/*
* Copyright (c) 2013, 2014, 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.awt.X11;
import java.security.AccessController;
import sun.awt.SunToolkit;
import sun.security.action.GetBooleanAction;
import sun.util.logging.PlatformLogger;
/**
* This class contains code of the global toolkit error handler, exposes static
* methods which allow to set and unset synthetic error handlers.
*/
public final class XErrorHandlerUtil {
private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XErrorHandlerUtil");
/**
* The connection to X11 window server.
*/
private static long display;
/**
* Error handler at the moment of {@code XErrorHandlerUtil} initialization.
*/
private static long saved_error_handler;
/**
* XErrorEvent being handled.
*/
static volatile XErrorEvent saved_error;
/**
* Current error handler or null if no error handler is set.
*/
private static XErrorHandler current_error_handler;
/**
* Value of sun.awt.noisyerrorhandler system property.
*/
private static boolean noisyAwtHandler = AccessController.doPrivileged(
new GetBooleanAction("sun.awt.noisyerrorhandler"));
/**
* The flag indicating that {@code init} was called already.
*/
private static boolean initPassed;
/**
* Guarantees that no instance of this class can be created.
*/
private XErrorHandlerUtil() {}
/**
* Sets the toolkit global error handler, stores the connection to X11 server,
* which will be used during an error handling process. This method is called
* once from {@code awt_init_Display} function defined in {@code awt_GraphicsEnv.c}
* file immediately after the connection to X11 window server is opened.
* @param display the connection to X11 server which should be stored
*/
private static void init(long display) {
SunToolkit.awtLock();
try {
if (!initPassed) {
XErrorHandlerUtil.display = display;
saved_error_handler = XlibWrapper.SetToolkitErrorHandler();
initPassed = true;
}
} finally {
SunToolkit.awtUnlock();
}
}
/**
* Sets a synthetic error handler. Must be called with the acquired AWT lock.
* @param handler the synthetic error handler to set
*/
public static void WITH_XERROR_HANDLER(XErrorHandler handler) {
XSync();
saved_error = null;
current_error_handler = handler;
}
/**
* Unsets a current synthetic error handler. Must be called with the acquired AWT lock.
*/
public static void RESTORE_XERROR_HANDLER() {
// Wait until all requests are processed by the X server
// and only then uninstall the error handler.
XSync();
current_error_handler = null;
}
/**
* Should be called under LOCK.
*/
public static int SAVED_XERROR_HANDLER(long display, XErrorEvent error) {
if (saved_error_handler != 0) {
// Default XErrorHandler may just terminate the process. Don't call it.
// return XlibWrapper.CallErrorHandler(saved_error_handler, display, error.pData);
}
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("Unhandled XErrorEvent: " +
"id=" + error.get_resourceid() + ", " +
"serial=" + error.get_serial() + ", " +
"ec=" + error.get_error_code() + ", " +
"rc=" + error.get_request_code() + ", " +
"mc=" + error.get_minor_code());
}
return 0;
}
/**
* Called from the native code when an error occurs.
*/
private static int globalErrorHandler(long display, long event_ptr) {
if (noisyAwtHandler) {
XlibWrapper.PrintXErrorEvent(display, event_ptr);
}
XErrorEvent event = new XErrorEvent(event_ptr);
/**代码未完, 请加载全部代码(NowJava.com).**/