| ClassUtils.java |
/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Axis" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.jboss.axis.utils;
import java.io.InputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Utility methods for Class Loading.
*
* @author Davanum Srinvas (dims@yahoo.com)
*/
public final class ClassUtils
{
// [TDI] static caching of classloaders won't work in JBoss
//private static Hashtable classloaders = new Hashtable();
/**
* Set the ClassLoader associated with the given className.
*
* @param className the name of a class
*/
public static void setClassLoader(String className, ClassLoader loader)
{
// [TDI] static caching of classloaders won't work in JBoss
// if (className != null && loader != null)
// classloaders.put(className, loader);
}
/**
* Obtain the ClassLoader (if any) associated with the given
* className.
*
* @param className the name of a class
* @return class loader
*/
public static ClassLoader getClassLoader(String className)
{
// [TDI] static caching of classloaders won't work in JBoss
//if (className == null) return null;
//return (ClassLoader)classloaders.get(className);
return null;
}
/**
* Deregister the ClassLoader for a given className.
*
* @param className the name of a class
*/
public static void removeClassLoader(String className)
{
// [TDI] static caching of classloaders won't work in JBoss
//classloaders.remove(className);
}
/**
* Use this method instead of Class.forName
*
* @param className Class name
* @return java class
* @throws ClassNotFoundException if the class is not found
*/
public static Class forName(String className)
throws ClassNotFoundException
{
return loadClass(className);
}
/** Use this method instead of Class.forName (String className, boolean init, ClassLoader loader)
*/
public static Class forName(String _className, boolean init, ClassLoader _loader)
throws ClassNotFoundException
{
// Create final vars for doPrivileged block
final String className = _className;
final ClassLoader loader = _loader;
try
{
// Get the class within a doPrivleged block
Object ret =
AccessController.doPrivileged(new PrivilegedAction()
{
public Object run()
{
try
{
return Class.forName(className, true, loader);
}
catch (Throwable e)
{
return e;
}
}
});
// If the class was located, return it. Otherwise throw exception
if (ret instanceof Class)
{
return (Class)ret;
}
else if (ret instanceof ClassNotFoundException)
{
throw (ClassNotFoundException)ret;
}
else
{
throw new ClassNotFoundException(_className);
}
}
catch (ClassNotFoundException cnfe)
{
return loadClass(className);
}
}
/** Loads the class from the context class loader and then falls back to Class.forName
*/
private static Class loadClass(String _className)
throws ClassNotFoundException
{
// Create final vars for doPrivileged block
final String className = _className;
// Get the class within a doPrivleged block
Object ret =
AccessController.doPrivileged(new PrivilegedAction()
{
public Object run()
{
try
{
// Check if the class is a registered class then
// use the classloader for that class.
ClassLoader classLoader = getClassLoader(className);
return Class.forName(className, true, classLoader);
}
catch (ClassNotFoundException cnfe)
{
}
try
{
// Try the context class loader
ClassLoader classLoader =
Thread.currentThread().getContextClassLoader();
return Class.forName(className, true, classLoader);
}
catch (ClassNotFoundException cnfe2)
{
try
{
// Try the classloader that loaded this class.
ClassLoader classLoader =
ClassUtils.class.getClassLoader();
return Class.forName(className, true, classLoader);
}
catch (ClassNotFoundException cnfe3)
{
// Try the default class loader.
try
{
return Class.forName(className);
}
catch (Throwable e)
{
// Still not found, return exception
return e;
}
}
}
}
});
// If the class was located, return it. Otherwise throw exception
if (ret instanceof Class)
{
return (Class)ret;
}
else if (ret instanceof ClassNotFoundException)
{
throw (ClassNotFoundException)ret;
}
else
{
throw new ClassNotFoundException(_className);
}
}
public static InputStream getResourceAsStream(Class clazz, String resource)
{
InputStream myInputStream = null;
if (clazz.getClassLoader() != null)
{
// Try the class loader that loaded this class.
myInputStream = clazz.getClassLoader().getResourceAsStream(resource);
}
else
{
// Try the system class loader.
myInputStream = ClassLoader.getSystemClassLoader().getResourceAsStream(resource);
}
if (myInputStream == null)
{
// if not found in classpath fall back to default
myInputStream = clazz.getResourceAsStream(resource);
}
return myInputStream;
}
}
| ClassUtils.java |