/*license*\
   XBN-Java Library

   Copyright (c) 2014, Jeff Epstein (aliteralmind __DASH__ github __AT__ yahoo __DOT__ com)

   This software is dual-licensed under the:
   - Lesser General Public License (LGPL) version 3.0 or, at your option, any later version;
   - Apache Software License (ASL) version 2.0.

   Either license may be applied at your discretion. More information may be found at
   - http://en.wikipedia.org/wiki/Multi-licensing.

   The text of both licenses is available in the root directory of this project, under the names "LICENSE_lgpl-3.0.txt" and "LICENSE_asl-2.0.txt". The latest copies may be downloaded at:
   - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
   - ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
\*license*/

package  com.github.xbn.examples.util.non_xbn;
/**
   <p>Demonstrates two ways of determining if one class extends another: Using <code>{@link java.lang.Class Class}.{@link java.lang.Class#isAssignableFrom(Class) isAssignableFrom}</code> (recommended), and manually iterating through the super-classes until the fully-qualified names match (not recommended).</p>

   <p>{@code java com.github.xbn.examples.util.non_xbn.TwoWaysToShowXExtendsY}</p>

 * @since  0.1.0
 * @author  Copyright (C) 2014, Jeff Epstein ({@code aliteralmind __DASH__ github __AT__ yahoo __DOT__ com}), dual-licensed under the LGPL (version 3.0 or later) or the ASL (version 2.0). See source code for details. <a href="http://xbnjava.aliteralmind.com">{@code http://xbnjava.aliteralmind.com}</a>, <a href="https://github.com/aliteralmind/xbnjava">{@code https://github.com/aliteralmind/xbnjava}</a>

 **/
public class TwoWaysToShowXExtendsY  {
   public static final void main(String[] ignored)  {
      System.out.println("doesAClassExtendAnother(Sub.class, Base.class)=" + doesAClassExtendAnother(Sub.class, Base.class));
      System.out.println("doesAClassExtendAnother(Base.class, Sub.class)=" + doesAClassExtendAnother(Base.class, Sub.class));

      System.out.println("Base.class.isAssignableFrom(Sub.class)=" + Base.class.isAssignableFrom(Sub.class));
      System.out.println("Sub.class.isAssignableFrom(Base.class)=" + Sub.class.isAssignableFrom(Base.class));
   }
   public static final boolean doesAClassExtendAnother(Class cls_fqcnShouldExtend, Class cls_fqcnShouldBeExtended)  {

      String snSbx = null;
      try  {
         snSbx = cls_fqcnShouldBeExtended.getName();
      }  catch(NullPointerException npx)  {
         throw  new NullPointerException("cls_fqcnShouldBeExtended");
      }

      Class clsSuper = null;
      try  {
         clsSuper = cls_fqcnShouldExtend.getSuperclass();
      }  catch(NullPointerException npx)  {
         throw  new NullPointerException("cls_fqcnShouldExtend");
      }

      while(clsSuper != null)  {
         if(clsSuper.getName().equals(snSbx))  {
            return  true;
         }
         clsSuper = clsSuper.getSuperclass();
      }
      return  false;
   }
}
class Base  {
}
class Sub extends Base  {
}