/* * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package com.sun.jmx.snmp;  import java.io.Serializable;import java.net.InetAddress;/** * Is the fully decoded representation of an SNMP packet. * <P> * Classes are derived from <CODE>SnmpPdu</CODE> to * represent the different forms of SNMP packets * ({@link com.sun.jmx.snmp.SnmpPduPacket SnmpPduPacket}, * {@link com.sun.jmx.snmp.SnmpScopedPduPacket SnmpScopedPduPacket}) * <BR>The <CODE>SnmpPdu</CODE> class defines the attributes * common to every form of SNMP packets. * * * <p><b>This API is a Sun Microsystems internal API  and is subject * to change without notice.</b></p> * @see SnmpMessage * @see SnmpPduFactory * * @since 1.5 */public abstract class SnmpPdu implements SnmpDefinitions, Serializable {     /**     * PDU type. Types are defined in     * {@link com.sun.jmx.snmp.SnmpDefinitions SnmpDefinitions}.     * @serial     */    public int type=0 ;     /**     * Protocol version. Versions are defined in     * {@link com.sun.jmx.snmp.SnmpDefinitions SnmpDefinitions}.     * @serial     */    public int version=0 ;     /**     * List of variables.     * @serial     */    public SnmpVarBind[] varBindList ;      /**     * Request identifier.     * Note that this field is not used by <CODE>SnmpPduTrap</CODE>.     * @serial     */    public int requestId=0 ;     /**     * Source or destination address.     * <P>For an incoming PDU it's the source.     * <BR>For an outgoing PDU it's the destination.     * @serial     */    public InetAddress address ;     /**     * Source or destination port.     * <P>For an incoming PDU it's the source.     * <BR>For an outgoing PDU it's the destination.     * @serial     */    public int port=0 ;     /**     * Returns the <CODE>String</CODE> representation of a PDU type.     * For instance, if the PDU type is <CODE>SnmpDefinitions.pduGetRequestPdu</CODE>,     * the method will return "SnmpGet".     * @param cmd The integer representation of the PDU type.     * @return The <CODE>String</CODE> representation of the PDU type.     */    public static String pduTypeToString(int cmd) {        switch (cmd) {        case pduGetRequestPdu :            return "SnmpGet" ;        case pduGetNextRequestPdu :            return "SnmpGetNext" ;        case pduWalkRequest :            return "SnmpWalk(*)" ;        case pduSetRequestPdu :            return "SnmpSet" ;        case pduGetResponsePdu :            return "SnmpResponse" ;        case pduV1TrapPdu :            return "SnmpV1Trap" ;        case pduV2TrapPdu :            return "SnmpV2Trap" ;        case pduGetBulkRequestPdu :            return "SnmpGetBulk" ;        case pduInformRequestPdu :            return "SnmpInform" ;        }        return "Unknown Command = " + cmd ;    }}