using System.Linq.Expressions;

namespace CMS.Plugin.HIAWms.Domain.Samples
{
    /// <summary>
    /// Sample规约
    /// </summary>
    public class SampleSpecification : Volo.Abp.Specifications.Specification<Sample>
    {
        private readonly string _name;

        /// <summary>
        /// Initializes a new instance of the <see cref="SampleSpecification"/> class.
        /// </summary>
        public SampleSpecification()
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="SampleSpecification"/> class.
        /// </summary>
        /// <param name="name">The name.</param>
        public SampleSpecification(string name = null)
        {
            _name = name;
        }

        /// <inheritdoc />
        public override Expression<Func<Sample, bool>> ToExpression()
        {
            Expression<Func<Sample, bool>> expression = c => 1 == 1;

            if (_name != null)
            {
                expression = expression.And(c => c.Name == _name);
            }

            return expression;
        }
    }
}