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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * 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 br.com.anteros.bean.validation.util;

import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

import br.com.anteros.core.utils.ClassUtils;

/**
 * Description: utility methods to perform actions with AccessController or without. 

 */
public class PrivilegedActions {
    private static String lineSeparator = null;
    private static String pathSeparator = null;

    /**
     * Return the value of the "line.separator" system property.
     * 
     * Requires security policy: 
     *   'permission java.util.PropertyPermission "read";'
     */
    @Deprecated // unused method - will remove in future release
    public static final String getLineSeparator() {
        if (lineSeparator == null) {
            lineSeparator =
                AccessController.doPrivileged(new PrivilegedAction() {
                    public String run() {
                        return System.getProperty("line.separator");
                    }
                });
        }
        return lineSeparator;
    }

    /**
     * Return the value of the "path.separator" system property.
     * 
     * Requires security policy:
     *   'permission java.util.PropertyPermission "read";'
     */
    @Deprecated // unused method - will remove in future release
    public static final String getPathSeparator() {
        if (pathSeparator == null) {
            pathSeparator =
                AccessController.doPrivileged(new PrivilegedAction() {
                    public String run() {
                        return System.getProperty("path.separator");
                    }
                });
        }
        return pathSeparator;
    }

    /**
     * Perform action with AccessController.doPrivileged() if security if enabled.
     *
     * @param action - the action to run
     * @return result of running the action
     */
    // should not be called by just anyone; do not increase access
    private static  T run(PrivilegedAction action) {
        if (System.getSecurityManager() != null) {
            return AccessController.doPrivileged(action);
        } else {
            return action.run();
        }
    }

    /**
     * Perform action with AccessController.doPrivileged() if security if enabled.
     *
     * @param action - the action to run
     * @return result of running the action
     */
    // should not be called by just anyone; do not increase access
    private static  T run(final PrivilegedExceptionAction action) throws PrivilegedActionException, Exception {
        if (System.getSecurityManager() != null) {
            return AccessController.doPrivileged(action);
        } else {
            return action.run();
        }
    }

    /**
     * Perform AccessController.doPrivileged() action for ClassUtil.getClass()
     * 
     * @return Class
     * @exception Exception
     */
    public static Class getClass(final ClassLoader classLoader, final String className) throws Exception {
        return run(new PrivilegedExceptionAction>() {
            public Class run() throws Exception {
                return ClassUtils.getClass(classLoader, className, true);
            }
        });
    }

    /**
     * Return a PrivilegedAction object for clazz.getDeclaredMethod().invoke().
     * 
     * Requires security policy
     *  'permission java.lang.RuntimePermission "accessDeclaredMembers";'
     *  'permission java.lang.reflect.ReflectPermission "suppressAccessChecks";'
     *   
     * @return Object
     * @exception IllegalAccessException, InvocationTargetException
     */
    public static Object getAnnotationValue(final Annotation annotation, final String name)
          throws IllegalAccessException, InvocationTargetException {
        return run(new PrivilegedAction