tempDir = new File(tempDirName);
        tempDir.mkdirs();
        tempDir.deleteOnExit();

        File pdfFile = new File(tempDirName + PDFFILE);
        if (pdfFile.exists()) {
            FileUtils.deleteQuietly(pdfFile);
        }

        pdfFile.deleteOnExit();

        URL pdfUrl = this.getClass().getResource("/documentation/" + PDFFILE); //$NON-NLS-1$
        if (pdfUrl == null) {
            throw new RuntimeException("Manual could not be retrieved."); //$NON-NLS-1$
        }

        InputStream in;
        try {
            in = pdfUrl.openStream();
        } catch (IOException e) {
            ExceptionHelper.handleException("Could not open Streaming.", //$NON-NLS-1$
                    HALEApplicationPlugin.PLUGIN_ID, e);
            return null;
        }

        FileOutputStream fos = null;
        byte[] buffer = new byte[4096];
        int read;
        try {
            fos = new FileOutputStream(pdfFile);

            while ((read = in.read(buffer)) != -1) {
                fos.write(buffer, 0, read);
            }
        } catch (IOException e) {
            ExceptionHelper.handleException("Error while reading the file.", //$NON-NLS-1$
                    HALEApplicationPlugin.PLUGIN_ID, e);
            return null;
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
                in.close();
            } catch (IOException e) {
                // ignore
            }
        }

        try {
            Desktop.getDesktop().open(pdfFile);
        } catch (IOException e) {
            ExceptionHelper.handleException("The file could not be opened", //$NON-NLS-1$
                    HALEApplicationPlugin.PLUGIN_ID, e);
        }

        return null;
    }

}