J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005-2007 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.net.httpserver; |
| 27 | |
| 28 | import java.io.*; |
| 29 | import com.sun.net.httpserver.*; |
| 30 | import com.sun.net.httpserver.spi.*; |
| 31 | |
| 32 | /** |
| 33 | * a (filter) input stream which can tell us if bytes are "left over" |
| 34 | * on the underlying stream which can be read (without blocking) |
| 35 | * on another instance of this class. |
| 36 | * |
| 37 | * The class can also report if all bytes "expected" to be read |
| 38 | * were read, by the time close() was called. In that case, |
| 39 | * bytes may be drained to consume them (by calling drain() ). |
| 40 | * |
| 41 | * isEOF() returns true, when all expected bytes have been read |
| 42 | */ |
| 43 | abstract class LeftOverInputStream extends FilterInputStream { |
| 44 | ExchangeImpl t; |
| 45 | ServerImpl server; |
| 46 | protected boolean closed = false; |
| 47 | protected boolean eof = false; |
| 48 | byte[] one = new byte [1]; |
| 49 | |
| 50 | public LeftOverInputStream (ExchangeImpl t, InputStream src) { |
| 51 | super (src); |
| 52 | this.t = t; |
| 53 | this.server = t.getServerImpl(); |
| 54 | } |
| 55 | /** |
| 56 | * if bytes are left over buffered on *the UNDERLYING* stream |
| 57 | */ |
| 58 | public boolean isDataBuffered () throws IOException { |
| 59 | assert eof; |
| 60 | return super.available() > 0; |
| 61 | } |
| 62 | |
| 63 | public void close () throws IOException { |
| 64 | if (closed) { |
| 65 | return; |
| 66 | } |
| 67 | closed = true; |
| 68 | if (!eof) { |
| 69 | eof = drain (ServerConfig.getDrainAmount()); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | public boolean isClosed () { |
| 74 | return closed; |
| 75 | } |
| 76 | |
| 77 | public boolean isEOF () { |
| 78 | return eof; |
| 79 | } |
| 80 | |
| 81 | protected abstract int readImpl (byte[]b, int off, int len) throws IOException; |
| 82 | |
| 83 | public synchronized int read () throws IOException { |
| 84 | if (closed) { |
| 85 | throw new IOException ("Stream is closed"); |
| 86 | } |
| 87 | int c = readImpl (one, 0, 1); |
| 88 | if (c == -1 || c == 0) { |
| 89 | return c; |
| 90 | } else { |
| 91 | return one[0] & 0xFF; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | public synchronized int read (byte[]b, int off, int len) throws IOException { |
| 96 | if (closed) { |
| 97 | throw new IOException ("Stream is closed"); |
| 98 | } |
| 99 | return readImpl (b, off, len); |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * read and discard up to l bytes or "eof" occurs, |
| 104 | * (whichever is first). Then return true if the stream |
| 105 | * is at eof (ie. all bytes were read) or false if not |
| 106 | * (still bytes to be read) |
| 107 | */ |
| 108 | public boolean drain (long l) throws IOException { |
| 109 | int bufSize = 2048; |
| 110 | byte[] db = new byte [bufSize]; |
| 111 | while (l > 0) { |
| 112 | long len = readImpl (db, 0, bufSize); |
| 113 | if (len == -1) { |
| 114 | eof = true; |
| 115 | return true; |
| 116 | } else { |
| 117 | l = l - len; |
| 118 | } |
| 119 | } |
| 120 | return false; |
| 121 | } |
| 122 | } |