org.springframework.beans.factory.support.ReplaceOverride.java Source code

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Here is the source code for org.springframework.beans.factory.support.ReplaceOverride.java

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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.beans.factory.support;

import java.lang.reflect.Method;
import java.util.LinkedList;
import java.util.List;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;

/**
 * Extension of MethodOverride that represents an arbitrary
 * override of a method by the IoC container.
 *
 * <p>Any non-final method can be overridden, irrespective of its
 * parameters and return types.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 1.1
 */
public class ReplaceOverride extends MethodOverride {

    private final String methodReplacerBeanName;

    private List<String> typeIdentifiers = new LinkedList<>();

    /**
     * Construct a new ReplaceOverride.
     * @param methodName the name of the method to override
     * @param methodReplacerBeanName the bean name of the MethodReplacer
     */
    public ReplaceOverride(String methodName, String methodReplacerBeanName) {
        super(methodName);
        Assert.notNull(methodName, "Method replacer bean name must not be null");
        this.methodReplacerBeanName = methodReplacerBeanName;
    }

    /**
     * Return the name of the bean implementing MethodReplacer.
     */
    public String getMethodReplacerBeanName() {
        return this.methodReplacerBeanName;
    }

    /**
     * Add a fragment of a class string, like "Exception"
     * or "java.lang.Exc", to identify a parameter type.
     * @param identifier a substring of the fully qualified class name
     */
    public void addTypeIdentifier(String identifier) {
        this.typeIdentifiers.add(identifier);
    }

    @Override
    public boolean matches(Method method) {
        if (!method.getName().equals(getMethodName())) {
            return false;
        }
        if (!isOverloaded()) {
            // Not overloaded: don't worry about arg type matching...
            return true;
        }
        // If we get here, we need to insist on precise argument matching...
        if (this.typeIdentifiers.size() != method.getParameterCount()) {
            return false;
        }
        Class<?>[] parameterTypes = method.getParameterTypes();
        for (int i = 0; i < this.typeIdentifiers.size(); i++) {
            String identifier = this.typeIdentifiers.get(i);
            if (!parameterTypes[i].getName().contains(identifier)) {
                return false;
            }
        }
        return true;
    }

    @Override
    public boolean equals(@Nullable Object other) {
        if (!(other instanceof ReplaceOverride) || !super.equals(other)) {
            return false;
        }
        ReplaceOverride that = (ReplaceOverride) other;
        return (ObjectUtils.nullSafeEquals(this.methodReplacerBeanName, that.methodReplacerBeanName)
                && ObjectUtils.nullSafeEquals(this.typeIdentifiers, that.typeIdentifiers));
    }

    @Override
    public int hashCode() {
        int hashCode = super.hashCode();
        hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.methodReplacerBeanName);
        hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.typeIdentifiers);
        return hashCode;
    }

    @Override
    public String toString() {
        return "Replace override for method '" + getMethodName() + "'";
    }

}