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.InputStreamChannel;
  43: import gnu.java.nio.OutputStreamChannel;
  44: 
  45: import java.io.InputStream;
  46: import java.io.OutputStream;
  47: import java.io.Reader;
  48: import java.io.Writer;
  49: import java.nio.charset.Charset;
  50: import java.nio.charset.CharsetDecoder;
  51: import java.nio.charset.CharsetEncoder;
  52: 
  53: 
  54: /**
  55:  * @since 1.4
  56:  */
  57: public final class Channels
  58: {
  59:   /**
  60:    * This class isn't intended to be instantiated.
  61:    */
  62:   private Channels()
  63:   {
  64:     // Do nothing here.
  65:   }
  66: 
  67:   /**
  68:    * Constructs a stream that reads bytes from the given channel.
  69:    */
  70:   public static InputStream newInputStream(ReadableByteChannel ch)
  71:   {
  72:     return VMChannels.newInputStream(ch);
  73:   }
  74: 
  75:   /**
  76:    * Constructs a stream that writes bytes to the given channel.
  77:    */
  78:   public static OutputStream newOutputStream(WritableByteChannel ch)
  79:   {
  80:     return VMChannels.newOutputStream(ch);
  81:   }
  82: 
  83:   /**
  84:    * Constructs a channel that reads bytes from the given stream.
  85:    */
  86:   public static ReadableByteChannel newChannel(InputStream in)
  87:   {
  88:     return new InputStreamChannel(in);
  89:   }
  90: 
  91:   /**
  92:    * Constructs a channel that writes bytes to the given stream.
  93:    */
  94:   public static WritableByteChannel newChannel(OutputStream out)
  95:   {
  96:     return new OutputStreamChannel(out);
  97:   }
  98: 
  99:   /**
 100:    * Constructs a reader that decodes bytes from the given channel using the
 101:    * given decoder.
 102:    */
 103:   public static Reader newReader(ReadableByteChannel ch, CharsetDecoder dec,
 104:                                  int minBufferCap)
 105:   {
 106:     return new ChannelReader(ch, dec, minBufferCap);
 107:   }
 108: 
 109:   /**
 110:    * Constructs a reader that decodes bytes from the given channel according to
 111:    * the named charset.
 112:    *
 113:    * @exception UnsupportedCharsetException If no support for the named charset
 114:    * is available in this instance of the Java virtual machine.
 115:    */
 116:   public static Reader newReader(ReadableByteChannel ch, String csName)
 117:   {
 118:     return newReader(ch, Charset.forName(csName).newDecoder(), -1);
 119:   }
 120: 
 121:   /**
 122:    * Constructs a writer that encodes characters using the given encoder and
 123:    * writes the resulting bytes to the given channel.
 124:    */
 125:   public static Writer newWriter(WritableByteChannel ch, CharsetEncoder enc,
 126:                                  int minBufferCap)
 127:   {
 128:     // FIXME: implement java.nio.channels.Channel.newWriter(WritableByteChannel, CharsetEncoder, int) 
 129:     throw new Error("not implemented");
 130:   }
 131: 
 132:   /**
 133:    * Constructs a writer that encodes characters according to the named charset
 134:    * and writes the resulting bytes to the given channel.
 135:    *
 136:    * @exception UnsupportedCharsetException If no support for the named charset
 137:    * is available in this instance of the Java virtual machine.
 138:    */
 139:   public static Writer newWriter(WritableByteChannel ch, String csName)
 140:   {
 141:     return newWriter(ch, Charset.forName(csName).newEncoder(), -1);
 142:   }
 143: }