Showing the changes to java/pkg/sun/net/httpserver/LeftOverInputStream.java (1 of 18352 files). Show all
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| 1 | /* | ||
| 2 | * Copyright (c) 2005, 2007, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * 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 | } | ||