package org.apidesign.anagram.app.register;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import org.apidesign.anagram.api.Scrambler;

 import org.apidesign.anagram.api.WordLibrary;

 import org.apidesign.anagram.gui.Anagrams;

 public final class AnagramsWithProperties extends Anagrams {

     private WordLibrary wordLibrary;

     private Scrambler scrambler;

     public AnagramsWithProperties() {

     }

     private static <T> Class<? extends T> loadImpl(Class<T> clazz) throws ClassNotFoundException {

         String implName = System.getProperty(clazz.getName());

         assert implName != null;

         ClassLoader loader = Thread.currentThread().getContextClassLoader();

         if (loader == null) {

             loader = AnagramsWithProperties.class.getClassLoader();

         }

         Class<?> impl = Class.forName(implName, false, loader);

         return impl.asSubclass(clazz);

     }

     @Override

     protected WordLibrary getWordLibrary() {

         try {

             if (wordLibrary == null) {

                 wordLibrary = loadImpl(WordLibrary.class).newInstance();

             }

             return wordLibrary;

         } catch (Exception ex) {

             throw new IllegalStateException(ex);

         }

     }

     @Override

     protected Scrambler getScrambler() {

         try {

             if (scrambler == null) {

                 scrambler = loadImpl(Scrambler.class).newInstance();

             }

             return scrambler;

         } catch (Exception ex) {

             throw new IllegalStateException(ex);

         }

     }

 }