# SessionInfo.java

    /*******************************************************************************
     * Copyright (c) 2009, 2013 Mountainminds GmbH & Co. KG and Contributors
     * All rights reserved. This program and the accompanying materials
     * are made available under the terms of the Eclipse Public License v1.0
     * which accompanies this distribution, and is available at
     * http://www.eclipse.org/legal/epl-v10.html
     *
     * Contributors:
     *    Marc R. Hoffmann - initial API and implementation
     *
     *******************************************************************************/
    package org.jacoco.core.data;

    /**
     * Data object describing a session which was the source of execution data.
     * {@link SessionInfo} instances can be sorted by dump date through the
     * {@link Comparable} interface.
     */
    public class SessionInfo implements Comparable<SessionInfo> {

    	private final String id;

    	private final long start;

    	private final long dump;

    	/**
    	 * Create a immutable session info with the given data.
    	 *
    	 * @param id
    	 *            arbitrary session identifier, must not be <code>null</code>
    	 * @param start
    	 *            the epoc based time stamp when execution data recording has
    	 *            been started
    	 * @param dump
    	 *            the epoc based time stamp when execution data was collected
    	 */
    	public SessionInfo(final String id, final long start, final long dump) {
    		if (id == null) {
    			throw new IllegalArgumentException();
    		}
    		this.id = id;
    		this.start = start;
    		this.dump = dump;
    	}

    	/**
    	 * @return identifier for this session
    	 */
    	public String getId() {
    		return id;
    	}

    	/**
    	 * @return the epoc based time stamp when execution data recording has been
    	 *         started
    	 */
    	public long getStartTimeStamp() {
    		return start;
    	}

    	/**
    	 * @return the epoc based time stamp when execution data was collected
    	 */
    	public long getDumpTimeStamp() {
    		return dump;
    	}

    	public int compareTo(final SessionInfo other) {
    		if (this.dump < other.dump) {
    			return -1;
    		}
    		if (this.dump > other.dump) {
    			return +1;
    		}
    		return 0;
    	}

    	@Override
    	public String toString() {
    		return "SessionInfo[" + id + "]";
    	}
    }