validate method

@override ValidationResult<T, E> validate(T value)

Validates value and returns a ValidationResult.

Returns Valid if the value passes validation, or Invalid/InvalidAll if it fails.

Implementation

@override
ValidationResult<T, E> validate(T value) {
  // Check for cache hit
  if (_cache.containsKey(value)) {
    // Move to end (most recently used)
    _accessOrder.remove(value);
    _accessOrder.add(value);
    return _cache[value]!;
  }

  // Compute result
  final result = _inner.validate(value);

  // Evict oldest if at capacity
  if (_cache.length >= _maxSize) {
    final oldest = _accessOrder.removeAt(0);
    _cache.remove(oldest);
  }

  // Cache the result
  _cache[value] = result;
  _accessOrder.add(value);

  return result;
}