/**
* 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.xslt;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Map;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.URIResolver;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.builder.xml.ResultHandlerFactory;
import org.apache.camel.builder.xml.XsltBuilder;
import org.apache.camel.builder.xml.XsltUriResolver;
import org.apache.camel.converter.jaxp.XmlConverter;
import org.apache.camel.impl.DefaultComponent;
import org.apache.camel.impl.ProcessorEndpoint;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ResourceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An <a href="http://camel.apache.org/xslt.html">XSLT Component</a>
* for performing XSLT transforms of messages
*/
public class XsltComponent extends DefaultComponent {
private static final transient Logger LOG = LoggerFactory.getLogger(XsltComponent.class);
private XmlConverter xmlConverter;
private URIResolver uriResolver;
private boolean contentCache = true;
public XmlConverter getXmlConverter() {
return xmlConverter;
}
public void setXmlConverter(XmlConverter xmlConverter) {
this.xmlConverter = xmlConverter;
}
public URIResolver getUriResolver() {
return uriResolver;
}
public void setUriResolver(URIResolver uriResolver) {
this.uriResolver = uriResolver;
}
public boolean isContentCache() {
return contentCache;
}
public void setContentCache(boolean contentCache) {
this.contentCache = contentCache;
}
protected Endpoint createEndpoint(String uri, final String remaining, Map<String, Object> parameters) throws Exception {
final String resourceUri = remaining;
LOG.debug("{} using schema resource: {}", this, resourceUri);
final XsltBuilder xslt = getCamelContext().getInjector().newInstance(XsltBuilder.class);
// lets allow the converter to be configured
XmlConverter converter = resolveAndRemoveReferenceParameter(parameters, "converter", XmlConverter.class);
if (converter == null) {
converter = getXmlConverter();
}
if (converter != null) {
xslt.setConverter(converter);
}
String transformerFactoryClassName = getAndRemoveParameter(parameters, "transformerFactoryClass", String.class);
TransformerFactory factory = null;
if (transformerFactoryClassName != null) {
// provide the class loader of this component to work in OSGi environments
Class<?> factoryClass = getCamelContext().getClassResolver().resolveClass(transformerFactoryClassName, XsltComponent.class.getClassLoader());
if (factoryClass != null) {
factory = (TransformerFactory) getCamelContext().getInjector().newInstance(factoryClass);
} else {
LOG.warn("Cannot find the TransformerFactoryClass with the class name: {}", transformerFactoryClassName);
}
}
if (parameters.get("transformerFactory") != null) {
factory = resolveAndRemoveReferenceParameter(parameters, "transformerFactory", TransformerFactory.class);
}
if (factory != null) {
xslt.getConverter().setTransformerFactory(factory);
}
// lookup custom resolver to use
URIResolver resolver = resolveAndRemoveReferenceParameter(parameters, "uriResolver", URIResolver.class);
if (resolver == null) {
// not in endpoint then use component specific resolver
resolver = getUriResolver();
}
if (resolver == null) {
// fallback to use a Camel specific resolver
resolver = new XsltUriResolver(getCamelContext().getClassResolver(), remaining);
}
// set resolver before input stream as resolver is used when loading the input stream
xslt.setUriResolver(resolver);
ResultHandlerFactory resultHandlerFactory = resolveAndRemoveReferenceParameter(parameters, "resultHandlerFactory", ResultHandlerFactory.class);
if (resultHandlerFactory != null) {
xslt.setResultHandlerFactory(resultHandlerFactory);
}
Boolean failOnNullBody = getAndRemoveParameter(parameters, "failOnNullBody", Boolean.class);
if (failOnNullBody != null) {
xslt.setFailOnNullBody(failOnNullBody);
}
String output = getAndRemoveParameter(parameters, "output", String.class);
configureOutput(xslt, output);
configureXslt(xslt, uri, remaining, parameters);
loadResource(xslt, resourceUri);
// default to use the cache option from the component if the endpoint did not have the contentCache parameter
boolean cache = getAndRemoveParameter(parameters, "contentCache", Boolean.class, contentCache);
if (!cache) {
return new ProcessorEndpoint(uri, this, xslt) {
@Override
protected void onExchange(Exchange exchange) throws Exception {
// force to load the resource on each exchange as we are not cached
loadResource(xslt, resourceUri);
super.onExchange(exchange);
}
};
} else {
// we have already loaded xslt so we are cached
return new ProcessorEndpoint(uri, this, xslt);
}
}
private void loadResource(XsltBuilder xslt, String resourceUri) throws TransformerConfigurationException, IOException {
LOG.trace("{} loading schema resource: {}", this, resourceUri);
// prefer to use URL over InputStream as it loads better with http
URL url = ResourceHelper.resolveMandatoryResourceAsUrl(getCamelContext().getClassResolver(), resourceUri);
xslt.setTransformerURL(url);
}
protected void configureXslt(XsltBuilder xslt, String uri, String remaining, Map<String, Object> parameters) throws Exception {
setProperties(xslt, parameters);
}
protected void configureOutput(XsltBuilder xslt, String output) throws Exception {
if (ObjectHelper.isEmpty(output)) {
return;
}
if ("string".equalsIgnoreCase(output)) {
xslt.outputString();
} else if ("bytes".equalsIgnoreCase(output)) {
xslt.outputBytes();
} else if ("DOM".equalsIgnoreCase(output)) {
xslt.outputDOM();
} else if ("file".equalsIgnoreCase(output)) {
xslt.outputFile();
} else {
throw new IllegalArgumentException("Unknown output type: " + output);
}
}
}