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Spring Framework example source code file (MethodOverride.java)

This example Spring Framework source code file (MethodOverride.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

beanmetadataelement, beanmetadataelement, method, methodoverride, methodoverride, object, object, reflection, string, string

The Spring Framework MethodOverride.java source code

/*
 * Copyright 2002-2007 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
 *
 *      http://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 org.springframework.beans.BeanMetadataElement;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;

/**
 * Object representing the override of a method on a managed
 * object by the IoC container.
 *
 * <p>Note that the override mechanism is not intended as a
 * generic means of inserting crosscutting code: use AOP for that.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 1.1
 */
public abstract class MethodOverride implements BeanMetadataElement {
	
	private final String methodName;

	private boolean overloaded = true;

	private Object source;


	/**
	 * Construct a new override for the given method.
	 * @param methodName the name of the method to override
	 */
	protected MethodOverride(String methodName) {
		Assert.notNull(methodName, "Method name must not be null");
		this.methodName = methodName;
	}

	/**
	 * Return the name of the method to be overridden.
	 */
	public String getMethodName() {
		return this.methodName;
	}

	/**
	 * Set whether the overridden method has to be considered as overloaded
	 * (that is, whether arg type matching has to happen).
	 * <p>Default is "true"; can be switched to "false" to optimize runtime performance.
	 */
	protected void setOverloaded(boolean overloaded) {
		this.overloaded = overloaded;
	}

	/**
	 * Return whether the overridden method has to be considered as overloaded
	 * (that is, whether arg type matching has to happen).
	 */
	protected boolean isOverloaded() {
		return this.overloaded;
	}

	/**
	 * Set the configuration source <code>Object for this metadata element.
	 * <p>The exact type of the object will depend on the configuration mechanism used.
	 */
	public void setSource(Object source) {
		this.source = source;
	}

	public Object getSource() {
		return this.source;
	}


	/**
	 * Subclasses must override this to indicate whether they match
	 * the given method. This allows for argument list checking
	 * as well as method name checking.
	 * @param method the method to check
	 * @return whether this override matches the given method
	 */
	public abstract boolean matches(Method method);


	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}
		if (!(other instanceof MethodOverride)) {
			return false;
		}
		MethodOverride that = (MethodOverride) other;
		return (ObjectUtils.nullSafeEquals(this.methodName, that.methodName) &&
				this.overloaded == that.overloaded &&
				ObjectUtils.nullSafeEquals(this.source, that.source));
	}

	public int hashCode() {
		int hashCode = ObjectUtils.nullSafeHashCode(this.methodName);
		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.source);
		hashCode = 29 * hashCode + (this.overloaded ? 1 : 0);
		return hashCode;
	}

}

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