using System;
using Deltares.Dam.Data;

namespace Deltares.Standard.Specifications
{
    public class PredicateSpecification<T> : CompositeSpecification<T>
    {
        private readonly Predicate<T> predicate;

        public PredicateSpecification(Predicate<T> predicate)
        {
            if (predicate == default(Predicate<T>))
                throw new ArgumentNullException("predicate");

            this.predicate = predicate;
        }

        #region ISpecification<T> Members

        /// <summary>
        /// Determines whether the candidate satisfies the specification.
        /// </summary>
        /// <param name="candidate">The candidate.</param>
        /// <returns>
        ///   <c>true</c> if the candidate satisfies the specification otherwise, <c>false</c>.
        /// </returns>
        public override bool IsSatisfiedBy(T candidate)
        {
            return this.predicate(candidate);
        }

        #endregion
    }
}