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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.pdf;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.fop.pdf.xref.CompressedObjectReference;
/**
* An object stream, as described in section 3.4.6 of the PDF 1.5 Reference.
*/
public class ObjectStream extends PDFStream {
private static final PDFName OBJ_STM = new PDFName("ObjStm");
private List<CompressedObject> objects = new ArrayList<CompressedObject>();
private int firstObjectOffset;
ObjectStream() {
super(false);
}
ObjectStream(ObjectStream previous) {
this();
put("Extends", previous);
}
CompressedObjectReference addObject(CompressedObject obj) {
if (obj == null) {
throw new NullPointerException("obj must not be null");
}
CompressedObjectReference reference = new CompressedObjectReference(obj.getObjectNumber(),
getObjectNumber(), objects.size());
objects.add(obj);
return reference;
}
@Override
protected void outputRawStreamData(OutputStream out) throws IOException {
int currentOffset = 0;
StringBuilder offsetsPart = new StringBuilder();
ByteArrayOutputStream streamContent = new ByteArrayOutputStream();
for (CompressedObject object : objects) {
offsetsPart.append(object.getObjectNumber())
.append(' ')
.append(currentOffset)
.append('\n');
currentOffset += object.output(streamContent);
}
byte[] offsets = PDFDocument.encode(offsetsPart.toString());
firstObjectOffset = offsets.length;
out.write(offsets);
streamContent.writeTo(out);
}
@Override
protected void populateStreamDict(Object lengthEntry) {
put("Type", OBJ_STM);
put("N", objects.size());
put("First", firstObjectOffset);
super.populateStreamDict(lengthEntry);
}
}
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