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## opencard.core.service
Class CardHolderVerificationGUI

    java.lang.Object
      |
      +--opencard.core.service.CardHolderVerificationGUI

public final class CardHolderVerificationGUI
extends java.lang.Object

The system user interaction handler.

This class provides a trusted path to the OpenCard Framework.

Constructor Summary
`protected` | `CardHolderVerificationGUI()`

Method Summary
`protected void` | `clearDisplay()` Clear the display.
`protected void` | `display(int num)` Display a message.
`protected java.lang.String` | `keyboardInput(CardTerminalIOControl ioControl, CHVDialog customCHVDialog)` Return keyboard (i.e., keyboard, PIN pad, etc.) input.
`protected java.lang.String` | `promptUser(int chvNumber, CardTerminalIOControl ioControl, CHVDialog customCHVDialog)` Prompt the user for a password, etc.
`ResponseAPDU` | `sendVerifiedAPDU(SlotChannel slotchan, CommandAPDU command, CHVControl control, CHVDialog dialog)` Queries for a PIN and sends it to the smartcard.
`ResponseAPDU` | `sendVerifiedAPDU(SlotChannel slotchan, CommandAPDU command, CHVControl control, CHVDialog dialog, int timeout)` Deprecated.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CardHolderVerificationGUI

    protected CardHolderVerificationGUI()

Method Detail

### clearDisplay

    protected void clearDisplay()

  Clear the display.

### display

    protected void display(int num)

  Display a message.

  Parameters:
    `message` - The `String` to display.

### keyboardInput

    protected java.lang.String keyboardInput(CardTerminalIOControl ioControl,
                                             CHVDialog customCHVDialog)

  Return keyboard (i.e., keyboard, PIN pad, etc.) input.

  Parameters:
    `ioControl` - A `CardTerminalIOControl` object that specifies how the user input should look like.
  Returns:
    A `String` containing the input.

### promptUser

    protected java.lang.String promptUser(int chvNumber,
                                          CardTerminalIOControl ioControl,
                                          CHVDialog customCHVDialog)

  Prompt the user for a password, etc.

  Parameters:
    `prompt` - The message to be displayed.
    `ioControl` - A `CardTerminalIOControl` object that specifies how the user input should look like.
  Returns:
    A `String` containing the input.

### sendVerifiedAPDU

    public ResponseAPDU sendVerifiedAPDU(SlotChannel slotchan,
                                         CommandAPDU command,
                                         CHVControl control,
                                         CHVDialog dialog,
                                         int timeout)
                                  throws CardTerminalException,
                                         CardServiceInvalidCredentialException

  Deprecated.

### sendVerifiedAPDU

    public ResponseAPDU sendVerifiedAPDU(SlotChannel slotchan,
                                         CommandAPDU command,
                                         CHVControl control,
                                         CHVDialog dialog)
                                  throws CardTerminalException,
                                         CardServiceInvalidCredentialException

  Queries for a PIN and sends it to the smartcard. This method expects a command including a PIN to send to the smartcard. The PIN or password within the command is pre-initialized with padding bytes. This method queries the password from the user, stores it in the command, and sends the resulting command to the smartcard. The smartcard's response is returned.
  This method is invoked by `CardChannel.sendVerifiedAPDU` only if the card terminal does not take responsibility for querying and filling in the password. If the terminal implements the interface `VerifiedAPDUInterface`, the channel will use the card terminal to do the job.
  Parameters:
    `slotchan` - the physical channel to the smartcard
    `command` - the APDU to send, password still missing
    `control` - the parameters needed to query and fill in the password, for example the message for querying, and an offset in the command APDU
    `dialog` - a dialog provided by the application, or `null` to use a default dialog
  Throws:
    CardTerminalException - An error occurred while sending the command.
    CardServiceInvalidCredentialException - The user entered an empty password, or cancelled the password input. No command has been sent to the smartcard.
  See Also:
    `CardChannel.sendVerifiedAPDU(opencard.core.terminal.CommandAPDU, opencard.core.terminal.CHVControl, opencard.core.service.CHVDialog, int)`

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