001    /* Channels.java --
002       Copyright (C) 2002, 2003, 2004, 2005  Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package java.nio.channels;
040    
041    import gnu.java.nio.ChannelReader;
042    import gnu.java.nio.ChannelWriter;
043    import gnu.java.nio.InputStreamChannel;
044    import gnu.java.nio.OutputStreamChannel;
045    
046    import java.io.InputStream;
047    import java.io.OutputStream;
048    import java.io.Reader;
049    import java.io.Writer;
050    import java.nio.charset.Charset;
051    import java.nio.charset.CharsetDecoder;
052    import java.nio.charset.CharsetEncoder;
053    import java.nio.charset.UnsupportedCharsetException;
054    
055    
056    /**
057     * @since 1.4
058     */
059    public final class Channels
060    {
061      /**
062       * This class isn't intended to be instantiated.
063       */
064      private Channels()
065      {
066        // Do nothing here.
067      }
068    
069      /**
070       * Constructs a stream that reads bytes from the given channel.
071       */
072      public static InputStream newInputStream(ReadableByteChannel ch)
073      {
074        return VMChannels.newInputStream(ch);
075      }
076    
077      /**
078       * Constructs a stream that writes bytes to the given channel.
079       */
080      public static OutputStream newOutputStream(WritableByteChannel ch)
081      {
082        return VMChannels.newOutputStream(ch);
083      }
084    
085      /**
086       * Constructs a channel that reads bytes from the given stream.
087       */
088      public static ReadableByteChannel newChannel(InputStream in)
089      {
090        return new InputStreamChannel(in);
091      }
092    
093      /**
094       * Constructs a channel that writes bytes to the given stream.
095       */
096      public static WritableByteChannel newChannel(OutputStream out)
097      {
098        return new OutputStreamChannel(out);
099      }
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    }