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'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.

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/*
 * Copyright (C) 2004-2014 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);
	}

}