/*
    * Copyright 2011 FatWire Corporation. All Rights Reserved.
    *
    * 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 com.fatwire.gst.foundation.controller.support;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  /**
   * 
   * @author Dolf Dijkstra
   * 
   */
  public class TemplateMethodFactory {
      private static final Class<?>[] NO_PARAMS = new Class[0];
      private static final Object[] NO_ARGS = new Object[0];
  
      @SuppressWarnings("unchecked")
      static <T> T createByMethod(Object template, Class<T> c) throws SecurityException, NoSuchMethodException,
              IllegalArgumentException, IllegalAccessException, InvocationTargetException {
          Method m;
          m = template.getClass().getMethod("create" + c.getSimpleName(), NO_PARAMS);
          if (m != null) {
              Object o = m.invoke(template, NO_ARGS);
              if (o != null && c.isAssignableFrom(o.getClass())) {
                  return (T) o;
  
              }
          }
          return null;
      }
  
      static <T> T createByConstructor(Class<T> c) throws SecurityException, NoSuchMethodException, IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException   {
          if(c.isInterface()) return null; //TODO medium test for abstract class
          final Constructor<T> constr = c.getConstructor(NO_PARAMS);
          return constr.newInstance();
      }
  
  }