PageListAccess.java

/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This 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.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.commons.utils;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;


/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
public abstract class PageListAccess<E, S> extends AbstractSerializablePageList<E> implements Serializable {

    /** The state that recreates the list. */
    private S state;

    protected PageListAccess(S state, int pageSize) {
        super(pageSize);

        //
        if (state == null) {
            throw new NullPointerException();
        }
        if (pageSize < 0) {
            throw new IllegalArgumentException();
        }

        //
        this.state = state;
    }

    @Override
    protected final ListAccess<E> connect() throws Exception {
        return create(state);
    }

    protected abstract ListAccess<E> create(S state) throws Exception;

    // Serialization

    private void writeObject(ObjectOutputStream out) throws IOException {
        super.writeState(out);
        out.writeObject(state);
    }

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        super.readState(in);
        state = (S) in.readObject();
    }
}