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: 755890 $
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 public RegistryBean(CamelContext context, String name, ParameterMappingStrategy parameterMappingStrategy) {
047 this(context, name);
048 this.parameterMappingStrategy = parameterMappingStrategy;
049 }
050
051 @Override
052 public String toString() {
053 return "bean: " + name;
054 }
055
056 public ConstantBeanHolder createCacheHolder() throws Exception {
057 return new ConstantBeanHolder(getBean(), getBeanInfo());
058 }
059
060 public Object getBean() throws NoSuchBeanException {
061 Object value = lookupBean();
062 if (value == null) {
063 throw new NoSuchBeanException(name);
064 }
065 if (value != bean) {
066 bean = value;
067 processor = null;
068 if (!ObjectHelper.equal(ObjectHelper.type(bean), ObjectHelper.type(value))) {
069 beanInfo = null;
070 }
071 }
072 return value;
073 }
074
075 public Processor getProcessor() {
076 if (processor == null && bean != null) {
077 processor = CamelContextHelper.convertTo(context, Processor.class, bean);
078 }
079 return processor;
080 }
081
082 public BeanInfo getBeanInfo() {
083 if (beanInfo == null && bean != null) {
084 this.beanInfo = createBeanInfo();
085 }
086 return beanInfo;
087 }
088
089 public String getName() {
090 return name;
091 }
092
093 public Registry getRegistry() {
094 return registry;
095 }
096
097 public CamelContext getContext() {
098 return context;
099 }
100
101 public ParameterMappingStrategy getParameterMappingStrategy() {
102 if (parameterMappingStrategy == null) {
103 parameterMappingStrategy = createParameterMappingStrategy();
104 }
105 return parameterMappingStrategy;
106 }
107
108 public void setParameterMappingStrategy(ParameterMappingStrategy parameterMappingStrategy) {
109 this.parameterMappingStrategy = parameterMappingStrategy;
110 }
111
112 // Implementation methods
113 //-------------------------------------------------------------------------
114 protected BeanInfo createBeanInfo() {
115 return new BeanInfo(context, bean.getClass(), getParameterMappingStrategy());
116 }
117
118 protected ParameterMappingStrategy createParameterMappingStrategy() {
119 return BeanInfo.createParameterMappingStrategy(context);
120 }
121
122 protected Object lookupBean() {
123 return registry.lookup(name);
124 }
125 }