org.databene.commons.ErrorHandler Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of databene-commons Show documentation
'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.
The newest version!
/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.databene.commons;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Provides for error handling by logging and eventually raising an exception.
 * Created at 02.08.2008 13:39:11
 * @since 0.4.5
 * @author Volker Bergmann
 */
public class ErrorHandler {
	
	// attributes ------------------------------------------------------------------------------------------------------

	private Logger logger;
	private Level level;
	private boolean loggingStackTrace;

	// constructors ----------------------------------------------------------------------------------------------------
	
	public ErrorHandler(Class category) {
		this(category.getName());
	}
	
	public ErrorHandler(String category) {
		this(category, Level.fatal);
	}
	
	public ErrorHandler(String category, Level level) {
		this.logger = LoggerFactory.getLogger(category);
		this.level = level;
		this.loggingStackTrace = true;
	}
	
	// interface -------------------------------------------------------------------------------------------------------
	
	public void handleError(String message) {
		switch (level) {
			// yes, this could be more efficient, but it's just for error handling
			// and you're not supposed to have a number of errors that impacts performance
			case trace : logger.trace(message); break;
			case debug : logger.debug(message); break;
			case info  : logger.info( message); break;
			case warn  : logger.warn( message); break;
			case error : logger.error(message); break;
			case fatal : logger.error(message);
						 throw new RuntimeException(message);
			case ignore: // ignore
		}
	}

	public void handleError(String message, Throwable t) {
		if (loggingStackTrace) {
			switch (level) {
				// yes, this could be more efficient, but it's just for error handling
				// and you're not supposed to have a number of errors that impacts performance
				case trace : logger.trace(message); break;
				case debug : logger.debug(message); break;
				case info  : logger.info( message); break;
				case warn  : logger.warn( message); break;
				case error : logger.error(message, t); break;
				case fatal : if (t instanceof RuntimeException)
								throw (RuntimeException) t;
							 else
								throw new RuntimeException(t);
				case ignore: break; // ignore
			}
		} else
			handleError(message + SystemInfo.getLineSeparator() + t.toString());
	}

	// properties ------------------------------------------------------------------------------------------------------
	
	public Level getLevel() {
		return level;
	}

	public boolean isLoggingStackTrace() {
		return loggingStackTrace;
	}

	public void setLoggingStackTrace(boolean loggingStackTrace) {
		this.loggingStackTrace = loggingStackTrace;
	}
	
	// static utilities ------------------------------------------------------------------------------------------------

	private static ErrorHandler defaultInstance = new ErrorHandler(ErrorHandler.class);
	
	public static ErrorHandler getDefault() {
		return defaultInstance;
    }

	private static Level defaultLevel = Level.fatal;
	
	public static Level getDefaultLevel() {
		return defaultLevel;
	}
	
	public static void setDefaultLevel(Level level) {
		defaultLevel = level;
		if (defaultInstance.getLevel() != level)
			defaultInstance = new ErrorHandler(defaultInstance.logger.getName(), level);
	}

}