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/*-
 * ============LICENSE_START=======================================================
 * org.openecomp.aai
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.aai.logging;

import org.openecomp.aai.logging.LoggingContext.LoggingField;

import ch.qos.logback.classic.pattern.ClassicConverter;
import ch.qos.logback.classic.spi.ILoggingEvent;

public class EcompElapsedTime extends ClassicConverter {

	private static final String DEFAULT_ELAPSED_TIME_FORMAT = "%d";

	private String ELAPSED_TIME_FORMAT;

	@Override
	public void start() {
		ELAPSED_TIME_FORMAT = getFirstOption();
	}

	@Override
	public String convert(ILoggingEvent event) {
		final long end = event.getTimeStamp();

		if (!event.getMDCPropertyMap().containsKey(LoggingField.START_TIME.toString())) {
			return format(0);
		} else if (event.getMDCPropertyMap().containsKey(LoggingField.ELAPSED_TIME.toString())) {
			return format(
						Integer.parseInt(event.getMDCPropertyMap().get(LoggingField.ELAPSED_TIME.toString()))
					);
		}

		final long start = LogFormatTools.toTimestamp(event.getMDCPropertyMap().get(LoggingField.START_TIME.toString()));

		return format(end - start);
	}

	private String format(long elapsedTime) {
		if (ELAPSED_TIME_FORMAT == null) {
			return format(DEFAULT_ELAPSED_TIME_FORMAT, elapsedTime);
		}

		return format (ELAPSED_TIME_FORMAT, elapsedTime);
	}

	private String format(String format, long elapsedTime) {
		return String.format(format, elapsedTime);
	}
}