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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.util.ArrayList;
import java.util.List;
import org.apache.fop.pdf.xref.CompressedObjectReference;
/**
* Manages a collection of object streams, creating new streams as necessary to keep the
* number of objects in each stream at the recommended value. Streams are related to each
* other through the use of the Extends entry in the stream dictionary.
*/
class ObjectStreamManager {
private static final int OBJECT_STREAM_CAPACITY = 100;
private final PDFDocument pdfDocument;
private final List<CompressedObjectReference> compressedObjectReferences;
private int numObjectsInStream;
private ObjectStream currentObjectStream;
ObjectStreamManager(PDFDocument pdfDocument) {
this.pdfDocument = pdfDocument;
createObjectStream();
compressedObjectReferences = new ArrayList<CompressedObjectReference>();
}
void add(CompressedObject compressedObject) {
if (numObjectsInStream++ == OBJECT_STREAM_CAPACITY) {
createObjectStream();
numObjectsInStream = 1;
}
compressedObjectReferences.add(currentObjectStream.addObject(compressedObject));
}
private void createObjectStream() {
currentObjectStream = currentObjectStream == null
? new ObjectStream()
: new ObjectStream(currentObjectStream);
pdfDocument.assignObjectNumber(currentObjectStream);
pdfDocument.addTrailerObject(currentObjectStream);
}
List<CompressedObjectReference> getCompressedObjectReferences() {
return compressedObjectReferences;
}
}
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