Java Smart Card I/O

javax.smartcardio
Class ResponseAPDU

java.lang.Object
  extended by 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
ResponseAPDU(byte[] apdu)
          Constructs a ResponseAPDU from a byte array containing the complete APDU contents (conditional body and trailed).
 
Method Summary
 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 inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

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 Detail

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 as 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

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.

Java Smart Card I/O

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