codec.asn1
Class ASN1NOP

java.lang.Object
  |
  +--codec.asn1.ASN1NOP

All Implemented Interfaces:

ASN1Type

public final class ASN1NOP

extends Object

implements ASN1Type

The ASN1NOP class helps to keep ASN1Types at fixed positions in the internal list. The class realize the Null Object - Pattern . If an optional ASN1Type is not present the ASN1NOP should used to fill its place. So all other ASN1Types in this ASN1Sequence remains at the same position. This class will be ignored while encoding. Other methods than getInstance() or isOptional() will throw an UnsupportedOperationException.

Author:

Frank Lautenschläger Created on 23.07.2004

Method Summary

void	checkConstraints() DOCUMENT ME!
void	decode(Decoder dec) DOCUMENT ME!
void	encode(Encoder enc) The encode method returns without writing anything to the encoder.
Constraint	getConstraint() ASN1NOP has no constraints
static ASN1NOP	getInstance() Returns the singleton
int	getTag() DOCUMENT ME!
int	getTagClass() (non-Javadoc)
Object	getValue() DOCUMENT ME!
boolean	isExplicit() (non-Javadoc)
boolean	isOptional() The ASN1NOP always has the semantic of optional is true.
boolean	isType(int tag, int tagclass) DOCUMENT ME!
void	setConstraint(Constraint o) ASN1NOP needs no constraints
void	setExplicit(boolean explicit) (non-Javadoc)
void	setOptional(boolean optional) The ASN1NOP always has the semantic of optional is true.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getInstance

public static ASN1NOP getInstance()

Returns the singleton

Returns:

ASN1NOP - singleton instance

getValue

public Object getValue()

DOCUMENT ME!

Specified by:

getValue in interface ASN1Type

Returns:

null

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.getValue()

setOptional

public void setOptional(boolean optional)

The ASN1NOP always has the semantic of optional is true.

Specified by:

setOptional in interface ASN1Type

Parameters:

optional - DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.setOptional(boolean)

isOptional

public boolean isOptional()

The ASN1NOP always has the semantic of optional is true.

Specified by:

isOptional in interface ASN1Type

See Also:

ASN1Type.isOptional()

getTag

public int getTag()

DOCUMENT ME!

Specified by:

getTag in interface ASN1Type

Returns:

DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.getTag()

getTagClass

public int getTagClass()

(non-Javadoc)

Specified by:

getTagClass in interface ASN1Type

Returns:

DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.getTagClass()

setExplicit

public void setExplicit(boolean explicit)

(non-Javadoc)

Specified by:

setExplicit in interface ASN1Type

Parameters:

explicit - DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.setExplicit(boolean)

isExplicit

public boolean isExplicit()

(non-Javadoc)

Specified by:

isExplicit in interface ASN1Type

Returns:

DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.isExplicit()

isType

public boolean isType(int tag,
                      int tagclass)

DOCUMENT ME!

Specified by:

isType in interface ASN1Type

Parameters:

tag - DOCUMENT ME!

tagclass - DOCUMENT ME!

Returns:

DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.isType(int, int)

encode

public void encode(Encoder enc)

The encode method returns without writing anything to the encoder.

Specified by:

encode in interface ASN1Type

Parameters:

enc - DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.encode(codec.asn1.Encoder)

decode

public void decode(Decoder dec)

DOCUMENT ME!

Specified by:

decode in interface ASN1Type

Parameters:

dec - DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.decode(codec.asn1.Decoder)

setConstraint

public void setConstraint(Constraint o)

ASN1NOP needs no constraints

Specified by:

setConstraint in interface ASN1Type

Parameters:

o - DOCUMENT ME!

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.setConstraint(codec.asn1.Constraint)

getConstraint

public Constraint getConstraint()

ASN1NOP has no constraints

Specified by:

getConstraint in interface ASN1Type

See Also:

ASN1Type.getConstraint()

checkConstraints

public void checkConstraints()

DOCUMENT ME!

Specified by:

checkConstraints in interface ASN1Type

Throws:

UnsupportedOperationException -

See Also:

ASN1Type.checkConstraints()