Package org.nfctools.scio

Source Code of org.nfctools.scio.TerminalHandler

/**
* Copyright 2011-2012 Adrian Stabiszewski, as@nfctools.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*       http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.nfctools.scio;

import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.logging.Logger;

import javax.smartcardio.CardException;
import javax.smartcardio.CardTerminal;
import javax.smartcardio.TerminalFactory;

public class TerminalHandler {

  private Logger log = Logger.getLogger(TerminalHandler.class.getName());
  private Collection<Terminal> knownTerminals = new HashSet<Terminal>();

  public void addTerminal(Terminal terminal) {
    knownTerminals.add(terminal);
  }

  public Terminal getAvailableTerminal() {
    return getAvailableTerminal(null);
  }

  public Terminal getAvailableTerminal(String preferredTerminalName) {
    try {
      TerminalFactory terminalFactory = TerminalFactory.getDefault();
      List<CardTerminal> terminals = terminalFactory.terminals().list();
      for (CardTerminal terminal : terminals) {
        log.info("Checking terminal: " + terminal.getName());
        if (preferredTerminalName == null || preferredTerminalName.equals(terminal.getName())) {
          for (Terminal knownTerminal : knownTerminals) {
            if (knownTerminal.canHandle(terminal.getName())) {
              knownTerminal.setCardTerminal(terminal);
              return knownTerminal;
            }
          }
        }
      }
      StringBuilder sb = new StringBuilder();
      for (CardTerminal terminal : terminals) {
        sb.append(" [").append(terminal.getName()).append("]");
      }
      throw new IllegalArgumentException("No supported card terminal found. Available Terminals " + sb.toString());
    }
    catch (CardException e) {
      throw new RuntimeException(e);
    }
  }
}
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