/*
* $Id: ClassUtils.java 471754 2006-11-06 14:55:09Z husted $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.struts.chain.commands.util;
/**
* <p>Utility methods to load application classes and create instances.</p>
*
* @version $Rev: 471754 $ $Date: 2005-11-12 13:01:44 -0500 (Sat, 12 Nov 2005)
* $
*/
public final class ClassUtils {
// ---------------------------------------------------------- Static Methods
/**
* <p>Return the <code>Class</code> object for the specified fully
* qualified class name, from this web application's class loader.
*
* @param className Fully qualified class name
* @throws ClassNotFoundException if the specified class cannot be loaded
*/
public static Class getApplicationClass(String className)
throws ClassNotFoundException {
if (className == null) {
throw new NullPointerException(
"getApplicationClass called with null className");
}
ClassLoader classLoader =
Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
classLoader = ClassUtils.class.getClassLoader();
}
return (classLoader.loadClass(className));
}
/**
* <p>Return a new instance of the specified fully qualified class name,
* after loading the class (if necessary) from this web application's
* class loader.</p>
*
* @param className Fully qualified class name
* @throws ClassNotFoundException if the specified class cannot be loaded
* @throws IllegalAccessException if this class is not concrete
* @throws InstantiationException if this class has no zero-arguments
* constructor
*/
public static Object getApplicationInstance(String className)
throws ClassNotFoundException, IllegalAccessException,
InstantiationException {
return (getApplicationClass(className).newInstance());
}
}