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.ChannelInputStream;
  42: import gnu.java.nio.ChannelOutputStream;
  43: import gnu.java.nio.ChannelReader;
  44: import gnu.java.nio.InputStreamChannel;
  45: import gnu.java.nio.OutputStreamChannel;
  46: import gnu.java.nio.channels.FileChannelImpl;
  47: 
  48: import java.io.FileInputStream;
  49: import java.io.FileOutputStream;
  50: import java.io.InputStream;
  51: import java.io.OutputStream;
  52: import java.io.Reader;
  53: import java.io.Writer;
  54: import java.nio.charset.Charset;
  55: import java.nio.charset.CharsetDecoder;
  56: import java.nio.charset.CharsetEncoder;
  57: 
  58: 
  59: /**
  60:  * @since 1.4
  61:  */
  62: public final class Channels
  63: {
  64:   /**
  65:    * This class isn't intended to be instantiated.
  66:    */
  67:   private Channels()
  68:   {
  69:     // Do nothing here.
  70:   }
  71: 
  72:   /**
  73:    * Constructs a stream that reads bytes from the given channel.
  74:    */
  75:   public static InputStream newInputStream(ReadableByteChannel ch)
  76:   {
  77:     if (ch instanceof FileChannelImpl)
  78:       return newInputStream((FileChannelImpl) ch);
  79:     return new ChannelInputStream(ch);
  80:   }
  81: 
  82:   /**
  83:    * Constructs a stream that writes bytes to the given channel.
  84:    */
  85:   public static OutputStream newOutputStream(WritableByteChannel ch)
  86:   {
  87:     if (ch instanceof FileChannelImpl)
  88:       return newOutputStream((FileChannelImpl) ch);
  89:     return new ChannelOutputStream(ch);
  90:   }
  91: 
  92:   static native FileInputStream newInputStream(FileChannelImpl ch);
  93: 
  94:   static native FileOutputStream newOutputStream(FileChannelImpl ch);
  95: 
  96:   /**
  97:    * Constructs a channel that reads bytes from the given stream.
  98:    */
  99:   public static ReadableByteChannel newChannel(InputStream in)
 100:   {
 101:     return new InputStreamChannel(in);
 102:   }
 103: 
 104:   /**
 105:    * Constructs a channel that writes bytes to the given stream.
 106:    */
 107:   public static WritableByteChannel newChannel(OutputStream out)
 108:   {
 109:     return new OutputStreamChannel(out);
 110:   }
 111: 
 112:   /**
 113:    * Constructs a reader that decodes bytes from the given channel using the
 114:    * given decoder.
 115:    */
 116:   public static Reader newReader(ReadableByteChannel ch, CharsetDecoder dec,
 117:                                  int minBufferCap)
 118:   {
 119:     return new ChannelReader(ch, dec, minBufferCap);
 120:   }
 121: 
 122:   /**
 123:    * Constructs a reader that decodes bytes from the given channel according to
 124:    * the named charset.
 125:    *
 126:    * @exception UnsupportedCharsetException If no support for the named charset
 127:    * is available in this instance of the Java virtual machine.
 128:    */
 129:   public static Reader newReader(ReadableByteChannel ch, String csName)
 130:   {
 131:     return newReader(ch, Charset.forName(csName).newDecoder(), -1);
 132:   }
 133: 
 134:   /**
 135:    * Constructs a writer that encodes characters using the given encoder and
 136:    * writes the resulting bytes to the given channel.
 137:    */
 138:   public static Writer newWriter(WritableByteChannel ch, CharsetEncoder enc,
 139:                                  int minBufferCap)
 140:   {
 141:     // FIXME: implement java.nio.channels.Channel.newWriter(WritableByteChannel, CharsetEncoder, int) 
 142:     throw new Error("not implemented");
 143:   }
 144: 
 145:   /**
 146:    * Constructs a writer that encodes characters according to the named charset
 147:    * and writes the resulting bytes to the given channel.
 148:    *
 149:    * @exception UnsupportedCharsetException If no support for the named charset
 150:    * is available in this instance of the Java virtual machine.
 151:    */
 152:   public static Writer newWriter(WritableByteChannel ch, String csName)
 153:   {
 154:     return newWriter(ch, Charset.forName(csName).newEncoder(), -1);
 155:   }
 156: }