LengthValidator.cs

#region License
// Copyright (c) Jeremy Skinner (http://www.jeremyskinner.co.uk)
// 
// Licensed under the Apache License, Version 2.0 (the "License"); 
// you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at 
// 
// http://www.apache.org/licenses/LICENSE-2.0 
// 
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, 
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
// See the License for the specific language governing permissions and 
// limitations under the License.
// 
// The latest version of this file can be found at http://www.codeplex.com/FluentValidation
#endregion

namespace ServiceStack.FluentValidation.Validators
{
    using System;
    using System.Linq.Expressions;
    using Attributes;
    using Resources;

    public class LengthValidator : PropertyValidator, ILengthValidator {
        public int Min { get; private set; }
        public int Max { get; private set; }

        public LengthValidator(int min, int max) : this(min, max, () => Messages.length_error) {
        }

        public LengthValidator(int min, int max, Expression<Func<string>> errorMessageResourceSelector) : base(errorMessageResourceSelector, ValidationErrors.Length) {
            Max = max;
            Min = min;

            if (max < min) {
                throw new ArgumentOutOfRangeException("max", "Max should be larger than min.");
            }

        }

        protected override bool IsValid(PropertyValidatorContext context) {
            int length = context.PropertyValue == null ? 0 : context.PropertyValue.ToString().Length;

            if (length < Min || length > Max) {
                context.MessageFormatter
                    .AppendArgument("MinLength", Min)
                    .AppendArgument("MaxLength", Max)
                    .AppendArgument("TotalLength", length);

                return false;
            }

            return true;
        }
    }

    public class ExactLengthValidator : LengthValidator {
        public ExactLengthValidator(int length) : base(length,length, () => Messages.exact_length_error) {
            
        }
    }

    public interface ILengthValidator : IPropertyValidator {
        int Min { get; }
        int Max { get; }
    }
}