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.component.bean;
018
019 import org.apache.camel.CamelContext;
020 import org.apache.camel.NoSuchBeanException;
021 import org.apache.camel.Processor;
022 import org.apache.camel.spi.Registry;
023 import org.apache.camel.util.CamelContextHelper;
024 import org.apache.camel.util.ObjectHelper;
025
026 /**
027 * An implementation of a {@link BeanHolder} which will look up a bean from the registry and act as a cache of its metadata
028 *
029 * @version $Revision: 835276 $
030 */
031 public class RegistryBean implements BeanHolder {
032 private final CamelContext context;
033 private final String name;
034 private final Registry registry;
035 private Processor processor;
036 private BeanInfo beanInfo;
037 private Object bean;
038 private ParameterMappingStrategy parameterMappingStrategy;
039
040 public RegistryBean(CamelContext context, String name) {
041 this.context = context;
042 this.name = name;
043 this.registry = context.getRegistry();
044 }
045
046 @Override
047 public String toString() {
048 return "bean: " + name;
049 }
050
051 public ConstantBeanHolder createCacheHolder() throws Exception {
052 return new ConstantBeanHolder(getBean(), getBeanInfo());
053 }
054
055 public Object getBean() throws NoSuchBeanException {
056 Object value = lookupBean();
057 if (value == null) {
058 throw new NoSuchBeanException(name);
059 }
060 if (value != bean) {
061 bean = value;
062 processor = null;
063 if (!ObjectHelper.equal(ObjectHelper.type(bean), ObjectHelper.type(value))) {
064 beanInfo = null;
065 }
066
067 // could be a class then create an instance of it
068 if (bean instanceof Class) {
069 // bean is a class so create an instance of it
070 bean = context.getInjector().newInstance((Class<?>)bean);
071 value = bean;
072 }
073 }
074 return value;
075 }
076
077 public Processor getProcessor() {
078 if (processor == null && bean != null) {
079 processor = CamelContextHelper.convertTo(context, Processor.class, bean);
080 }
081 return processor;
082 }
083
084 public BeanInfo getBeanInfo() {
085 if (beanInfo == null && bean != null) {
086 this.beanInfo = createBeanInfo();
087 }
088 return beanInfo;
089 }
090
091 public String getName() {
092 return name;
093 }
094
095 public Registry getRegistry() {
096 return registry;
097 }
098
099 public CamelContext getContext() {
100 return context;
101 }
102
103 public ParameterMappingStrategy getParameterMappingStrategy() {
104 if (parameterMappingStrategy == null) {
105 parameterMappingStrategy = createParameterMappingStrategy();
106 }
107 return parameterMappingStrategy;
108 }
109
110 public void setParameterMappingStrategy(ParameterMappingStrategy parameterMappingStrategy) {
111 this.parameterMappingStrategy = parameterMappingStrategy;
112 }
113
114 // Implementation methods
115 //-------------------------------------------------------------------------
116 protected BeanInfo createBeanInfo() {
117 return new BeanInfo(context, bean.getClass(), getParameterMappingStrategy());
118 }
119
120 protected ParameterMappingStrategy createParameterMappingStrategy() {
121 return BeanInfo.createParameterMappingStrategy(context);
122 }
123
124 protected Object lookupBean() {
125 return registry.lookup(name);
126 }
127 }