1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.inputmethod.latin.utils; 18 19 import android.util.JsonReader; 20 import android.util.JsonWriter; 21 import android.util.Log; 22 23 import java.io.Closeable; 24 import java.io.IOException; 25 import java.io.StringReader; 26 import java.io.StringWriter; 27 import java.util.ArrayList; 28 import java.util.Collections; 29 import java.util.List; 30 31 public final class JsonUtils { 32 private static final String TAG = JsonUtils.class.getSimpleName(); 33 34 private static final String INTEGER_CLASS_NAME = Integer.class.getSimpleName(); 35 private static final String STRING_CLASS_NAME = String.class.getSimpleName(); 36 37 private static final String EMPTY_STRING = ""; 38 jsonStrToList(final String s)39 public static List<Object> jsonStrToList(final String s) { 40 final ArrayList<Object> list = new ArrayList<>(); 41 final JsonReader reader = new JsonReader(new StringReader(s)); 42 try { 43 reader.beginArray(); 44 while (reader.hasNext()) { 45 reader.beginObject(); 46 while (reader.hasNext()) { 47 final String name = reader.nextName(); 48 if (name.equals(INTEGER_CLASS_NAME)) { 49 list.add(reader.nextInt()); 50 } else if (name.equals(STRING_CLASS_NAME)) { 51 list.add(reader.nextString()); 52 } else { 53 Log.w(TAG, "Invalid name: " + name); 54 reader.skipValue(); 55 } 56 } 57 reader.endObject(); 58 } 59 reader.endArray(); 60 return list; 61 } catch (final IOException e) { 62 } finally { 63 close(reader); 64 } 65 return Collections.<Object>emptyList(); 66 } 67 listToJsonStr(final List<Object> list)68 public static String listToJsonStr(final List<Object> list) { 69 if (list == null || list.isEmpty()) { 70 return EMPTY_STRING; 71 } 72 final StringWriter sw = new StringWriter(); 73 final JsonWriter writer = new JsonWriter(sw); 74 try { 75 writer.beginArray(); 76 for (final Object o : list) { 77 writer.beginObject(); 78 if (o instanceof Integer) { 79 writer.name(INTEGER_CLASS_NAME).value((Integer)o); 80 } else if (o instanceof String) { 81 writer.name(STRING_CLASS_NAME).value((String)o); 82 } 83 writer.endObject(); 84 } 85 writer.endArray(); 86 return sw.toString(); 87 } catch (final IOException e) { 88 } finally { 89 close(writer); 90 } 91 return EMPTY_STRING; 92 } 93 close(final Closeable closeable)94 private static void close(final Closeable closeable) { 95 try { 96 if (closeable != null) { 97 closeable.close(); 98 } 99 } catch (final IOException e) { 100 // Ignore 101 } 102 } 103 } 104