172 lines
5.7 KiB
C#
172 lines
5.7 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using Swan.Reflection;
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namespace Swan.Validators {
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/// <summary>
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/// Represents an object validator.
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/// </summary>
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/// <example>
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/// The following code describes how to perform a simple object validation.
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/// <code>
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/// using Swan.Validators;
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///
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/// class Example
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/// {
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/// public static void Main()
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/// {
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/// // create an instance of ObjectValidator
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/// var obj = new ObjectValidator();
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///
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/// // Add a validation to the 'Simple' class with a custom error message
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/// obj.AddValidator<Simple>(x =>
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/// !string.IsNullOrEmpty(x.Name), "Name must not be empty");
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///
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/// // check if object is valid
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/// var res = obj.IsValid(new Simple { Name = "Name" });
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/// }
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///
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/// class Simple
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/// {
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/// public string Name { get; set; }
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/// }
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/// }
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/// </code>
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///
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/// The following code shows of to validate an object with a custom validator and some attributes using the Runtime ObjectValidator singleton.
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/// <code>
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/// using Swan.Validators;
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///
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/// class Example
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/// {
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/// public static void Main()
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/// {
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/// // create an instance of ObjectValidator
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/// Runtime.ObjectValidator
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/// .AddValidator<Simple>(x =>
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/// !x.Name.Equals("Name"), "Name must not be 'Name'");
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///
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/// // validate object
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/// var res = Runtime.ObjectValidator
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/// .Validate(new Simple{ Name = "name", Number = 5, Email ="email@mail.com"})
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/// }
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///
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/// class Simple
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/// {
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/// [NotNull]
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/// public string Name { get; set; }
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///
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/// [Range(1, 10)]
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/// public int Number { get; set; }
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///
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/// [Email]
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/// public string Email { get; set; }
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/// }
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/// }
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/// </code>
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/// </example>
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public class ObjectValidator {
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private static readonly Lazy<ObjectValidator> LazyInstance = new Lazy<ObjectValidator>(() => new ObjectValidator());
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private readonly ConcurrentDictionary<Type, List<Tuple<Delegate, String>>> _predicates = new ConcurrentDictionary<Type, List<Tuple<Delegate, String>>>();
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/// <summary>
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/// Gets the current.
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/// </summary>
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/// <value>
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/// The current.
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/// </value>
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public static ObjectValidator Current => LazyInstance.Value;
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/// <summary>
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/// Validates an object given the specified validators and attributes.
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/// </summary>
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/// <typeparam name="T">The type of the object.</typeparam>
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/// <param name="target">The object.</param>
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/// <returns cref="ObjectValidationResult">A validation result. </returns>
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public ObjectValidationResult Validate<T>(T target) {
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ObjectValidationResult errorList = new ObjectValidationResult();
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_ = this.ValidateObject(target, false, errorList.Add);
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return errorList;
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}
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/// <summary>
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/// Validates an object given the specified validators and attributes.
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/// </summary>
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/// <typeparam name="T">The type.</typeparam>
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/// <param name="target">The object.</param>
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/// <returns>
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/// <c>true</c> if the specified object is valid; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">obj.</exception>
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public Boolean IsValid<T>(T target) => this.ValidateObject(target);
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/// <summary>
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/// Adds a validator to a specific class.
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/// </summary>
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/// <typeparam name="T">The type of the object.</typeparam>
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/// <param name="predicate">The predicate that will be evaluated.</param>
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/// <param name="message">The message.</param>
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/// <exception cref="ArgumentNullException">
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/// predicate
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/// or
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/// message.
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/// </exception>
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public void AddValidator<T>(Predicate<T> predicate, String message) where T : class {
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if(predicate == null) {
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throw new ArgumentNullException(nameof(predicate));
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}
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if(String.IsNullOrEmpty(message)) {
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throw new ArgumentNullException(message);
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}
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if(!this._predicates.TryGetValue(typeof(T), out List<Tuple<Delegate, String>> existing)) {
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existing = new List<Tuple<Delegate, String>>();
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this._predicates[typeof(T)] = existing;
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}
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existing.Add(Tuple.Create((Delegate)predicate, message));
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}
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private Boolean ValidateObject<T>(T obj, Boolean returnOnError = true, Action<String, String> action = null) {
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if(Equals(obj, null)) {
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throw new ArgumentNullException(nameof(obj));
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}
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if(this._predicates.ContainsKey(typeof(T))) {
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foreach((Delegate @delegate, String value) in this._predicates[typeof(T)]) {
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if((Boolean)@delegate.DynamicInvoke(obj)) {
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continue;
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}
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action?.Invoke(String.Empty, value);
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if(returnOnError) {
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return false;
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}
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}
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}
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Dictionary<System.Reflection.PropertyInfo, IEnumerable<Object>> properties = AttributeCache.DefaultCache.Value.RetrieveFromType<T, IValidator>();
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foreach(KeyValuePair<System.Reflection.PropertyInfo, IEnumerable<Object>> prop in properties) {
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foreach(Object attribute in prop.Value) {
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IValidator val = (IValidator)attribute;
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if(val.IsValid(prop.Key.GetValue(obj, null))) {
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continue;
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}
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action?.Invoke(prop.Key.Name, val.ErrorMessage);
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if(returnOnError) {
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return false;
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}
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}
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}
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return true;
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}
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}
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} |