001/* 002 * Copyright 2002-2020 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans.factory.support; 018 019import java.lang.reflect.Method; 020import java.util.ArrayList; 021import java.util.List; 022 023import org.springframework.lang.Nullable; 024import org.springframework.util.Assert; 025import org.springframework.util.ObjectUtils; 026 027/** 028 * Extension of MethodOverride that represents an arbitrary 029 * override of a method by the IoC container. 030 * 031 * <p>Any non-final method can be overridden, irrespective of its 032 * parameters and return types. 033 * 034 * @author Rod Johnson 035 * @author Juergen Hoeller 036 * @since 1.1 037 */ 038public class ReplaceOverride extends MethodOverride { 039 040 private final String methodReplacerBeanName; 041 042 private final List<String> typeIdentifiers = new ArrayList<>(); 043 044 045 /** 046 * Construct a new ReplaceOverride. 047 * @param methodName the name of the method to override 048 * @param methodReplacerBeanName the bean name of the MethodReplacer 049 */ 050 public ReplaceOverride(String methodName, String methodReplacerBeanName) { 051 super(methodName); 052 Assert.notNull(methodReplacerBeanName, "Method replacer bean name must not be null"); 053 this.methodReplacerBeanName = methodReplacerBeanName; 054 } 055 056 057 /** 058 * Return the name of the bean implementing MethodReplacer. 059 */ 060 public String getMethodReplacerBeanName() { 061 return this.methodReplacerBeanName; 062 } 063 064 /** 065 * Add a fragment of a class string, like "Exception" 066 * or "java.lang.Exc", to identify a parameter type. 067 * @param identifier a substring of the fully qualified class name 068 */ 069 public void addTypeIdentifier(String identifier) { 070 this.typeIdentifiers.add(identifier); 071 } 072 073 074 @Override 075 public boolean matches(Method method) { 076 if (!method.getName().equals(getMethodName())) { 077 return false; 078 } 079 if (!isOverloaded()) { 080 // Not overloaded: don't worry about arg type matching... 081 return true; 082 } 083 // If we get here, we need to insist on precise argument matching... 084 if (this.typeIdentifiers.size() != method.getParameterCount()) { 085 return false; 086 } 087 Class<?>[] parameterTypes = method.getParameterTypes(); 088 for (int i = 0; i < this.typeIdentifiers.size(); i++) { 089 String identifier = this.typeIdentifiers.get(i); 090 if (!parameterTypes[i].getName().contains(identifier)) { 091 return false; 092 } 093 } 094 return true; 095 } 096 097 098 @Override 099 public boolean equals(@Nullable Object other) { 100 if (!(other instanceof ReplaceOverride) || !super.equals(other)) { 101 return false; 102 } 103 ReplaceOverride that = (ReplaceOverride) other; 104 return (ObjectUtils.nullSafeEquals(this.methodReplacerBeanName, that.methodReplacerBeanName) && 105 ObjectUtils.nullSafeEquals(this.typeIdentifiers, that.typeIdentifiers)); 106 } 107 108 @Override 109 public int hashCode() { 110 int hashCode = super.hashCode(); 111 hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.methodReplacerBeanName); 112 hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.typeIdentifiers); 113 return hashCode; 114 } 115 116 @Override 117 public String toString() { 118 return "Replace override for method '" + getMethodName() + "'"; 119 } 120 121}