Showing the changes to java/pkg/sun/nio/ch/IOStatus.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,83 @@ | ||
| 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 | +} | |