Package org.opennms.protocols.snmp

Class SnmpOctetString

java.lang.Object

org.opennms.protocols.snmp.SnmpOctetString

All Implemented Interfaces:

Serializable, Cloneable, SnmpSyntax

Direct Known Subclasses:

SnmpIPAddress, SnmpOpaque

public class SnmpOctetString
extends Object
implements SnmpSyntax, Cloneable, Serializable

Implements the ASN1.UNIVERSAL Octet String datatype. The string is a sequence of 8-bit octet data. The format of the 8-bit characters are defined by the application.

Author:

Brian Weaver

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static byte	ASNTYPE	The ASN.1 value for the OCTET STRING type.

Constructor Summary

Constructors

Constructor	Description
SnmpOctetString()	The default class constructor.
SnmpOctetString(byte[] data)	Constructs an octet string with the inital value equal to data.
SnmpOctetString(SnmpOctetString second)	Class copy constructor.

Method Summary

Modifier and Type	Method	Description
protected void	assumeString(byte[] data)	This can be used by a derived class to force the data contained by the octet string.
Object	clone()	Creates a duplicate copy of the object and returns it to the caller.
int	decodeASN(byte[] buf, int offset, AsnEncoder encoder)	Decodes the ASN.1 octet string from the passed buffer.
SnmpSyntax	duplicate()	Creates a duplicate copy of the object and returns it to the caller.
int	encodeASN(byte[] buf, int offset, AsnEncoder encoder)	Encodes the ASN.1 octet string using the passed encoder and stores the results in the passed buffer.
boolean	equals(Object obj)
int	getLength()	Returns the internal length of the octet string.
byte[]	getString()	Returns a reference to the internal object string.
int	hashCode()
void	setString(byte[] data)	Sets the internal string array so that it is identical to the passed array.
void	setString(String data)	Sets the internal octet string equal to the converted stirng via the method getBytes().
static String	toDisplayString(SnmpOctetString octetString)	This method takes an SnmpOctetString and replaces any unprintable characters with ASCII period ('.') and returns the resulting character string.
static String	toHexString(SnmpOctetString ostr)
String	toString()	Returns a string representation of the object.
byte	typeId()	Returns the ASN.1 type identifier for the Octet String.

Methods inherited from class java.lang.Object

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

Field Detail

ASNTYPE

public static final byte ASNTYPE

The ASN.1 value for the OCTET STRING type.

See Also:

Constant Field Values

Constructor Detail

SnmpOctetString

public SnmpOctetString()

The default class constructor. Constructs an Octet String with a length of zero and no data.

SnmpOctetString

public SnmpOctetString(byte[] data)

Constructs an octet string with the inital value equal to data. The data is actually copied so changes to the data reference do not affect the Octet string object.

Parameters:

data - The data to be copied to self

SnmpOctetString

public SnmpOctetString(SnmpOctetString second)

Class copy constructor. Constructs and octet string object that is a duplicate of the object second.

Parameters:

second - The object to copy into self

Method Detail

assumeString

protected void assumeString(byte[] data)

This can be used by a derived class to force the data contained by the octet string. The data is not duplicated, only the reference to the array is stored. No validation of data is performed at all.

Parameters:

data - The new data buffer.

getString

public byte[] getString()

Returns a reference to the internal object string. Changes to this byte array WILL affect the octet string object. These changes should not be made lightly.

Returns:

A reference to the internal byte array.

setString

public void setString(byte[] data)

Sets the internal string array so that it is identical to the passed array. The array is actually copied so that changes to data after the construction of the object are not reflected in the SnmpOctetString Object.

Parameters:

data - The new octet string data.

setString

public void setString(String data)

Sets the internal octet string equal to the converted stirng via the method getBytes(). This may cause some data corruption since the conversion is platform specific.

Parameters:

data - The new octet string data.

See Also:

String.getBytes()

getLength

public int getLength()

Returns the internal length of the octet string. This method is favored over recovereing the length from the internal array. The method compensates for a null set of data and returns zero if the internal array is null.

Returns:

The length of the octet string.

typeId

public byte typeId()

Returns the ASN.1 type identifier for the Octet String.

Specified by:

typeId in interface SnmpSyntax

Returns:

The ASN.1 identifier.

encodeASN

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

Encodes the ASN.1 octet string 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 octet string 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()

Creates a duplicate copy of the object and returns it to the caller.

Specified by:

duplicate in interface SnmpSyntax

Returns:

A newly constructed copy of self

clone

public Object clone()

Creates a duplicate copy of the object and returns it to the caller.

Overrides:

clone in class Object

Returns:

A newly constructed copy of self

toString

public String toString()

Returns a string representation of the object. If the object contains non-printable characters then the contents are printed in hexidecimal.

Overrides:

toString in class Object

toDisplayString

public static String toDisplayString(SnmpOctetString octetString)

This method takes an SnmpOctetString and replaces any unprintable characters with ASCII period ('.') and returns the resulting character string. Special case in which the supplied SnmpOctetString consists of a single ASCII Null byte is also handled. In this special case an empty string is returned. NOTE: A character is considered unprintable if its decimal value falls outside of the range: 32 - 126.

Parameters:

octetString - SnmpOctetString from which to generate the String

Returns:

a Java String object created from the octet string's byte array.

toHexString

public static String toHexString(SnmpOctetString ostr)

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object