| /* |
| * 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.render.pdf.pdfbox; |
| |
| import java.io.IOException; |
| import java.net.URI; |
| |
| import org.apache.pdfbox.pdmodel.PDDocument; |
| |
| /** |
| * Handles interceptors (hooks) that can operate on PDF documents. |
| */ |
| public class Interceptors { |
| |
| private static Interceptors instance; |
| |
| private OnLoadInterceptor onLoad = null; |
| |
| public static synchronized Interceptors getInstance() { |
| if (instance == null) { |
| instance = new Interceptors(); |
| } |
| return instance; |
| } |
| |
| /** |
| * Intercepts the given PDF document on load. |
| * @param doc the PDF document |
| * @param uri the URI it has been loaded from (may be null) |
| * @return the given document or potentially an alternative PDF |
| * @throws IOException if an I/O occurs |
| * @see OnLoadInterceptor#intercept(PDDocument, URI) |
| */ |
| public PDDocument interceptOnLoad(PDDocument doc, URI uri) throws IOException { |
| PDDocument result = null; |
| if (onLoad != null) { |
| result = onLoad.intercept(doc, uri); |
| } |
| if (result == null) { |
| result = doc; |
| } |
| return result; |
| } |
| |
| /** |
| * Set the on-load interceptor. |
| * @param interceptor the interceptor instance |
| */ |
| public void setOnLoad(OnLoadInterceptor interceptor) { |
| this.onLoad = interceptor; |
| } |
| |
| } |