Module java.smartcardio

Package javax.smartcardio

Class ResponseAPDU

java.lang.Object

javax.smartcardio.ResponseAPDU

All Implemented Interfaces:

Serializable

public final class ResponseAPDU
extends Object
implements Serializable

A response APDU as defined in ISO/IEC 7816-4. It consists of a conditional body and a two byte trailer. This class does not attempt to verify that the APDU encodes a semantically valid response.

Instances of this class are immutable. Where data is passed in or out via byte arrays, defensive cloning is performed.

Since:

1.6

See Also:

• CommandAPDU
• CardChannel.transmit
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ResponseAPDU(byte[] apdu)	Constructs a ResponseAPDU from a byte array containing the complete APDU contents (conditional body and trailed).

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Compares the specified object with this response APDU for equality.
byte[]	getBytes()	Returns a copy of the bytes in this APDU.
byte[]	getData()	Returns a copy of the data bytes in the response body.
int	getNr()	Returns the number of data bytes in the response body (Nr) or 0 if this APDU has no body.
int	getSW()	Returns the value of the status bytes SW1 and SW2 as a single status word SW.
int	getSW1()	Returns the value of the status byte SW1 as a value between 0 and 255.
int	getSW2()	Returns the value of the status byte SW2 as a value between 0 and 255.
int	hashCode()	Returns the hash code value for this response APDU.
String	toString()	Returns a string representation of this response APDU.

Methods declared in class java.lang.Object

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

Constructor Details

ResponseAPDU

public ResponseAPDU(byte[] apdu)

Constructs a ResponseAPDU from a byte array containing the complete APDU contents (conditional body and trailed).

Note that the byte array is cloned to protect against subsequent modification.

Parameters:

apdu - the complete response APDU

Throws:

NullPointerException - if apdu is null

IllegalArgumentException - if apdu.length is less than 2

Method Details

getNr

public int getNr()

Returns the number of data bytes in the response body (Nr) or 0 if this APDU has no body. This call is equivalent to getData().length.

Returns:

the number of data bytes in the response body or 0 if this APDU has no body.

getData

public byte[] getData()

Returns a copy of the data bytes in the response body. If this APDU has no body, this method returns a byte array with a length of zero.

Returns:

a copy of the data bytes in the response body or the empty byte array if this APDU has no body.

getSW1

public int getSW1()

Returns the value of the status byte SW1 as a value between 0 and 255.

Returns:

the value of the status byte SW1 as a value between 0 and 255.

getSW2

public int getSW2()

Returns the value of the status byte SW2 as a value between 0 and 255.

Returns:

the value of the status byte SW2 as a value between 0 and 255.

getSW

public int getSW()

Returns the value of the status bytes SW1 and SW2 as a single status word SW. It is defined as (getSW1() << 8) | getSW2()

Returns:

the value of the status word SW.

getBytes

public byte[] getBytes()

Returns a copy of the bytes in this APDU.

Returns:

a copy of the bytes in this APDU.

toString

public String toString()

Returns a string representation of this response APDU.

Overrides:

toString in class Object

Returns:

a String representation of this response APDU.

equals

public boolean equals(Object obj)

Compares the specified object with this response APDU for equality. Returns true if the given object is also a ResponseAPDU and its bytes are identical to the bytes in this ResponseAPDU.

Overrides:

equals in class Object

Parameters:

obj - the object to be compared for equality with this response APDU

Returns:

true if the specified object is equal to this response APDU

See Also:

• Object.hashCode()
• HashMap

hashCode

public int hashCode()

Returns the hash code value for this response APDU.

Overrides:

hashCode in class Object

Returns:

the hash code value for this response APDU.

See Also:

• Object.equals(java.lang.Object)
• System.identityHashCode(java.lang.Object)