org/objectweb/proactive/branchnbound/core/Result.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This 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 2.1 of the License, or any later version.
 *  
 * This 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.branchnbound.core;

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

import org.objectweb.proactive.branchnbound.core.exception.NoResultsException;


public class Result implements Serializable {
    private Object theSolution = null;
    private Exception exception = null;

    public Result() {
    }

    public Result(Object theSolution) {
        assert theSolution instanceof Comparable;
        this.theSolution = theSolution;
    }

    public Result(Exception e) {
        this.exception = e;
    }

    public Object getSolution() {
        return this.theSolution;
    }

    public Exception getException() {
        return this.exception;
    }

    public void setSolution(Object theSolution) {
        assert theSolution instanceof Comparable;
        this.theSolution = theSolution;
    }

    public Result returnTheBest(Result other) {
        if (((Comparable) this.theSolution).compareTo(other.getSolution()) <= 0) {
            return this;
        }
        return other;
    }

    public String toString() {
        return this.theSolution.toString();
    }

    public boolean isBetterThan(Result other) {
        if (((Comparable) this.theSolution).compareTo(other.theSolution) < 0) {
            return true;
        }
        return false;
    }

    public boolean isAnException() {
        return this.exception != null;
    }

    // Serialization ----------------------------------------------------------
    private static final String NORESULT = "--No result--";

    private void writeObject(ObjectOutputStream out) throws IOException {
        if (this.theSolution instanceof NoResultsException) {
            out.write(NORESULT.getBytes());
        } else {
            out.writeObject(this.theSolution);
        }
    }

    private void readObject(ObjectInputStream in)
        throws IOException, ClassNotFoundException {
        Object readObject = in.readObject();
        if (readObject instanceof String &&
                (((String) readObject).compareTo(NORESULT) == 0)) {
            this.theSolution = new NoResultsException();
        } else {
            this.theSolution = readObject;
        }
    }
}

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