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/*
* 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.apps;
// Java
import java.io.OutputStream;
import org.xml.sax.helpers.DefaultHandler;
import org.apache.fop.fo.FOTreeBuilder;
/**
* Primary class that activates the FOP process for embedded usage.
* <P>
* JAXP is the standard method of embedding FOP in Java programs.
* Please check our
* <a href="http://xmlgraphics.apache.org/fop/trunk/embedding.html">embedding page</a>
* for samples (these are also available within the distribution in
* FOP_DIR\examples\embedding)
* <P>
* Methods within FOUserAgent are available to customize portions of the
* process. For example, a specific Renderer object can be specified,
* also ElementMappings which determine elements in the FO that can be
* processed) can be added.
* <P>
* At the moment, it is recommended not to reuse an instance of this
* class for more than one rendering run.
*/
public class Fop {
// desired output format: MIME type such as "application/pdf", "application/postscript" etc.
private String outputFormat = null;
// output stream to send results to
private OutputStream stream = null;
// FOUserAgent object to set processing options
private final FOUserAgent foUserAgent;
// FOTreeBuilder object to maintain reference for access to results
private FOTreeBuilder foTreeBuilder = null;
/**
* Constructor for use with already-created FOUserAgents. It uses MIME types to select the
* output format (ex. "application/pdf" for PDF).
* @param outputFormat the MIME type of the output format to use (ex. "application/pdf").
* @param ua FOUserAgent object
* @param stream the output stream
* @throws FOPException if setting up the DefaultHandler fails
*/
Fop(String outputFormat, FOUserAgent ua, OutputStream stream) throws FOPException {
if (ua == null) {
throw new FOPException("Cannot create a new Fop instance without a User Agent.");
}
this.outputFormat = outputFormat;
foUserAgent = ua;
this.stream = stream;
createDefaultHandler();
}
/**
* Get the FOUserAgent instance associated with the rendering run represented by this instance.
* @return the user agent
*
* @deprecated this getter doesn't need to exist. By virtue of the fact that the client has
* an instance of this object, it means they also have the {@link FOUserAgent} since this's
* constructor is only used in {@link FOUserAgent}
*/
public FOUserAgent getUserAgent() {
return foUserAgent;
}
/**
* Creates a DefaultHandler object used to generate the document.
* Note this object implements the ContentHandler interface.
* For processing with a Transformer object, this DefaultHandler object
* can be used in the SAXResult constructor.
* Alternatively, for processing with a SAXParser, this object can be
* used as the DefaultHandler argument to its parse() methods.
*
* @throws FOPException if setting up the DefaultHandler fails
*/
private void createDefaultHandler() throws FOPException {
this.foTreeBuilder = new FOTreeBuilder(outputFormat, foUserAgent, stream);
}
/**
* Returns the DefaultHandler object that will receive the SAX stream containing the
* FO document to be rendered.
* @return the SAX DefaultHandler for handling the SAX events.
* @throws FOPException if setting up the DefaultHandler fails
*/
public DefaultHandler getDefaultHandler() throws FOPException {
if (foTreeBuilder == null) {
createDefaultHandler();
}
return this.foTreeBuilder;
}
/**
* Returns the results of the rendering process. Information includes
* the total number of pages generated and the number of pages per
* page-sequence. Call this method only after the rendering process is
* finished. Note that the results are only available for output formats
* which make use of FOP's layout engine (PDF, PS, etc.).
* @return the results of the rendering process, or null for flow-oriented
* output formats like RTF and MIF.
*/
public FormattingResults getResults() {
if (foTreeBuilder == null) {
throw new IllegalStateException(
"Results are only available after calling getDefaultHandler().");
} else {
return foTreeBuilder.getResults();
}
}
}
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