| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.language.bean; |
| |
| import org.apache.camel.Expression; |
| import org.apache.camel.IsSingleton; |
| import org.apache.camel.Predicate; |
| import org.apache.camel.builder.PredicateBuilder; |
| import org.apache.camel.spi.Language; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * A <a href="http://camel.apache.org/bean-language.html">bean language</a> |
| * which uses a simple text notation to invoke methods on beans to evaluate predicates or expressions |
| * <p/> |
| * The notation is essentially <code>beanName.methodName</code> which is then invoked using the |
| * beanName to lookup in the <a href="http://camel.apache.org/registry.html>registry</a> |
| * then the method is invoked to evaluate the expression using the |
| * <a href="http://camel.apache.org/bean-integration.html">bean integration</a> to bind the |
| * {@link org.apache.camel.Exchange} to the method arguments. |
| * <p/> |
| * As of Camel 1.5 the bean language also supports invoking a provided bean by |
| * its classname or the bean itself. |
| * |
| * @version |
| */ |
| public class BeanLanguage implements Language, IsSingleton { |
| |
| /** |
| * Creates the expression based on the string syntax. |
| * |
| * @param expression the string syntax <tt>beanRef.methodName</tt> where methodName can be omitted |
| * @return the expression |
| */ |
| public static Expression bean(String expression) { |
| BeanLanguage language = new BeanLanguage(); |
| return language.createExpression(expression); |
| } |
| |
| /** |
| * Creates the expression for invoking the bean type. |
| * |
| * @param beanType the bean type to invoke |
| * @param method optional name of method to invoke for instance to avoid ambiguity |
| * @return the expression |
| */ |
| @SuppressWarnings("unchecked") |
| public static Expression bean(Class beanType, String method) { |
| Object bean = ObjectHelper.newInstance(beanType); |
| return bean(bean, method); |
| } |
| |
| /** |
| * Creates the expression for invoking the bean type. |
| * |
| * @param bean the bean to invoke |
| * @param method optional name of method to invoke for instance to avoid ambiguity |
| * @return the expression |
| */ |
| public static Expression bean(Object bean, String method) { |
| BeanLanguage language = new BeanLanguage(); |
| return language.createExpression(bean, method); |
| } |
| |
| public Predicate createPredicate(String expression) { |
| return PredicateBuilder.toPredicate(createExpression(expression)); |
| } |
| |
| public Expression createExpression(String expression) { |
| ObjectHelper.notNull(expression, "expression"); |
| |
| String beanName = expression; |
| String method = null; |
| |
| // we support both the .method name and the ?method= syntax |
| // as the ?method= syntax is very common for the bean component |
| int idx = expression.lastIndexOf('.'); |
| if (idx > 0) { |
| beanName = expression.substring(0, idx); |
| method = expression.substring(idx + 1); |
| } else if (expression.contains("?method=")) { |
| beanName = ObjectHelper.before(expression, "?"); |
| method = ObjectHelper.after(expression, "?method="); |
| } |
| |
| return new BeanExpression(beanName, method); |
| } |
| |
| public Expression createExpression(Object bean, String method) { |
| ObjectHelper.notNull(bean, "bean"); |
| return new BeanExpression(bean, method); |
| } |
| |
| public boolean isSingleton() { |
| return true; |
| } |
| } |