com.lowagie.bc.asn1

Class ASN1TaggedObject

Implemented Interfaces:
DEREncodable, DERTags
Known Direct Subclasses:
DERTaggedObject

public abstract class ASN1TaggedObject
extends DERObject

ASN.1 TaggedObject - in ASN.1 nottation this is any object proceeded by a [n] where n is some number - these are assume to follow the construction rules (as with sequences).

Field Summary

(package private) boolean
empty
(package private) boolean
explicit
(package private) DEREncodable
obj
(package private) int
tagNo

Fields inherited from interface com.lowagie.bc.asn1.DERTags

APPLICATION, BIT_STRING, BMP_STRING, BOOLEAN, CONSTRUCTED, ENUMERATED, EXTERNAL, GENERALIZED_TIME, GENERAL_STRING, GRAPHIC_STRING, IA5_STRING, INTEGER, NULL, NUMERIC_STRING, OBJECT_IDENTIFIER, OCTET_STRING, PRINTABLE_STRING, SEQUENCE, SEQUENCE_OF, SET, SET_OF, T61_STRING, TAGGED, UNIVERSAL_STRING, UTC_TIME, UTF8_STRING, VIDEOTEX_STRING, VISIBLE_STRING

Constructor Summary

ASN1TaggedObject(boolean explicit, int tagNo, DEREncodable obj)
ASN1TaggedObject(int tagNo, DEREncodable obj)

Method Summary

(package private) abstract void
encode(DEROutputStream out)
boolean
equals(Object o)
static ASN1TaggedObject
getInstance(ASN1TaggedObject obj, boolean explicit)
DERObject
getObject()
return whatever was following the tag.
int
getTagNo()
int
hashCode()
boolean
isEmpty()
boolean
isExplicit()
return whether or not the object may be explicitly tagged.

Methods inherited from class com.lowagie.bc.asn1.DERObject

encode, getDERObject

Field Details

empty

(package private)  boolean empty

explicit

(package private)  boolean explicit

obj

(package private)  DEREncodable obj

tagNo

(package private)  int tagNo

Constructor Details

ASN1TaggedObject

public ASN1TaggedObject(boolean explicit,
                        int tagNo,
                        DEREncodable obj)
Parameters:
explicit - true if the object is explicitly tagged.
tagNo - the tag number for this object.
obj - the tagged object.

ASN1TaggedObject

public ASN1TaggedObject(int tagNo,
                        DEREncodable obj)
Parameters:
tagNo - the tag number for this object.
obj - the tagged object.

Method Details

encode

(package private)  abstract void encode(DEROutputStream out)
            throws IOException
Overrides:
encode in interface DERObject

equals

public boolean equals(Object o)

getInstance

public static ASN1TaggedObject getInstance(ASN1TaggedObject obj,
                                           boolean explicit)

getObject

public DERObject getObject()
return whatever was following the tag.

Note: tagged objects are generally context dependent if you're trying to extract a tagged object you should be going via the appropriate getInstance method.


getTagNo

public int getTagNo()

hashCode

public int hashCode()

isEmpty

public boolean isEmpty()

isExplicit

public boolean isExplicit()
return whether or not the object may be explicitly tagged.

Note: if the object has been read from an input stream, the only time you can be sure if isExplicit is returning the true state of affairs is if it returns false. An implicitly tagged object may appear to be explicitly tagged, so you need to understand the context under which the reading was done as well, see getObject below.