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/*******************************************************************************
* Copyright (c) 2010-2013, Bergmann Gabor, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.util;
import org.apache.log4j.Logger;
import tools.refinery.viatra.runtime.matchers.util.Preconditions;
/**
* Centralized logger of the VIATRA Query runtime.
* @author Bergmann Gabor
*
*/
public class ViatraQueryLoggingUtil {
private ViatraQueryLoggingUtil() {/*Utility class constructor*/}
private static Logger externalLogger;
public static void setExternalLogger(Logger externalLogger) {
Preconditions.checkArgument(externalLogger != null, "Must not set up null logger");
ViatraQueryLoggingUtil.externalLogger = externalLogger;
}
/**
* Provides a static default logger.
*/
public static Logger getDefaultLogger() {
if (defaultRuntimeLogger == null) {
Logger parentLogger = externalLogger;
if (parentLogger == null) {
defaultRuntimeLogger = Logger.getLogger("org.eclipse.viatra");
} else {
defaultRuntimeLogger = Logger.getLogger(parentLogger.getName() + ".runtime");
}
if (defaultRuntimeLogger == null)
throw new AssertionError("Configuration error: unable to create default VIATRA Query runtime logger.");
}
return defaultRuntimeLogger;
}
private static String getLoggerClassname(Class<?> clazz) {
return clazz.getName().startsWith(getDefaultLogger().getName())
? clazz.getName()
: getDefaultLogger().getName() + "." + clazz.getName();
}
/**
* Provides a class-specific logger that also stores the global logger settings of the VIATRA Query runtime
* @param clazz
*/
public static Logger getLogger(Class<?> clazz) {
return Logger.getLogger(getLoggerClassname(clazz));
}
/**
* Provides a named logger that also stores the global logger settings of the VIATRA Query runtime
* @param clazz
* @param name a non-empty name to append to the class names
* @since 2.5
*/
public static Logger getLogger(Class<?> clazz, String name) {
return Logger.getLogger(getLoggerClassname(clazz) + '.' + name);
}
private static Logger defaultRuntimeLogger;
}
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