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ClassLoaderUtils.java | 0% | 0% | 0% | 0% |
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/*
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* ====================================================================
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*
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001-2003 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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*
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* 4. The names "The Jakarta Project", "Cactus" and "Apache Software
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* Foundation" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package org.apache.cactus.util;
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import java.util.Locale;
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import java.util.MissingResourceException;
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import java.util.PropertyResourceBundle;
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import java.util.ResourceBundle;
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/**
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* Utiliy methods related to class loading in a webapp environment.
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*
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* @author <a href="mailto:vmassol@apache.org">Vincent Massol</a>
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*
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* @version $Id: ClassLoaderUtils.java,v 1.7 2003/05/26 11:45:22 cmlenz Exp $
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*/
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public class ClassLoaderUtils |
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{ |
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/**
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* Try loading a class first by using the context class loader or by using
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* the classloader of the referrer class if the context classloader failed
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* to load the class.
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*
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* @param theClassName the name of the test class
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* @param theReferrer the class will be loaded using the classloader which
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* has loaded this referrer class
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* @return the class object the test class to call
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* @exception ClassNotFoundException if the class cannot be loaded through
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* either classloader
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*/
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public static Class loadClass(String theClassName, Class theReferrer) |
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throws ClassNotFoundException
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{ |
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// Get the class to call and build an instance of it.
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Class clazz = null;
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try
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{ |
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// try loading from webapp classloader first
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clazz = loadClassFromWebappClassLoader(theClassName, theReferrer); |
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} |
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catch (Throwable internalException)
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{ |
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// Then try first from Context class loader so that we can put the
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// Cactus jar as an external library.
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clazz = loadClassFromContextClassLoader(theClassName); |
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} |
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return clazz;
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} |
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/**
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* Try loading class using the Context class loader.
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*
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* @param theClassName the class to load
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* @return the <code>Class</code> object for the class to load
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* @exception ClassNotFoundException if the class cannot be loaded through
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* this class loader
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*/
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public static Class loadClassFromContextClassLoader(String theClassName) |
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throws ClassNotFoundException
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{ |
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return Class.forName(theClassName, true, |
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Thread.currentThread().getContextClassLoader()); |
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} |
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/**
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* Try loading class using the Webapp class loader.
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*
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* @param theClassName the class to load
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* @param theReferrer the class will be loaded using the classloader which
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* has loaded this referrer class
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* @return the <code>Class</code> object for the class to load
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* @exception ClassNotFoundException if the class cannot be loaded through
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* this class loader
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*/
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public static Class loadClassFromWebappClassLoader(String theClassName, |
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Class theReferrer) throws ClassNotFoundException
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{ |
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return Class.forName(theClassName, true, theReferrer.getClassLoader()); |
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} |
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/**
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* Try loading a resource bundle from either the context class loader or
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* the
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*
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* @param theName the resource bundle name
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* @param theReferrer the resource bundle will be loaded using the
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* classloader which has loaded this referrer class
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* @return the loaded resource bundle
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*/
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public static ResourceBundle loadPropertyResourceBundle(String theName, |
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Class theReferrer) |
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{ |
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ResourceBundle bundle; |
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try
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{ |
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// Try to load from the referrer class loader first
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// Some JDK implementation will return "null" when calling
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// getClassLoader(), signalling that the classloader is the
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// bootstrap class loader. However, getBundle() does not support
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// passing null for the class loader, hence the following test.
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if (theReferrer.getClassLoader() == null) |
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{ |
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bundle = PropertyResourceBundle.getBundle(theName, |
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Locale.getDefault()); |
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} |
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else
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{ |
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bundle = PropertyResourceBundle.getBundle(theName, |
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Locale.getDefault(), theReferrer.getClassLoader()); |
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} |
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} |
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catch (MissingResourceException e)
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{ |
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// Then, try to load from context classloader
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bundle = PropertyResourceBundle.getBundle(theName, |
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Locale.getDefault(), |
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Thread.currentThread().getContextClassLoader()); |
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} |
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return bundle;
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} |
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} |
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