1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586 |
- /*
- * 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);
- }
- }
-
- }
|