How to use

isSubmitType

method

in

org.jivesoftware.smackx.xdata.Form

/**
 * Sets a new Object value to a given form's field. In fact, the object representation
 * (i.e. #toString) will be the actual value of the field.<p>
 *
 * If the value to set to the field is not a basic type (e.g. String, boolean, int, etc.) you
 * will need to use {@link #setAnswer(String, String)} where the String value is the
 * String representation of the object.<p>
 *
 * Before setting the new value to the field we will check if the form is of type submit. If
 * the form isn't of type submit means that it's not possible to complete the form and an
 * exception will be thrown.
 *
 * @param field the form field that was completed.
 * @param value the Object value that was answered. The object representation will be the
 * actual value.
 * @throws IllegalStateException if the form is not of type "submit".
 */
private void setAnswer(FormField field, Object value) {
  if (!isSubmitType()) {
    throw new IllegalStateException("Cannot set an answer if the form is not of type " +
    "\"submit\"");
  }
  field.resetValues();
  field.addValue(value.toString());
}

/**
 * Sets the default value as the value of a given form's field. The field whose variable matches
 * the requested variable will be completed with its default value. If no field could be found
 * for the specified variable then an exception will be raised.
 *
 * @param variable the variable to complete with its default value.
 * @throws IllegalStateException if the form is not of type "submit".
 * @throws IllegalArgumentException if the form does not include the specified variable.
 */
public void setDefaultAnswer(String variable) {
  if (!isSubmitType()) {
    throw new IllegalStateException("Cannot set an answer if the form is not of type " +
    "\"submit\"");
  }
  FormField field = getField(variable);
  if (field != null) {
    // Clear the old values
    field.resetValues();
    // Set the default value
    for (CharSequence value : field.getValues()) {
      field.addValue(value);
    }
  }
  else {
    throw new IllegalArgumentException("Couldn't find a field for the specified variable.");
  }
}

if (!isSubmitType()) {
  throw new IllegalStateException("Cannot set an answer if the form is not of type " +
  "\"submit\"");

/**
 * Returns a DataForm that serves to send this Form to the server. If the form is of type
 * submit, it may contain fields with no value. These fields will be removed since they only
 * exist to assist the user while editing/completing the form in a UI.
 *
 * @return the wrapped DataForm.
 */
public DataForm getDataFormToSend() {
  if (isSubmitType()) {
    // Create a new DataForm that contains only the answered fields
    DataForm dataFormToSend = new DataForm(getType());
    for (FormField field : getFields()) {
      if (!field.getValues().isEmpty()) {
        dataFormToSend.addField(field);
      }
    }
    return dataFormToSend;
  }
  return dataForm;
}