MarshallerObjectCache.java

/*******************************************************************************
 * Copyright French Prime minister Office/SGMAP/DINSIC/Vitam Program (2015-2019)
 *
 * contact.vitam@culture.gouv.fr
 *
 * This software is a computer program whose purpose is to implement a digital archiving back-office system managing
 * high volumetry securely and efficiently.
 *
 * This software is governed by the CeCILL 2.1 license under French law and abiding by the rules of distribution of free
 * software. You can use, modify and/ or redistribute the software under the terms of the CeCILL 2.1 license as
 * circulated by CEA, CNRS and INRIA at the following URL "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and rights to copy, modify and redistribute granted by the license,
 * users are provided only with a limited warranty and the software's author, the holder of the economic rights, and the
 * successive licensors have only limited liability.
 *
 * In this respect, the user's attention is drawn to the risks associated with loading, using, modifying and/or
 * developing or reproducing the software by the user in light of its specific status of free software, that may mean
 * that it is complicated to manipulate, and that also therefore means that it is reserved for developers and
 * experienced professionals having in-depth computer knowledge. Users are therefore encouraged to load and test the
 * software's suitability as regards their requirements in conditions enabling the security of their systems and/or data
 * to be ensured and, more generally, to use and operate it in the same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had knowledge of the CeCILL 2.1 license and that you
 * accept its terms.
 *******************************************************************************/
package fr.gouv.vitam.worker.core;

import java.util.HashMap;
import java.util.Map;

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

/**
 * Cache the Marshaller Object as its initialization takes about 40ms
 */
public class MarshallerObjectCache {
    private final Map<Class<?>, Marshaller> marshallbyclass = new HashMap<>();

    /**
     * Empty constructor
     */
    public MarshallerObjectCache() {
        // Empty constructor
    }

    /**
     * Cache of the marshaller object
     *
     * @param c : class whom we want the JAXB Marshaller
     * @return The JAXB Marshaller for the class given in argument
     * @throws JAXBException
     */

    public Marshaller getMarshaller(Class<?> c) throws JAXBException {
        if (marshallbyclass.get(c) == null) {
            final JAXBContext jc = JAXBContext.newInstance(c);
            final Marshaller marshaller = jc.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
            marshallbyclass.put(c, marshaller);
        }
        return marshallbyclass.get(c);

    }


}