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package com.sun.enterprise.admin.monitor.stats;
import org.glassfish.j2ee.statistics.RangeStatistic;

/** An implementation of a RangeStatistic. All instances of this class are
 * immutable. Provides all the necessary accessors for properties.
 * @author Muralidhar Vempaty
 * @author Kedar Mhaswade
 * @since S1AS8.0
 * @verison 1.0
 */

public final class RangeStatisticImpl extends StatisticImpl implements RangeStatistic {
    
    private final long currentVal;
    private final long highWaterMark;
    private final long lowWaterMark;
    
    /** Constructs an immutable instance of RangeStatistic.
     * @param curVal    The current value of this statistic
     * @param highMark  The highest value of this statistic, since measurement 
     *                  started
     * @param lowMark   The lowest value of this statistic, since measurement
     *                  started
     * @param name      The name of the statistic
     * @param unit      The unit of measurement for this statistic
     * @param desc      A brief description of the statistic
     * @param startTime Time in milliseconds at which the measurement was started
     * @param sampleTime Time at which the last measurement was done.
	 */
    public RangeStatisticImpl(long curVal, long highMark, long lowMark, 
                              String name, String unit, String desc, 
                              long startTime, long sampleTime) {
        
        super(name, unit, desc, startTime, sampleTime);
        currentVal = curVal;
        highWaterMark = highMark;
        lowWaterMark = lowMark;
    }
    
    /**
     * Returns the current value of this statistic.
	 * @return long indicating the current value
     */
    public long getCurrent() {
        return currentVal;
    }
    
    /**
     * Returns the highest value of this statistic, since measurement started.
	 * @return long indicating high water mark
     */
    public long getHighWaterMark() {
        return highWaterMark;
    }
    
    /**
     * Returns the lowest value of this statistic, since measurement started.
	 * @return long indicating low water mark
     */
    public long getLowWaterMark() {
        return lowWaterMark;
    }
    
    public final String toString() {
        return super.toString() + NEWLINE + 
            "Current: " + getCurrent() + NEWLINE +
            "LowWaterMark: " + getLowWaterMark() + NEWLINE +
            "HighWaterMark: " + getHighWaterMark();
    }

}