iaik.asn1
Class SET

java.lang.Object
  |
  +--iaik.asn1.ASN1Object
        |
        +--iaik.asn1.ConstructedType
              |
              +--iaik.asn1.SET

All Implemented Interfaces:

Cloneable

public class SET

extends ConstructedType

This class implements the ASN.1 native type "SET". SET is a structered ASN.1 type identified by the UNIVERSAL TAG number 17. An ASN.1 SET object is composed of several unordered components. All the components may have the same type or may have different types.

A SET object is DER encoded using the constructed encoding practice by splitting it into separately encoded components. Therefore the SEQUENCE class is extended to be a subclass of the ConstructedType class. Each component can be added to the current SET object by using a proper addComponent method of the ConstructedType super class.

The constructed form can be recognized by bit 6 of the (first) identifier octet(s) of the DER encoded bit stream, which is set to 1.

The following example creates a new SET object and adds an INTERGER, BOOLEAN, and a PrintableString component:

 SET set = new SET();
 set.addComponent(new INTEGER(3));
 set.addComponent(new BOOLEAN(true));
 set.addComponent(new PrintableString("Test"));
 

Of course, sets may be nested meaning that one SET contains another SET as one of its components. The nesting may be of any depth.

Version:

File Revision 19

See Also:

ASN1Object, ASN, ConstructedType, ConstructedType.addComponent(iaik.asn1.ASN1Object)

Field Summary

protected boolean

sorted

Fields inherited from class iaik.asn1.ConstructedType

content_count, content_data

Fields inherited from class iaik.asn1.ASN1Object

asnType, constructed, encode_listener, indefinite_length, isStringType, stream_mode

Constructor Summary

SET()
Creates a new SET.

SET(boolean sorted)
Creates a new SET.

Method Summary

protected void	encode(OutputStream os) DER encodes this ASN1Object and writes the result to the supplied OutputStream.
String	toString() Returns a String that represents the value of this SET.

Methods inherited from class iaik.asn1.ConstructedType

addComponent, addComponent, addEncodeListener, clone, countComponents, decode, getComponentAt, getComponents, getValue, removeComponent, removeComponent, setComponent, setValue

Methods inherited from class iaik.asn1.ASN1Object

addEncodeListener, encodeObject, getAsnType, indefiniteLength, isA, isConstructed, isStringType, setIndefiniteLength

Methods inherited from class java.lang.Object

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

Field Detail

sorted

protected boolean sorted

Constructor Detail

SET

public SET()

Creates a new SET.

Components may be added by means of the addComponent method of the ConstructedType super class.

SET

public SET(boolean sorted)

Creates a new SET. If the parameter sorted is set to true the components are sorted by their encodings. This constructor only shall be used for creating SET OF structures where all components have the same type. In this way, an application may prefer to call the createSetOf(ASN1Type[] array, boolean sorted) method of class ASN for creating the SET OF.

Parameters:

sorted - whether to sort the components by their encodings or not

Method Detail

toString

public String toString()

Returns a String that represents the value of this SET.

Overrides:

toString in class ASN1Object

Returns:

the String representation

See Also:

ASN1Object.toString()

encode

protected void encode(OutputStream os)
               throws IOException

Description copied from class: ConstructedType

DER encodes this ASN1Object and writes the result to the supplied OutputStream. In stream mode the components are encoded in correct order and the indefinite length encoding method is used, in normal mode the components are encoded in reverse order to facilitate length determination. Indefinite length encoding may be preferable when dealing with large objects where whole the data is not known at beginning of the data transfer.

Overrides:

encode in class ConstructedType

Following copied from class: iaik.asn1.ConstructedType

Parameters:

os - the output stream to which to write the data

Throws:

IOException - if an error occurs while reading from the stream