org.opennms.protocols.snmp

Class SnmpObjectId

java.lang.Object

org.opennms.protocols.snmp.SnmpObjectId

All Implemented Interfaces:

Serializable, Cloneable, SnmpSyntax

public class SnmpObjectId
extends Object
implements SnmpSyntax, Cloneable, Serializable

Defines the SNMP object identifier class for naming variables. An object identifier is a sequence of numbers that correspond to branches in the Management Information Base (MIB). Each vendor is free to define their own branch of the tree. The SnmpObjectId class provides an interface for naming those tree instances.

Author:

Brian Weaver , Nazario Irizarry, Jr.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static byte	ASNTYPE Defines the SNMP SMI type for this particular object.

Constructor Summary

Constructors

Constructor and Description
SnmpObjectId() Creates a default empty object identifier.
SnmpObjectId(int[] data) Creates an object identifier from the passed array of identifiers.
SnmpObjectId(SnmpObjectId second) Creates a duplicate object.
SnmpObjectId(String strOid) Creates an object identifier from the pased dotted decimal object identifier string.

Method Summary

Methods

Modifier and Type	Method and Description
void	append(int[] ids) Appends the specified identifiers to the current object.
void	append(SnmpObjectId second) Appends the passed SnmpObjectId object to self.
void	append(String strOids) Converts the passed string to an object identifier and appends them to the current object.
Object	clone() Implements the cloneable interface.
int	compare(int[] ids) Lexigraphically compares the object identifer to the array of identifiers.
int	compare(int[] ids, int dist) Lexigraphically compares the object identifer to the array of identifiers.
int	compare(SnmpObjectId cmp) Lexigraphically compares the object identifer to the passed object identifer.
int	decodeASN(byte[] buf, int offset, AsnEncoder encoder) Decodes the ASN.1 object identifer from the passed buffer.
SnmpSyntax	duplicate() Serves the same purpose as the method clone().
int	encodeASN(byte[] buf, int offset, AsnEncoder encoder) Encodes the ASN.1 object identifier using the passed encoder and stores the results in the passed buffer.
boolean	equals(Object o) Test for equality.
int[]	getIdentifiers() Gets the array of object identifiers from the object.
int	getLastIdentifier() Returns the value of the last object identifier component value
int	getLength() Gets the number of object identifiers in the object.
int	hashCode() Returns a computed hash code value for the object identifier.
boolean	isRootOf(SnmpObjectId leaf) Compares the passed object identifier against self to determine if self is the root of the passed object.
void	prepend(int[] ids) Prepends the passed set of identifiers to the front of the object.
void	prepend(SnmpObjectId second) Prepends the passed SnmpObjectId object to self.
void	prepend(String strOids) Converts the passed string to an object identifier and prepends them to the current object.
void	setIdentifiers(int[] data) Sets the object to the passed object identifier
void	setIdentifiers(String strOid) Sets the object to the passed dotted decimal object identifier string.
String	toString() Converts the object identifier to a dotted decimal string representation.
byte	typeId() Used to get the ASN.1 type for this particular object.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ASNTYPE

public static final byte ASNTYPE

Defines the SNMP SMI type for this particular object.

See Also:

Constant Field Values

Constructor Detail

SnmpObjectId

public SnmpObjectId()

Creates a default empty object identifier.

SnmpObjectId

public SnmpObjectId(int[] data)

Creates an object identifier from the passed array of identifiers. If the passed argument is null then a default object id (.0.0) is created for the instance.

Parameters:

data - The array of object identifiers

SnmpObjectId

public SnmpObjectId(SnmpObjectId second)

Creates a duplicate object. The passed object identifier is copied into the newly created object.

Parameters:

second - The object to copy

SnmpObjectId

public SnmpObjectId(String strOid)

Creates an object identifier from the pased dotted decimal object identifier string. The string is converted to the internal representation. If the conversion fails then a default (.0.0) object identifier is assigned to the object.

Parameters:

strOid - The dotted decimal object identifier string

Method Detail

getLength

public int getLength()

Gets the number of object identifiers in the object.

Returns:

Returns the number of object identifiers

getLastIdentifier

public int getLastIdentifier()

Returns the value of the last object identifier component value

getIdentifiers

public int[] getIdentifiers()

Gets the array of object identifiers from the object. The instance is returned as a reference. The caller should not make any modifications to the returned list.

Returns:

Returns the list of identifiers

setIdentifiers

public void setIdentifiers(int[] data)

Sets the object to the passed object identifier

Parameters:

data - The new object identifier

setIdentifiers

public void setIdentifiers(String strOid)

Sets the object to the passed dotted decimal object identifier string.

Parameters:

strOid - The dotted decimal object identifier.

append

public void append(int[] ids)

Appends the specified identifiers to the current object.

Parameters:

ids - The array of identifiers to append

append

public void append(String strOids)

Converts the passed string to an object identifier and appends them to the current object.

Parameters:

strOids - The dotted decimal identifiers to append

append

public void append(SnmpObjectId second)

Appends the passed SnmpObjectId object to self.

Parameters:

second - The object to append to self

prepend

public void prepend(int[] ids)

Prepends the passed set of identifiers to the front of the object.

Parameters:

ids - The list of identifiers

prepend

public void prepend(String strOids)

Converts the passed string to an object identifier and prepends them to the current object.

Parameters:

strOids - The dotted decimal identifiers to prepend

prepend

public void prepend(SnmpObjectId second)

Prepends the passed SnmpObjectId object to self.

Parameters:

second - The object to prepend to self

compare

public int compare(int[] ids)

Lexigraphically compares the object identifer to the array of identifiers. If the object is lexigraphically less than ids a negative number is returned. A positive number is returned if self is greater than the passed identifers and a zero is returned if they are equal. The length of the identifiers do not have to be equal.

Parameters:

ids - The array if identifier to compare

Returns:

Returns zero if the ids are equal. Less than zero if the object is less than 'ids' and greater than zero if the object is greater than 'ids'.

compare

public int compare(int[] ids,
          int dist)

Lexigraphically compares the object identifer to the array of identifiers. If the object is lexigraphically less than ids a negative number is returned. A positive number is returned if self is greater than the passed identifers and a zero is returned if they are equal. The length of the identifiers do not have to be equal.

Parameters:

ids - The array if identifier to compare.

dist - The maximum number of ids to compare.

Returns:

Returns zero if the ids are equal. Less than zero if the object is less than 'ids' and greater than zero if the object is greater than 'ids'.

compare

public int compare(SnmpObjectId cmp)

Lexigraphically compares the object identifer to the passed object identifer. If the object is lexigraphically less than 'cmp' a negative number is returned. A positive number is returned if self is greater than the passed identifer and a zero is returned if they are equal. The length of the identifiers do not have to be equal.

Parameters:

cmp - The object identifier to compare

Returns:

Returns zero if the ids are equal. Less than zero if the object is less than 'cmp' and greater than zero if the object is greater than 'cmp'.

isRootOf

public boolean isRootOf(SnmpObjectId leaf)

Compares the passed object identifier against self to determine if self is the root of the passed object. If the passed object is in the same root tree as self then a true value is returned. Otherwise a false value is returned from the object.

Parameters:

leaf - The object to be tested

Returns:

True if leaf is in the tree.

equals

public boolean equals(Object o)

Test for equality. Returns true if 'o' is an instance of an SnmpObjectId and is equal to self.

Overrides:

equals in class Object

Parameters:

o - The object to be tested for equality.

Returns:

True if the object is an SnmpObjectId and is equal to self. False otherwise.

toString

public String toString()

Converts the object identifier to a dotted decimal string representation.

Overrides:

toString in class Object

Returns:

Returns the dotted decimal object id string.

hashCode

public int hashCode()

Returns a computed hash code value for the object identifier. If the value of the object identifier is changed through any method the hash value for the identifer will change. Care must be exercised by developers to ensure that ObjectIds do not change when inserted into managers that track object by their hash value.

Overrides:

hashCode in class Object

Returns:

The hash code for the object.

Since:

1.8

typeId

public byte typeId()

Used to get the ASN.1 type for this particular object.

Specified by:

typeId in interface SnmpSyntax

encodeASN

public int encodeASN(byte[] buf,
            int offset,
            AsnEncoder encoder)
              throws AsnEncodingException

Encodes the ASN.1 object identifier using the passed encoder and stores the results in the passed buffer. An exception is thrown if an error occurs with the encoding of the information.

Specified by:

encodeASN in interface SnmpSyntax

Parameters:

buf - The buffer to write the encoded information.

offset - The offset to start writing information

encoder - The encoder object.

Returns:

The offset of the byte immediantly after the last encoded byte.

Throws:

AsnEncodingException - Thrown if the encoder finds an error in the buffer.

decodeASN

public int decodeASN(byte[] buf,
            int offset,
            AsnEncoder encoder)
              throws AsnDecodingException

Decodes the ASN.1 object identifer from the passed buffer. If an error occurs during the decoding sequence then an AsnDecodingException is thrown by the method. The value is decoded using the AsnEncoder passed to the object.

Specified by:

decodeASN in interface SnmpSyntax

Parameters:

buf - The encode buffer

offset - The offset byte to begin decoding

encoder - The decoder object.

Returns:

The index of the byte immediantly after the last decoded byte of information.

Throws:

AsnDecodingException - Thrown by the encoder if an error occurs trying to decode the data buffer.

duplicate

public SnmpSyntax duplicate()

Serves the same purpose as the method clone().

Specified by:

duplicate in interface SnmpSyntax

Returns:

A new copy of self.

clone

public Object clone()

Implements the cloneable interface.

Overrides:

clone in class Object

Returns:

Returns a new SnmpObjectId copy of self.