Spring Framework example source code file (SingletonTargetSource.java)

This example Spring Framework source code file (SingletonTargetSource.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

class, io, object, object, serializable, singletontargetsource, singletontargetsource, string, target, target, targetsource, targetsource

The Spring Framework SingletonTargetSource.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.aop.target;

import java.io.Serializable;

import org.springframework.aop.TargetSource;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;

/**
 * Implementation of the {@link org.springframework.aop.TargetSource} interface
 * that holds a given object. This is the default implementation of the TargetSource
 * interface, as used by the Spring AOP framework. There is usually no need to
 * create objects of this class in application code.
 *
 * <p>This class is serializable. However, the actual serializability of a
 * SingletonTargetSource will depend on whether the target is serializable.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see org.springframework.aop.framework.AdvisedSupport#setTarget(Object)
 */
public class SingletonTargetSource implements TargetSource, Serializable {

	/** use serialVersionUID from Spring 1.2 for interoperability */
	private static final long serialVersionUID = 9031246629662423738L;


	/** Target cached and invoked using reflection */
	private final Object target;


	/**
	 * Create a new SingletonTargetSource for the given target.
	 * @param target the target object
	 */
	public SingletonTargetSource(Object target) {
		Assert.notNull(target, "Target object must not be null");
		this.target = target;
	}


	public Class getTargetClass() {
		return this.target.getClass();
	}
	
	public Object getTarget() {
		return this.target;
	}
	
	public void releaseTarget(Object target) {
		// nothing to do
	}

	public boolean isStatic() {
		return true;
	}


	/**
	 * Two invoker interceptors are equal if they have the same target or if the
	 * targets or the targets are equal.
	 */
	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}
		if (!(other instanceof SingletonTargetSource)) {
			return false;
		}
		SingletonTargetSource otherTargetSource = (SingletonTargetSource) other;
		return this.target.equals(otherTargetSource.target);
	}

	/**
	 * SingletonTargetSource uses the hash code of the target object.
	 */
	public int hashCode() {
		return this.target.hashCode();
	}

	public String toString() {
		return "SingletonTargetSource for target object [" + ObjectUtils.identityToString(this.target) + "]";
	}

}