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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
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;
}
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
* @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();
}
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