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     */
017    package org.apache.camel.processor;
018    
019    import org.apache.camel.Exchange;
020    import org.apache.camel.Expression;
021    import org.apache.camel.Processor;
022    
023    /**
024     * A processor which evaluates an Expression and logs it.
025     *
026     * @version $Revision: 892606 $
027     */
028    public class LogProcessor implements Processor, Traceable {
029    
030        private final Expression expression;
031        private final Logger logger;
032    
033        public LogProcessor(Expression expression, Logger logger) {
034            this.expression = expression;
035            this.logger = logger;
036        }
037    
038        public void process(Exchange exchange) throws Exception {
039            String msg = expression.evaluate(exchange, String.class);
040            logger.log(msg);
041        }
042    
043        @Override
044        public String toString() {
045            return "Log[" + expression + "]";
046        }
047    
048        public String getTraceLabel() {
049            return "log[" + expression + "]";
050        }
051    }