//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidKernel/DateTimeValidator.h"
#include "MantidKernel/DateAndTime.h"

namespace Mantid {
namespace Kernel {

/**
 * @return A clone of the current state of the validator
 */
IValidator_sptr DateTimeValidator::clone() const {
  return boost::make_shared<DateTimeValidator>(*this);
}

DateTimeValidator::DateTimeValidator() { m_allowedEmpty = false; }

/**
 * Sets the value of the m_allowEmpty variable
 * @param allow The new value of m_allowEmpty
 */
void DateTimeValidator::allowEmpty(const bool &allow) {
  m_allowedEmpty = allow;
}

/**
 *  @param value A string to check for an ISO formatted timestamp
 *  @return An empty string if the value is valid or an string containing
 *          a description of the error otherwise
 */
std::string DateTimeValidator::checkValidity(const std::string &value) const {
  // simply pass off the work DateAndTime constructor
  // the DateAndTime::stringIsISO8601 does not seem strict enough, it accepts
  // empty strings & strings of letters!
  if (m_allowedEmpty && value.empty()) {
    return "";
  } else {
    std::string error("");
    try {
      DateAndTime timestamp(value);
      UNUSED_ARG(timestamp);
    } catch (std::invalid_argument &exc) {
      error = exc.what();
    }
    return error;
  }
}
}
}