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 }