content: /**
   * Copyright (C) 2010-2016 eBusiness Information, Excilys Group
   *
   * 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.
   */
  package org.androidannotations.api.sharedpreferences;
  
  import android.content.SharedPreferences;
  import android.content.SharedPreferences.Editor;
  
  public abstract class AbstractPrefField<T> {
  
  	protected final T defaultValue;
  
  	protected final SharedPreferences sharedPreferences;
  	protected final String key;
  
  	public AbstractPrefField(SharedPreferences sharedPreferences, String key, T defaultValue) {
  		this.sharedPreferences = sharedPreferences;
  		this.key = key;
  		this.defaultValue = defaultValue;
  	}
  
  	public final boolean exists() {
  		return sharedPreferences.contains(key);
  	}
  
  	public String key() {
  		return this.key;
  	}
  
  	public final T get() {
  		return getOr(defaultValue);
  	}
  
  	public abstract T getOr(T defaultValue);
  
  	public final void put(T value) {
  		putInternal((value == null) ? defaultValue : value);
  	};
  
  	protected abstract void putInternal(T value);
  
  	public final void remove() {
  		apply(edit().remove(key));
  	}
  
  	protected Editor edit() {
  		return sharedPreferences.edit();
  	}
  
  	protected final void apply(Editor editor) {
  		SharedPreferencesCompat.apply(editor);
  	}
  
  }
  