J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.nio.ch; |
| 27 | |
| 28 | import java.io.*; |
| 29 | import java.nio.*; |
| 30 | import java.nio.channels.*; |
| 31 | import java.nio.channels.spi.*; |
| 32 | |
| 33 | |
| 34 | /** |
| 35 | * This class is defined here rather than in java.nio.channels.Channels |
| 36 | * so that code can be shared with SocketAdaptor. |
| 37 | * |
| 38 | * @author Mike McCloskey |
| 39 | * @author Mark Reinhold |
| 40 | * @since 1.4 |
| 41 | */ |
| 42 | |
| 43 | public class ChannelInputStream |
| 44 | extends InputStream |
| 45 | { |
| 46 | |
| 47 | public static int read(ReadableByteChannel ch, ByteBuffer bb, |
| 48 | boolean block) |
| 49 | throws IOException |
| 50 | { |
| 51 | if (ch instanceof SelectableChannel) { |
| 52 | SelectableChannel sc = (SelectableChannel)ch; |
| 53 | synchronized (sc.blockingLock()) { |
| 54 | boolean bm = sc.isBlocking(); |
| 55 | if (!bm) |
| 56 | throw new IllegalBlockingModeException(); |
| 57 | if (bm != block) |
| 58 | sc.configureBlocking(block); |
| 59 | int n = ch.read(bb); |
| 60 | if (bm != block) |
| 61 | sc.configureBlocking(bm); |
| 62 | return n; |
| 63 | } |
| 64 | } else { |
| 65 | return ch.read(bb); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | protected final ReadableByteChannel ch; |
| 70 | private ByteBuffer bb = null; |
| 71 | private byte[] bs = null; // Invoker's previous array |
| 72 | private byte[] b1 = null; |
| 73 | |
| 74 | public ChannelInputStream(ReadableByteChannel ch) { |
| 75 | this.ch = ch; |
| 76 | } |
| 77 | |
| 78 | public synchronized int read() throws IOException { |
| 79 | if (b1 == null) |
| 80 | b1 = new byte[1]; |
| 81 | int n = this.read(b1); |
| 82 | if (n == 1) |
| 83 | return b1[0] & 0xff; |
| 84 | return -1; |
| 85 | } |
| 86 | |
| 87 | public synchronized int read(byte[] bs, int off, int len) |
| 88 | throws IOException |
| 89 | { |
| 90 | if ((off < 0) || (off > bs.length) || (len < 0) || |
| 91 | ((off + len) > bs.length) || ((off + len) < 0)) { |
| 92 | throw new IndexOutOfBoundsException(); |
| 93 | } else if (len == 0) |
| 94 | return 0; |
| 95 | |
| 96 | ByteBuffer bb = ((this.bs == bs) |
| 97 | ? this.bb |
| 98 | : ByteBuffer.wrap(bs)); |
| 99 | bb.limit(Math.min(off + len, bb.capacity())); |
| 100 | bb.position(off); |
| 101 | this.bb = bb; |
| 102 | this.bs = bs; |
| 103 | return read(bb); |
| 104 | } |
| 105 | |
| 106 | protected int read(ByteBuffer bb) |
| 107 | throws IOException |
| 108 | { |
| 109 | return ChannelInputStream.read(ch, bb, true); |
| 110 | } |
| 111 | |
| 112 | public void close() throws IOException { |
| 113 | ch.close(); |
| 114 | } |
| 115 | |
| 116 | } |