123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869 |
- /*
- * 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;
- }
- }
|