package org.codeforamerica.open311.internals.caching;

 import android.content.Context;

 import android.content.SharedPreferences;

 import android.content.SharedPreferences.Editor;

 /**

  * Uses the <a href=

  * "http://developer.android.com/reference/android/content/SharedPreferences.html"

  * >SharedPreferences</a> of Android to store the data. Singleton class.

  * 

  * @author Santiago Munín <santimunin@gmail.com>

  * 

  */

 public class AndroidCache extends AbstractCache {

         /**

          * Unique instance of the class.

          */

         private static AndroidCache instance;

         private SharedPreferences preferences;

         /**

          * Returns the unique instance of the class.

          * 

          * @param context

          *            Android context. Needed the first time is called to build the

          *            {@link SharedPreferences}.

          * @return Unique instance of the class.

          */

         public static AndroidCache getInstance(Context context) {

                 if (instance == null) {

                         instance = new AndroidCache(context);

                 }

                 return instance;

         }

         /**

          * Prevents this class to be instantiate from outside itself.

          * 

          * @param context

          *            Android context. Needed the first time is called to build the

          *            {@link SharedPreferences}.

          */

         private AndroidCache(Context context) {

                 preferences = context.getSharedPreferences(FILE, 0);

         }

         @Override

         public void deleteCache() {

                 Editor editor = preferences.edit();

                 editor.clear();

                 editor.commit();

         }

         @Override

         protected void saveProperty(String key, String value) {

                 Editor editor = preferences.edit();

                 editor.putString(key, value);

                 editor.commit();

         }

         @Override

         protected String getProperty(String key) {

                 return preferences.getString(key, "");

         }

 }