ClassLoaderUtils.java

/*
 * 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.axis2.jaxws.util;

import org.apache.axis2.java.security.AccessController;
import org.apache.axis2.jaxws.ExceptionFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

/**
 * @deprecated - Security Risk. Please don't use this class, As a general rule
 * end user code should not be able to access AccessController.doPrivileged  
 */
public class ClassLoaderUtils {

    private static final Log log = LogFactory.getLog(ClassLoaderUtils.class);

    /**
     * @return ClassLoader
     */
    public static ClassLoader getClassLoader(final Class cls) {
        ClassLoader cl = null;
        try {
            cl = (ClassLoader) AccessController.doPrivileged(
                    new PrivilegedExceptionAction() {
                        public Object run() throws ClassNotFoundException {
                            return cls.getClassLoader();
                        }
                    }
            );
        } catch (PrivilegedActionException e) {
            if (log.isDebugEnabled()) {
                log.debug("Exception thrown from AccessController: " + e);
            }
            throw ExceptionFactory.makeWebServiceException(e.getException());
        }

        return cl;
    }

    /**
     * @return ClassLoader
     */
    public static ClassLoader getContextClassLoader(final ClassLoader classLoader) {
        ClassLoader cl;
        try {
            cl = (ClassLoader) AccessController.doPrivileged(
                    new PrivilegedExceptionAction() {
                        public Object run() throws ClassNotFoundException {
                            return classLoader != null ? classLoader : Thread.currentThread().getContextClassLoader();
                        }
                    }
            );
        } catch (PrivilegedActionException e) {
            if (log.isDebugEnabled()) {
                log.debug("Exception thrown from AccessController: " + e.getMessage(), e);
            }
            throw ExceptionFactory.makeWebServiceException(e.getException());
        }

        return cl;
    }

    /**
     * Return the class for this name
     *
     * @return Class
     */
    public static Class forName(final String className, final boolean initialize,
                                final ClassLoader classloader) throws ClassNotFoundException {
        Class cl = null;
        try {
            cl = (Class) AccessController.doPrivileged(
                    new PrivilegedExceptionAction() {
                        public Object run() throws ClassNotFoundException {
                            return Class.forName(className, initialize, classloader);
                        }
                    }
            );
        } catch (PrivilegedActionException e) {
            if (log.isDebugEnabled()) {
                log.debug("Exception thrown from AccessController: " + e.getMessage(), e);
            }
            throw (ClassNotFoundException) e.getException();
        }

        return cl;
    }

    /**
     * Return the class for this name
     *
     * @return Class
     */
    public static Class forName(final String className) throws ClassNotFoundException {
        Class cl = null;
        try {
            cl = (Class) AccessController.doPrivileged(
                    new PrivilegedExceptionAction() {
                        public Object run() throws ClassNotFoundException {
                            return Class.forName(className);
                        }
                    }
            );
        } catch (PrivilegedActionException e) {
            if (log.isDebugEnabled()) {
                log.debug("Exception thrown from AccessController: " + e.getMessage(), e);
            }
            throw (ClassNotFoundException) e.getException();
        }

        return cl;
    }

}