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: 630591 $
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 }