com.novell.ldap.asn1
Class ASN1Identifier

java.lang.Object
  com.novell.ldap.asn1.ASN1Identifier

All Implemented Interfaces:

java.lang.Cloneable, java.io.Serializable

public class ASN1Identifier

extends java.lang.Object

implements java.lang.Cloneable, java.io.Serializable

This class is used to encapsulate an ASN.1 Identifier.

An ASN1Identifier is composed of three parts:

a class type,

a form, and

a tag.

The class type is defined as:

 bit 8 7 TAG CLASS
 ------- -----------
     0 0 UNIVERSAL
     0 1 APPLICATION
     1 0 CONTEXT
     1 1 PRIVATE

The form is defined as:

 bit 6 FORM
 ----- --------
     0 PRIMITIVE
     1 CONSTRUCTED

Note: CONSTRUCTED types are made up of other CONSTRUCTED or PRIMITIVE types.

The tag is defined as:

 bit 5 4 3 2 1 TAG
 ------------- ---------------------------------------------
     0 0 0 0 0
     . . . . .
     1 1 1 1 0 (0-30) single octet tag

     1 1 1 1 1 (> 30) multiple octet tag, more octets follow

See Also:

Serialized Form

Field Summary

static int	APPLICATION Application-wide tag class.
static int	CONTEXT Context-specific tag class.
static int	PRIVATE Private-use tag class.
static int	UNIVERSAL Universal tag class.

Constructor Summary

ASN1Identifier()

ASN1Identifier(java.io.InputStream in)
Decode an ASN1Identifier directly from an InputStream and save the encoded length of the ASN1Identifier.

ASN1Identifier(int tagClass, boolean constructed, int tag)
Constructs an ASN1Identifier using the classtype, form and tag.

Method Summary

java.lang.Object	clone() Creates a duplicate, not a true clone, of this object and returns a reference to the duplicate.
int	getASN1Class() Returns the CLASS of this ASN1Identifier as an int value.
boolean	getConstructed() Return a boolean indicating if the constructed bit is set.
int	getEncodedLength() Returns the encoded length of this ASN1Identifier.
int	getTag() Returns the TAG of this ASN1Identifier.
boolean	isApplication() Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of APPLICATION.
boolean	isContext() Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of CONTEXT-SPECIFIC.
boolean	isPrivate() Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of PRIVATE.
boolean	isUniversal() Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of UNIVERSAL.
void	reset(java.io.InputStream in) Decode an ASN1Identifier directly from an InputStream and save the encoded length of the ASN1Identifier, but reuse the object.

Methods inherited from class java.lang.Object

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

Field Detail

UNIVERSAL

public static final int UNIVERSAL

Universal tag class.

UNIVERSAL = 0

See Also:

Constant Field Values

APPLICATION

public static final int APPLICATION

Application-wide tag class.

APPLICATION = 1

See Also:

Constant Field Values

CONTEXT

public static final int CONTEXT

Context-specific tag class.

CONTEXT = 2

See Also:

Constant Field Values

PRIVATE

public static final int PRIVATE

Private-use tag class.

PRIVATE = 3

See Also:

Constant Field Values

Constructor Detail

ASN1Identifier

public ASN1Identifier(int tagClass,
                      boolean constructed,
                      int tag)

Constructs an ASN1Identifier using the classtype, form and tag.

Parameters:

tagClass - As defined above.

constructed - Set to true if constructed and false if primitive.

tag - The tag of this identifier

ASN1Identifier

public ASN1Identifier(java.io.InputStream in)
               throws java.io.IOException

Decode an ASN1Identifier directly from an InputStream and save the encoded length of the ASN1Identifier.

Parameters:

in - The input stream to decode from.

ASN1Identifier

public ASN1Identifier()

Method Detail

reset

public final void reset(java.io.InputStream in)
                 throws java.io.IOException

Decode an ASN1Identifier directly from an InputStream and save the encoded length of the ASN1Identifier, but reuse the object.

Parameters:

in - The input stream to decode from.

Throws:

java.io.IOException

getASN1Class

public final int getASN1Class()

Returns the CLASS of this ASN1Identifier as an int value.

See Also:

UNIVERSAL, APPLICATION, CONTEXT, PRIVATE

getConstructed

public final boolean getConstructed()

Return a boolean indicating if the constructed bit is set.

Returns:

true if constructed and false if primitive.

getTag

public final int getTag()

Returns the TAG of this ASN1Identifier.

getEncodedLength

public final int getEncodedLength()

Returns the encoded length of this ASN1Identifier.

isUniversal

public final boolean isUniversal()

Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of UNIVERSAL.

See Also:

UNIVERSAL

isApplication

public final boolean isApplication()

Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of APPLICATION.

See Also:

APPLICATION

isContext

public final boolean isContext()

Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of CONTEXT-SPECIFIC.

See Also:

CONTEXT

isPrivate

public final boolean isPrivate()

Returns a boolean value indicating whether or not this ASN1Identifier has a TAG CLASS of PRIVATE.

See Also:

PRIVATE

clone

public java.lang.Object clone()

Creates a duplicate, not a true clone, of this object and returns a reference to the duplicate.