[SNMP4J] Newbie... typesafe enumerations

[Beton, Richard]

Here's that SnmpVersion.java:


package org.snmp4j;

/**
 * This typesafe enumeration provides the version numbering for different SNMP
 * variants.
 * 
 * @author Rick Beton
 */
public final class SnmpVersion
{
    // note that the numeric version numbers are NOT arbitrary:
    // they must correspond to the values used in SNMP

    /** Supported versions of SNMP. */
    public static final SnmpVersion SNMP_V1  = new SnmpVersion( 0 );
    public static final SnmpVersion SNMP_V2c = new SnmpVersion( 1 );
    public static final SnmpVersion SNMP_V3  = new SnmpVersion( 3 );

    private static final SnmpVersion[] ALL = new SnmpVersion[]
    { SNMP_V1, SNMP_V2c, SNMP_V3 };                                                         


    /**
     * Gets the SnmpVersion instance indicated by the corresponding integer.
     * @param snmpVersion the version number, as used in the SNMP message header
     * @return the SnmpVersion instance, or null if not found.
     */
    public static SnmpVersion lookup (int snmpVersion)
    {
        for (int i = 0; i < ALL.length; i++)
        {
            if (ALL[i].version == snmpVersion)
            {
                return ALL[i];
            }
        }
        return null;
    }


    private final int version;


    /**
     * Typesafe private constructor.
     */
    private SnmpVersion (int version)
    {
        this.version = version;
    }


    /**
     * Gets the numeric version indicator.
     * 
     * @return Returns the version.
     */
    public int getVersion ()
    {
        return version;
    }
}




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