org.squidy.manager.heuristics.HeuristicsHandler.java Source code

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Here is the source code for org.squidy.manager.heuristics.HeuristicsHandler.java

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/**
 * Squidy Interaction Library is free software: you can redistribute it and/or
 * modify it 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.
 * 
 * Squidy Interaction Library is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Squidy Interaction Library. If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * 2009 Human-Computer Interaction Group, University of Konstanz.
 * <http://hci.uni-konstanz.de>
 * 
 * Please contact info@squidy-lib.de or visit our website
 * <http://www.squidy-lib.de> for further information.
 */

package org.squidy.manager.heuristics;

import java.io.InputStream;
import java.io.OutputStream;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.squidy.SquidyException;
import org.squidy.manager.parser.DefaultNamespacePrefixMapper;

/**
 * <code>HeuristicsHandler</code>.
 * 
 * <pre>
 * Date: Mar 28, 2009
 * Time: 2:12:14 PM
 * </pre>
 * 
 * 
 * @author <pre>
 * Roman R&amp;aumldle
 * <a href="mailto:Roman.Raedle@uni-konstanz.de">Roman.Raedle@uni-konstanz.de</a>
 * Human-Computer Interaction Group
 * University of Konstanz
 * </pre>
 * 
 * @version $Id: HeuristicsHandler.java 772 2011-09-16 15:39:44Z raedle $
 * @since 1.0.0
 */
public class HeuristicsHandler {

    // Logger to log info, error, debug,... messages.
    private static final Log LOG = LogFactory.getLog(HeuristicsHandler.class);

    private static HeuristicsHandler INSTANCE;

    /**
     * Singleton pattern.
     * 
     * @return Single instance of diagram model parser.
     */
    public static HeuristicsHandler getHeuristicsHandler() {
        if (INSTANCE == null) {
            INSTANCE = new HeuristicsHandler();
        }
        return INSTANCE;
    }

    /**
     * Use singleton pattern.
     */
    protected HeuristicsHandler() {

    }

    private static JAXBContext context;

    /**
     * Initializes the JAXB context with all required classes.
     * 
     * @return The initialized JAXB context.
     * @throws JAXBException
     *             The exception will be thrown if initialization of the JAXB
     *             context has been failed.
     */
    protected JAXBContext getContext() throws JAXBException {
        if (context != null) {
            return context;
        }

        return context = JAXBContext.newInstance(Heuristics.class, Heuristic.class, Match.class);
    }

    /**
     * @param inputStream
     * @return
     * @throws SquidyException
     */
    public Heuristics load(InputStream inputStream) throws SquidyException {
        try {
            Unmarshaller unmarshaller = getContext().createUnmarshaller();
            return (Heuristics) unmarshaller.unmarshal(inputStream);
        } catch (Exception e) {
            throw new SquidyException("Could not unmarshal input stream.", e);
        }
    }

    /**
     * @param outputStream
     * @param xmi
     */
    public void save(OutputStream outputStream, Heuristics data) {
        try {
            Marshaller marshaller = getContext().createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.setProperty("com.sun.xml.bind.namespacePrefixMapper", new DefaultNamespacePrefixMapper());
            marshaller.marshal(data, outputStream);
        } catch (JAXBException e) {
            if (LOG.isErrorEnabled()) {
                LOG.error(e.getMessage(), e);
            }
        }
    }
}