import org.apache.tools.ant.input.MultipleChoiceInputRequest; //导入依赖的package包/类
public void handleInput(InputRequest request) throws BuildException {
  final String prompt = request.getPrompt();
  if (prompt == null) {
    throw new BuildException("Prompt is null");
  }
  final SegmentedOutputStream err = IdeaAntLogger2.ourErr;
  if (err == null) {
    throw new BuildException("Selected InputHandler should be used by Intellij IDEA");
  }
  final PacketWriter packet = PacketFactory.ourInstance.createPacket(IdeaAntLogger2.INPUT_REQUEST);
  packet.appendLimitedString(prompt);
  packet.appendLimitedString(request.getDefaultValue());
  if (request instanceof MultipleChoiceInputRequest) {
    Vector choices = ((MultipleChoiceInputRequest)request).getChoices();
    if (choices != null && choices.size() > 0) {
      int count = choices.size();
      packet.appendLong(count);
      for (int i = 0; i < count; i++) {
        packet.appendLimitedString((String)choices.elementAt(i));
      }
    }
    else {
      packet.appendLong(0);
    }
  }
  else {
    packet.appendLong(0);
  }
  packet.sendThrough(err);
  try {
    final byte[] replayLength = readBytes(4);
    final int length = ((int)replayLength[0] << 24) | ((int)replayLength[1] << 16) | ((int)replayLength[2] << 8) | replayLength[3];
    final byte[] replay = readBytes(length);
    final String input = new String(replay);
    request.setInput(input);
    if (!request.isInputValid()) {
      throw new BuildException("Invalid input: " + input);
    }
  }
  catch (IOException e) {
    throw new BuildException(e);
  }
}