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1: /* ChannelInputStream.java -- 2: Copyright (C) 2003 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 gnu.java.nio; 40: 41: import java.io.IOException; 42: import java.io.InputStream; 43: import java.nio.ByteBuffer; 44: import java.nio.channels.IllegalBlockingModeException; 45: import java.nio.channels.ReadableByteChannel; 46: import java.nio.channels.SelectableChannel; 47: 48: /** 49: * @author Michael Koch 50: */ 51: public final class ChannelInputStream extends InputStream 52: { 53: private ReadableByteChannel ch; 54: 55: public ChannelInputStream (ReadableByteChannel ch) 56: { 57: super(); 58: 59: this.ch = ch; 60: } 61: 62: public int read() throws IOException 63: { 64: if (ch instanceof SelectableChannel 65: && (! ((SelectableChannel) ch).isBlocking())) 66: throw new IllegalBlockingModeException(); 67: 68: ByteBuffer buffer = ByteBuffer.allocate(1); 69: int result = ch.read(buffer); 70: 71: if (result == -1) 72: return -1; 73: 74: if (result == 0) 75: throw new IOException("Could not read from channel"); 76: 77: return buffer.get(0); 78: } 79: }