mcs/class/corlib/System.IO/StringWriter.cs

   1 //\r
   2 // System.IO.StringWriter\r
   3 //\r
   4 // Author: Marcin Szczepanski (marcins@zipworld.com.au)\r
   5 //\r
   6 \r
   7 using System.Text;\r
   8 \r
   9 namespace System.IO {\r
  10                 [Serializable]\r
  11         public class StringWriter : TextWriter {\r
  12                 \r
  13                 private StringBuilder internalString;\r
  14 \r
  15                 public StringWriter() {\r
  16                         internalString = new StringBuilder();\r
  17                 }\r
  18 \r
  19                 public StringWriter( IFormatProvider formatProvider ) {\r
  20                         internalFormatProvider = formatProvider;\r
  21                 }\r
  22 \r
  23                 public StringWriter( StringBuilder sb ) : this (sb, null) {\r
  24 \r
  25                 }\r
  26 \r
  27                 public StringWriter( StringBuilder sb, IFormatProvider formatProvider ) {\r
  28                         \r
  29                         if (sb == null)\r
  30                                 throw new ArgumentNullException ();\r
  31 \r
  32                         internalString = sb;\r
  33                         internalFormatProvider = formatProvider;\r
  34                 }\r
  35 \r
  36                 public override System.Text.Encoding Encoding {\r
  37                         get {\r
  38                                 return System.Text.Encoding.Unicode;\r
  39                         }\r
  40                 }\r
  41 \r
  42                 public override void Close() {\r
  43                         Dispose( true );\r
  44                 }\r
  45 \r
  46                 protected override void Dispose (bool disposing)\r
  47                 {\r
  48                         // MS.NET doesn't clear internal buffer.\r
  49                         // internalString = null;\r
  50                         base.Dispose (disposing);\r
  51                 }\r
  52 \r
  53                 public virtual StringBuilder GetStringBuilder() {\r
  54                         return internalString;\r
  55                 }\r
  56 \r
  57                 public override string ToString() {\r
  58                         return internalString.ToString();\r
  59                 }\r
  60 \r
  61                 public override void Write( char value ) {\r
  62                         internalString.Append( value );\r
  63                 }\r
  64 \r
  65                 public override void Write( string value ) {\r
  66                         internalString.Append( value );\r
  67                 }\r
  68 \r
  69                 public override void Write( char[] buffer, int index, int count ) {\r
  70                         if( buffer == null ) {\r
  71                                 throw new ArgumentNullException();\r
  72                         } else if( index < 0 || count < 0 ) {\r
  73                                 throw new ArgumentOutOfRangeException();\r
  74                         } else if( index > buffer.Length || index + count > buffer.Length ) {\r
  75                                 throw new ArgumentException();\r
  76                         }\r
  77                         \r
  78                         char[] writeBuffer = new char[ count ];\r
  79 \r
  80                         Array.Copy( buffer, index, writeBuffer, 0, count );\r
  81 \r
  82                         internalString.Append( writeBuffer );\r
  83                 }\r
  84                           \r
  85         }\r
  86 }\r
  87                         \r
  88                         \r