001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau; 014 015import static org.apache.juneau.internal.ClassUtils.*; 016 017import java.lang.reflect.*; 018import java.util.*; 019 020import org.apache.juneau.json.*; 021 022/** 023 * Provides an {@link InvocationHandler} for creating beans from bean interfaces. 024 * 025 * <p> 026 * If the {@code useInterfaceProxies} setting is enabled in {@link BeanContext}, this is the class that creates 027 * instances of beans from interfaces. 028 * 029 * @param <T> The interface class 030 */ 031public class BeanProxyInvocationHandler<T> implements InvocationHandler { 032 033 private final BeanMeta<T> meta; // The BeanMeta for this instance 034 private Map<String, Object> beanProps; // The map of property names to bean property values. 035 036 /** 037 * Constructs with the specified {@link BeanMeta}. 038 * 039 * @param meta The bean meta data. 040 */ 041 public BeanProxyInvocationHandler(BeanMeta<T> meta) { 042 this.meta = meta; 043 this.beanProps = new HashMap<>(); 044 } 045 046 /** 047 * Implemented to handle the method called. 048 */ 049 @Override /* InvocationHandler */ 050 public Object invoke(Object proxy, Method method, Object[] args) { 051 Class<?>[] paramTypes = method.getParameterTypes(); 052 if (hasName(method, "equals") && hasArgs(method, java.lang.Object.class)) { 053 Object arg = args[0]; 054 if (arg == null) 055 return false; 056 if (proxy == arg) 057 return true; 058 if (proxy.getClass() == arg.getClass()) { 059 InvocationHandler ih = Proxy.getInvocationHandler(arg); 060 if (ih instanceof BeanProxyInvocationHandler) { 061 return this.beanProps.equals(((BeanProxyInvocationHandler<?>)ih).beanProps); 062 } 063 } 064 BeanMap<Object> bean = this.meta.ctx.createSession().toBeanMap(arg); 065 return this.beanProps.equals(bean); 066 } 067 068 if (hasName(method, "hashCode") && (paramTypes.length == 0)) 069 return Integer.valueOf(this.beanProps.hashCode()); 070 071 if (hasName(method, "toString") && (paramTypes.length == 0)) 072 return SimpleJsonSerializer.DEFAULT.toString(this.beanProps); 073 074 String prop = this.meta.getterProps.get(method); 075 if (prop != null) 076 return this.beanProps.get(prop); 077 078 prop = this.meta.setterProps.get(method); 079 if (prop != null) { 080 this.beanProps.put(prop, args[0]); 081 return null; 082 } 083 084 throw new UnsupportedOperationException("Unsupported bean method. method=[ " + method + " ]"); 085 } 086}