Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/program/ProgramWarning.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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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 } |