org.bouncycastle.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

Fields inherited from class org.bouncycastle.asn1.ASN1Encodable

BER, DER

Fields inherited from interface org.bouncycastle.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)
Create a tagged object with the style given by the value of explicit.
ASN1TaggedObject(int tagNo, DEREncodable obj)
Create a tagged object in the explicit style.

Method Summary

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 org.bouncycastle.asn1.DERObject

equals, hashCode, toASN1Object

Methods inherited from class org.bouncycastle.asn1.ASN1Encodable

equals, getDEREncoded, getDERObject, getEncoded, getEncoded, hashCode, toASN1Object

Constructor Details

ASN1TaggedObject

public ASN1TaggedObject(boolean explicit,
                        int tagNo,
                        DEREncodable obj)
Create a tagged object with the style given by the value of explicit.

If the object implements ASN1Choice the tag style will always be changed to explicit in accordance with the ASN.1 encoding rules.

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)
Create a tagged object in the explicit style.
Parameters:
tagNo - the tag number for this object.
obj - the tagged object.

Method Details

equals

public boolean equals(Object o)
Overrides:
equals in interface DERObject

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()
Overrides:
hashCode in interface DERObject

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.