Source for java.nio.channels.Channels

   1: /* Channels.java --
   2:    Copyright (C) 2002, 2003, 2004, 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package java.nio.channels;
  40: 
  41: import gnu.java.nio.ChannelReader;
  42: import gnu.java.nio.ChannelWriter;
  43: import gnu.java.nio.InputStreamChannel;
  44: import gnu.java.nio.OutputStreamChannel;
  45: 
  46: import java.io.InputStream;
  47: import java.io.OutputStream;
  48: import java.io.Reader;
  49: import java.io.Writer;
  50: import java.nio.charset.Charset;
  51: import java.nio.charset.CharsetDecoder;
  52: import java.nio.charset.CharsetEncoder;
  53: import java.nio.charset.UnsupportedCharsetException;
  54: 
  55: 
  56: /**
  57:  * @since 1.4
  58:  */
  59: public final class Channels
  60: {
  61:   /**
  62:    * This class isn't intended to be instantiated.
  63:    */
  64:   private Channels()
  65:   {
  66:     // Do nothing here.
  67:   }
  68: 
  69:   /**
  70:    * Constructs a stream that reads bytes from the given channel.
  71:    */
  72:   public static InputStream newInputStream(ReadableByteChannel ch)
  73:   {
  74:     return VMChannels.newInputStream(ch);
  75:   }
  76: 
  77:   /**
  78:    * Constructs a stream that writes bytes to the given channel.
  79:    */
  80:   public static OutputStream newOutputStream(WritableByteChannel ch)
  81:   {
  82:     return VMChannels.newOutputStream(ch);
  83:   }
  84: 
  85:   /**
  86:    * Constructs a channel that reads bytes from the given stream.
  87:    */
  88:   public static ReadableByteChannel newChannel(InputStream in)
  89:   {
  90:     return new InputStreamChannel(in);
  91:   }
  92: 
  93:   /**
  94:    * Constructs a channel that writes bytes to the given stream.
  95:    */
  96:   public static WritableByteChannel newChannel(OutputStream out)
  97:   {
  98:     return new OutputStreamChannel(out);
  99:   }
 100: 
 101:   /**
 102:    * Constructs a reader that decodes bytes from the given channel using the
 103:    * given decoder.
 104:    */
 105:   public static Reader newReader(ReadableByteChannel ch, CharsetDecoder dec,
 106:                                  int minBufferCap)
 107:   {
 108:     return new ChannelReader(ch, dec, minBufferCap);
 109:   }
 110: 
 111:   /**
 112:    * Constructs a reader that decodes bytes from the given channel according to
 113:    * the named charset.
 114:    *
 115:    * @exception UnsupportedCharsetException If no support for the named charset
 116:    * is available in this instance of the Java virtual machine.
 117:    */
 118:   public static Reader newReader(ReadableByteChannel ch, String csName)
 119:   {
 120:     return newReader(ch, Charset.forName(csName).newDecoder(), -1);
 121:   }
 122: 
 123:   /**
 124:    * Constructs a writer that encodes characters using the given encoder and
 125:    * writes the resulting bytes to the given channel.
 126:    */
 127:   public static Writer newWriter(WritableByteChannel ch, CharsetEncoder enc,
 128:                                  int minBufferCap)
 129:   {
 130:     return new ChannelWriter(ch, enc, minBufferCap);
 131:   }
 132: 
 133:   /**
 134:    * Constructs a writer that encodes characters according to the named charset
 135:    * and writes the resulting bytes to the given channel.
 136:    *
 137:    * @exception UnsupportedCharsetException If no support for the named charset
 138:    * is available in this instance of the Java virtual machine.
 139:    */
 140:   public static Writer newWriter(WritableByteChannel ch, String csName)
 141:   {
 142:     return newWriter(ch, Charset.forName(csName).newEncoder(), -1);
 143:   }
 144: }