/*
Copyright 2014 Prateek Srivastava

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.

This file may have been modified after being copied from it's original source.
 */
package com.f2prateek.rx.preferences;

import android.content.SharedPreferences;
import android.support.annotation.NonNull;

final class EnumAdapter<T extends Enum<T>> implements Preference.Adapter<T> {
  private final Class<T> enumClass;

  EnumAdapter(Class<T> enumClass) {
    this.enumClass = enumClass;
  }

  @Override public T get(@NonNull String key, @NonNull SharedPreferences preferences) {
    String value = preferences.getString(key, null);
    assert value != null; // Not called unless key is present.
    return Enum.valueOf(enumClass, value);
  }

  @Override
  public void set(@NonNull String key, @NonNull T value, @NonNull SharedPreferences.Editor editor) {
    editor.putString(key, value.name());
  }
}