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