org.granite.hibernate4.jmf.AbstractPersistentCollectionCodec.java Source code

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Here is the source code for org.granite.hibernate4.jmf.AbstractPersistentCollectionCodec.java

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/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services 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 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services 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 this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
package org.granite.hibernate4.jmf;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.SortedMap;
import java.util.SortedSet;

import org.granite.messaging.jmf.ExtendedObjectInput;
import org.granite.messaging.jmf.ExtendedObjectOutput;
import org.granite.messaging.jmf.JMFConstants;
import org.granite.messaging.jmf.codec.ExtendedObjectCodec;
import org.granite.messaging.jmf.persistence.JMFPersistentCollectionSnapshot;
import org.granite.messaging.persistence.PersistentCollectionSnapshot;
import org.hibernate.collection.spi.PersistentCollection;

/**
 * @author Franck WOLFF
 */
public abstract class AbstractPersistentCollectionCodec<H extends PersistentCollection>
        implements ExtendedObjectCodec {

    protected final Class<H> hibernateCollectionClass;
    protected final String clientCollectionClassName;

    public AbstractPersistentCollectionCodec(Class<H> hibernateCollectionClass) {
        this.hibernateCollectionClass = hibernateCollectionClass;
        this.clientCollectionClassName = JMFConstants.CLIENT_PERSISTENCE_COLLECTION_PACKAGE + "."
                + hibernateCollectionClass.getSimpleName();
    }

    public boolean canEncode(ExtendedObjectOutput out, Object v) {
        return v.getClass() == hibernateCollectionClass;
    }

    public String getEncodedClassName(ExtendedObjectOutput out, Object v) {
        return clientCollectionClassName;
    }

    public void encode(ExtendedObjectOutput out, Object v) throws IOException, IllegalAccessException {
        JMFPersistentCollectionSnapshot snapshot = null;

        PersistentCollection collection = (PersistentCollection) v;
        if (!collection.wasInitialized())
            snapshot = new JMFPersistentCollectionSnapshot(
                    collection instanceof SortedSet || collection instanceof SortedMap, null);
        else if (collection instanceof Map)
            snapshot = new JMFPersistentCollectionSnapshot(true, null, collection.isDirty(),
                    (Map<?, ?>) collection);
        else
            snapshot = new JMFPersistentCollectionSnapshot(true, null, collection.isDirty(),
                    (Collection<?>) collection);

        snapshot.writeExternal(out);
    }

    public boolean canDecode(ExtendedObjectInput in, String className) {
        return clientCollectionClassName.equals(className);
    }

    public String getDecodedClassName(ExtendedObjectInput in, String className) {
        return hibernateCollectionClass.getName();
    }

    @SuppressWarnings("unchecked")
    public void decode(ExtendedObjectInput in, Object v)
            throws IOException, ClassNotFoundException, IllegalAccessException {
        PersistentCollection collection = (PersistentCollection) v;
        if (collection.wasInitialized()) {
            boolean sorted = (collection instanceof SortedSet || collection instanceof SortedMap);
            PersistentCollectionSnapshot snapshot = new JMFPersistentCollectionSnapshot(sorted, null);
            snapshot.readCoreData(in);

            if (collection instanceof Map)
                ((Map<Object, Object>) collection).putAll(snapshot.getElementsAsMap());
            else
                ((Collection<Object>) collection).addAll(snapshot.getElementsAsCollection());

            if (snapshot.isDirty())
                collection.dirty();
            else
                collection.clearDirty();
        }
    }
}