Home | History | Annotate | Download | only in preferences 
      1 /*
      2  * Copyright (C) 2013 Google Inc.
      3  * Licensed to The Android Open Source Project.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 package com.android.mail.preferences;
     18 
     19 import com.google.common.collect.Sets;
     20 
     21 import org.json.JSONArray;
     22 import org.json.JSONException;
     23 import org.json.JSONObject;
     24 
     25 import java.util.Set;
     26 
     27 /**
     28 * A POJO for shared preferences to be used for backing up and restoring.
     29 */
     30 public class SimpleBackupSharedPreference implements BackupSharedPreference {
     31     private String mKey;
     32     private Object mValue;
     33 
     34     private static final String KEY = "key";
     35     private static final String VALUE = "value";
     36 
     37     public SimpleBackupSharedPreference(final String key, final Object value) {
     38         mKey = key;
     39         mValue = value;
     40     }
     41 
     42     @Override
     43     public String getKey() {
     44         return mKey;
     45     }
     46 
     47     @Override
     48     public Object getValue() {
     49         return mValue;
     50     }
     51 
     52     public void setValue(Object value) {
     53         mValue = value;
     54     }
     55 
     56     @Override
     57     public JSONObject toJson() throws JSONException {
     58         final JSONObject json = new JSONObject();
     59         json.put(KEY, mKey);
     60         if (mValue instanceof Set) {
     61             final Set<?> set = (Set<?>) mValue;
     62             final JSONArray array = new JSONArray();
     63             for (final Object o : set) {
     64                 array.put(o);
     65             }
     66             json.put(VALUE, array);
     67         } else {
     68             json.put(VALUE, mValue);
     69         }
     70         return json;
     71     }
     72 
     73     public static BackupSharedPreference fromJson(final JSONObject json) throws JSONException {
     74         Object value = json.get(VALUE);
     75         if (value instanceof JSONArray) {
     76             final Set<Object> set = Sets.newHashSet();
     77             final JSONArray array = (JSONArray) value;
     78             for (int i = 0, len = array.length(); i < len; i++) {
     79                   set.add(array.get(i));
     80             }
     81             value = set;
     82         }
     83         return new SimpleBackupSharedPreference(json.getString(KEY), value);
     84     }
     85 
     86     @Override
     87     public String toString() {
     88         return "BackupSharedPreference{" + "mKey='" + mKey + '\'' + ", mValue=" + mValue + '}';
     89     }
     90 }
     91