EnumPreference

EnumPreference.java

package com.example.utils.prefs;

import android.content.SharedPreferences;

public final class EnumPreference<T extends Enum<T>> {

  private final SharedPreferences preferences;
  private final String key;
  private final Class<T> type;
  private final T defaultValue;

  public EnumPreference(SharedPreferences preferences, String key, Class<T> type) {
    this(preferences, key, type, null);
  }

  public EnumPreference(SharedPreferences preferences, String key, Class<T> type, T defaultValue) {
    this.preferences = preferences;
    this.key = key;
    this.type = type;
    this.defaultValue = defaultValue;
  }

  public boolean isSet() {
    return preferences.contains(key);
  }

  public void set(Enum value) {
    preferences.edit().putString(key, value.name()).apply();
  }

  public T get() {
    String name = preferences.getString(key, null);
    if (name != null) {
      try {
        return Enum.valueOf(type, name);
      } catch (IllegalArgumentException ignored) {
      }
    }

    return defaultValue;
  }

  public void delete() {
    preferences.edit().remove(key).apply();
  }
}