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 }