org.mozilla.jss.asn1

Class Tag

java.lang.Object

org.mozilla.jss.asn1.Tag

public class Tag
extends java.lang.Object

Represents an ASN.1 Tag. A tag consists of a class and a number.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Tag.Class An enumeration of the ASN.1 tag classes.

Field Summary

Fields

Modifier and Type	Field and Description
static Tag.Class	APPLICATION A tag class.
static Tag.Class	CONTEXT_SPECIFIC A tag class.
static Tag	END_OF_CONTENTS The end-of-contents marker for indefinite length encoding.
static Tag	EOC An alias for END_OF_CONTENTS.
static Tag.Class	PRIVATE A tag class.
static Tag.Class	UNIVERSAL A tag class.

Constructor Summary

Constructors

Constructor and Description
Tag(long num) Creates a CONTEXT-SPECIFIC tag with the given tag number.
Tag(Tag.Class clazz, long num) Creates a tag with the given class and number.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj) Compares two tags for equality.
static Tag	get(long num) Returns an instance of a context-specific tag with the given number.
long	getNum()
Tag.Class	getTagClass()
int	hashCode()
java.lang.String	toString() Returns a String representation of the tag.

Methods inherited from class java.lang.Object

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

Field Detail

UNIVERSAL

public static final Tag.Class UNIVERSAL

A tag class.

APPLICATION

public static final Tag.Class APPLICATION

A tag class.

CONTEXT_SPECIFIC

public static final Tag.Class CONTEXT_SPECIFIC

A tag class.

PRIVATE

public static final Tag.Class PRIVATE

A tag class.

END_OF_CONTENTS

public static final Tag END_OF_CONTENTS

The end-of-contents marker for indefinite length encoding. It is encoded the same as an ASN.1 header whose tag is [UNIVERSAL 0].

EOC

public static final Tag EOC

An alias for END_OF_CONTENTS.

Constructor Detail

Tag

public Tag(Tag.Class clazz,
           long num)

Creates a tag with the given class and number.

Parameters:

clazz - The class of the tag.

num - The tag number.

Tag

public Tag(long num)

Creates a CONTEXT-SPECIFIC tag with the given tag number.

Parameters:

num - The tag number.

Method Detail

getNum

public long getNum()

Returns:

The tag number.

getTagClass

public Tag.Class getTagClass()

Returns:

The tag class.

get

public static Tag get(long num)

Returns an instance of a context-specific tag with the given number. The returned instance may be singleton. It is usually more efficient to call this method than create your own context-specific tag.

Parameters:

num - Number.

Returns:

Tag.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Compares two tags for equality. Tags are equal if they have the same class and tag number.

Overrides:

equals in class java.lang.Object

Parameters:

obj - Tag.

Returns:

True if equal.

toString

public java.lang.String toString()

Returns a String representation of the tag. For example, a tag whose class was UNIVERSAL and whose number was 16 would return "UNIVERSAL 16".

Overrides:

toString in class java.lang.Object