author | ohair |
Tue, 10 Apr 2012 08:22:03 -0700 | |
changeset 12317 | 9670c1610c53 |
parent 11823 | ee83ae88512d |
child 12813 | c10ab96dcf41 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2003, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.nio.ch; |
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import javax.tools.annotation.GenerateNativeHeader; |
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// Constants for reporting I/O status |
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/* No native methods here, but the constants are needed in the supporting JNI code */ |
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@GenerateNativeHeader |
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public final class IOStatus { |
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private IOStatus() { } |
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public static final int EOF = -1; // End of file |
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public static final int UNAVAILABLE = -2; // Nothing available (non-blocking) |
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public static final int INTERRUPTED = -3; // System call interrupted |
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public static final int UNSUPPORTED = -4; // Operation not supported |
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public static final int THROWN = -5; // Exception thrown in JNI code |
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public static final int UNSUPPORTED_CASE = -6; // This case not supported |
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// The following two methods are for use in try/finally blocks where a |
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// status value needs to be normalized before being returned to the invoker |
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// but also checked for illegal negative values before the return |
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// completes, like so: |
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// |
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// int n = 0; |
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// try { |
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// begin(); |
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// n = op(fd, buf, ...); |
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// return IOStatus.normalize(n); // Converts UNAVAILABLE to zero |
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// } finally { |
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// end(n > 0); |
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// assert IOStatus.check(n); // Checks other negative values |
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// } |
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// |
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public static int normalize(int n) { |
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if (n == UNAVAILABLE) |
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return 0; |
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return n; |
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} |
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public static boolean check(int n) { |
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return (n >= UNAVAILABLE); |
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} |
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public static long normalize(long n) { |
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if (n == UNAVAILABLE) |
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return 0; |
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return n; |
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} |
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public static boolean check(long n) { |
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return (n >= UNAVAILABLE); |
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} |
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// Return true iff n is not one of the IOStatus values |
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public static boolean checkAll(long n) { |
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return ((n > EOF) || (n < UNSUPPORTED_CASE)); |
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} |
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} |