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Kieker: Application Performance Monitoring and Dynamic Software Analysis

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/***************************************************************************
 * Copyright 2015 Kieker Project (http://kieker-monitoring.net)
 *
 * 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 kieker.common.logging;

import java.text.DateFormat;
import java.util.Date;
import java.util.logging.Formatter; // NOCS 
import java.util.logging.Level; // NOCS 
import java.util.logging.LogRecord; // NOCS 

/**
 * A formatter for the logging to files which is used by the Kieker tools.
 * 
 * @author Nils Christian Ehmke
 * 
 * @since 1.10
 */
public class SimpleFileLoggingFormatter extends Formatter {

	protected static final String LINE_SEPERATOR = System.getProperty("line.separator");
	private final DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);

	/**
	 * Empty constructor.
	 */
	public SimpleFileLoggingFormatter() {
		// No code necessary
	}

	@Override
	public String format(final LogRecord record) {
		final StringBuilder sb = new StringBuilder();

		this.fillStringBuilderWithMessage(sb, record);

		return sb.toString();
	}

	/**
	 * Populates the string builder with logging information.
	 * 
	 * @param sb
	 *            the string builder
	 * @param record
	 *            one log record to be used for population of the string builder
	 */
	protected void fillStringBuilderWithMessage(final StringBuilder sb, final LogRecord record) {
		final Date date = new Date(record.getMillis());
		final String dateText = this.dateFormat.format(date);

		if ((record.getLevel() == Level.WARNING) || (record.getLevel() == Level.SEVERE)) {
			sb.append(record.getLevel().getLocalizedName());
			sb.append(" (").append(dateText).append("): ");
		}

		sb.append(record.getMessage());
		sb.append(LINE_SEPERATOR);
		final Throwable thrown = record.getThrown();
		if (thrown != null) {
			sb.append(thrown.getLocalizedMessage()).append(LINE_SEPERATOR);
			final StackTraceElement[] stackTrace = thrown.getStackTrace();
			for (final StackTraceElement stackTraceElement : stackTrace) {
				sb.append('\t').append(stackTraceElement).append(LINE_SEPERATOR);
			}
		}
	}
}