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.spring;
018    
019    import java.lang.reflect.Modifier;
020    import java.util.List;
021    import java.util.Map;
022    import java.util.Set;
023    
024    import org.apache.camel.builder.RouteBuilder;
025    import org.apache.camel.util.ResolverUtil;
026    
027    import org.springframework.context.ApplicationContext;
028    
029    /**
030     * A helper class which will find all {@link RouteBuilder} instances on the classpath
031     *
032     * @version $Revision: 563665 $
033     */
034    public class RouteBuilderFinder {
035        private final SpringCamelContext camelContext;
036        private final String[] packages;
037        private ApplicationContext applicationContext;
038        private ResolverUtil resolver = new ResolverUtil();
039    
040        public RouteBuilderFinder(SpringCamelContext camelContext, String[] packages) {
041            this.camelContext = camelContext;
042            this.applicationContext = camelContext.getApplicationContext();
043            this.packages = packages;
044        }
045    
046        public String[] getPackages() {
047            return packages;
048        }
049    
050        public ApplicationContext getApplicationContext() {
051            return applicationContext;
052        }
053    
054    
055        /**
056         * Appends all the {@link RouteBuilder} instances that can be found on the classpath
057         */
058        public void appendBuilders(List<RouteBuilder> list) throws IllegalAccessException, InstantiationException {
059            resolver.findImplementations(RouteBuilder.class, packages);
060            //resolver.findAnnotated(Endpoint.class, packages);
061            Set<Class> classes = resolver.getClasses();
062            for (Class aClass : classes) {
063                if (shouldIgnoreBean(aClass)) {
064                    continue;
065                }
066                if (isValidClass(aClass)) {
067                    RouteBuilder builder = instantiateBuilder(aClass);
068                    list.add(builder);
069                }
070            }
071        }
072    
073        public void destroy() throws Exception {
074        }
075    
076        /**
077         * Lets ignore beans that are not explicitly configured in the spring.xml
078         */
079        protected boolean shouldIgnoreBean(Class type) {
080            Map beans = applicationContext.getBeansOfType(type, true, true);
081            if (beans == null || beans.isEmpty()) {
082                return false;
083            }
084            // TODO apply some filter?
085            return true;
086        }
087    
088        /**
089         * Returns true if the object is non-abstract and supports a zero argument constructor
090         */
091        protected boolean isValidClass(Class type) {
092            if (!Modifier.isAbstract(type.getModifiers()) && !type.isInterface()) {
093                return true;
094            }
095            return false;
096        }
097    
098        protected RouteBuilder instantiateBuilder(Class type) throws IllegalAccessException, InstantiationException {
099            return (RouteBuilder) camelContext.getInjector().newInstance(type);
100        }
101    }