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);

        }

    }

}