How to use

asIterable

method

in

js.util.Types

/**
 * Retrieve content array like instance as iterable. Delegates {@link #getValue(Object, String)} to obtain the requested
 * value. If value is null warn the event and return empty list. I value is array like return it as iterable, otherwise
 * throws content exception.
 * 
 * @param scope scope object,
 * @param propertyPath object property path.
 * @return array like instance, possible empty, converted to iterable.
 * @throws TemplateException if requested value is undefined or is not an {@link Types#isArrayLike(Object) an array like}.
 */
Iterable<?> getIterable(Object scope, String propertyPath) throws TemplateException {
  Object value = getValue(scope, propertyPath);
  if (value == null) {
    warn(scope.getClass(), propertyPath);
    return Collections.EMPTY_LIST;
  }
  if (!Types.isArrayLike(value)) {
    throw new TemplateException("Invalid type. Expected list but got |%s|.", value.getClass());
  }
  return Types.asIterable(value);
}

/**
 * Serialize opening square brace, array items separated by comma and closing square brace. This method invoked recursively
 * {@link #serialize(Object)} for every array item.
 * 
 * @param value
 * @throws IOException
 */
private void serializeArray(Object value) throws IOException {
  write('[');
  int index = 0;
  for (Object item : Types.asIterable(value)) {
    if (index++ > 0) {
      write(',');
    }
    serialize(item);
  }
  write(']');
}