Spring Framework example source code file (NullChecker.java)

This example Spring Framework source code file (NullChecker.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

illegalargumentexception, methodbeforeadvice, methodbeforeadvice, null, nullchecker, nullchecker, object, object, reflection, throwable, throwable

The Spring Framework NullChecker.java source code

/*
 * Copyright 2002-2006 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.framework.autoproxy;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

/**
 * @author Dave Syer
 */
public class NullChecker implements MethodBeforeAdvice {

	public void before(Method method, Object[] args, Object target) throws Throwable {
		check(args);
	}

	private void check(Object[] args) {
		for (int i = 0; i < args.length; i++) {
			if (args[i] == null) {
				throw new IllegalArgumentException("Null argument at position " + i);
			}
		}
	}

}