org.spongycastle.asn1

Class ASN1TaggedObject

java.lang.Object

org.spongycastle.asn1.ASN1Object

org.spongycastle.asn1.ASN1Primitive

org.spongycastle.asn1.ASN1TaggedObject

All Implemented Interfaces:

ASN1Encodable, ASN1TaggedObjectParser, InMemoryRepresentable, Encodable

Direct Known Subclasses:

BERTaggedObject, DERTaggedObject, DLTaggedObject

public abstract class ASN1TaggedObject
extends ASN1Primitive
implements ASN1TaggedObjectParser

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

Constructor Summary

Constructors

Constructor and Description
ASN1TaggedObject(boolean explicit, int tagNo, ASN1Encodable obj) Create a tagged object with the style given by the value of explicit.

Method Summary

Modifier and Type	Method and Description
static ASN1TaggedObject	getInstance(ASN1TaggedObject obj, boolean explicit)
static ASN1TaggedObject	getInstance(java.lang.Object obj)
ASN1Primitive	getLoadedObject() Get the in-memory representation of the ASN.1 object.
ASN1Primitive	getObject() Return whatever was following the tag.
ASN1Encodable	getObjectParser(int tag, boolean isExplicit) Return the object held in this tagged object as a parser assuming it has the type of the passed in tag.
int	getTagNo() Return the tag number associated with this object.
int	hashCode()
boolean	isEmpty()
boolean	isExplicit() return whether or not the object may be explicitly tagged.
java.lang.String	toString()

Methods inherited from class org.spongycastle.asn1.ASN1Primitive

equals, fromByteArray, toASN1Primitive

Methods inherited from class org.spongycastle.asn1.ASN1Object

getEncoded, getEncoded, hasEncodedTagValue, toASN1Object

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.spongycastle.asn1.ASN1Encodable

toASN1Primitive

Constructor Detail

ASN1TaggedObject

public ASN1TaggedObject(boolean explicit,
                        int tagNo,
                        ASN1Encodable 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.

Method Detail

getInstance

public static ASN1TaggedObject getInstance(ASN1TaggedObject obj,
                                           boolean explicit)

getInstance

public static ASN1TaggedObject getInstance(java.lang.Object obj)

hashCode

public int hashCode()

Specified by:

hashCode in class ASN1Primitive

getTagNo

public int getTagNo()

Return the tag number associated with this object.

Specified by:

getTagNo in interface ASN1TaggedObjectParser

Returns:

the tag number.

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.

isEmpty

public boolean isEmpty()

getObject

public ASN1Primitive 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.

getObjectParser

public ASN1Encodable getObjectParser(int tag,
                                     boolean isExplicit)
                              throws java.io.IOException

Return the object held in this tagged object as a parser assuming it has the type of the passed in tag. If the object doesn't have a parser associated with it, the base object is returned.

Specified by:

getObjectParser in interface ASN1TaggedObjectParser

Parameters:

tag - the primitive tag value for the object tagged originally.

isExplicit - true if the tagging was done explicitly.

Returns:

a parser for the tagged object.

Throws:

java.io.IOException - if a parser cannot be constructed.

getLoadedObject

public ASN1Primitive getLoadedObject()

Description copied from interface: InMemoryRepresentable

Get the in-memory representation of the ASN.1 object.

Specified by:

getLoadedObject in interface InMemoryRepresentable

Returns:

an ASN1Primitive representing the loaded object.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object