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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
/* $Id$ */
package org.apache.fop.pdf;
// Java
import java.io.IOException;
import java.io.OutputStream;
/**
* PDF Form XObject
*
* A derivative of the PDFXObject, is a PDF Stream that has not only a
* dictionary but a stream of image data.
*/
public class PDFFormXObject extends PDFXObject {
private PDFStream contents;
private String resRef;
/**
* create a FormXObject with the given number and name and load the
* image in the object
*
* @param xnumber the pdf object X number
* @param cont the pdf stream contents
* @param ref the resource PDF reference
*/
public PDFFormXObject(int xnumber, PDFStream cont, String ref) {
super(xnumber, null);
contents = cont;
resRef = ref;
}
/**
* Output the form stream as PDF.
* This sets up the form XObject dictionary and adds the content
* data stream.
*
* @param stream the output stream to write the data
* @throws IOException if there is an error writing the data
* @return the length of the data written
*/
protected int output(OutputStream stream) throws IOException {
int length = 0;
String dictEntries = getFilterList().buildFilterDictEntries();
final StreamCache encodedStream = encodeStream();
StringBuffer sb = new StringBuffer(128);
sb.append(getObjectID());
sb.append("<</Type /XObject\n");
sb.append("/Subtype /Form\n");
sb.append("/FormType 1\n");
sb.append("/BBox [0 0 1000 1000]\n");
sb.append("/Matrix [1 0 0 1 0 0]\n");
sb.append("/Resources " + resRef + "\n");
sb.append("/Length " + (encodedStream.getSize() + 1) + "\n");
sb.append(dictEntries);
sb.append(">>\n");
// push the pdf dictionary on the writer
byte[] pdfBytes = encode(sb.toString());
stream.write(pdfBytes);
length += pdfBytes.length;
//Send encoded stream to target OutputStream
length += outputStreamData(encodedStream, stream);
encodedStream.clear(); //Encoded stream can now be discarded
pdfBytes = encode("endobj\n");
stream.write(pdfBytes);
length += pdfBytes.length;
// let it gc
// this object is retained as a reference to inserting
// the same image but the image data is no longer needed
contents = null;
return length;
}
/**
* @see org.apache.fop.pdf.PDFStream#outputRawStreamData(OutputStream)
*/
protected void outputRawStreamData(OutputStream out) throws IOException {
contents.outputRawStreamData(out);
}
}
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