http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: CompressedObject.java 1661887 2015-02-24 11:23:44Z ssteiner $ */

package org.apache.fop.pdf;

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


Represents a PDF object that may appear in an object stream. An object stream is a PDF
stream whose content is a sequence of PDF objects. See Section 3.4.6 of the PDF 1.5
Reference.

/**
 * Represents a PDF object that may appear in an object stream. An object stream is a PDF
 * stream whose content is a sequence of PDF objects. See Section 3.4.6 of the PDF 1.5
 * Reference.
 */
interface CompressedObject {

    
Returns the object number of this indirect object. Note that a compressed object
must have a generation number of 0.

Returns:the object number.
/**
     * Returns the object number of this indirect object. Note that a compressed object
     * must have a generation number of 0.
     *
     * @return the object number.
     */
    PDFObjectNumber getObjectNumber();

    
Outputs this object's content into the given stream.

Params:
  • outputStream – a stream, likely to be provided by the containing object stream
Throws:
Returns:the number of bytes written to the stream
/**
     * Outputs this object's content into the given stream.
     *
     * @param outputStream a stream, likely to be provided by the containing object stream
     * @return the number of bytes written to the stream
     * @throws IOException
     */
    int output(OutputStream outputStream) throws IOException;

}