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.component.bean; 018 019import org.apache.camel.CamelContext; 020import org.apache.camel.NoSuchBeanException; 021import org.apache.camel.Processor; 022import org.apache.camel.spi.Registry; 023 024/** 025 * An implementation of a {@link BeanHolder} which will look up a bean from the registry and act as a cache of its metadata 026 * 027 * @version 028 */ 029public class RegistryBean implements BeanHolder { 030 private final CamelContext context; 031 private final String name; 032 private final Registry registry; 033 private volatile BeanInfo beanInfo; 034 private volatile Class<?> clazz; 035 private ParameterMappingStrategy parameterMappingStrategy; 036 037 public RegistryBean(CamelContext context, String name) { 038 this(context.getRegistry(), context, name); 039 } 040 041 public RegistryBean(Registry registry, CamelContext context, String name) { 042 this.registry = registry; 043 this.context = context; 044 if (name != null) { 045 // for ref it may have "ref:" or "bean:" as prefix by mistake 046 if (name.startsWith("ref:")) { 047 this.name = name.substring(4); 048 } else if (name.startsWith("bean:")) { 049 this.name = name.substring(5); 050 } else { 051 this.name = name; 052 } 053 } else { 054 this.name = null; 055 } 056 } 057 058 @Override 059 public String toString() { 060 return "bean: " + name; 061 } 062 063 /** 064 * Creates a cached and constant {@link org.apache.camel.component.bean.BeanHolder} from this holder. 065 * 066 * @return a new {@link org.apache.camel.component.bean.BeanHolder} that has cached the lookup of the bean. 067 */ 068 public ConstantBeanHolder createCacheHolder() { 069 Object bean = getBean(); 070 BeanInfo info = createBeanInfo(bean); 071 return new ConstantBeanHolder(bean, info); 072 } 073 074 public Object getBean() throws NoSuchBeanException { 075 // must always lookup bean first 076 Object value = lookupBean(); 077 078 if (value != null) { 079 // could be a class then create an instance of it 080 if (value instanceof Class) { 081 // bean is a class so create an instance of it 082 value = context.getInjector().newInstance((Class<?>)value); 083 } 084 return value; 085 } 086 087 // okay bean is not in registry, so try to resolve if its a class name and create a shared instance 088 if (clazz == null) { 089 clazz = context.getClassResolver().resolveClass(name); 090 } 091 092 if (clazz == null) { 093 // no its not a class then we cannot find the bean 094 throw new NoSuchBeanException(name); 095 } 096 097 // bean is a class so create an instance of it 098 return context.getInjector().newInstance(clazz); 099 } 100 101 public Processor getProcessor() { 102 return null; 103 } 104 105 public boolean supportProcessor() { 106 return false; 107 } 108 109 public BeanInfo getBeanInfo() { 110 if (beanInfo == null) { 111 Object bean = getBean(); 112 this.beanInfo = createBeanInfo(bean); 113 } 114 return beanInfo; 115 } 116 117 public BeanInfo getBeanInfo(Object bean) { 118 return createBeanInfo(bean); 119 } 120 121 public String getName() { 122 return name; 123 } 124 125 public Registry getRegistry() { 126 return registry; 127 } 128 129 public CamelContext getContext() { 130 return context; 131 } 132 133 public ParameterMappingStrategy getParameterMappingStrategy() { 134 if (parameterMappingStrategy == null) { 135 parameterMappingStrategy = createParameterMappingStrategy(); 136 } 137 return parameterMappingStrategy; 138 } 139 140 public void setParameterMappingStrategy(ParameterMappingStrategy parameterMappingStrategy) { 141 this.parameterMappingStrategy = parameterMappingStrategy; 142 } 143 144 // Implementation methods 145 //------------------------------------------------------------------------- 146 protected BeanInfo createBeanInfo(Object bean) { 147 return new BeanInfo(context, bean.getClass(), getParameterMappingStrategy()); 148 } 149 150 protected ParameterMappingStrategy createParameterMappingStrategy() { 151 return BeanInfo.createParameterMappingStrategy(context); 152 } 153 154 protected Object lookupBean() { 155 return registry.lookupByName(name); 156 } 157}