com.lowagie.text.pdf.PdfIndirectObject.java Source code

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/*
 * $Id: PdfIndirectObject.java 3912 2009-04-26 08:38:15Z blowagie $
 * $Name$
 *
 * Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text.pdf;

import java.io.IOException;
import java.io.OutputStream;

import com.lowagie.text.DocWriter;

/**
 * <CODE>PdfIndirectObject</CODE> is the Pdf indirect object.
 * <P>
 * An <I>indirect object</I> is an object that has been labeled so that it can be referenced by
 * other objects. Any type of <CODE>PdfObject</CODE> may be labeled as an indirect object.<BR>
 * An indirect object consists of an object identifier, a direct object, and the <B>endobj</B>
 * keyword. The <I>object identifier</I> consists of an integer <I>object number</I>, an integer
 * <I>generation number</I>, and the <B>obj</B> keyword.<BR>
 * This object is described in the 'Portable Document Format Reference Manual version 1.7'
 * section 3.2.9 (page 63-65).
 *
 * @see      PdfObject
 * @see      PdfIndirectReference
 */

public class PdfIndirectObject {

    // membervariables

    /** The object number */
    protected int number;

    /** the generation number */
    protected int generation = 0;

    static final byte STARTOBJ[] = DocWriter.getISOBytes(" obj\n");
    static final byte ENDOBJ[] = DocWriter.getISOBytes("\nendobj\n");
    static final int SIZEOBJ = STARTOBJ.length + ENDOBJ.length;
    PdfObject object;
    PdfWriter writer;

    // constructors

    /**
     * Constructs a <CODE>PdfIndirectObject</CODE>.
     *
     * @param      number         the object number
     * @param      object         the direct object
     */

    PdfIndirectObject(int number, PdfObject object, PdfWriter writer) {
        this(number, 0, object, writer);
    }

    PdfIndirectObject(PdfIndirectReference ref, PdfObject object, PdfWriter writer) {
        this(ref.getNumber(), ref.getGeneration(), object, writer);
    }

    /**
     * Constructs a <CODE>PdfIndirectObject</CODE>.
     *
     * @param      number         the object number
     * @param      generation      the generation number
     * @param      object         the direct object
     */

    PdfIndirectObject(int number, int generation, PdfObject object, PdfWriter writer) {
        this.writer = writer;
        this.number = number;
        this.generation = generation;
        this.object = object;
        PdfEncryption crypto = null;
        if (writer != null)
            crypto = writer.getEncryption();
        if (crypto != null) {
            crypto.setHashKey(number, generation);
        }
    }

    // methods

    /**
     * Return the length of this <CODE>PdfIndirectObject</CODE>.
     *
     * @return      the length of the PDF-representation of this indirect object.
     */

    //    public int length() {
    //        if (isStream)
    //            return bytes.size() + SIZEOBJ + stream.getStreamLength(writer);
    //        else
    //            return bytes.size();
    //    }

    /**
     * Returns a <CODE>PdfIndirectReference</CODE> to this <CODE>PdfIndirectObject</CODE>.
     *
     * @return      a <CODE>PdfIndirectReference</CODE>
     */

    public PdfIndirectReference getIndirectReference() {
        return new PdfIndirectReference(object.type(), number, generation);
    }

    /**
     * Writes efficiently to a stream
     *
     * @param os the stream to write to
     * @throws IOException on write error
     */
    void writeTo(OutputStream os) throws IOException {
        os.write(DocWriter.getISOBytes(String.valueOf(number)));
        os.write(' ');
        os.write(DocWriter.getISOBytes(String.valueOf(generation)));
        os.write(STARTOBJ);
        object.toPdf(writer, os);
        os.write(ENDOBJ);
    }
}