Mercurial > hg > truffle
diff 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> |
---|---|
date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.base/src/com/sun/max/program/ProgramWarning.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,84 @@ +/* + * Copyright (c) 2007, 2011, 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. + * + * 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 com.sun.max.program; + +/** + * A collection of static methods for reporting a warning when an unexpected, non-fatal condition is encountered. + */ +public final class ProgramWarning { + + /** + * Implemented by a client that can {@linkplain ProgramWarning#setHandler(Handler) register} + * itself to handle program warnings instead of having them printed to {@link System#err}. + */ + public interface Handler { + + /** + * Handles display a given warning message. + * + * @param message a warning message + */ + void handle(String message); + } + + /** + * Registers a handler to which warnings are redirected. Any previously registered handler + * is overwritten and discarded. + * + * @param h if non-null, this object's {@link Handler#handle(String)} method is messaged instead of + * printing the warning to {@link System#err} a ProgramError. + */ + public static void setHandler(Handler h) { + handler = h; + } + + private static Handler handler; + + private ProgramWarning() { + } + + /** + * Prints a given warning message. + * + * @param warning the warning message to print + */ + public static void message(String warning) { + if (handler != null) { + handler.handle(warning); + } else { + System.err.println("WARNING: " + warning); + } + } + + /** + * Checks a given condition and if it's {@code false}, the appropriate warning message is printed. + * + * @param condition a condition to test + * @param message the warning message to be printed if {@code condition == false} + */ + public static void check(boolean condition, String warning) { + if (!condition) { + message(warning); + } + } +}