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| 1 | /* | ||
| 2 | * Copyright (c) 2002, 2003, 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.nio.ch; | ||
| 27 | |||
| 28 | |||
| 29 | // Constants for reporting I/O status | ||
| 30 | |||
| 31 | final class IOStatus { | ||
| 32 | |||
| 33 | private IOStatus() { } | ||
| 34 | |||
| 35 | static final int EOF = -1; // End of file | ||
| 36 | static final int UNAVAILABLE = -2; // Nothing available (non-blocking) | ||
| 37 | static final int INTERRUPTED = -3; // System call interrupted | ||
| 38 | static final int UNSUPPORTED = -4; // Operation not supported | ||
| 39 | static final int THROWN = -5; // Exception thrown in JNI code | ||
| 40 | static final int UNSUPPORTED_CASE = -6; // This case not supported | ||
| 41 | |||
| 42 | // The following two methods are for use in try/finally blocks where a | ||
| 43 | // status value needs to be normalized before being returned to the invoker | ||
| 44 | // but also checked for illegal negative values before the return | ||
| 45 | // completes, like so: | ||
| 46 | // | ||
| 47 | // int n = 0; | ||
| 48 | // try { | ||
| 49 | // begin(); | ||
| 50 | // n = op(fd, buf, ...); | ||
| 51 | // return IOStatus.normalize(n); // Converts UNAVAILABLE to zero | ||
| 52 | // } finally { | ||
| 53 | // end(n > 0); | ||
| 54 | // assert IOStatus.check(n); // Checks other negative values | ||
| 55 | // } | ||
| 56 | // | ||
| 57 | |||
| 58 | static int normalize(int n) { | ||
| 59 | if (n == UNAVAILABLE) | ||
| 60 | return 0; | ||
| 61 | return n; | ||
| 62 | } | ||
| 63 | |||
| 64 | static boolean check(int n) { | ||
| 65 | return (n >= UNAVAILABLE); | ||
| 66 | } | ||
| 67 | |||
| 68 | static long normalize(long n) { | ||
| 69 | if (n == UNAVAILABLE) | ||
| 70 | return 0; | ||
| 71 | return n; | ||
| 72 | } | ||
| 73 | |||
| 74 | static boolean check(long n) { | ||
| 75 | return (n >= UNAVAILABLE); | ||
| 76 | } | ||
| 77 | |||
| 78 | // Return true iff n is not one of the IOStatus values | ||
| 79 | static boolean checkAll(long n) { | ||
| 80 | return ((n > EOF) || (n < UNSUPPORTED_CASE)); | ||
| 81 | } | ||
| 82 | |||
| 83 | } | ||