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PDF renderer implementation supporting the subset of PDF 1.4 specification.

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/*
 * $Id: PDFXref.java,v 1.4 2009-02-12 13:53:56 tomoke Exp $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * 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 (at your option) 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.sun.pdfview;

/**
 * An indirect reference to some object in the PDFFile
 *
 */
public class PDFXref {

    private int objectNumber;
    private int generation;


    /**
     * create a new PDFXref, given a parsed id and generation.
     */
    public PDFXref(int objectNumber, int gen) {
        this.objectNumber = objectNumber;
        this.generation = gen;
    }

    /**
     * get the generation of this object
     */
    public int getGeneration() {
        return generation;
    }

    /**
     * get the object number of this object
     */
    public int getObjectNumber() {
        return objectNumber;
    }

    @Override
    public boolean equals(Object obj) {
        return (obj instanceof PDFXref) &&
                ((PDFXref)obj).objectNumber == objectNumber &&
                ((PDFXref)obj).generation == generation;
    }

    @Override
    public int hashCode() {
        return objectNumber ^ (generation << 8);
    }
}