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.language.bean; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Expression; 021 import org.apache.camel.Predicate; 022 import org.apache.camel.builder.PredicateBuilder; 023 import org.apache.camel.spi.Language; 024 import org.apache.camel.util.ObjectHelper; 025 026 /** 027 * A <a href="http://activemq.apache.org/camel/bean-language.html>bean language</a> 028 * which uses a simple text notation to invoke methods on beans to evaluate predicates or expressions<p/> 029 * <p/> 030 * The notation is essentially <code>beanName.methodName</code> which is then invoked using the 031 * beanName to lookup in the <a href="http://activemq.apache.org/camel/registry.html>registry</a> 032 * then the method is invoked to evaluate the expression using the 033 * <a href="http://activemq.apache.org/camel/bean-integration.html>bean integration</a> to bind the 034 * {@link Exchange} to the method arguments. 035 * 036 * @version $Revision: 35332 $ 037 */ 038 public class BeanLanguage implements Language { 039 public Predicate<Exchange> createPredicate(String expression) { 040 return PredicateBuilder.toPredicate(createExpression(expression)); 041 } 042 043 public Expression<Exchange> createExpression(String expression) { 044 ObjectHelper.notNull(expression, "expression"); 045 046 int idx = expression.lastIndexOf('.'); 047 String beanName = expression; 048 String method = null; 049 if (idx > 0) { 050 beanName = expression.substring(0, idx); 051 method = expression.substring(idx + 1); 052 } 053 return new BeanExpression(beanName, method); 054 } 055 }