class/System.Json/System.Json/JsonObject.cs

   1 using System;
   2 using System.Collections;
   3 using System.Collections.Generic;
   4 using System.Globalization;
   5 using System.IO;
   6 using System.Text;
   7
   8 using JsonPair = System.Collections.Generic.KeyValuePair<string, System.Json.JsonValue>;
   9 using JsonPairEnumerable = System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string, System.Json.JsonValue>>;
  10
  11
  12 namespace System.Json
  13 {
  14         public class JsonObject : JsonValue, IDictionary<string, JsonValue>, ICollection<KeyValuePair<string, JsonValue>>
  15         {
  16                 int known_count = -1;
  17                 Dictionary<string, JsonValue> map;
  18                 JsonPairEnumerable source;
  19
  20                 public JsonObject (params KeyValuePair<string, JsonValue> [] items)
  21                         : this ((JsonPairEnumerable) items)
  22                 {
  23                 }
  24
  25                 public JsonObject (JsonPairEnumerable items)
  26                 {
  27                         if (items == null)
  28                                 throw new ArgumentNullException ("items");
  29                         this.source = items;
  30                 }
  31
  32                 public override int Count {
  33                         get {
  34                                 if (known_count < 0) {
  35                                         if (map != null)
  36                                                 known_count = map.Count;
  37                                         else {
  38                                                 known_count = 0;
  39                                                 foreach (JsonPair p in source)
  40                                                         known_count++;
  41                                         }
  42                                 }
  43                                 return known_count;
  44                         }
  45                 }
  46
  47                 public IEnumerator<JsonPair> GetEnumerator ()
  48                 {
  49                         return AsEnumerable ().GetEnumerator ();
  50                 }
  51
  52                 IEnumerator IEnumerable.GetEnumerator ()
  53                 {
  54                         return AsEnumerable ().GetEnumerator ();
  55                 }
  56
  57                 JsonPairEnumerable AsEnumerable ()
  58                 {
  59                         return map ?? source;
  60                 }
  61
  62                 public bool IsReadOnly {
  63                         get { return false; }
  64                 }
  65
  66                 bool ICollection<JsonPair>.IsReadOnly {
  67                         get { return ((ICollection<JsonPair>) map).IsReadOnly; }
  68                 }
  69
  70                 public override sealed JsonValue this [string key] {
  71                         get {
  72                                 foreach (JsonPair pair in AsEnumerable ())
  73                                         if (pair.Key == key)
  74                                                 return pair.Value;
  75                                 throw new KeyNotFoundException (String.Format ("key '{0}' was not found.", key));
  76                         }
  77                         set {
  78                                 PopulateMap ();
  79                                 map [key] = value;
  80                         }
  81                 }
  82
  83                 public override JsonType JsonType {
  84                         get { return JsonType.Object; }
  85                 }
  86
  87                 public ICollection<string> Keys {
  88                         get {
  89                                 PopulateMap ();
  90                                 return map.Keys;
  91                         }
  92                 }
  93
  94                 public ICollection<JsonValue> Values {
  95                         get {
  96                                 PopulateMap ();
  97                                 return map.Values;
  98                         }
  99                 }
 100
 101                 public void Add (string key, JsonValue value)
 102                 {
 103                         if (key == null)
 104                                 throw new ArgumentNullException ("key");
 105                         if (value == null)
 106                                 throw new ArgumentNullException ("value");
 107                         PopulateMap ();
 108                         map [key] = value;
 109                 }
 110
 111                 public void Add (JsonPair pair)
 112                 {
 113                         Add (pair.Key, pair.Value);
 114                 }
 115
 116                 public void AddRange (JsonPairEnumerable items)
 117                 {
 118                         if (items == null)
 119                                 throw new ArgumentNullException ("items");
 120                         source = new MergedEnumerable<JsonPair> (source, items);
 121                         map = null;
 122                 }
 123
 124                 public void AddRange (JsonPair [] items)
 125                 {
 126                         AddRange ((JsonPairEnumerable) items);
 127                 }
 128
 129                 static readonly JsonPair [] empty = new JsonPair [0];
 130
 131                 public void Clear ()
 132                 {
 133                         if (map != null)
 134                                 map.Clear ();
 135                         else
 136                                 source = empty;
 137                 }
 138
 139                 bool ICollection<JsonPair>.Contains (JsonPair item)
 140                 {
 141                         return ContainsKey (item.Key);
 142                 }
 143
 144                 public override bool ContainsKey (string key)
 145                 {
 146                         if (key == null)
 147                                 throw new ArgumentNullException ("key");
 148                         foreach (JsonPair p in AsEnumerable ())
 149                                 if (p.Key == key)
 150                                         return true;
 151                         return false;
 152                 }
 153
 154                 public void CopyTo (JsonPair [] array, int arrayIndex)
 155                 {
 156                         foreach (JsonPair p in AsEnumerable ())
 157                                 array [arrayIndex++] = p;
 158                 }
 159
 160                 public bool Remove (string key)
 161                 {
 162                         PopulateMap ();
 163                         return map.Remove (key);
 164                 }
 165
 166                 bool ICollection<JsonPair>.Remove (JsonPair item)
 167                 {
 168                         return ((ICollection<JsonPair>) map).Remove (item);
 169                 }
 170
 171                 public override void Save (Stream stream)
 172                 {
 173                         if (stream == null)
 174                                 throw new ArgumentNullException ("stream");
 175                         stream.WriteByte ((byte) '{');
 176                         foreach (JsonPair pair in this) {
 177                                 stream.WriteByte ((byte) '"');
 178                                 byte [] bytes = Encoding.UTF8.GetBytes (EscapeString (pair.Key));
 179                                 stream.Write (bytes, 0, bytes.Length);
 180                                 stream.WriteByte ((byte) '"');
 181                                 stream.WriteByte ((byte) ',');
 182                                 stream.WriteByte ((byte) ' ');
 183                                 pair.Value.Save (stream);
 184                         }
 185                         stream.WriteByte ((byte) '}');
 186                 }
 187
 188                 public bool TryGetValue (string key, out JsonValue value)
 189                 {
 190                         foreach (JsonPair p in AsEnumerable ())
 191                                 if (p.Key == key) {
 192                                         value = p.Value;
 193                                         return true;
 194                                 }
 195                         value = null;
 196                         return false;
 197                 }
 198
 199                 void PopulateMap ()
 200                 {
 201                         if (map == null) {
 202                                 map = new Dictionary<string, JsonValue> ();
 203                                 foreach (JsonPair pair in source)
 204                                         map.Add (pair.Key, pair.Value);
 205                         }
 206                 }
 207         }
 208 }