/**
* 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.
*/
package org.apache.camel.component.fop;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.util.Map;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.camel.Exchange;
import org.apache.camel.RuntimeExchangeException;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.util.IntrospectionSupport;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.pdf.PDFEncryptionParams;
/**
* The Fop producer.
*/
public class FopProducer extends DefaultProducer {
private final FopFactory fopFactory;
private final String remaining;
public FopProducer(FopEndpoint endpoint, FopFactory fopFactory, String remaining) {
super(endpoint);
this.fopFactory = fopFactory;
this.remaining = remaining;
}
public void process(Exchange exchange) throws Exception {
FOUserAgent userAgent = fopFactory.newFOUserAgent();
Map<String, Object> headers = exchange.getIn().getHeaders();
setRenderParameters(userAgent, headers);
setEncryptionParameters(userAgent, headers);
String outputFormat = getOutputFormat(exchange);
Source src = exchange.getIn().getBody(StreamSource.class);
OutputStream out = transform(userAgent, outputFormat, src);
exchange.getOut().setBody(out);
// propagate headers
exchange.getOut().setHeaders(headers);
}
private String getOutputFormat(Exchange exchange) {
String outputFormat = exchange.getIn()
.getHeader(FopConstants.CAMEL_FOP_OUTPUT_FORMAT, this.remaining, String.class);
if (outputFormat == null) {
throw new RuntimeExchangeException("Missing output format", exchange);
}
return outputFormat;
}
private OutputStream transform(FOUserAgent userAgent, String outputFormat, Source src)
throws FOPException, TransformerException {
OutputStream out = new ByteArrayOutputStream();
Fop fop = fopFactory.newFop(outputFormat, userAgent, out);
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
Result res = new SAXResult(fop.getDefaultHandler());
transformer.transform(src, res);
return out;
}
@SuppressWarnings("unchecked")
private void setEncryptionParameters(FOUserAgent userAgent, Map<String, Object> headers)
throws Exception {
Map<String, Object> encryptionParameters = IntrospectionSupport
.extractProperties(headers, FopConstants.CAMEL_FOP_ENCRYPT);
if (!encryptionParameters.isEmpty()) {
PDFEncryptionParams encryptionParams = new PDFEncryptionParams();
IntrospectionSupport.setProperties(encryptionParams, encryptionParameters);
userAgent.getRendererOptions().put("encryption-params", encryptionParams);
}
}
private void setRenderParameters(FOUserAgent userAgent, Map<String, Object> headers) throws Exception {
Map<String, Object> parameters = IntrospectionSupport
.extractProperties(headers, FopConstants.CAMEL_FOP_RENDER);
if (!parameters.isEmpty()) {
IntrospectionSupport.setProperties(userAgent, parameters);
}
}
}