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                 private bool disposed = false;\r
  15 \r
  16                 public StringWriter() : this (new StringBuilder ()) {
  17                         \r
  18                 }\r
  19 \r
  20                 public StringWriter( IFormatProvider formatProvider ) : this (new StringBuilder (), formatProvider)  {
  21 \r
  22                 }\r
  23 \r
  24                 public StringWriter( StringBuilder sb ) : this (sb, null) {\r
  25 \r
  26                 }\r
  27 \r
  28                 public StringWriter( StringBuilder sb, IFormatProvider formatProvider ) {\r
  29                         \r
  30                         if (sb == null)\r
  31                                 throw new ArgumentNullException ();\r
  32 \r
  33                         internalString = sb;\r
  34                         internalFormatProvider = formatProvider;\r
  35                 }\r
  36 \r
  37                 public override System.Text.Encoding Encoding {\r
  38                         get {\r
  39                                 return System.Text.Encoding.Unicode;\r
  40                         }\r
  41                 }\r
  42 \r
  43                 public override void Close() {\r
  44                         Dispose( true );\r
  45                         disposed = true;\r
  46                 }\r
  47 \r
  48                 protected override void Dispose (bool disposing)\r
  49                 {\r
  50                         // MS.NET doesn't clear internal buffer.\r
  51                         // internalString = null;\r
  52                         base.Dispose (disposing);\r
  53                         disposed = true;\r
  54                 }\r
  55 \r
  56                 public virtual StringBuilder GetStringBuilder() {\r
  57                         return internalString;\r
  58                 }\r
  59 \r
  60                 public override string ToString() {\r
  61                         return internalString.ToString();\r
  62                 }\r
  63 \r
  64                 public override void Write( char value ) {\r
  65 \r
  66                         if (disposed) \r
  67                                 throw new ObjectDisposedException ("StringWriter", "Cannot write to a closed StringWriter");\r
  68 \r
  69                         internalString.Append( value );\r
  70                 }\r
  71 \r
  72                 public override void Write( string value ) {\r
  73 \r
  74                         if (disposed) \r
  75                                 throw new ObjectDisposedException ("StringWriter", "Cannot write to a closed StringWriter");\r
  76 \r
  77                         internalString.Append( value );\r
  78                 }\r
  79 \r
  80                 public override void Write( char[] buffer, int index, int count ) {\r
  81 \r
  82                         if (disposed) \r
  83                                 throw new ObjectDisposedException ("StringReader", "Cannot write to a closed StringWriter");\r
  84 \r
  85                         if( buffer == null ) {\r
  86                                 throw new ArgumentNullException();\r
  87                         } else if( index < 0 || count < 0 ) {\r
  88                                 throw new ArgumentOutOfRangeException();\r
  89                         } else if( index > buffer.Length || index + count > buffer.Length ) {\r
  90                                 throw new ArgumentException();\r
  91                         }\r
  92                         \r
  93                         char[] writeBuffer = new char[ count ];\r
  94 \r
  95                         Array.Copy( buffer, index, writeBuffer, 0, count );\r
  96 \r
  97                         internalString.Append( writeBuffer );\r
  98                 }\r
  99                           \r
 100         }\r
 101 }\r
 102                         \r
 103                         \r