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/*
* $Id: PdfIndirectObject.java,v 1.35 2003/05/02 09:01:25 blowagie Exp $
* $Name: $
*
* Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
*
*
* 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.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*
*
* 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 1.3'
* section 4.10 (page 53).
*
* @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 "); // ssteward
static final byte ENDOBJ[] = DocWriter.getISOBytes("\nendobj "); // ssteward
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 eficiently to a stream
*
* @param os the stream to write to
* @throws IOException on write error
*/
void writeTo(OutputStream os) throws IOException
{
// ssteward: don't os.write() anything here, before the number, or you'll throw off the xref position
os.write(DocWriter.getISOBytes(String.valueOf(number)));
os.write(' ');
os.write(DocWriter.getISOBytes(String.valueOf(generation)));
os.write(STARTOBJ);
// ssteward
//int type = object.type();
//if (type != PdfObject.ARRAY && type != PdfObject.DICTIONARY && type != PdfObject.NAME && type != PdfObject.STRING)
// os.write(' ');
object.toPdf(writer, os);
os.write(ENDOBJ);
}
}
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