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.Predicate;
021    import org.apache.camel.Processor;
022    import org.apache.commons.logging.Log;
023    import org.apache.commons.logging.LogFactory;
024    
025    /**
026     * The processor which implements the
027     * <a href="http://camel.apache.org/message-filter.html">Message Filter</a> EIP pattern.
028     *
029     * @version $Revision: 783663 $
030     */
031    public class FilterProcessor extends DelegateProcessor {
032        private static final Log LOG = LogFactory.getLog(FilterProcessor.class);
033        private final Predicate predicate;
034    
035        public FilterProcessor(Predicate predicate, Processor processor) {
036            super(processor);
037            this.predicate = predicate;
038        }
039    
040        public void process(Exchange exchange) throws Exception {
041            if (predicate.matches(exchange)) {
042                super.process(exchange);
043            } else {
044                if (LOG.isDebugEnabled()) {
045                    LOG.debug("Marking exchange as filtered: " + exchange);
046                }
047                // mark this exchange as filtered
048                exchange.setProperty(Exchange.FILTERED, Boolean.TRUE);
049            }
050        }
051    
052        @Override
053        public String toString() {
054            return "Filter[if: " + predicate + " do: " + getProcessor() + "]";
055        }
056    
057        public Predicate getPredicate() {
058            return predicate;
059        }
060    }