/*
 * @(#)file      SnmpCounter64.java
 * @(#)author    Sun Microsystems, Inc.
 * @(#)version   4.8
 * @(#)date      05/04/13
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 */


package com.sun.jmx.snmp;



/**
 * Represents an SNMP 64bits counter.
 *
 * <p><b>This API is a Sun Microsystems internal API  and is subject 
 * to change without notice.</b></p>
 * @version     4.8     12/19/03
 * @author      Sun Microsystems, Inc
 */

public class SnmpCounter64 extends SnmpValue {

    // CONSTRUCTORS
    //-------------
    /**
     * Constructs a new <CODE>SnmpCounter64</CODE> from the specified long value.
     * @param v The initialization value.
     * @exception IllegalArgumentException The specified value is negative
     * or larger than <CODE>Long.MAX_VALUE</CODE>. 
     */
    public SnmpCounter64(long v) throws IllegalArgumentException {

	// NOTE:
	// The max value for a counter64 variable is 2^64 - 1.
	// The max value for a Long is 2^63 - 1.
	// All the allowed values for a conuter64 variable cannot be covered !!!
	//
	if ((v < 0) || (v > Long.MAX_VALUE)) {
	    throw new IllegalArgumentException() ;
	}
	value = v ;
    }
  
    /**
     * Constructs a new <CODE>SnmpCounter64</CODE> from the specified <CODE>Long</CODE> value.
     * @param v The initialization value.
     * @exception IllegalArgumentException The specified value is negative
     * or larger than <CODE>Long.MAX_VALUE</CODE>. 
     */
    public SnmpCounter64(Long v) throws IllegalArgumentException {
	this(v.longValue()) ;
    }
  
    // PUBLIC METHODS
    //---------------
    /**
     * Returns the counter value of this <CODE>SnmpCounter64</CODE>.
     * @return The value.
     */
    public long longValue() {
	return value ;
    }

    /**
     * Converts the counter value to its <CODE>Long</CODE> form.
     * @return The <CODE>Long</CODE> representation of the value.
     */
    public Long toLong() {
	return new Long(value) ;
    }
    
    /**
     * Converts the counter value to its integer form.
     * @return The integer representation of the value.
     */
    public int intValue() {
	return (int)value ;
    }
  
    /**
     * Converts the counter value to its <CODE>Integer</CODE> form.
     * @return The <CODE>Integer</CODE> representation of the value.
     */
    public Integer toInteger() {
	return new Integer((int)value) ;
    }

    /**
     * Converts the counter value to its <CODE>String</CODE> form.
     * @return The <CODE>String</CODE> representation of the value.
     */
    public String toString() {
	return String.valueOf(value) ;
    }
  
    /**
     * Converts the counter value to its <CODE>SnmpOid</CODE> form.
     * @return The OID representation of the value.
     */
    public SnmpOid toOid() {
	return new SnmpOid(value) ;
    }
  
    /**
     * Extracts the counter from an index OID and returns its
     * value converted as an <CODE>SnmpOid</CODE>.
     * @param index The index array.
     * @param start The position in the index array.
     * @return The OID representing the counter value.
     * @exception SnmpStatusException There is no counter value
     * available at the start position.
     */
    public static SnmpOid toOid(long[] index, int start) throws SnmpStatusException {
	try {
	    return new SnmpOid(index[start]) ;
	}
	catch(IndexOutOfBoundsException e) {
	    throw new SnmpStatusException(SnmpStatusException.noSuchName) ;
	}
    }

    /**
     * Scans an index OID, skips the counter value and returns the position
     * of the next value.
     * @param index The index array.
     * @param start The position in the index array.
     * @return The position of the next value.
     * @exception SnmpStatusException There is no counter value
     * available at the start position.
     */
    public static int nextOid(long[] index, int start) throws SnmpStatusException {
	if (start >= index.length) {
	    throw new SnmpStatusException(SnmpStatusException.noSuchName) ;
	}
	else {
	    return start + 1 ;
	}
    }
    
    /**
     * Appends an <CODE>SnmpOid</CODE> representing an <CODE>SnmpCounter64</CODE> to another OID.
     * @param source An OID representing an <CODE>SnmpCounter64</CODE> value.
     * @param dest Where source should be appended.
     */
    public static void appendToOid(SnmpOid source, SnmpOid dest) {
	if (source.getLength() != 1) {
	    throw new IllegalArgumentException() ;
	}
	dest.append(source) ;
    }
  
    /**
     * Performs a clone action. This provides a workaround for the
     * <CODE>SnmpValue</CODE> interface.
     * @return The SnmpValue clone.
     */
    final synchronized public SnmpValue duplicate() {
	return (SnmpValue)clone() ;
    }

    /**
     * Clones the <CODE>SnmpCounter64</CODE> object, making a copy of its data.
     * @return The object clone.
     */
    final synchronized public Object clone() {
        SnmpCounter64  newclone = null ;
        try {
	    newclone = (SnmpCounter64) super.clone() ;
	    newclone.value = value ;
        } catch (CloneNotSupportedException e) {
	    throw new InternalError() ; // vm bug.
        }
        return newclone ;
    }

    /**
     * Returns a textual description of the type object.
     * @return ASN.1 textual description.
     */
    final public String getTypeName() {
        return name ;
    }

    // VARIABLES
    //----------
    /**
     * Name of the type.
     */
    final static String name = "Counter64" ;
  
    /**
     * This is where the value is stored. This long is positive.
     * @serial
     */
    private long value = 0 ;
}
