mcs/class/System.Data.OracleClient/System.Data.OracleClient/OracleString.cs

   1 //
   2 // OracleString.cs
   3 //
   4 // Part of the Mono class libraries at
   5 // mcs/class/System.Data.OracleClient/System.Data.OracleClient
   6 //
   7 // Assembly: System.Data.OracleClient.dll
   8 // Namespace: System.Data.OracleClient
   9 //
  10 // Authors: Tim Coleman <tim@timcoleman.com>
  11 //          Atsushi Enomoto <atsushi@ximian.com>
  12 //
  13 // Copyright (C) Tim Coleman, 2003
  14 //
  15 // Licensed under the MIT/X11 License.
  16 //
  17
  18 using System;
  19 using System.Data.SqlTypes;
  20 using System.Globalization;
  21
  22 namespace System.Data.OracleClient
  23 {
  24         public struct OracleString : IComparable, INullable
  25         {
  26                 #region Fields
  27
  28                 string value;
  29                 bool notNull;
  30
  31                 public static readonly OracleString Empty = new OracleString (String.Empty);
  32                 public static readonly OracleString Null = new OracleString ();
  33
  34                 #endregion // Fields
  35
  36                 #region Constructors
  37
  38                 public OracleString (string s)
  39                 {
  40                         value = s;
  41                         notNull = true;
  42                 }
  43
  44                 #endregion // Constructors
  45
  46                 #region Properties
  47
  48                 public bool IsNull {
  49                         get { return !notNull; }
  50                 }
  51
  52                 public int Length {
  53                         get { return value.Length; }
  54                 }
  55
  56                 public char this [int index] {
  57                         get { return value [index]; }
  58                 }
  59
  60                 public string Value {
  61                         get { return value; }
  62                 }
  63
  64                 #endregion // Properties
  65
  66                 #region Methods
  67
  68                 public int CompareTo (object value)
  69                 {
  70                         if (value == null)
  71                                 return 1;
  72                         else if (!(value is OracleString))
  73                                 throw new ArgumentException ("Value is not a System.Data.OracleClient.OracleString");
  74                         else if (((OracleString) value).IsNull)
  75                                 return 1;
  76                         else
  77                                 return this.value.CompareTo (((OracleString) value).Value);
  78                 }
  79
  80                 [MonoTODO]
  81                 public static OracleBoolean GreaterThan (OracleString x, OracleString y)
  82                 {
  83                         throw new NotImplementedException ();
  84                 }
  85
  86                 [MonoTODO]
  87                 public static OracleBoolean GreaterThanOrEqual (OracleString x, OracleString y)
  88                 {
  89                         throw new NotImplementedException ();
  90                 }
  91
  92                 public static OracleBoolean LessThan (OracleString x, OracleString y)
  93                 {
  94                         return (x < y);
  95                 }
  96
  97                 public static OracleBoolean LessThanOrEqual (OracleString x, OracleString y)
  98                 {
  99                         return (x <= y);
 100                 }
 101
 102                 public static OracleString Concat (OracleString x, OracleString y)
 103                 {
 104                         return x + y;
 105                 }
 106
 107                 public override int GetHashCode ()
 108                 {
 109                         // It returns value string's HashCode.
 110                         return notNull ? value.GetHashCode () : 0;
 111                 }
 112
 113                 public override bool Equals (object o)
 114                 {
 115                         if (o is OracleString) {
 116                                 OracleString s = (OracleString) o;
 117                                 if (notNull && s.notNull)
 118                                         return value == s.value;
 119                                 else
 120                                         throw new InvalidOperationException ("the value is Null.");
 121                         }
 122                         return false;
 123                 }
 124
 125                 public static OracleBoolean Equals (OracleString x, OracleString y)
 126                 {
 127                         return (x == y);
 128                 }
 129
 130                 public static OracleBoolean NotEquals (OracleString x, OracleString y)
 131                 {
 132                         return (x != y);
 133                 }
 134
 135                 public override string ToString ()
 136                 {
 137                         return notNull ? value : "Null";
 138                 }
 139
 140                 #endregion // Methods
 141
 142                 #region Operators
 143
 144                 public static OracleString operator + (OracleString x, OracleString y)
 145                 {
 146                         return (x.notNull && y.notNull) ?
 147                                 new OracleString (x.value + y.value) :
 148                                 Null;
 149                 }
 150
 151                 public static OracleBoolean operator == (OracleString x, OracleString y)
 152                 {
 153                         return (!x.notNull || !y.notNull) ?
 154                                 OracleBoolean.Null : new OracleBoolean (x.value == y.value);
 155                 }
 156
 157                 public static explicit operator string (OracleString x)
 158                 {
 159                         return x.Value;
 160                 }
 161
 162                 [MonoTODO]
 163                 public static OracleBoolean operator > (OracleString x, OracleString y)
 164                 {
 165                         throw new NotImplementedException ();
 166                 }
 167
 168                 [MonoTODO]
 169                 public static OracleBoolean operator >= (OracleString x, OracleString y)
 170                 {
 171                         throw new NotImplementedException ();
 172                 }
 173
 174                 public static implicit operator OracleString (string s)
 175                 {
 176                         return new OracleString (s);
 177                 }
 178
 179                 public static OracleBoolean operator != (OracleString x, OracleString y)
 180                 {
 181                         return (!x.notNull || !y.notNull) ?
 182                                 OracleBoolean.Null : x.value != y.value;
 183                 }
 184
 185                 public static OracleBoolean operator < (OracleString x, OracleString y)
 186                 {
 187                         return (!x.notNull || !y.notNull) ?
 188                                 OracleBoolean.Null :
 189                                 new OracleBoolean (String.Compare (x.value, y.value, false, CultureInfo.InvariantCulture) < 0);
 190                 }
 191
 192                 public static OracleBoolean operator <= (OracleString x, OracleString y)
 193                 {
 194                         return (!x.notNull || !y.notNull) ?
 195                                 OracleBoolean.Null : new OracleBoolean (String.Compare (x.value, y.value, false, CultureInfo.InvariantCulture) <= 0);
 196                 }
 197
 198                 #endregion // Operators
 199         }
 200 }