class/System.Json/System.Json/JsonArray.cs

   1
   2 using System;
   3 using System.Collections;
   4 using System.Collections.Generic;
   5 using System.Globalization;
   6 using System.IO;
   7 using System.Text;
   8
   9 namespace System.Json
  10 {
  11         public class JsonArray : JsonValue, IList<JsonValue>
  12         {
  13                 int known_count = -1;
  14                 List<JsonValue> list;
  15                 IEnumerable<JsonValue> source;
  16
  17                 public JsonArray (params JsonValue [] items)
  18                         : this ((IEnumerable<JsonValue>) items)
  19                 {
  20                 }
  21
  22                 public JsonArray (IEnumerable<JsonValue> items)
  23                 {
  24                         if (items == null)
  25                                 throw new ArgumentNullException ("items");
  26                         this.source = items;
  27                 }
  28
  29                 public override int Count {
  30                         get {
  31                                 if (known_count < 0) {
  32                                         if (list != null)
  33                                                 known_count = list.Count;
  34                                         else {
  35                                                 known_count = 0;
  36                                                 foreach (JsonValue v in source)
  37                                                         known_count++;
  38                                         }
  39                                 }
  40                                 return known_count;
  41                         }
  42                 }
  43
  44                 public bool IsReadOnly {
  45                         get { return false; }
  46                 }
  47
  48                 public override sealed JsonValue this [int index] {
  49                         get {
  50                                 if (list != null)
  51                                         return list [index];
  52                                 int i = -1;
  53                                 foreach (JsonValue v in source)
  54                                         if (++i == index)
  55                                                 return v;
  56                                 throw new ArgumentOutOfRangeException ("index");
  57                         }
  58                         set {
  59                                 PopulateList ();
  60                                 list [index] = value;
  61                         }
  62                 }
  63
  64                 public override JsonType JsonType {
  65                         get { return JsonType.Array; }
  66                 }
  67
  68                 public void Add (JsonValue item)
  69                 {
  70                         if (item == null)
  71                                 throw new ArgumentNullException ("item");
  72                         PopulateList ();
  73                         list.Add (item);
  74                 }
  75
  76                 public void AddRange (IEnumerable<JsonValue> items)
  77                 {
  78                         if (items == null)
  79                                 throw new ArgumentNullException ("items");
  80                         if (list != null)
  81                                 list.AddRange (items);
  82                         else
  83                                 source = new MergedEnumerable<JsonValue> (source, items);
  84                 }
  85
  86                 public void AddRange (JsonValue [] items)
  87                 {
  88                         AddRange ((IEnumerable<JsonValue>) items);
  89                 }
  90
  91                 static readonly JsonValue [] empty = new JsonValue [0];
  92
  93                 public void Clear ()
  94                 {
  95                         if (list != null)
  96                                 list.Clear ();
  97                         else
  98                                 source = empty;
  99                 }
 100
 101                 public bool Contains (JsonValue item)
 102                 {
 103                         if (item == null)
 104                                 throw new ArgumentNullException ("item");
 105                         foreach (JsonValue v in this)
 106                                 if (item == v)
 107                                         return true;
 108                         return false;
 109                 }
 110
 111                 public void CopyTo (JsonValue [] array, int arrayIndex)
 112                 {
 113                         if (list != null)
 114                                 list.CopyTo (array, arrayIndex);
 115                         else
 116                                 foreach (JsonValue v in source)
 117                                         array [arrayIndex++] = v;
 118                 }
 119
 120                 public int IndexOf (JsonValue item)
 121                 {
 122                         if (item == null)
 123                                 throw new ArgumentNullException ("item");
 124                         int idx = 0;
 125                         foreach (JsonValue v in this) {
 126                                 if (item == v)
 127                                         return idx;
 128                                 idx++;
 129                         }
 130                         return -1;
 131                 }
 132
 133                 public void Insert (int index, JsonValue item)
 134                 {
 135                         PopulateList ();
 136                         list.Insert (index, item);
 137                 }
 138
 139                 public bool Remove (JsonValue item)
 140                 {
 141                         PopulateList ();
 142                         return list.Remove (item);
 143                 }
 144
 145                 public void RemoveAt (int index)
 146                 {
 147                         PopulateList ();
 148                         list.RemoveAt (index);
 149                 }
 150
 151                 public override void Save (Stream stream)
 152                 {
 153                         if (stream == null)
 154                                 throw new ArgumentNullException ("stream");
 155                         stream.WriteByte ((byte) '[');
 156                         for (int i = 0; i < Count; i++) {
 157                                 this [i].Save (stream);
 158                                 if (i < Count - 1) {
 159                                         stream.WriteByte ((byte) ',');
 160                                         stream.WriteByte ((byte) ' ');
 161                                 }
 162                         }
 163                         stream.WriteByte ((byte) ']');
 164                 }
 165
 166                 void PopulateList ()
 167                 {
 168                         if (list == null) {
 169                                 list = new List<JsonValue> (source);
 170                                 source = list;
 171                         }
 172                 }
 173
 174                 IEnumerator<JsonValue> IEnumerable<JsonValue>.GetEnumerator ()
 175                 {
 176                         return source.GetEnumerator ();
 177                 }
 178
 179                 IEnumerator IEnumerable.GetEnumerator ()
 180                 {
 181                         return source.GetEnumerator ();
 182                 }
 183         }
 184 }