| /* |
| * 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.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * Optional Content Group Dictionary, which we will call a 'layer'. |
| */ |
| public class PDFLayer extends PDFIdentifiedDictionary { |
| |
| public abstract static class Resolver { |
| private boolean resolved; |
| private PDFLayer layer; |
| private Object extension; |
| public Resolver(PDFLayer layer, Object extension) { |
| this.layer = layer; |
| this.extension = extension; |
| } |
| public PDFLayer getLayer() { |
| return layer; |
| } |
| public Object getExtension() { |
| return extension; |
| } |
| public void resolve() { |
| if (!resolved) { |
| performResolution(); |
| resolved = true; |
| } |
| } |
| protected void performResolution() { |
| } |
| } |
| |
| private Resolver resolver; |
| |
| public PDFLayer(String id) { |
| super(id); |
| put("Type", new PDFName("OCG")); |
| } |
| |
| @Override |
| public int output(OutputStream stream) throws IOException { |
| if (resolver != null) { |
| resolver.resolve(); |
| } |
| return super.output(stream); |
| } |
| |
| public void setResolver(Resolver resolver) { |
| this.resolver = resolver; |
| } |
| |
| public void populate(Object name, Object intent, Object usage) { |
| if (name != null) { |
| put("Name", name); |
| } |
| if (intent != null) { |
| put("Intent", intent); |
| } |
| if (usage != null) { |
| put("Usage", usage); |
| } |
| } |
| |
| } |
| |