Added min and max length validators

Author: jamesmcroft

src/MADE.Data.Validation/Strings/Resources.Designer.cs

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <root>
   <!-- 
     Microsoft ResX Schema 
@@ -132,16 +132,22 @@
   <data name="IpAddressValidator_FeedbackMessage" xml:space="preserve">
     <value>The value must be a valid IP address, e.g. 192.168.0.1.</value>
   </data>
+  <data name="MaxLengthValidator_FeedbackMessage" xml:space="preserve">
+    <value>The length must be less than {0}.</value>
+  </data>
   <data name="MaxValueValidator_FeedbackMessage" xml:space="preserve">
     <value>The value must be less than {0}.</value>
   </data>
+  <data name="MinLengthValidator_FeedbackMessage" xml:space="preserve">
+    <value>The length must be greater than {0}.</value>
+  </data>
   <data name="MinValueValidator_FeedbackMessage" xml:space="preserve">
     <value>The value must be greater than {0}.</value>
   </data>
   <data name="RegexValidator_FeedbackMessage" xml:space="preserve">
     <value>The value does not match the valid mask.</value>
   </data>
   <data name="RequiredValidator_FeedbackMessage" xml:space="preserve">
-    <value>Please fill out this field.</value>
+    <value>A value is required.</value>
   </data>
 </root>

src/MADE.Data.Validation/Strings/Resources.resx

@@ -0,0 +1,78 @@
+namespace MADE.Data.Validation.Validators
+{
+    using System;
+    using System.Collections;
+    using MADE.Data.Validation;
+    using MADE.Data.Validation.Extensions;
+    using MADE.Data.Validation.Strings;
+
+    /// <summary>
+    /// Defines a data validator for ensuring a value is less than a maximum length.
+    /// </summary>
+    public class MaxLengthValidator : IValidator
+    {
+        private string feedbackMessage;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MaxLengthValidator"/> class.
+        /// </summary>
+        public MaxLengthValidator()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MaxLengthValidator"/> class with a maximum value.
+        /// </summary>
+        /// <param name="max">The maximum value.</param>
+        public MaxLengthValidator(IComparable max)
+        {
+            this.Max = max;
+        }
+
+        /// <summary>
+        /// Gets or sets the key associated with the validator.
+        /// </summary>
+        public string Key { get; set; } = nameof(MaxLengthValidator);
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the data provided is in an invalid state.
+        /// </summary>
+        public bool IsInvalid { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the data is dirty.
+        /// </summary>
+        public bool IsDirty { get; set; }
+
+        /// <summary>
+        /// Gets or sets the feedback message to display when <see cref="IValidator.IsInvalid"/> is true.
+        /// </summary>
+        public string FeedbackMessage
+        {
+            get => this.feedbackMessage.IsNullOrWhiteSpace() ? string.Format(Resources.MaxLengthValidator_FeedbackMessage, this.Max) : this.feedbackMessage;
+            set => this.feedbackMessage = value;
+        }
+
+        /// <summary>
+        /// Gets or sets the maximum value.
+        /// </summary>
+        public IComparable Max { get; set; }
+
+        /// <summary>
+        /// Executes data validation on the provided <paramref name="value"/>.
+        /// </summary>
+        /// <param name="value">The value to be validated.</param>
+        public void Validate(object value)
+        {
+            bool isInvalid = value switch
+            {
+                string str => str.Length.IsGreaterThan(this.Max),
+                ICollection col => col.Count.IsGreaterThan(this.Max),
+                _ => true
+            };
+
+            this.IsInvalid = isInvalid;
+            this.IsDirty = true;
+        }
+    }
+}

src/MADE.Data.Validation/Validators/MaxLengthValidator.cs

@@ -0,0 +1,78 @@
+namespace MADE.Data.Validation.Validators
+{
+    using System;
+    using System.Collections;
+    using MADE.Data.Validation;
+    using MADE.Data.Validation.Extensions;
+    using MADE.Data.Validation.Strings;
+
+    /// <summary>
+    /// Defines a data validator for ensuring a value is greater than a minimum length.
+    /// </summary>
+    public class MinLengthValidator : IValidator
+    {
+        private string feedbackMessage;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MinLengthValidator"/> class.
+        /// </summary>
+        public MinLengthValidator()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MinLengthValidator"/> class with a minimum value.
+        /// </summary>
+        /// <param name="min">The maximum value.</param>
+        public MinLengthValidator(IComparable min)
+        {
+            this.Min = min;
+        }
+
+        /// <summary>
+        /// Gets or sets the key associated with the validator.
+        /// </summary>
+        public string Key { get; set; } = nameof(MinLengthValidator);
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the data provided is in an invalid state.
+        /// </summary>
+        public bool IsInvalid { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the data is dirty.
+        /// </summary>
+        public bool IsDirty { get; set; }
+
+        /// <summary>
+        /// Gets or sets the feedback message to display when <see cref="IValidator.IsInvalid"/> is true.
+        /// </summary>
+        public string FeedbackMessage
+        {
+            get => this.feedbackMessage.IsNullOrWhiteSpace() ? string.Format(Resources.MinLengthValidator_FeedbackMessage, this.Min) : this.feedbackMessage;
+            set => this.feedbackMessage = value;
+        }
+
+        /// <summary>
+        /// Gets or sets the minimum value.
+        /// </summary>
+        public IComparable Min { get; set; }
+
+        /// <summary>
+        /// Executes data validation on the provided <paramref name="value"/>.
+        /// </summary>
+        /// <param name="value">The value to be validated.</param>
+        public void Validate(object value)
+        {
+            bool isInvalid = value switch
+            {
+                string str => str.Length.IsLessThan(this.Min),
+                ICollection col => col.Count.IsLessThan(this.Min),
+                _ => true
+            };
+
+            this.IsInvalid = isInvalid;
+            this.IsDirty = true;
+        }
+    }
+}