/**
 * Copyright (C) 2009 eXo Platform SAS.
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.services.xml.serialize;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
 *  Author : Nhu Dinh Thuan
 *          Email:nhudinhthuan@yahoo.com
 * Apr 9, 2007
 */
public class ReflectUtil
{

   public Method getSetterMethod(Class<?> clazz, Field field) throws Exception
   {
      NodeMap map = field.getAnnotation(NodeMap.class);
      Method method = null;
      if (map != null)
         method = getSetterMethodByMap(clazz, map);
      if (method != null)
         return method;

      String name = getSetterOrGetter('s', field.getName());
      method = getMethodByName(clazz, name);
      if (method != null)
         return method;

      if (map != null)
         name = map.value();
      method = getMethodByName(clazz, name);
      return method;
   }

   public Method getGetterMethod(Class<?> clazz, Field field) throws Exception
   {
      NodeMap map = field.getAnnotation(NodeMap.class);
      Method method = null;
      if (map != null)
         method = getGetterMethodByMap(clazz, map);
      if (method != null)
         return method;

      String name = getSetterOrGetter('g', field.getName());
      method = getMethodByName(clazz, name);
      if (method != null)
         return method;

      if (map != null)
         name = map.value();
      method = getMethodByName(clazz, name);
      return method;
   }

   private Method getSetterMethodByMap(Class<?> clazz, NodeMap map)
   {
      Method[] methods = clazz.getDeclaredMethods();
      for (Method ele : methods)
      {
         SetterMap getterMap = ele.getAnnotation(SetterMap.class);
         if (getterMap == null)
            continue;
         if (getterMap.value().equals(map.value()))
            return ele;
      }
      Method method = getGetterMethodByMap(clazz.getSuperclass(), map);
      if (method != null)
         return method;
      return null;
   }

   private Method getGetterMethodByMap(Class<?> clazz, NodeMap map)
   {
      Method[] methods = clazz.getDeclaredMethods();
      for (Method ele : methods)
      {
         GetterMap getterMap = ele.getAnnotation(GetterMap.class);
         if (getterMap == null)
            continue;
         if (getterMap.value().equals(map.value()))
            return ele;
      }
      Method method = getGetterMethodByMap(clazz.getSuperclass(), map);
      if (method != null)
         return method;
      return null;
   }

   private Method getMethodByName(Class<?> clazz, String name)
   {
      Method method = getPublicMethodByName(clazz, name);
      if (method != null)
         return method;
      method = getProtectedMethodByName(clazz, name);
      if (method != null)
         return method;
      return null;
   }

   private Method getPublicMethodByName(Class<?> clazz, String name)
   {
      Method[] methods = clazz.getMethods();
      for (Method ele : methods)
      {
         if (name.equals(ele.getName()))
            return ele;
      }
      return null;
   }

   private Method getProtectedMethodByName(Class<?> clazz, String name)
   {
      Method[] methods = clazz.getDeclaredMethods();
      for (Method ele : methods)
      {
         if (ele.isAccessible())
            continue;
         if (name.equals(ele.getName()))
            return ele;
      }
      Method method = getProtectedMethodByName(clazz.getSuperclass(), name);
      if (method != null)
         return method;
      return null;
   }

   private String getSetterOrGetter(char c, String name)
   {
      char[] chars = new char[name.length() + 3];
      chars[0] = c;
      chars[1] = 'e';
      chars[2] = 't';
      chars[3] = Character.toUpperCase(name.charAt(0));
      for (int i = 1; i < name.length(); i++)
      {
         chars[i + 3] = name.charAt(i);
      }
      return new String(chars);
   }

   public boolean isPrimitiveType(Class<?> type)
   {
      return type == Integer.class || type == Long.class || type == Boolean.class || type == Double.class
         || type == Float.class || type == Short.class || type == Byte.class || type == Short.class
         || type == Character.class || type == String.class || type == StringBuffer.class
         || type == StringBuilder.class;
   }

}
