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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.ChannelReader; 42: import gnu.java.nio.ChannelWriter; 43: import gnu.java.nio.InputStreamChannel; 44: import gnu.java.nio.OutputStreamChannel; 45: 46: import java.io.InputStream; 47: import java.io.OutputStream; 48: import java.io.Reader; 49: import java.io.Writer; 50: import java.nio.charset.Charset; 51: import java.nio.charset.CharsetDecoder; 52: import java.nio.charset.CharsetEncoder; 53: import java.nio.charset.UnsupportedCharsetException; 54: 55: 56: /** 57: * @since 1.4 58: */ 59: public final class Channels 60: { 61: /** 62: * This class isn't intended to be instantiated. 63: */ 64: private Channels() 65: { 66: // Do nothing here. 67: } 68: 69: /** 70: * Constructs a stream that reads bytes from the given channel. 71: */ 72: public static InputStream newInputStream(ReadableByteChannel ch) 73: { 74: return VMChannels.newInputStream(ch); 75: } 76: 77: /** 78: * Constructs a stream that writes bytes to the given channel. 79: */ 80: public static OutputStream newOutputStream(WritableByteChannel ch) 81: { 82: return VMChannels.newOutputStream(ch); 83: } 84: 85: /** 86: * Constructs a channel that reads bytes from the given stream. 87: */ 88: public static ReadableByteChannel newChannel(InputStream in) 89: { 90: return new InputStreamChannel(in); 91: } 92: 93: /** 94: * Constructs a channel that writes bytes to the given stream. 95: */ 96: public static WritableByteChannel newChannel(OutputStream out) 97: { 98: return new OutputStreamChannel(out); 99: } 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: }