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PicketLink Common Code
There is a newer version: 3.0.0.Beta2
/*
 * JBoss, Home of Professional Open Source
 *
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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.picketlink.common.util;

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

/**
 * Privileged Blocks
 *
 * @author [email protected]
 * @since Dec 9, 2008
 */
class SecurityActions {

    /**
     *  Loads a {@link Class} using the fullQualifiedName supplied. This method tries first to load from
     * the specified {@link Class}, if not found it will try to load from using TCL. 
     *
     * @param theClass
     * @param fullQualifiedName
     *
     * @return
     */
    static Class loadClass(final Class theClass, final String fullQualifiedName) {
        SecurityManager sm = System.getSecurityManager();

        if (sm != null) {
            return AccessController.doPrivileged(new PrivilegedAction>() {
                public Class run() {
                    ClassLoader classLoader = theClass.getClassLoader();

                    Class clazz = loadClass(classLoader, fullQualifiedName);
                    if (clazz == null) {
                        classLoader = Thread.currentThread().getContextClassLoader();
                        clazz = loadClass(classLoader, fullQualifiedName);
                    }
                    return clazz;
                }
            });
        } else {
            ClassLoader classLoader = theClass.getClassLoader();

            Class clazz = loadClass(classLoader, fullQualifiedName);
            if (clazz == null) {
                classLoader = Thread.currentThread().getContextClassLoader();
                clazz = loadClass(classLoader, fullQualifiedName);
            }
            return clazz;
        }
    }

    /**
     *  Loads a class from the specified {@link ClassLoader} using the fullQualifiedName supplied. 
     *
     * @param classLoader
     * @param fullQualifiedName
     *
     * @return
     */
    static Class loadClass(final ClassLoader classLoader, final String fullQualifiedName) {
        SecurityManager sm = System.getSecurityManager();

        if (sm != null) {
            return AccessController.doPrivileged(new PrivilegedAction>() {
                public Class run() {
                    try {
                        return classLoader.loadClass(fullQualifiedName);
                    } catch (ClassNotFoundException e) {
                    }
                    return null;
                }
            });
        } else {
            try {
                return classLoader.loadClass(fullQualifiedName);
            } catch (ClassNotFoundException e) {
            }
            return null;
        }
    }

    /**
     * Load a resource based on the passed {@link Class} classloader. Failing which try with the Thread Context CL
     *
     * @param clazz
     * @param resourceName
     *
     * @return
     */
    static URL loadResource(final Class clazz, final String resourceName) {
        SecurityManager sm = System.getSecurityManager();

        if (sm != null) {
            return AccessController.doPrivileged(new PrivilegedAction() {
                public URL run() {
                    URL url = null;
                    ClassLoader clazzLoader = clazz.getClassLoader();
                    url = clazzLoader.getResource(resourceName);

                    if (url == null) {
                        clazzLoader = Thread.currentThread().getContextClassLoader();
                        url = clazzLoader.getResource(resourceName);
                    }

                    return url;
                }
            });
        } else {
            URL url = null;
            ClassLoader clazzLoader = clazz.getClassLoader();
            url = clazzLoader.getResource(resourceName);

            if (url == null) {
                clazzLoader = Thread.currentThread().getContextClassLoader();
                url = clazzLoader.getResource(resourceName);
            }

            return url;
        }
    }

    /**
     * Set the system property
     *
     * @param key
     * @param defaultValue
     *
     * @return
     */
    static void setSystemProperty(final String key, final String value) {
        SecurityManager sm = System.getSecurityManager();

        if (sm != null) {
            AccessController.doPrivileged(new PrivilegedAction