Return true if class a is either equivalent to class b, or if class a is a subclass of class b, i.e. if a either "extends" or "implements" b. : SuperClass « Reflection « Java

1. Java
2. Reflection
3. SuperClass

Return true if class a is either equivalent to class b, or if class a is a subclass of class b, i.e. if a either "extends" or "implements" b.

        
/*
 * This file is part of aion-emu <aion-emu.com>.
 *
 * aion-emu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * aion-emu 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 Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with aion-emu.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * This class contains utilities that are used when we are working with classes
 * 
 * @author SoulKeeper
 */
public class Util{

  /**
   * Return true if class a is either equivalent to class b, or if class a is a subclass of class b, i.e. if a either
   * "extends" or "implements" b. Note tht either or both "Class" objects may represent interfaces.
   * 
   * @param a
   *            class
   * @param b
   *            class
   * @return true if a == b or a extends b or a implements b
   */
  @SuppressWarnings("rawtypes")
  public static boolean isSubclass(Class<?> a, Class<?> b)
  {
    // We rely on the fact that for any given java class or
    // primtitive type there is a unqiue Class object, so
    // we can use object equivalence in the comparisons.
    if (a == b)
    {
      return true;
    }
    if (a == null || b == null)
    {
      return false;
    }
    for (Class x = a; x != null; x = x.getSuperclass())
    {
      if (x == b)
      {
        return true;
      }
      if (b.isInterface())
      {
        Class[] interfaces = x.getInterfaces();
        for (Class anInterface : interfaces)
        {
          if (isSubclass(anInterface, b))
          {
            return true;
          }
        }
      }
    }
    return false;
  }


}

   
    
    
    
    
    
    
    
  

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