javacard.framework
Class AID

java.lang.Object
  javacard.framework.AID

public final class AID

extends Object

This class encapsulates the Application Identifier(AID) associated with an applet. An AID is defined in ISO 7816-5 to be a sequence of bytes between 5 and 16 bytes in length.

The JCRE creates instances of AID class to identify and manage every applet on the card. Applets need not create instances of this class. An applet may request and use the JCRE owned instances to identify itself and other applet instances.

JCRE owned instances of AID are permanent JCRE Entry Point Objects and can be accessed from any applet context. References to these permanent objects can be stored and re-used.

An applet instance can obtain a reference to JCRE owned instances of its own AID object by using the JCSystem.getAID() method and another applet's AID object via the JCSystem.lookupAID() method.

An applet uses AID instances to request to share another applet's object or to control access to its own shared object from another applet. See Java Card Runtime Environment (JCRE) Specification, section 6.2.1 for details.

See Also:

JCSystem, SystemException

Constructor Summary

AID(byte[] bArray, short offset, byte length)
The JCRE uses this constructor to create a new AID instance encapsulating the specified AID bytes.

Method Summary

boolean	equals(byte[] bArray, short offset, byte length) Checks if the specified AID bytes in bArray are the same as those encapsulated in this AID object.
boolean	equals(Object anObject) Compares the AID bytes in this AID instance to the AID bytes in the specified object.
byte	getBytes(byte[] dest, short offset) Called to get the AID bytes encapsulated within AID object.
boolean	partialEquals(byte[] bArray, short offset, byte length) Checks if the specified partial AID byte sequence matches the first length bytes of the encapsulated AID bytes within this AID object.
boolean	RIDEquals(AID otherAID) Checks if the RID (National Registered Application provider identifier) portion of the encapsulated AID bytes within the otherAID object matches that of this AID object.

Constructor Detail

AID

public AID(byte[] bArray,
           short offset,
           byte length)
    throws SystemException

The JCRE uses this constructor to create a new AID instance encapsulating the specified AID bytes.

Parameters:

bArray - the byte array containing the AID bytes.

offset - the start of AID bytes in bArray.

length - the length of the AID bytes in bArray.

Throws:

SystemException - with the following reason code:

• SystemException.ILLEGAL_VALUE if the length parameter is less than 5 or greater than 16.

Method Detail

getBytes

public byte getBytes(byte[] dest,
                     short offset)

Called to get the AID bytes encapsulated within AID object.

Parameters:

dest - byte array to copy the AID bytes.

offset - within dest where the AID bytes begin.

Returns:

the length of the AID bytes.

equals

public boolean equals(Object anObject)

Compares the AID bytes in this AID instance to the AID bytes in the specified object. The result is true if and only if the argument is not null and is an AID object that encapsulates the same AID bytes as this object.

This method does not throw NullPointerException.

Overrides:

equals in class Object

Parameters:

anObject - the object to compare this AID against.

Returns:

true if the AID byte values are equal, false otherwise.

equals

public boolean equals(byte[] bArray,
                      short offset,
                      byte length)

Checks if the specified AID bytes in bArray are the same as those encapsulated in this AID object. The result is true if and only if the bArray argument is not null and the AID bytes encapsulated in this AID object are equal to the specified AID bytes in bArray.

This method does not throw NullPointerException.

Parameters:

bArray - containing the AID bytes

offset - within bArray to begin

length - of AID bytes in bArray

Returns:

true if equal, false otherwise.

partialEquals

public boolean partialEquals(byte[] bArray,
                             short offset,
                             byte length)

Checks if the specified partial AID byte sequence matches the first length bytes of the encapsulated AID bytes within this AID object. The result is true if and only if the bArray argument is not null and the input length is less than or equal to the length of the encapsulated AID bytes within this AID object and the specified bytes match.

This method does not throw NullPointerException.

Parameters:

bArray - containing the partial AID byte sequence

offset - within bArray to begin

length - of partial AID bytes in bArray

Returns:

true if equal, false otherwise.

RIDEquals

public boolean RIDEquals(AID otherAID)

Checks if the RID (National Registered Application provider identifier) portion of the encapsulated AID bytes within the otherAID object matches that of this AID object. The first 5 bytes of an AID byte sequence is the RID. See ISO 7816-5 for details. The result is true if and only if the argument is not null and is an AID object that encapsulates the same RID bytes as this object.

This method does not throw NullPointerException.

Parameters:

otherAID - the AID to compare against.

Returns:

true if the RID bytes match, false otherwise.