/***********************************************************************
 *            Project: baifenBinfa
 *        ProjectName: 百分兵法管理系统                               
 *                Web: http://chuanyin.com                     
 *             Author:                                        
 *              Email:                               
 *         CreateTime: 202403/02   
 *        Description: 暂无
 ***********************************************************************/

using System.Collections.Generic;
using System.Linq.Expressions;

namespace CoreCms.Net.Model.Entities.Expression
{
    public class ParameterRebinder : ExpressionVisitor
    {
        private readonly Dictionary<ParameterExpression, ParameterExpression> map;

        public ParameterRebinder(Dictionary<ParameterExpression, ParameterExpression> map)
        {
            this.map = map ?? new Dictionary<ParameterExpression, ParameterExpression>();
        }

        public static System.Linq.Expressions.Expression ReplaceParameters(
            Dictionary<ParameterExpression, ParameterExpression> map, System.Linq.Expressions.Expression exp)
        {
            return new ParameterRebinder(map).Visit(exp);
        }

        protected override System.Linq.Expressions.Expression VisitParameter(ParameterExpression p)
        {
            ParameterExpression replacement;
            if (map.TryGetValue(p, out replacement)) p = replacement;
            return base.VisitParameter(p);
        }
    }
}