/* * Copyright (c) 2002, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.nio.ch;  // Constants for reporting I/O status final class IOStatus {     private IOStatus() { }     static final int EOF = -1;              // End of file    static final int UNAVAILABLE = -2;      // Nothing available (non-blocking)    static final int INTERRUPTED = -3;      // System call interrupted    static final int UNSUPPORTED = -4;      // Operation not supported    static final int THROWN = -5;           // Exception thrown in JNI code    static final int UNSUPPORTED_CASE = -6; // This case not supported     // The following two methods are for use in try/finally blocks where a    // status value needs to be normalized before being returned to the invoker    // but also checked for illegal negative values before the return    // completes, like so:    //    //     int n = 0;    //     try {    //         begin();    //         n = op(fd, buf, ...);    //         return IOStatus.normalize(n);    // Converts UNAVAILABLE to zero    //     } finally {    //         end(n > 0);    //         assert IOStatus.check(n);        // Checks other negative values    //     }    //     static int normalize(int n) {        if (n == UNAVAILABLE)            return 0;        return n;    }     static boolean check(int n) {        return (n >= UNAVAILABLE);    }     static long normalize(long n) {        if (n == UNAVAILABLE)            return 0;        return n;    }     static boolean check(long n) {        return (n >= UNAVAILABLE);    }     // Return true iff n is not one of the IOStatus values    static boolean checkAll(long n) {        return ((n > EOF) || (n < UNSUPPORTED_CASE));    } }