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The official jQuery user interface library: https://github.com/jquery/jquery-ui

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	Commit message (Expand)	Author	Age	Files	Lines
*	All: Added http://jqueryui.com/about to header comments.	Scott González	2010-07-14	1	-1/+1
*	All: Define a local undefined variable inside the main closure.	Scott González	2010-07-13	1	-1/+1
*	Updated copyright headers to make it clear that you can choose between MIT an...	Scott González	2010-07-09	1	-3/+3
*	Happy New Year	Richard Worth	2010-01-20	1	-1/+1
*	Pulsate: Rewrote pulsate effect.	Scott González	2009-11-16	1	-32/+27
*	renamed all ui..js files to jquery.ui..js, all effects.*.js files to jquery...	Richard Worth	2009-09-17	1	-0/+56

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/*
 * $Id$
 * ============================================================================
 *                    The Apache Software License, Version 1.1
 * ============================================================================
 * 
 * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment: "This product includes software
 *    developed by the Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself, if
 *    and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "FOP" and "Apache Software Foundation" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    apache@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache", nor may
 *    "Apache" appear in their name, without prior written permission of the
 *    Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
 * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ============================================================================
 * 
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Apache Software Foundation and was originally created by
 * James Tauber <jtauber@jtauber.com>. For more information on the Apache
 * Software Foundation, please see <http://www.apache.org/>.
 */ 
package org.apache.fop.pdf;

// Java
import java.io.IOException;
import java.io.OutputStream;

/**
 * generic PDF object.
 *
 * A PDF Document is essentially a collection of these objects. A PDF
 * Object has a number and a generation (although the generation will always
 * be 0 in new documents).
 */
public abstract class PDFObject {

    /**
     * the object's number
     */
    protected int number;

    /**
     * the object's generation (0 in new documents)
     */
    protected int generation = 0;

    /**
     * create an empty object
     *
     * @param number the object's number
     */
    public PDFObject(int number) {
        this.number = number;
    }

    /**
     * Create a PDFObject
     */
    public PDFObject() {
        // do nothing
    }

    /**
     * @return the PDF Object number
     */
    public int getNumber() {
        return this.number;
    }

    /**
     * write the PDF represention of this object
     *
     * @param stream the stream to write the PDF to
     * @throws IOException if there is an error writing to the stream
     * @return the number of bytes written
     */
    protected int output(OutputStream stream) throws IOException {
        byte[] pdf = this.toPDF();
        stream.write(pdf);
        return pdf.length;
    }

    /**
     * the PDF representation of a reference to this object
     *
     * @return the reference string
     */
    public String referencePDF() {
        String p = this.number + " " + this.generation + " R";
        return p;
    }

    /**
     * represent object as PDF
     *
     * @return PDF string
     */
    abstract byte[] toPDF();
}