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annotate graal/com.oracle.max.base/src/com/sun/max/program/ProgramWarning.java @ 4138:82af018d61db

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Merge fixes.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 22:03:44 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.program;
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24
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25 /**
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26 * A collection of static methods for reporting a warning when an unexpected, non-fatal condition is encountered.
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27 */
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28 public final class ProgramWarning {
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29
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30 /**
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31 * Implemented by a client that can {@linkplain ProgramWarning#setHandler(Handler) register}
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32 * itself to handle program warnings instead of having them printed to {@link System#err}.
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33 */
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34 public interface Handler {
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35
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36 /**
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37 * Handles display a given warning message.
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38 *
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39 * @param message a warning message
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40 */
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41 void handle(String message);
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42 }
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43
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44 /**
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45 * Registers a handler to which warnings are redirected. Any previously registered handler
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46 * is overwritten and discarded.
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47 *
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48 * @param h if non-null, this object's {@link Handler#handle(String)} method is messaged instead of
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49 * printing the warning to {@link System#err} a ProgramError.
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50 */
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51 public static void setHandler(Handler h) {
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52 handler = h;
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53 }
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54
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55 private static Handler handler;
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56
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57 private ProgramWarning() {
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58 }
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59
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60 /**
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61 * Prints a given warning message.
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62 *
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63 * @param warning the warning message to print
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64 */
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65 public static void message(String warning) {
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66 if (handler != null) {
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67 handler.handle(warning);
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68 } else {
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69 System.err.println("WARNING: " + warning);
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70 }
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71 }
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72
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73 /**
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74 * Checks a given condition and if it's {@code false}, the appropriate warning message is printed.
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75 *
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76 * @param condition a condition to test
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77 * @param message the warning message to be printed if {@code condition == false}
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78 */
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79 public static void check(boolean condition, String warning) {
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80 if (!condition) {
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81 message(warning);
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82 }
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83 }
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84 }