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The Core Camel Java DSL based router
/**
* 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.processor;
import java.lang.reflect.Constructor;
import org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.CamelContext;
import org.apache.camel.CamelContextAware;
import org.apache.camel.CamelExchangeException;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Traceable;
import org.apache.camel.spi.IdAware;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.AsyncProcessorHelper;
import org.apache.camel.util.ObjectHelper;
/**
* The processor which sets an {@link Exception} on the {@link Exchange}
*/
public class ThrowExceptionProcessor extends ServiceSupport implements AsyncProcessor, Traceable, IdAware, CamelContextAware {
private String id;
private CamelContext camelContext;
private Expression simple;
private final Exception exception;
private final Class type;
private final String message;
public ThrowExceptionProcessor(Exception exception) {
this(exception, null, null);
}
public ThrowExceptionProcessor(Exception exception, Class type, String message) {
this.exception = exception;
this.type = type;
this.message = message;
}
public void process(Exchange exchange) throws Exception {
AsyncProcessorHelper.process(this, exchange);
}
public boolean process(Exchange exchange, AsyncCallback callback) {
Exception cause = exception;
try {
if (message != null && type != null) {
// create the message using simple language so it can be dynamic
String text = simple.evaluate(exchange, String.class);
// create a new exception of that type, and provide the message as
Constructor constructor = type.getDeclaredConstructor(String.class);
cause = (Exception) constructor.newInstance(text);
exchange.setException(cause);
} else {
exchange.setException(cause);
}
} catch (Throwable e) {
exchange.setException(new CamelExchangeException("Error creating new instance of " + exception.getClass(), exchange, e));
}
callback.done(true);
return true;
}
public String getTraceLabel() {
String className = this.exception == null ? this.type.getSimpleName() : this.exception.getClass().getSimpleName();
return "throwException[" + className + "]";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Exception getException() {
return exception;
}
public Class getType() {
return type;
}
public String getMessage() {
return message;
}
public CamelContext getCamelContext() {
return camelContext;
}
public void setCamelContext(CamelContext camelContext) {
this.camelContext = camelContext;
}
public String toString() {
return "ThrowException";
}
@Override
protected void doStart() throws Exception {
ObjectHelper.notNull(camelContext, "camelContext", this);
if (message != null) {
simple = camelContext.resolveLanguage("simple").createExpression(message);
}
}
@Override
protected void doStop() throws Exception {
// noop
}
}