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 org.apache.camel.AsyncCallback;
020import org.apache.camel.AsyncProcessor;
021import org.apache.camel.Exchange;
022import org.apache.camel.Expression;
023import org.apache.camel.Traceable;
024import org.apache.camel.spi.IdAware;
025import org.apache.camel.support.ServiceSupport;
026import org.apache.camel.util.AsyncProcessorHelper;
027import org.apache.camel.util.ObjectHelper;
028
029/**
030 * A processor which sets the property on the exchange with an {@link org.apache.camel.Expression}
031 */
032public class SetPropertyProcessor extends ServiceSupport implements AsyncProcessor, Traceable, IdAware {
033    private String id;
034    private final Expression propertyName;
035    private final Expression expression;
036
037    public SetPropertyProcessor(Expression propertyName, Expression expression) {
038        this.propertyName = propertyName;
039        this.expression = expression;
040        ObjectHelper.notNull(propertyName, "propertyName");
041        ObjectHelper.notNull(expression, "expression");
042    }
043
044    public void process(Exchange exchange) throws Exception {
045        AsyncProcessorHelper.process(this, exchange);
046    }
047
048    @Override
049    public boolean process(Exchange exchange, AsyncCallback callback) {
050        try {
051            Object newProperty = expression.evaluate(exchange, Object.class);
052
053            if (exchange.getException() != null) {
054                // the expression threw an exception so we should break-out
055                callback.done(true);
056                return true;
057            }
058
059            String key = propertyName.evaluate(exchange, String.class);
060            exchange.setProperty(key, newProperty);
061        } catch (Throwable e) {
062            exchange.setException(e);
063        }
064
065        callback.done(true);
066        return true;
067    }
068
069    @Override
070    public String toString() {
071        return "SetProperty(" + propertyName + ", " + expression + ")";
072    }
073
074    public String getTraceLabel() {
075        return "setProperty[" + propertyName + ", " + expression + "]";
076    }
077
078    public String getId() {
079        return id;
080    }
081
082    public void setId(String id) {
083        this.id = id;
084    }
085
086    public String getPropertyName() {
087        return propertyName.toString();
088    }
089
090    public Expression getExpression() {
091        return expression;
092    }
093
094    @Override
095    protected void doStart() throws Exception {
096        // noop
097    }
098
099    @Override
100    protected void doStop() throws Exception {
101        // noop
102    }
103}