| /* |
| * 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); |
| } |
| } |