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 */ 017package org.apache.camel.language.spel; 018 019import org.apache.camel.Expression; 020import org.apache.camel.Predicate; 021import org.apache.camel.Service; 022import org.apache.camel.spi.Language; 023import org.apache.camel.spring.SpringCamelContext; 024import org.apache.camel.spring.util.RegistryBeanResolver; 025import org.apache.camel.support.LanguageSupport; 026import org.apache.camel.util.ObjectHelper; 027import org.springframework.context.ApplicationContext; 028import org.springframework.context.expression.BeanFactoryResolver; 029import org.springframework.expression.BeanResolver; 030 031/** 032 * A Spring Expression {@link Language} plugin 033 */ 034public class SpelLanguage extends LanguageSupport implements Service { 035 036 private BeanResolver beanResolver; 037 038 public Predicate createPredicate(String expression) { 039 expression = loadResource(expression); 040 return new SpelExpression(expression, Boolean.class, beanResolver); 041 } 042 043 public Expression createExpression(String expression) { 044 expression = loadResource(expression); 045 return new SpelExpression(expression, Object.class, beanResolver); 046 } 047 048 @Override 049 public void start() throws Exception { 050 ObjectHelper.notNull(getCamelContext(), "CamelContext", this); 051 052 if (getCamelContext() instanceof SpringCamelContext) { 053 ApplicationContext applicationContext = ((SpringCamelContext) getCamelContext()).getApplicationContext(); 054 beanResolver = new BeanFactoryResolver(applicationContext); 055 } else { 056 beanResolver = new RegistryBeanResolver(getCamelContext().getRegistry()); 057 } 058 } 059 060 @Override 061 public void stop() throws Exception { 062 // noop 063 } 064}