/**
* 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.model;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;
import org.apache.camel.CamelContext;
import org.apache.camel.Predicate;
import org.apache.camel.Processor;
import org.apache.camel.processor.Pipeline;
import org.apache.camel.spi.InterceptStrategy;
import org.apache.camel.spi.RouteContext;
/**
* Represents an XML <intercept/> element
*
* @version
*/
@XmlRootElement(name = "intercept")
@XmlAccessorType(XmlAccessType.FIELD)
public class InterceptDefinition extends OutputDefinition<InterceptDefinition> {
@XmlTransient
protected Processor output;
@XmlTransient
protected final List<Processor> intercepted = new ArrayList<Processor>();
public InterceptDefinition() {
}
@Override
public String toString() {
return "Intercept[" + getOutputs() + "]";
}
@Override
public String getShortName() {
return "intercept";
}
@Override
public String getLabel() {
return "intercept";
}
@Override
public boolean isAbstract() {
return true;
}
@Override
public boolean isTopLevelOnly() {
return true;
}
@Override
public Processor createProcessor(final RouteContext routeContext) throws Exception {
// create the output processor
output = this.createChildProcessor(routeContext, true);
// add the output as a intercept strategy to the route context so its invoked on each processing step
routeContext.getInterceptStrategies().add(new InterceptStrategy() {
private Processor interceptedTarget;
public Processor wrapProcessorInInterceptors(CamelContext context, ProcessorDefinition<?> definition,
Processor target, Processor nextTarget) throws Exception {
// store the target we are intercepting
this.interceptedTarget = target;
// remember the target that was intercepted
intercepted.add(interceptedTarget);
if (interceptedTarget != null) {
// wrap in a pipeline so we continue routing to the next
List<Processor> list = new ArrayList<Processor>(2);
list.add(output);
list.add(interceptedTarget);
return new Pipeline(context, list);
} else {
return output;
}
}
@Override
public String toString() {
return "intercept[" + (interceptedTarget != null ? interceptedTarget : output) + "]";
}
});
// remove me from the route so I am not invoked in a regular route path
routeContext.getRoute().getOutputs().remove(this);
// and return no processor to invoke next from me
return null;
}
/**
* Applies this interceptor only if the given predicate is true
*
* @param predicate the predicate
* @return the builder
*/
public InterceptDefinition when(Predicate predicate) {
WhenDefinition when = new WhenDefinition(predicate);
addOutput(when);
return this;
}
/**
* This method is <b>only</b> for handling some post configuration
* that is needed since this is an interceptor, and we have to do
* a bit of magic logic to fixup to handle predicates
* with or without proceed/stop set as well.
*/
public void afterPropertiesSet() {
if (getOutputs().size() == 0) {
// no outputs
return;
}
ProcessorDefinition<?> first = getOutputs().get(0);
if (first instanceof WhenDefinition) {
WhenDefinition when = (WhenDefinition) first;
// move this outputs to the when, expect the first one
// as the first one is the interceptor itself
for (int i = 1; i < outputs.size(); i++) {
ProcessorDefinition<?> out = outputs.get(i);
when.addOutput(out);
}
// remove the moved from the original output, by just keeping the first one
ProcessorDefinition<?> keep = outputs.get(0);
clearOutput();
outputs.add(keep);
}
}
public Processor getInterceptedProcessor(int index) {
// avoid out of bounds
if (index <= intercepted.size() - 1) {
return intercepted.get(index);
} else {
return null;
}
}
}