eu.esdihumboldt.hale.io.xslt.internal.Templates.java Source code

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Here is the source code for eu.esdihumboldt.hale.io.xslt.internal.Templates.java

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/*
 * Copyright (c) 2012 Fraunhofer IGD
 * 
 * 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:
 *     Fraunhofer IGD
 */

package eu.esdihumboldt.hale.io.xslt.internal;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.collections.ExtendedProperties;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.resource.Resource;
import org.apache.velocity.runtime.resource.loader.ResourceLoader;

import com.google.common.io.ByteSource;
import com.google.common.io.Files;

/**
 * The main XSLT templates.
 * 
 * @author Simon Templer
 */
public class Templates extends ResourceLoader {

    /**
     * The root template containing the
     */
    public static final String ROOT = "transform.xsl";

    /**
     * Copy the main templates to the given template folder.
     * 
     * @param templateFolder the template folder
     * @throws IOException if copying the templates fails
     */
    public static void copyTemplates(File templateFolder) throws IOException {
        copyTemplate(templateFolder, ROOT);
    }

    /**
     * Copy a template to the given target folder.
     * 
     * @param targetFolder the target folder
     * @param templateFileName the template file name, must lie next to the
     *            {@link Templates} class
     * @throws IOException if copying the template fails
     */
    private static void copyTemplate(final File targetFolder, final String templateFileName) throws IOException {
        new ByteSource() {

            @Override
            public InputStream openStream() throws IOException {
                return Templates.class.getResourceAsStream(templateFileName);
            }

        }.copyTo(Files.asByteSink(new File(targetFolder, templateFileName)));
    }

    @Override
    public InputStream getResourceStream(String source) throws ResourceNotFoundException {
        try {
            return Templates.class.getResourceAsStream(source);
        } catch (Exception e) {
            throw new ResourceNotFoundException(e);
        }
    }

    @Override
    public boolean isSourceModified(Resource resource) {
        return false;
    }

    @Override
    public long getLastModified(Resource resource) {
        return 0;
    }

    @Override
    public void init(ExtendedProperties configuration) {
        // do nothing
    }

}