Class ATR

java.lang.Object
javax.smartcardio.ATR
All Implemented Interfaces:
Serializable

public final class ATR
extends Object
implements Serializable
A Smart Card's answer-to-reset bytes. A Card's ATR object can be obtained by calling Card.getATR(). This class does not attempt to verify that the ATR encodes a semantically valid structure.

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:
Card.getATR(), Serialized Form
  • Constructor Summary

    Constructors
    Constructor Description
    ATR​(byte[] atr)
    Constructs an ATR from a byte array.
  • Method Summary

    Modifier and Type Method Description
    boolean equals​(Object obj)
    Compares the specified object with this ATR for equality.
    byte[] getBytes()
    Returns a copy of the bytes in this ATR.
    byte[] getHistoricalBytes()
    Returns a copy of the historical bytes in this ATR.
    int hashCode()
    Returns the hash code value for this ATR.
    String toString()
    Returns a string representation of this ATR.

    Methods declared in class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait
  • Constructor Details

    • ATR

      public ATR​(byte[] atr)
      Constructs an ATR from a byte array.
      Parameters:
      atr - the byte array containing the answer-to-reset bytes
      Throws:
      NullPointerException - if atr is null
  • Method Details

    • getBytes

      public byte[] getBytes()
      Returns a copy of the bytes in this ATR.
      Returns:
      a copy of the bytes in this ATR.
    • getHistoricalBytes

      public byte[] getHistoricalBytes()
      Returns a copy of the historical bytes in this ATR. If this ATR does not contain historical bytes, an array of length zero is returned.
      Returns:
      a copy of the historical bytes in this ATR.
    • toString

      public String toString()
      Returns a string representation of this ATR.
      Overrides:
      toString in class Object
      Returns:
      a String representation of this ATR.
    • equals

      public boolean equals​(Object obj)
      Compares the specified object with this ATR for equality. Returns true if the given object is also an ATR and its bytes are identical to the bytes in this ATR.
      Overrides:
      equals in class Object
      Parameters:
      obj - the object to be compared for equality with this ATR
      Returns:
      true if the specified object is equal to this ATR
      See Also:
      Object.hashCode(), HashMap
    • hashCode

      public int hashCode()
      Returns the hash code value for this ATR.
      Overrides:
      hashCode in class Object
      Returns:
      the hash code value for this ATR.
      See Also:
      Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)