/**
* 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.spring.handler;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.xml.bind.Binder;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.apache.camel.ExchangePattern;
import org.apache.camel.builder.xml.Namespaces;
import org.apache.camel.model.dataformat.ArtixDSDataFormat;
import org.apache.camel.model.dataformat.JaxbDataFormat;
import org.apache.camel.model.dataformat.SerializationDataFormat;
import org.apache.camel.model.dataformat.XMLBeansDataFormat;
import org.apache.camel.model.loadbalancer.RandomLoadBalanceStrategy;
import org.apache.camel.model.loadbalancer.RoundRobinLoadBalanceStrategy;
import org.apache.camel.model.loadbalancer.StickyLoadBalanceStrategy;
import org.apache.camel.model.loadbalancer.TopicLoadBalanceStrategy;
import org.apache.camel.spi.NamespaceAware;
import org.apache.camel.spring.CamelBeanPostProcessor;
import org.apache.camel.spring.CamelContextFactoryBean;
import org.apache.camel.spring.CamelJMXAgentType;
import org.apache.camel.spring.CamelTemplateFactoryBean;
import org.apache.camel.spring.EndpointFactoryBean;
import org.apache.camel.spring.remoting.CamelProxyFactoryBean;
import org.apache.camel.spring.remoting.CamelServiceExporter;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.view.ModelFileGenerator;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.NamespaceHandlerSupport;
import org.springframework.beans.factory.xml.ParserContext;
/**
* Camel namespace for the spring XML configuration file.
*/
public class CamelNamespaceHandler extends NamespaceHandlerSupport {
protected BeanDefinitionParser endpointParser = new BeanDefinitionParser(EndpointFactoryBean.class);
protected BeanDefinitionParser beanPostProcessorParser = new BeanDefinitionParser(CamelBeanPostProcessor.class);
protected Set<String> parserElementNames = new HashSet<String>();
protected Binder<Node> binder;
private JAXBContext jaxbContext;
private Map<String, BeanDefinitionParser> parserMap = new HashMap<String, BeanDefinitionParser>();
public ModelFileGenerator createModelFileGenerator() throws JAXBException {
return new ModelFileGenerator(getJaxbContext());
}
public void init() {
// remoting
addBeanDefinitionParser("proxy", CamelProxyFactoryBean.class);
addBeanDefinitionParser("template", CamelTemplateFactoryBean.class);
addBeanDefinitionParser("export", CamelServiceExporter.class);
// data types
addBeanDefinitionParser("artixDS", ArtixDSDataFormat.class);
addBeanDefinitionParser("jaxb", JaxbDataFormat.class);
addBeanDefinitionParser("serialization", SerializationDataFormat.class);
addBeanDefinitionParser("xmlBeans", XMLBeansDataFormat.class);
// load balancers
addBeanDefinitionParser("roundRobin", RoundRobinLoadBalanceStrategy.class);
addBeanDefinitionParser("random", RandomLoadBalanceStrategy.class);
addBeanDefinitionParser("sticky", StickyLoadBalanceStrategy.class);
addBeanDefinitionParser("topic", TopicLoadBalanceStrategy.class);
// jmx agent
addBeanDefinitionParser("jmxAgent", CamelJMXAgentType.class);
// TODO switch to use the above mechanism?
registerParser("endpoint", endpointParser);
Class cl = CamelContextFactoryBean.class;
try {
cl = Class.forName("org.apache.camel.osgi.CamelContextFactoryBean");
} catch (Throwable t) {
}
registerParser("camelContext", new CamelContextBeanDefinitionParser(cl));
}
private void addBeanDefinitionParser(String elementName, Class<?> type) {
BeanDefinitionParser parser = new BeanDefinitionParser(type);
registerParser(elementName, parser);
parserMap.put(elementName, parser);
}
protected void createBeanPostProcessor(ParserContext parserContext, String contextId, Element childElement, BeanDefinitionBuilder parentBuilder) {
String beanPostProcessorId = contextId + ":beanPostProcessor";
childElement.setAttribute("id", beanPostProcessorId);
BeanDefinition definition = beanPostProcessorParser.parse(childElement, parserContext);
definition.getPropertyValues().addPropertyValue("camelContext", new RuntimeBeanReference(contextId));
parentBuilder.addPropertyReference("beanPostProcessor", beanPostProcessorId);
}
protected void registerScriptParser(String elementName, String engineName) {
registerParser(elementName, new ScriptDefinitionParser(engineName));
}
protected void registerParser(String name,
org.springframework.beans.factory.xml.BeanDefinitionParser parser) {
parserElementNames.add(name);
registerBeanDefinitionParser(name, parser);
}
public Set<String> getParserElementNames() {
return parserElementNames;
}
protected Object parseUsingJaxb(Element element, ParserContext parserContext) {
try {
binder = getJaxbContext().createBinder();
return binder.unmarshal(element);
/*
* Unmarshaller unmarshaller =
* getJaxbContext().createUnmarshaller(); return
* unmarshaller.unmarshal(element);
*/
} catch (JAXBException e) {
throw new BeanDefinitionStoreException("Failed to parse JAXB element: " + e, e);
}
}
public JAXBContext getJaxbContext() throws JAXBException {
if (jaxbContext == null) {
jaxbContext = createJaxbContext();
}
return jaxbContext;
}
protected JAXBContext createJaxbContext() throws JAXBException {
StringBuilder packages = new StringBuilder();
for (Class cl : getJaxbPackages()) {
if (packages.length() > 0) {
packages.append(":");
}
packages.append(cl.getName().substring(0, cl.getName().lastIndexOf('.')));
}
return JAXBContext.newInstance(packages.toString(), getClass().getClassLoader());
}
protected Set<Class> getJaxbPackages() {
Set<Class> classes = new HashSet<Class>();
classes.add(org.apache.camel.spring.CamelContextFactoryBean.class);
classes.add(ExchangePattern.class);
classes.add(org.apache.camel.model.RouteType.class);
classes.add(org.apache.camel.model.config.StreamResequencerConfig.class);
classes.add(org.apache.camel.model.dataformat.DataFormatType.class);
classes.add(org.apache.camel.model.language.ExpressionType.class);
classes.add(org.apache.camel.model.loadbalancer.LoadBalancerType.class);
return classes;
}
protected class CamelContextBeanDefinitionParser extends BeanDefinitionParser {
public CamelContextBeanDefinitionParser(Class type) {
super(type);
}
@Override
protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
super.doParse(element, parserContext, builder);
String contextId = element.getAttribute("id");
// lets avoid folks having to explicitly give an ID to a camel
// context
if (ObjectHelper.isNullOrBlank(contextId)) {
contextId = "camelContext";
element.setAttribute("id", contextId);
}
// now lets parse the routes
Object value = parseUsingJaxb(element, parserContext);
if (value instanceof CamelContextFactoryBean) {
CamelContextFactoryBean factoryBean = (CamelContextFactoryBean)value;
builder.addPropertyValue("id", contextId);
builder.addPropertyValue("routes", factoryBean.getRoutes());
builder.addPropertyValue("intercepts", factoryBean.getIntercepts());
builder.addPropertyValue("dataFormats", factoryBean.getDataFormats());
builder.addPropertyValue("builderRefs", factoryBean.getBuilderRefs());
if (factoryBean.getPackages().length > 0) {
builder.addPropertyValue("packages", factoryBean.getPackages());
}
}
boolean createdBeanPostProcessor = false;
NodeList list = element.getChildNodes();
int size = list.getLength();
for (int i = 0; i < size; i++) {
Node child = list.item(i);
if (child instanceof Element) {
Element childElement = (Element)child;
String localName = child.getLocalName();
if (localName.equals("beanPostProcessor")) {
createBeanPostProcessor(parserContext, contextId, childElement, builder);
createdBeanPostProcessor = true;
} else if (localName.equals("endpoint")) {
BeanDefinition definition = endpointParser.parse(childElement, parserContext);
String id = childElement.getAttribute("id");
if (ObjectHelper.isNotNullAndNonEmpty(id)) {
// TODO we can zap this?
definition.getPropertyValues()
.addPropertyValue("camelContext", new RuntimeBeanReference(contextId));
// definition.getPropertyValues().addPropertyValue("context",
// builder.getBeanDefinition());
parserContext.registerComponent(new BeanComponentDefinition(definition, id));
}
} else {
BeanDefinitionParser parser = parserMap.get(localName);
if (parser != null) {
BeanDefinition definition = parser.parse(childElement, parserContext);
String id = childElement.getAttribute("id");
if (ObjectHelper.isNotNullAndNonEmpty(id)) {
parserContext.registerComponent(new BeanComponentDefinition(definition, id));
if (localName.equals("jmxAgent")) {
builder.addPropertyReference("camelJMXAgent", id);
}
}
}
}
}
}
// lets inject the namespaces into any namespace aware POJOs
injectNamespaces(element);
if (!createdBeanPostProcessor) {
// no bean processor element so lets create it by ourself
Element childElement = element.getOwnerDocument().createElement("beanPostProcessor");
element.appendChild(childElement);
createBeanPostProcessor(parserContext, contextId, childElement, builder);
}
}
}
protected void injectNamespaces(Element element) {
NodeList list = element.getChildNodes();
Namespaces namespaces = null;
int size = list.getLength();
for (int i = 0; i < size; i++) {
Node child = list.item(i);
if (child instanceof Element) {
Element childElement = (Element)child;
Object object = binder.getJAXBNode(child);
if (object instanceof NamespaceAware) {
NamespaceAware namespaceAware = (NamespaceAware)object;
if (namespaces == null) {
namespaces = new Namespaces(element);
}
namespaces.configure(namespaceAware);
}
injectNamespaces(childElement);
}
}
}
}