/*
* Copyright (c) 2009, 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. 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
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* questions.
*/
package sun.util.logging;
import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Date;
/**
* Internal API to support JRE implementation to detect if the java.util.logging
* support is available but with no dependency on the java.util.logging
* classes. This LoggingSupport class provides several static methods to
* access the java.util.logging functionality that requires the caller
* to ensure that the logging support is {@linkplain #isAvailable available}
* before invoking it.
*
* @see sun.util.logging.PlatformLogger if you want to log messages even
* if the logging support is not available
*/
public class LoggingSupport {
private LoggingSupport() { }
private static final LoggingProxy proxy =
AccessController.doPrivileged(new PrivilegedAction<LoggingProxy>() {
public LoggingProxy run() {
try {
// create a LoggingProxyImpl instance when
// java.util.logging classes exist
Class<?> c = Class.forName("java.util.logging.LoggingProxyImpl", true, null);
Field f = c.getDeclaredField("INSTANCE");
f.setAccessible(true);
return (LoggingProxy) f.get(null);
} catch (ClassNotFoundException cnf) {
return null;
} catch (NoSuchFieldException e) {
throw new AssertionError(e);
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}});
/**
* Returns true if java.util.logging support is available.
*/
public static boolean isAvailable() {
return proxy != null;
}
private static void ensureAvailable() {
if (proxy == null)
throw new AssertionError("Should not here");
}
public static java.util.List<String> getLoggerNames() {
ensureAvailable();
return proxy.getLoggerNames();
}
public static String getLoggerLevel(String loggerName) {
ensureAvailable();
return proxy.getLoggerLevel(loggerName);
}
public static void setLoggerLevel(String loggerName, String levelName) {
ensureAvailable();
proxy.setLoggerLevel(loggerName, levelName);
}
public static String getParentLoggerName(String loggerName) {
ensureAvailable();
return proxy.getParentLoggerName(loggerName);
}
public static Object getLogger(String name) {
ensureAvailable();
return proxy.getLogger(name);
}
public static Object getLevel(Object logger) {
ensureAvailable();
return proxy.getLevel(logger);
}
public static void setLevel(Object logger, Object newLevel) {
ensureAvailable();
proxy.setLevel(logger, newLevel);
}
public static boolean isLoggable(Object logger, Object level) {
ensureAvailable();
return proxy.isLoggable(logger,level);
}
public static void log(Object logger, Object level, String msg) {
ensureAvailable();
proxy.log(logger, level, msg);
}
public static void log(Object logger, Object level, String msg, Throwable t) {
ensureAvailable();
proxy.log(logger, level, msg, t);
}
public static void log(Object logger, Object level, String msg, Object... params) {
ensureAvailable();
proxy.log(logger, level, msg, params);
}
public static Object parseLevel(String levelName) {
ensureAvailable();
return proxy.parseLevel(levelName);
}
public static String getLevelName(Object level) {
ensureAvailable();
return proxy.getLevelName(level);
}
public static int getLevelValue(Object level) {
ensureAvailable();
return proxy.getLevelValue(level);
}
private static final String DEFAULT_FORMAT =
"%1$tb %1$td, %1$tY %1$tl:%1$tM:%1$tS %1$Tp %2$s%n%4$s: %5$s%6$s%n";
private static final String FORMAT_PROP_KEY = "java.util.logging.SimpleFormatter.format";
public static String getSimpleFormat() {
return getSimpleFormat(true);
}
// useProxy if true will cause initialization of
// java.util.logging and read its configuration
static String getSimpleFormat(boolean useProxy) {
String format =
AccessController.doPrivileged(
new PrivilegedAction<String>() {
public String run() {
return System.getProperty(FORMAT_PROP_KEY);
}
});
if (useProxy && proxy != null && format == null) {
format = proxy.getProperty(FORMAT_PROP_KEY);
}
if (format != null) {
try {
// validate the user-defined format string
String.format(format, new Date(), "", "", "", "", "");
} catch (IllegalArgumentException e) {
// illegal syntax; fall back to the default format
format = DEFAULT_FORMAT;
}
} else {
format = DEFAULT_FORMAT;
}
return format;
}
}