/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited

  *

  * 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.acegisecurity.util;

 import org.springframework.util.Assert;

 import org.springframework.util.ReflectionUtils;

 import java.lang.reflect.Field;

 /**

  * Offers static methods for directly manipulating static fields.

  *

  * @author Ben Alex

  * @version $Id: FieldUtils.java 1784 2007-02-24 21:00:24Z luke_t $

  */

 public final class FieldUtils {

     //~ Constructors ===================================================================================================

     private FieldUtils() {

     }

     //~ Methods ========================================================================================================

     public static String getAccessorName(String fieldName, Class type) {

         Assert.hasText(fieldName, "FieldName required");

         Assert.notNull(type, "Type required");

         if (type.getName().equals("boolean")) {

             return "is" + org.springframework.util.StringUtils.capitalize(fieldName);

         } else {

             return "get" + org.springframework.util.StringUtils.capitalize(fieldName);

         }

     }

     /**

      * Attempts to locate the specified field on the class.

      *

      * @param clazz the class definition containing the field

      * @param fieldName the name of the field to locate

      *

      * @return the Field (never null)

      *

      * @throws IllegalStateException if field could not be found

      */

     public static Field getField(Class clazz, String fieldName)

         throws IllegalStateException {

         Assert.notNull(clazz, "Class required");

         Assert.hasText(fieldName, "Field name required");

         try {

             return clazz.getDeclaredField(fieldName);

         } catch (NoSuchFieldException nsf) {

             // Try superclass

             if (clazz.getSuperclass() != null) {

                 return getField(clazz.getSuperclass(), fieldName);

             }

             throw new IllegalStateException("Could not locate field '" + fieldName + "' on class " + clazz);

         }

     }

     public static String getMutatorName(String fieldName) {

         Assert.hasText(fieldName, "FieldName required");

         return "set" + org.springframework.util.StringUtils.capitalize(fieldName);

     }

     public static Object getProtectedFieldValue(String protectedField, Object object) {

         Field field = FieldUtils.getField(object.getClass(), protectedField);

         try {

             field.setAccessible(true);

             return field.get(object);

         } catch (Exception ex) {

             ReflectionUtils.handleReflectionException(ex);

             return null; // unreachable - previous line throws exception

         }

     }

     public static void setProtectedFieldValue(String protectedField, Object object, Object newValue) {

         Field field = FieldUtils.getField(object.getClass(), protectedField);

         try {

             field.setAccessible(true);

             field.set(object, newValue);

         } catch (Exception ex) {

             ReflectionUtils.handleReflectionException(ex);

         }

     }

 }