001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.processor;
018
019import java.lang.reflect.Constructor;
020
021import org.apache.camel.AsyncCallback;
022import org.apache.camel.AsyncProcessor;
023import org.apache.camel.CamelContext;
024import org.apache.camel.CamelContextAware;
025import org.apache.camel.CamelExchangeException;
026import org.apache.camel.Exchange;
027import org.apache.camel.Expression;
028import org.apache.camel.Traceable;
029import org.apache.camel.spi.IdAware;
030import org.apache.camel.support.ServiceSupport;
031import org.apache.camel.util.AsyncProcessorHelper;
032import org.apache.camel.util.ObjectHelper;
033
034/**
035 * The processor which sets an {@link Exception} on the {@link Exchange}
036 */
037public class ThrowExceptionProcessor extends ServiceSupport implements AsyncProcessor, Traceable, IdAware, CamelContextAware {
038    private String id;
039    private CamelContext camelContext;
040    private Expression simple;
041    private final Exception exception;
042    private final Class<? extends Exception> type;
043    private final String message;
044
045    public ThrowExceptionProcessor(Exception exception) {
046        this(exception, null, null);
047    }
048
049    public ThrowExceptionProcessor(Exception exception, Class<? extends Exception> type, String message) {
050        this.exception = exception;
051        this.type = type;
052        this.message = message;
053    }
054
055    public void process(Exchange exchange) throws Exception {
056        AsyncProcessorHelper.process(this, exchange);
057    }
058
059    public boolean process(Exchange exchange, AsyncCallback callback) {
060        Exception cause = exception;
061
062        try {
063            if (message != null && type != null) {
064                // create the message using simple language so it can be dynamic
065                String text = simple.evaluate(exchange, String.class);
066                // create a new exception of that type, and provide the message as
067                Constructor<?> constructor = type.getDeclaredConstructor(String.class);
068                cause = (Exception) constructor.newInstance(text);
069                exchange.setException(cause);
070            } else {
071                exchange.setException(cause);
072            }
073        } catch (Throwable e) {
074            exchange.setException(new CamelExchangeException("Error creating new instance of " + exception.getClass(), exchange, e));
075        }
076
077        callback.done(true);
078        return true;
079    }
080
081    public String getTraceLabel() {
082        String className = this.exception == null ? this.type.getSimpleName() : this.exception.getClass().getSimpleName();
083        return "throwException[" + className + "]";
084    }
085
086    public String getId() {
087        return id;
088    }
089
090    public void setId(String id) {
091        this.id = id;
092    }
093
094    public Exception getException() {
095        return exception;
096    }
097
098    public Class<? extends Exception> getType() {
099        return type;
100    }
101
102    public String getMessage() {
103        return message;
104    }
105
106    public CamelContext getCamelContext() {
107        return camelContext;
108    }
109
110    public void setCamelContext(CamelContext camelContext) {
111        this.camelContext = camelContext;
112    }
113
114    public String toString() {
115        return "ThrowException";
116    }
117
118    @Override
119    protected void doStart() throws Exception {
120        ObjectHelper.notNull(camelContext, "camelContext", this);
121
122        if (message != null) {
123            simple = camelContext.resolveLanguage("simple").createExpression(message);
124        }
125    }
126
127    @Override
128    protected void doStop() throws Exception {
129        // noop
130    }
131}