mcs/class/Mono.Data.SybaseClient/Mono.Data.SybaseTypes/SybaseBinary.cs

   1 //
   2 // Mono.Data.SybaseTypes.SybaseBinary
   3 //
   4 // Author:
   5 //   Tim Coleman (tim@timcoleman.com)
   6 //
   7 // Based on System.Data.SqlTypes.SqlBinary
   8 //
   9 // (C) Ximian, Inc. 2002-2003
  10 // (C) Copyright Tim Coleman, 2002-2003
  11 //
  12
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using Mono.Data.SybaseClient;
  35 using System;
  36 using System.Data.SqlTypes;
  37 using System.Globalization;
  38
  39 namespace Mono.Data.SybaseTypes {
  40         public struct SybaseBinary : INullable, IComparable
  41         {
  42                 #region Fields
  43
  44                 byte[] value;
  45                 private bool notNull;
  46
  47                 public static readonly SybaseBinary Null;
  48
  49                 #endregion
  50
  51                 #region Constructors
  52
  53                 public SybaseBinary (byte[] value)
  54                 {
  55                         this.value = value;
  56                         notNull = true;
  57                 }
  58
  59                 #endregion
  60
  61                 #region Properties
  62
  63                 public bool IsNull {
  64                         get { return !notNull; }
  65                 }
  66
  67                 public byte this[int index] {
  68                         get {
  69                                 if (this.IsNull)
  70                                         throw new SybaseNullValueException ("The property contains Null.");
  71                                 else if (index >= this.Length)
  72                                         throw new SybaseNullValueException ("The index parameter indicates a position beyond the length of the byte array.");
  73                                 else
  74                                         return value [index];
  75                         }
  76                 }
  77
  78                 public int Length {
  79                         get {
  80                                 if (this.IsNull)
  81                                         throw new SybaseNullValueException ("The property contains Null.");
  82                                 else
  83                                         return value.Length;
  84                         }
  85                 }
  86
  87                 public byte[] Value
  88                 {
  89                         get {
  90                                 if (this.IsNull)
  91                                         throw new SybaseNullValueException ("The property contains Null.");
  92                                 else
  93                                         return value;
  94                         }
  95                 }
  96
  97                 #endregion
  98
  99                 #region Methods
 100
 101                 public int CompareTo (object value)
 102                 {
 103                         if (value == null)
 104                                 return 1;
 105                         else if (!(value is SybaseBinary))
 106                                 throw new ArgumentException ("Value is not a Mono.Data.SybaseTypes.SybaseBinary.");
 107                         else if (((SybaseBinary) value).IsNull)
 108                                 return 1;
 109                         else
 110                                 return Compare (this, (SybaseBinary) value);
 111                 }
 112
 113                 public static SybaseBinary Concat (SybaseBinary x, SybaseBinary y)
 114                 {
 115                         return (x + y);
 116                 }
 117
 118                 public override bool Equals (object value)
 119                 {
 120                         if (!(value is SybaseBinary))
 121                                 return false;
 122                         else
 123                                 return (bool) (this == (SybaseBinary)value);
 124                 }
 125
 126                 public static SybaseBoolean Equals (SybaseBinary x, SybaseBinary y)
 127                 {
 128                         return (x == y);
 129                 }
 130
 131                 public override int GetHashCode ()
 132                 {
 133                         int result = 10;
 134                         for (int i = 0; i < value.Length; i += 1)
 135                                 result = 91 * result + ((int) value [i]);
 136                         return result;
 137                 }
 138
 139                 #endregion
 140
 141                 #region Operators
 142
 143                 public static SybaseBoolean GreaterThan (SybaseBinary x, SybaseBinary y)
 144                 {
 145                         return (x > y);
 146                 }
 147
 148                 public static SybaseBoolean GreaterThanOrEqual (SybaseBinary x, SybaseBinary y)
 149                 {
 150                         return (x >= y);
 151                 }
 152
 153                 public static SybaseBoolean LessThan (SybaseBinary x, SybaseBinary y)
 154                 {
 155                         return (x < y);
 156                 }
 157
 158                 public static SybaseBoolean LessThanOrEqual (SybaseBinary x, SybaseBinary y)
 159                 {
 160                         return (x <= y);
 161                 }
 162
 163                 public static SybaseBoolean NotEquals (SybaseBinary x, SybaseBinary y)
 164                 {
 165                         return (x != y);
 166                 }
 167
 168                 public SybaseGuid ToSybaseGuid ()
 169                 {
 170                         return new SybaseGuid (value);
 171                 }
 172
 173                 public override string ToString ()
 174                 {
 175                         if (IsNull)
 176                                 return "null";
 177                         return String.Format ("SybaseBinary ({0})", Length);
 178                 }
 179
 180                 #endregion
 181
 182                 #region Operators
 183
 184                 public static SybaseBinary operator + (SybaseBinary x, SybaseBinary y)
 185                 {
 186                         byte[] b = new byte [x.Length + y.Length];
 187                         int j = 0;
 188                         int i;
 189
 190                         for (i = 0; i < x.Length; i += 1)
 191                                 b [i] = x [i];
 192
 193                         for (; i < x.Length + y.Length; i += 1) {
 194                                 b [i] = y [j];
 195                                 j += 1;
 196                         }
 197
 198                         return new SybaseBinary (b);
 199                 }
 200
 201                 public static SybaseBoolean operator == (SybaseBinary x, SybaseBinary y)
 202                 {
 203                         if (x.IsNull || y.IsNull)
 204                                 return SybaseBoolean.Null;
 205                         else
 206                                 return new SybaseBoolean (Compare (x, y) == 0);
 207                 }
 208
 209                 public static SybaseBoolean operator > (SybaseBinary x, SybaseBinary y)
 210                 {
 211                         if (x.IsNull || y.IsNull)
 212                                 return SybaseBoolean.Null;
 213                         else
 214                                 return new SybaseBoolean (Compare (x, y) > 0);
 215                 }
 216
 217                 public static SybaseBoolean operator >= (SybaseBinary x, SybaseBinary y)
 218                 {
 219                         if (x.IsNull || y.IsNull)
 220                                 return SybaseBoolean.Null;
 221                         else
 222                                 return new SybaseBoolean (Compare (x, y) >= 0);
 223                 }
 224
 225                 public static SybaseBoolean operator != (SybaseBinary x, SybaseBinary y)
 226                 {
 227                         if (x.IsNull || y.IsNull)
 228                                 return SybaseBoolean.Null;
 229                         else
 230                                 return new SybaseBoolean (Compare (x, y) != 0);
 231                 }
 232
 233                 public static SybaseBoolean operator < (SybaseBinary x, SybaseBinary y)
 234                 {
 235                         if (x.IsNull || y.IsNull)
 236                                 return SybaseBoolean.Null;
 237                         else
 238                                 return new SybaseBoolean (Compare (x, y) < 0);
 239                 }
 240
 241                 public static SybaseBoolean operator <= (SybaseBinary x, SybaseBinary y)
 242                 {
 243                         if (x.IsNull || y.IsNull)
 244                                 return SybaseBoolean.Null;
 245                         else
 246                                 return new SybaseBoolean (Compare (x, y) <= 0);
 247                 }
 248
 249                 public static explicit operator byte[] (SybaseBinary x)
 250                 {
 251                         return x.Value;
 252                 }
 253
 254                 public static explicit operator SybaseBinary (SybaseGuid x)
 255                 {
 256                         return new SybaseBinary (x.ToByteArray ());
 257                 }
 258
 259                 public static implicit operator SybaseBinary (byte[] x)
 260                 {
 261                         return new SybaseBinary (x);
 262                 }
 263
 264                 private static int Compare (SybaseBinary x, SybaseBinary y)
 265                 {
 266                         int lengthDiff = 0;
 267
 268                         if (x.Length != y.Length) {
 269                                 lengthDiff = x.Length - y.Length;
 270
 271                                 // if diff more than 0, x is longer
 272                                 if (lengthDiff > 0) {
 273                                         for (int i = x.Length - 1; i > x.Length - lengthDiff; i -= 1)
 274                                                 if (x [i] != (byte) 0)
 275                                                         return 1;
 276                                 } else {
 277                                         for (int i = y.Length - 1; i > y.Length - lengthDiff; i -= 1)
 278                                                 if (y [i] != (byte) 0)
 279                                                         return -1;
 280                                 }
 281                         }
 282
 283                         // choose shorter
 284                         int len = (lengthDiff > 0) ? y.Length : x.Length;
 285
 286                         for (int i = len - 1; i > 0; i -= 1) {
 287                                 byte bx = x [i];
 288                                 byte by = y [i];
 289
 290                                 if (bx > by)
 291                                         return 1;
 292                                 else if (bx < by)
 293                                         return -1;
 294                         }
 295
 296                         return 0;
 297                 }
 298
 299                 #endregion
 300         }
 301 }