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 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(Registry registry, CamelContext context, String name) { 047 this.registry = registry; 048 this.context = context; 049 this.name = name; 050 } 051 052 @Override 053 public String toString() { 054 return "bean: " + name; 055 } 056 057 public ConstantBeanHolder createCacheHolder() throws Exception { 058 return new ConstantBeanHolder(getBean(), getBeanInfo()); 059 } 060 061 public synchronized Object getBean() throws NoSuchBeanException { 062 Object value = lookupBean(); 063 if (value == null) { 064 // maybe its a class 065 value = context.getClassResolver().resolveClass(name); 066 if (value == null) { 067 // no its not a class then we cannot find the bean 068 throw new NoSuchBeanException(name); 069 } 070 } 071 if (value != bean) { 072 if (!ObjectHelper.equal(ObjectHelper.type(bean), ObjectHelper.type(value))) { 073 beanInfo = null; 074 } 075 bean = value; 076 processor = null; 077 078 // could be a class then create an instance of it 079 if (bean instanceof Class) { 080 // bean is a class so create an instance of it 081 bean = context.getInjector().newInstance((Class<?>)bean); 082 value = bean; 083 } 084 } 085 return value; 086 } 087 088 public Processor getProcessor() { 089 if (processor == null && bean != null) { 090 processor = CamelContextHelper.convertTo(context, Processor.class, bean); 091 } 092 return processor; 093 } 094 095 public BeanInfo getBeanInfo() { 096 if (beanInfo == null && bean != null) { 097 this.beanInfo = createBeanInfo(); 098 } 099 return beanInfo; 100 } 101 102 public String getName() { 103 return name; 104 } 105 106 public Registry getRegistry() { 107 return registry; 108 } 109 110 public CamelContext getContext() { 111 return context; 112 } 113 114 public ParameterMappingStrategy getParameterMappingStrategy() { 115 if (parameterMappingStrategy == null) { 116 parameterMappingStrategy = createParameterMappingStrategy(); 117 } 118 return parameterMappingStrategy; 119 } 120 121 public void setParameterMappingStrategy(ParameterMappingStrategy parameterMappingStrategy) { 122 this.parameterMappingStrategy = parameterMappingStrategy; 123 } 124 125 // Implementation methods 126 //------------------------------------------------------------------------- 127 protected BeanInfo createBeanInfo() { 128 return new BeanInfo(context, bean.getClass(), getParameterMappingStrategy()); 129 } 130 131 protected ParameterMappingStrategy createParameterMappingStrategy() { 132 return BeanInfo.createParameterMappingStrategy(context); 133 } 134 135 protected Object lookupBean() { 136 return registry.lookup(name); 137 } 138 }