/*
    * #%L
    * JRst :: Site util
    * %%
    * Copyright (C) 2006 - 2011 CodeLutin
    * %%
    * This program 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 3 of the 
   * License, or (at your option) any later version.
   * 
   * This program 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 General Lesser Public License for more details.
   * 
   * You should have received a copy of the GNU General Lesser Public 
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/lgpl-3.0.html>.
   * #L%
   */
  package org.nuiton.jrst;
  
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  
  /**
   * Some usefull methods to obtains none accessible fields and method from
   * some classes.
   *
   * @author tchemit <chemit@codelutin.com>
   * @since 1.0.6
   */
  public class ReflectUtil {
  
      public static Method getMethod(Class<?> klass, String methodName, Class<?>[] paramTypes) {
          try {
              Method declaredMethod = klass.getDeclaredMethod(methodName, paramTypes);
              declaredMethod.setAccessible(true);
              return declaredMethod;
          } catch (Exception e) {
              throw new IllegalStateException("Could not get method [" + methodName + "] from parent class :(... ", e);
          }
  
      }
  
      public static Field getField(Class<?> klass, String fieldName) {
          try {
              Field declaredField = klass.getDeclaredField(fieldName);
              declaredField.setAccessible(true);
              return declaredField;
          } catch (Exception e) {
              throw new IllegalStateException("Could not get field [" + fieldName + "] from parent class :(... ", e);
          }
  
      }
  
      public static <O> O invokeMethod(Method m, Object o, Object... params) {
          try {
              O result = (O) m.invoke(o, params);
              return result;
          } catch (Exception e) {
              throw new IllegalStateException("Could not invoke method [" + m.getName() + "] from parent class :(... ", e);
          }
  
      }
  }