/*
* Copyright (c) 1997, 2011, 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
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*/
package com.sun.jmx.snmp;
/**
* Represents an SNMP null value.
* <p><b>This API is a Sun Microsystems internal API and is subject
* to change without notice.</b></p>
*/
public class SnmpNull extends SnmpValue {
private static final long serialVersionUID = 1783782515994279177L;
// CONSTRUCTORS
//-------------
/**
* Constructs a new <CODE>SnmpNull</CODE>.
*/
public SnmpNull() {
tag = NullTag ;
}
/**
* Constructs a new <CODE>SnmpNull</CODE>.
* <BR>For mibgen private use only.
*/
public SnmpNull(String dummy) {
this();
}
/**
* Constructs a new <CODE>SnmpNull</CODE> from the specified tag value.
* @param t The initialization value.
*/
public SnmpNull(int t) {
tag = t ;
}
// PUBLIC METHODS
//---------------
/**
* Returns the tag value of this <CODE>SnmpNull</CODE>.
* @return The value.
*/
public int getTag() {
return tag ;
}
/**
* Converts the <CODE>NULL</CODE> value to its ASN.1 <CODE>String</CODE> form.
* When the tag is not the universal one, it is preprended
* to the <CODE>String</CODE> form.
* @return The <CODE>String</CODE> representation of the value.
*/
public String toString() {
String result = "" ;
if (tag != 5) {
result += "[" + tag + "] " ;
}
result += "NULL" ;
switch(tag) {
case errNoSuchObjectTag :
result += " (noSuchObject)" ;
break ;
case errNoSuchInstanceTag :
result += " (noSuchInstance)" ;
break ;
case errEndOfMibViewTag :
result += " (endOfMibView)" ;
break ;
}
return result ;
}
/**
* Converts the <CODE>NULL</CODE> value to its <CODE>SnmpOid</CODE> form.
* Normally, a <CODE>NULL</CODE> value cannot be used as an index value,
* this method triggers an exception.
* @return The OID representation of the value.
*/
public SnmpOid toOid() {
throw new IllegalArgumentException() ;
}
/**
* 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>SnmpNull</CODE> object, making a copy of its data.
* @return The object clone.
*/
final synchronized public Object clone() {
SnmpNull newclone = null ;
try {
newclone = (SnmpNull) super.clone() ;
newclone.tag = tag ;
} catch (CloneNotSupportedException e) {
throw new InternalError(e) ; // vm bug.
}
return newclone ;
}
/**
* Returns a textual description of the type object.
* @return ASN.1 textual description.
*/
final public String getTypeName() {
return name ;
}
/**
* Checks if this <CODE>SnmpNull</CODE> object corresponds to a <CODE>noSuchObject</CODE> value.
* @return <CODE>true</CODE> if the tag equals {@link com.sun.jmx.snmp.SnmpDataTypeEnums#errNoSuchObjectTag},
* <CODE>false</CODE> otherwise.
*/
public boolean isNoSuchObjectValue() {
return (tag == SnmpDataTypeEnums.errNoSuchObjectTag);
}
/**
* Checks if this <CODE>SnmpNull</CODE> object corresponds to a <CODE>noSuchInstance</CODE> value.
* @return <CODE>true</CODE> if the tag equals {@link com.sun.jmx.snmp.SnmpDataTypeEnums#errNoSuchInstanceTag},
* <CODE>false</CODE> otherwise.
*/
public boolean isNoSuchInstanceValue() {
return (tag == SnmpDataTypeEnums.errNoSuchInstanceTag);
}
/**
* Checks if this <CODE>SnmpNull</CODE> object corresponds to an <CODE>endOfMibView</CODE> value.
* @return <CODE>true</CODE> if the tag equals {@link com.sun.jmx.snmp.SnmpDataTypeEnums#errEndOfMibViewTag},
* <CODE>false</CODE> otherwise.
*/
public boolean isEndOfMibViewValue() {
return (tag == SnmpDataTypeEnums.errEndOfMibViewTag);
}
// VARIABLES
//----------
/**
* Name of the type.
*/
final static String name = "Null" ;
/**
* This is the tag of the NULL value. By default, it is the universal tag value.
*/
private int tag = 5 ;
}