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.StaticService;
022import org.apache.camel.spi.annotations.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 org.apache.camel.spi.Language} plugin
033 */
034@Language("spel")
035public class SpelLanguage extends LanguageSupport implements StaticService {
036
037    private BeanResolver beanResolver;
038
039    @Override
040    public Predicate createPredicate(String expression) {
041        expression = loadResource(expression);
042        Predicate answer = new SpelExpression(expression, Boolean.class, beanResolver);
043        answer.init(getCamelContext());
044        return answer;
045    }
046
047    @Override
048    public Expression createExpression(String expression) {
049        expression = loadResource(expression);
050        Expression answer = new SpelExpression(expression, Object.class, beanResolver);
051        answer.init(getCamelContext());
052        return answer;
053    }
054
055    @Override
056    public void init() {
057        ObjectHelper.notNull(getCamelContext(), "CamelContext", this);
058
059        if (getCamelContext() instanceof SpringCamelContext) {
060            ApplicationContext applicationContext = ((SpringCamelContext) getCamelContext()).getApplicationContext();
061            beanResolver = new BeanFactoryResolver(applicationContext);
062        } else {
063            beanResolver = new RegistryBeanResolver(getCamelContext().getRegistry());
064        }
065    }
066
067    @Override
068    public void start() {
069        // noop
070    }
071
072    @Override
073    public void stop() {
074        // noop
075    }
076}