mcs/class/corlib/System/Int16.cs

   1 //
   2 // System.Int16.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) Ximian, Inc.  http://www.ximian.com
   8 // Copyright (C) 2004 Novell (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Globalization;
  31
  32 namespace System {
  33
  34         [Serializable]
  35         public struct Int16 : IFormattable, IConvertible,
  36 #if NET_2_0
  37                 IComparable, IComparable<Int16>
  38 #else
  39                 IComparable
  40 #endif
  41         {
  42
  43                 public const short MaxValue =  32767;
  44                 public const short MinValue = -32768;
  45
  46                 internal short m_value;
  47
  48                 public int CompareTo (object v)
  49                 {
  50                         if (v == null)
  51                                 return 1;
  52
  53                         if (!(v is System.Int16))
  54                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Int16"));
  55
  56                         short xv = (short) v;
  57                         if (m_value == xv)
  58                                 return 0;
  59                         if (m_value > xv)
  60                                 return 1;
  61                         else
  62                                 return -1;
  63                 }
  64
  65                 public override bool Equals (object o)
  66                 {
  67                         if (!(o is System.Int16))
  68                                 return false;
  69
  70                         return ((short) o) == m_value;
  71                 }
  72
  73                 public override int GetHashCode ()
  74                 {
  75                         return m_value;
  76                 }
  77
  78 #if NET_2_0
  79                 public int CompareTo (short value)
  80                 {
  81                         if (m_value == value)
  82                                 return 0;
  83                         if (m_value > value)
  84                                 return 1;
  85                         else
  86                                 return -1;
  87                 }
  88
  89                 public bool Equals (short value)
  90                 {
  91                         return value == m_value;
  92                 }
  93 #endif
  94
  95                 internal static bool Parse (string s, bool tryParse, out short result)
  96                 {
  97                         short val = 0;
  98                         int len;
  99                         int i, sign = 1;
 100                         bool digits_seen = false;
 101
 102                         result = 0;
 103
 104                         if (s == null)
 105                                 if (tryParse)
 106                                         return false;
 107                                 else
 108                                         throw new ArgumentNullException ("s");
 109
 110                         len = s.Length;
 111
 112                         char c;
 113                         for (i = 0; i < len; i++){
 114                                 c = s [i];
 115                                 if (!Char.IsWhiteSpace (c))
 116                                         break;
 117                         }
 118
 119                         if (i == len)
 120                                 if (tryParse)
 121                                         return false;
 122                                 else
 123                                         throw new FormatException ();
 124
 125                         c = s [i];
 126                         if (c == '+')
 127                                 i++;
 128                         else if (c == '-'){
 129                                 sign = -1;
 130                                 i++;
 131                         }
 132
 133                         for (; i < len; i++){
 134                                 c = s [i];
 135
 136                                 if (c >= '0' && c <= '9'){
 137                                         val = checked ((short) (val * 10 + (c - '0') * sign));
 138                                         digits_seen = true;
 139                                 } else {
 140                                         if (Char.IsWhiteSpace (c)){
 141                                                 for (i++; i < len; i++){
 142                                                         if (!Char.IsWhiteSpace (s [i]))
 143                                                                 if (tryParse)
 144                                                                         return false;
 145                                                                 else
 146                                                                         throw new FormatException ();
 147                                                 }
 148                                                 break;
 149                                         } else
 150                                                 if (tryParse)
 151                                                         return false;
 152                                                 else
 153                                                         throw new FormatException ();
 154                                 }
 155                         }
 156                         if (!digits_seen)
 157                                 if (tryParse)
 158                                         return false;
 159                                 else
 160                                         throw new FormatException ();
 161
 162                         result = val;
 163                         return true;
 164                 }
 165
 166                 public static short Parse (string s, IFormatProvider fp)
 167                 {
 168                         return Parse (s, NumberStyles.Integer, fp);
 169                 }
 170
 171                 public static short Parse (string s, NumberStyles style)
 172                 {
 173                         return Parse (s, style, null);
 174                 }
 175
 176                 public static short Parse (string s, NumberStyles style, IFormatProvider fp)
 177                 {
 178                         int tmpResult = Int32.Parse (s, style, fp);
 179                         if (tmpResult > Int16.MaxValue || tmpResult < Int16.MinValue)
 180                                 throw new OverflowException ("Value too large or too small.");
 181
 182                         return (short) tmpResult;
 183                 }
 184
 185                 public static short Parse (string s) {
 186                         short res;
 187
 188                         Parse (s, false, out res);
 189
 190                         return res;
 191                 }
 192
 193 #if NET_2_0
 194                 public static bool TryParse (string s, out short result) {
 195                         try {
 196                                 return Parse (s, true, out result);
 197                         }
 198                         catch (Exception) {
 199                                 result = 0;
 200                                 return false;
 201                         }
 202                 }
 203
 204                 public static bool TryParse (string s, NumberStyles style, IFormatProvider provider, out short result) {
 205                         try {
 206                                 int tmpResult;
 207
 208                                 result = 0;
 209                                 if (!Int32.TryParse (s, style, provider, out tmpResult))
 210                                         return false;
 211                                 if (tmpResult > Int16.MaxValue || tmpResult < Int16.MinValue)
 212                                         return false;
 213                                 result = (short)tmpResult;
 214                                 return true;
 215                         }
 216                         catch (Exception) {
 217                                 result = 0;
 218                                 return false;
 219                         }
 220                 }
 221 #endif
 222
 223                 public override string ToString ()
 224                 {
 225                         return ToString (null, null);
 226                 }
 227
 228                 public string ToString (IFormatProvider fp)
 229                 {
 230                         return ToString (null, fp);
 231                 }
 232
 233                 public string ToString (string format)
 234                 {
 235                         return ToString (format, null);
 236                 }
 237
 238                 public string ToString (string format, IFormatProvider fp)
 239                 {
 240                         NumberFormatInfo nfi = NumberFormatInfo.GetInstance( fp );
 241
 242                         // use "G" when format is null or String.Empty
 243                         if ((format == null) || (format.Length == 0))
 244                                 format = "G";
 245
 246                         return IntegerFormatter.NumberToString(format, nfi, m_value);
 247                 }
 248
 249                 // =========== IConvertible Methods =========== //
 250
 251                 public TypeCode GetTypeCode ()
 252                 {
 253                         return TypeCode.Int16;
 254                 }
 255
 256                 bool IConvertible.ToBoolean (IFormatProvider provider)
 257                 {
 258                         return System.Convert.ToBoolean (m_value);
 259                 }
 260
 261                 byte IConvertible.ToByte (IFormatProvider provider)
 262                 {
 263                         return System.Convert.ToByte (m_value);
 264                 }
 265
 266                 char IConvertible.ToChar (IFormatProvider provider)
 267                 {
 268                         return System.Convert.ToChar (m_value);
 269                 }
 270
 271                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 272                 {
 273                         return System.Convert.ToDateTime (m_value);
 274                 }
 275
 276                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 277                 {
 278                         return System.Convert.ToDecimal (m_value);
 279                 }
 280
 281                 double IConvertible.ToDouble (IFormatProvider provider)
 282                 {
 283                         return System.Convert.ToDouble (m_value);
 284                 }
 285
 286                 short IConvertible.ToInt16 (IFormatProvider provider)
 287                 {
 288                         return System.Convert.ToInt16 (m_value);
 289                 }
 290
 291                 int IConvertible.ToInt32 (IFormatProvider provider)
 292                 {
 293                         return System.Convert.ToInt32 (m_value);
 294                 }
 295
 296                 long IConvertible.ToInt64 (IFormatProvider provider)
 297                 {
 298                         return System.Convert.ToInt64 (m_value);
 299                 }
 300
 301                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 302                 {
 303                         return System.Convert.ToSByte (m_value);
 304                 }
 305
 306                 float IConvertible.ToSingle (IFormatProvider provider)
 307                 {
 308                         return System.Convert.ToSingle (m_value);
 309                 }
 310
 311                 object IConvertible.ToType (Type conversionType, IFormatProvider provider)
 312                 {
 313                         return System.Convert.ToType (m_value, conversionType, provider);
 314                 }
 315
 316                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 317                 {
 318                         return System.Convert.ToUInt16 (m_value);
 319                 }
 320
 321                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 322                 {
 323                         return System.Convert.ToUInt32 (m_value);
 324                 }
 325
 326                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 327                 {
 328                         return System.Convert.ToUInt64 (m_value);
 329                 }
 330         }
 331 }