blob: b1eb365df1fe82ead84a17dcc797eb32404fe50a [file] [log] [blame]
/*
* 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;
}
}