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/**
 * PROPRIETARY/CONFIDENTIAL.  Use of this product is subject to license terms.
 *
 * Copyright 2001-2002 by iPlanet/Sun Microsystems, Inc.,
 * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
 * All rights reserved.
 */
package com.sun.enterprise.admin.monitor.types;

/**
 * Monitored attribute type counter. An attribute of Counter type has following
 * properties -
 * <ul>
 * <li>Attribute value is Byte, Short, Integer or Long</li>
 * <li>Attribute value is always greater than or equal to zero</li>
 * <li>Attribute value can only be incremented.</li>
 * <li>Attribute value can roll over and in that case a modulus value is
 * defined.</li>
 * </ul>
 */
public class Counter extends MonitoredAttributeType {

    /**
     * Useful object to denote a monitored attribute whose values are of
     * type java.lang.Byte and maximum value is Byte.MAX_VALUE
     */
    public static final Counter BYTE = new Counter(Byte.TYPE,
            new Byte(Byte.MAX_VALUE));

    /**
     * Useful object to denote a monitored attribute whose values are of
     * type java.lang.Short and maximum value is Short.MAX_VALUE
     */
    public static final Counter SHORT = new Counter(Short.TYPE,
            new Short(Short.MAX_VALUE));

    /**
     * Useful object to denote a monitored attribute whose values are of
     * type java.lang.Integer and maximum value is Integer.MAX_VALUE
     */
    public static final Counter INTEGER = new Counter(Integer.TYPE,
            new Integer(Integer.MAX_VALUE));

    /**
     * Useful object to denote a monitored attribute whose values are of
     * type java.lang.Long and maximum value is Long.MAX_VALUE
     */
    public static final Counter LONG = new Counter(Long.TYPE,
            new Long(Long.MAX_VALUE));

    /**
     * Maximum value for this type
     */
    private Number maxValue;

    /**
     * Create a Type "Counter Monitored Attribute" with specified java type
     * (of the monitored attribute value) and specified maximum value.
     * @param type class of object returned as value for the monitored attribute
     * @param maxVal maximum possible value for this type of monitored attribute
     */
    protected Counter(Class type, Number maxVal) {
        super(type);
        maxValue = maxVal;
    }

    /**
     * Get maximum possible value for this counter. If the attribute value is
     * higher than this number then it will be rolled over.
     */
    public Number getMaxValue() {
        return maxValue;
    }
}