SecurityActions.java

/*
 *    Constellation - An open source and standard compliant SDI
 *    http://www.constellation-sdi.org
 *
 * Copyright 2014 Geomatys.
 *
 * 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.constellation.xacml;

import java.io.InputStream;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
 

/**
 *  Privileged Blocks
 *  @author Anil.Saldhana@redhat.com
 *  @since  Jul 10, 2007 
 *  @version $Revision$
 */
public final class SecurityActions {

    private SecurityActions() {}
    
    /**
     * Obtain the Thread Context ClassLoader.
     */
    public static ClassLoader getContextClassLoader() {
        return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
            @Override
            public ClassLoader run() {
                return Thread.currentThread().getContextClassLoader();
            }
        });
    }
    
    
    /**
     * Return the URL of the specified resource 
     */
    public static URL getResource(String url) {
        final ClassLoader cl = getContextClassLoader();
        return cl.getResource(url);
    }
    
    /**
     * Return an input stream of the specified resource. 
     */
    public static InputStream getResourceAsStream(String url) {
        final ClassLoader cl = getContextClassLoader();
        return cl.getResourceAsStream(url);
    }
    
    /**
     * Return an input stream of the specified resource. 
     */
    public static Class<?> loadClass(String name) throws ClassNotFoundException {
        final ClassLoader cl = getContextClassLoader();
        return cl.loadClass(name);
    }
}