Newtonsoft.Json/Linq/JsonPath/QueryExpression.cs

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using System;
using System.Collections.Generic;

namespace Newtonsoft.Json.Linq.JsonPath
{
    internal enum QueryOperator
    {
        None,
        Equals,
        NotEquals,
        Exists,
        LessThan,
        LessThanOrEquals,
        GreaterThan,
        GreaterThanOrEquals,
        And,
        Or
    }

    internal abstract class QueryExpression
    {
        public QueryOperator Operator { get; set; }

        public abstract bool IsMatch(JToken t);
    }

    internal class CompositeExpression : QueryExpression
    {
        public List<QueryExpression> Expressions { get; set; }

        public CompositeExpression()
        {
            Expressions = new List<QueryExpression>();
        }

        public override bool IsMatch(JToken t)
        {
            switch (Operator)
            {
                case QueryOperator.And:
                    foreach (QueryExpression e in Expressions)
                    {
                        if (!e.IsMatch(t))
                            return false;
                    }
                    return true;
                case QueryOperator.Or:
                    foreach (QueryExpression e in Expressions)
                    {
                        if (e.IsMatch(t))
                            return true;
                    }
                    return false;
                default:
                    throw new ArgumentOutOfRangeException();
            }
        }
    }

    internal class BooleanQueryExpression : QueryExpression