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.AsyncCallback; 020 import org.apache.camel.Exchange; 021 import org.apache.camel.Predicate; 022 import org.apache.camel.Processor; 023 import org.apache.camel.Traceable; 024 import org.apache.camel.util.ServiceHelper; 025 import org.slf4j.Logger; 026 import org.slf4j.LoggerFactory; 027 028 /** 029 * The processor which implements the 030 * <a href="http://camel.apache.org/message-filter.html">Message Filter</a> EIP pattern. 031 * 032 * @version 033 */ 034 public class FilterProcessor extends DelegateAsyncProcessor implements Traceable { 035 private static final Logger LOG = LoggerFactory.getLogger(FilterProcessor.class); 036 private final Predicate predicate; 037 038 public FilterProcessor(Predicate predicate, Processor processor) { 039 super(processor); 040 this.predicate = predicate; 041 } 042 043 @Override 044 public boolean process(Exchange exchange, AsyncCallback callback) { 045 boolean matches = false; 046 try { 047 matches = predicate.matches(exchange); 048 } catch (Throwable e) { 049 exchange.setException(e); 050 } 051 052 LOG.debug("Filter matches: {} for exchange: {}", matches, exchange); 053 054 // set property whether the filter matches or not 055 exchange.setProperty(Exchange.FILTER_MATCHED, matches); 056 057 if (matches) { 058 return processor.process(exchange, callback); 059 } else { 060 callback.done(true); 061 return true; 062 } 063 } 064 065 @Override 066 public String toString() { 067 return "Filter[if: " + predicate + " do: " + getProcessor() + "]"; 068 } 069 070 public String getTraceLabel() { 071 return "filter[if: " + predicate + "]"; 072 } 073 074 public Predicate getPredicate() { 075 return predicate; 076 } 077 078 @Override 079 protected void doStart() throws Exception { 080 super.doStart(); 081 ServiceHelper.startService(predicate); 082 } 083 084 @Override 085 protected void doStop() throws Exception { 086 ServiceHelper.stopService(predicate); 087 super.doStop(); 088 } 089 }