001/* Channels.java -- 002 Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package java.nio.channels; 040 041import gnu.java.nio.ChannelReader; 042import gnu.java.nio.ChannelWriter; 043import gnu.java.nio.InputStreamChannel; 044import gnu.java.nio.OutputStreamChannel; 045 046import java.io.InputStream; 047import java.io.OutputStream; 048import java.io.Reader; 049import java.io.Writer; 050import java.nio.charset.Charset; 051import java.nio.charset.CharsetDecoder; 052import java.nio.charset.CharsetEncoder; 053import java.nio.charset.UnsupportedCharsetException; 054 055 056/** 057 * @since 1.4 058 */ 059public 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}