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.LinkedList;
021import java.util.List;
022
023import org.springframework.util.Assert;
024import org.springframework.util.ObjectUtils;
025
026/**
027 * Extension of MethodOverride that represents an arbitrary
028 * override of a method by the IoC container.
029 *
030 * <p>Any non-final method can be overridden, irrespective of its
031 * parameters and return types.
032 *
033 * @author Rod Johnson
034 * @author Juergen Hoeller
035 * @since 1.1
036 */
037public class ReplaceOverride extends MethodOverride {
038
039        private final String methodReplacerBeanName;
040
041        private final List<String> typeIdentifiers = new LinkedList<String>();
042
043
044        /**
045         * Construct a new ReplaceOverride.
046         * @param methodName the name of the method to override
047         * @param methodReplacerBeanName the bean name of the MethodReplacer
048         */
049        public ReplaceOverride(String methodName, String methodReplacerBeanName) {
050                super(methodName);
051                Assert.notNull(methodReplacerBeanName, "Method replacer bean name must not be null");
052                this.methodReplacerBeanName = methodReplacerBeanName;
053        }
054
055
056        /**
057         * Return the name of the bean implementing MethodReplacer.
058         */
059        public String getMethodReplacerBeanName() {
060                return this.methodReplacerBeanName;
061        }
062
063        /**
064         * Add a fragment of a class string, like "Exception"
065         * or "java.lang.Exc", to identify a parameter type.
066         * @param identifier a substring of the fully qualified class name
067         */
068        public void addTypeIdentifier(String identifier) {
069                this.typeIdentifiers.add(identifier);
070        }
071
072
073        @Override
074        public boolean matches(Method method) {
075                if (!method.getName().equals(getMethodName())) {
076                        return false;
077                }
078                if (!isOverloaded()) {
079                        // Not overloaded: don't worry about arg type matching...
080                        return true;
081                }
082                // If we get here, we need to insist on precise argument matching...
083                Class<?>[] parameterTypes = method.getParameterTypes();
084                if (this.typeIdentifiers.size() != parameterTypes.length) {
085                        return false;
086                }
087                for (int i = 0; i < this.typeIdentifiers.size(); i++) {
088                        String identifier = this.typeIdentifiers.get(i);
089                        if (!parameterTypes[i].getName().contains(identifier)) {
090                                return false;
091                        }
092                }
093                return true;
094        }
095
096
097        @Override
098        public boolean equals(Object other) {
099                if (!(other instanceof ReplaceOverride) || !super.equals(other)) {
100                        return false;
101                }
102                ReplaceOverride that = (ReplaceOverride) other;
103                return (ObjectUtils.nullSafeEquals(this.methodReplacerBeanName, that.methodReplacerBeanName) &&
104                                ObjectUtils.nullSafeEquals(this.typeIdentifiers, that.typeIdentifiers));
105        }
106
107        @Override
108        public int hashCode() {
109                int hashCode = super.hashCode();
110                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.methodReplacerBeanName);
111                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.typeIdentifiers);
112                return hashCode;
113        }
114
115        @Override
116        public String toString() {
117                return "Replace override for method '" + getMethodName() + "'";
118        }
119
120}