447 lines
17 KiB
C#
447 lines
17 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Collections;
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using System.Linq;
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using System.Reflection;
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using System.Collections.Generic;
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using Unosquare.Swan.Attributes;
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namespace Unosquare.Swan {
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/// <summary>
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/// Provides various extension methods for Reflection and Types.
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/// </summary>
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public static class ReflectionExtensions {
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private static readonly Lazy<ConcurrentDictionary<Tuple<Boolean, PropertyInfo>, Func<Object, Object>>> CacheGetMethods =
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new Lazy<ConcurrentDictionary<Tuple<Boolean, PropertyInfo>, Func<Object, Object>>>(() => new ConcurrentDictionary<Tuple<Boolean, PropertyInfo>, Func<Object, Object>>(), true);
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private static readonly Lazy<ConcurrentDictionary<Tuple<Boolean, PropertyInfo>, Action<Object, Object[]>>> CacheSetMethods =
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new Lazy<ConcurrentDictionary<Tuple<Boolean, PropertyInfo>, Action<Object, Object[]>>>(() => new ConcurrentDictionary<Tuple<Boolean, PropertyInfo>, Action<Object, Object[]>>(), true);
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#region Assembly Extensions
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/// <summary>
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/// Gets all types within an assembly in a safe manner.
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/// </summary>
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/// <param name="assembly">The assembly.</param>
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/// <returns>
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/// Array of Type objects representing the types specified by an assembly.
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/// </returns>
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/// <exception cref="ArgumentNullException">assembly.</exception>
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public static IEnumerable<Type> GetAllTypes(this Assembly assembly) {
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if(assembly == null) {
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throw new ArgumentNullException(nameof(assembly));
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}
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try {
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return assembly.GetTypes();
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} catch(ReflectionTypeLoadException e) {
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return e.Types.Where(t => t != null);
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}
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}
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#endregion
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#region Type Extensions
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/// <summary>
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/// The closest programmatic equivalent of default(T).
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// Default value of this type.
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/// </returns>
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/// <exception cref="ArgumentNullException">type.</exception>
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public static Object GetDefault(this Type type) {
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if(type == null) {
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throw new ArgumentNullException(nameof(type));
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}
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return type.IsValueType() ? Activator.CreateInstance(type) : null;
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}
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/// <summary>
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/// Determines whether this type is compatible with ICollection.
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/// </summary>
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/// <param name="sourceType">The type.</param>
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/// <returns>
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/// <c>true</c> if the specified source type is collection; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">sourceType.</exception>
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public static Boolean IsCollection(this Type sourceType) {
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if(sourceType == null) {
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throw new ArgumentNullException(nameof(sourceType));
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}
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return sourceType != typeof(String) &&
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typeof(IEnumerable).IsAssignableFrom(sourceType);
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}
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/// <summary>
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/// Gets a method from a type given the method name, binding flags, generic types and parameter types.
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/// </summary>
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/// <param name="type">Type of the source.</param>
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/// <param name="bindingFlags">The binding flags.</param>
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/// <param name="methodName">Name of the method.</param>
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/// <param name="genericTypes">The generic types.</param>
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/// <param name="parameterTypes">The parameter types.</param>
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/// <returns>
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/// An object that represents the method with the specified name.
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/// </returns>
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/// <exception cref="System.Reflection.AmbiguousMatchException">
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/// The exception that is thrown when binding to a member results in more than one member matching the
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/// binding criteria. This class cannot be inherited.
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/// </exception>
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public static MethodInfo GetMethod(
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this Type type,
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BindingFlags bindingFlags,
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String methodName,
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Type[] genericTypes,
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Type[] parameterTypes) {
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if(type == null) {
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throw new ArgumentNullException(nameof(type));
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}
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if(methodName == null) {
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throw new ArgumentNullException(nameof(methodName));
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}
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if(genericTypes == null) {
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throw new ArgumentNullException(nameof(genericTypes));
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}
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if(parameterTypes == null) {
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throw new ArgumentNullException(nameof(parameterTypes));
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}
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List<MethodInfo> methods = type
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.GetMethods(bindingFlags)
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.Where(mi => String.Equals(methodName, mi.Name, StringComparison.Ordinal))
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.Where(mi => mi.ContainsGenericParameters)
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.Where(mi => mi.GetGenericArguments().Length == genericTypes.Length)
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.Where(mi => mi.GetParameters().Length == parameterTypes.Length)
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.Select(mi => mi.MakeGenericMethod(genericTypes))
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.Where(mi => mi.GetParameters().Select(pi => pi.ParameterType).SequenceEqual(parameterTypes))
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.ToList();
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return methods.Count > 1 ? throw new AmbiguousMatchException() : methods.FirstOrDefault();
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}
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/// <summary>
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/// Determines whether this instance is class.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if the specified type is class; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsClass(this Type type) => type.GetTypeInfo().IsClass;
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/// <summary>
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/// Determines whether this instance is abstract.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if the specified type is abstract; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsAbstract(this Type type) => type.GetTypeInfo().IsAbstract;
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/// <summary>
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/// Determines whether this instance is interface.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if the specified type is interface; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsInterface(this Type type) => type.GetTypeInfo().IsInterface;
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/// <summary>
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/// Determines whether this instance is primitive.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if the specified type is primitive; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsPrimitive(this Type type) => type.GetTypeInfo().IsPrimitive;
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/// <summary>
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/// Determines whether [is value type].
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if [is value type] [the specified type]; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsValueType(this Type type) => type.GetTypeInfo().IsValueType;
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/// <summary>
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/// Determines whether [is generic type].
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if [is generic type] [the specified type]; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsGenericType(this Type type) => type.GetTypeInfo().IsGenericType;
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/// <summary>
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/// Determines whether [is generic parameter].
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if [is generic parameter] [the specified type]; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsGenericParameter(this Type type) => type.IsGenericParameter;
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/// <summary>
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/// Determines whether the specified attribute type is defined.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="attributeType">Type of the attribute.</param>
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/// <param name="inherit">if set to <c>true</c> [inherit].</param>
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/// <returns>
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/// <c>true</c> if the specified attribute type is defined; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsDefined(this Type type, Type attributeType, Boolean inherit) =>
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type.GetTypeInfo().IsDefined(attributeType, inherit);
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/// <summary>
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/// Gets the custom attributes.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="attributeType">Type of the attribute.</param>
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/// <param name="inherit">if set to <c>true</c> [inherit].</param>
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/// <returns>
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/// Attributes associated with the property represented by this PropertyInfo object.
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/// </returns>
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public static Attribute[] GetCustomAttributes(this Type type, Type attributeType, Boolean inherit) =>
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type.GetTypeInfo().GetCustomAttributes(attributeType, inherit).Cast<Attribute>().ToArray();
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/// <summary>
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/// Determines whether [is generic type definition].
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if [is generic type definition] [the specified type]; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean IsGenericTypeDefinition(this Type type) => type.GetTypeInfo().IsGenericTypeDefinition;
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/// <summary>
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/// Bases the type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>returns a type of data.</returns>
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public static Type BaseType(this Type type) => type.GetTypeInfo().BaseType;
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/// <summary>
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/// Assemblies the specified type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>returns an Assembly object.</returns>
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public static Assembly Assembly(this Type type) => type.GetTypeInfo().Assembly;
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/// <summary>
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/// Determines whether [is i enumerable request].
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// <c>true</c> if [is i enumerable request] [the specified type]; otherwise, <c>false</c>.
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/// </returns>
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/// <exception cref="ArgumentNullException">type.</exception>
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public static Boolean IsIEnumerable(this Type type)
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=> type == null
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? throw new ArgumentNullException(nameof(type))
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: type.IsGenericType() && type.GetGenericTypeDefinition() == typeof(IEnumerable<>);
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#endregion
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/// <summary>
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/// Tries to parse using the basic types.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="value">The value.</param>
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/// <param name="result">The result.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean TryParseBasicType(this Type type, Object value, out Object result)
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=> TryParseBasicType(type, value.ToStringInvariant(), out result);
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/// <summary>
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/// Tries to parse using the basic types.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="value">The value.</param>
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/// <param name="result">The result.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean TryParseBasicType(this Type type, String value, out Object result) {
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result = null;
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return Definitions.BasicTypesInfo.ContainsKey(type) && Definitions.BasicTypesInfo[type].TryParse(value, out result);
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}
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/// <summary>
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/// Tries the type of the set basic value to a property.
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/// </summary>
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/// <param name="property">The property.</param>
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/// <param name="value">The value.</param>
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/// <param name="obj">The object.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean TrySetBasicType(this PropertyInfo property, Object value, Object obj) {
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try {
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if(property.PropertyType.TryParseBasicType(value, out Object propertyValue)) {
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property.SetValue(obj, propertyValue);
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return true;
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}
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} catch {
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// swallow
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}
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return false;
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}
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/// <summary>
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/// Tries the type of the set to an array a basic type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="value">The value.</param>
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/// <param name="array">The array.</param>
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/// <param name="index">The index.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean TrySetArrayBasicType(this Type type, Object value, Array array, Int32 index) {
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try {
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if(value == null) {
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array.SetValue(null, index);
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return true;
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}
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if(type.TryParseBasicType(value, out Object propertyValue)) {
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array.SetValue(propertyValue, index);
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return true;
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}
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if(type.GetTypeInfo().IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>)) {
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array.SetValue(null, index);
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return true;
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}
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} catch {
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// swallow
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}
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return false;
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}
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/// <summary>
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/// Tries to set a property array with another array.
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/// </summary>
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/// <param name="propertyInfo">The property.</param>
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/// <param name="value">The value.</param>
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/// <param name="obj">The object.</param>
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/// <returns>
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/// <c>true</c> if parsing was successful; otherwise, <c>false</c>.
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/// </returns>
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public static Boolean TrySetArray(this PropertyInfo propertyInfo, IEnumerable<Object> value, Object obj) {
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Type elementType = propertyInfo.PropertyType.GetElementType();
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if(elementType == null) {
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return false;
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}
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Array targetArray = Array.CreateInstance(elementType, value.Count());
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Int32 i = 0;
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foreach(Object sourceElement in value) {
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Boolean result = elementType.TrySetArrayBasicType(sourceElement, targetArray, i++);
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if(!result) {
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return false;
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}
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}
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propertyInfo.SetValue(obj, targetArray);
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return true;
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}
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/// <summary>
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/// Gets property actual value or <c>PropertyDisplayAttribute.DefaultValue</c> if presented.
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///
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/// If the <c>PropertyDisplayAttribute.Format</c> value is presented, the property value
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/// will be formatted accordingly.
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///
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/// If the object contains a null value, a empty string will be returned.
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/// </summary>
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/// <param name="propertyInfo">The property information.</param>
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/// <param name="obj">The object.</param>
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/// <returns>The property value or null.</returns>
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public static String ToFormattedString(this PropertyInfo propertyInfo, Object obj) {
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try {
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Object value = propertyInfo.GetValue(obj);
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PropertyDisplayAttribute attr = Runtime.AttributeCache.RetrieveOne<PropertyDisplayAttribute>(propertyInfo);
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if(attr == null) {
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return value?.ToString() ?? String.Empty;
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}
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Object valueToFormat = value ?? attr.DefaultValue;
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return String.IsNullOrEmpty(attr.Format)
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? (valueToFormat?.ToString() ?? String.Empty)
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: ConvertObjectAndFormat(propertyInfo.PropertyType, valueToFormat, attr.Format);
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} catch {
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return null;
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}
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}
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/// <summary>
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/// Gets a MethodInfo from a Property Get method.
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/// </summary>
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/// <param name="propertyInfo">The property information.</param>
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/// <param name="nonPublic">if set to <c>true</c> [non public].</param>
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/// <returns>
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/// The cached MethodInfo.
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/// </returns>
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public static Func<Object, Object> GetCacheGetMethod(this PropertyInfo propertyInfo, Boolean nonPublic = false) {
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Tuple<Boolean, PropertyInfo> key = Tuple.Create(!nonPublic, propertyInfo);
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return !nonPublic && !CacheGetMethods.Value.ContainsKey(key) && !propertyInfo.GetGetMethod(true).IsPublic
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? null
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: CacheGetMethods.Value
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.GetOrAdd(key,
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x => y => x.Item2.GetGetMethod(nonPublic).Invoke(y, null));
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}
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/// <summary>
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/// Gets a MethodInfo from a Property Set method.
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/// </summary>
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/// <param name="propertyInfo">The property information.</param>
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/// <param name="nonPublic">if set to <c>true</c> [non public].</param>
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/// <returns>
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/// The cached MethodInfo.
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/// </returns>
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public static Action<Object, Object[]> GetCacheSetMethod(this PropertyInfo propertyInfo, Boolean nonPublic = false) {
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Tuple<Boolean, PropertyInfo> key = Tuple.Create(!nonPublic, propertyInfo);
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return !nonPublic && !CacheSetMethods.Value.ContainsKey(key) && !propertyInfo.GetSetMethod(true).IsPublic
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? null
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: CacheSetMethods.Value
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.GetOrAdd(key,
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x => (obj, args) => x.Item2.GetSetMethod(nonPublic).Invoke(obj, args));
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}
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private static String ConvertObjectAndFormat(Type propertyType, Object value, String format) => propertyType == typeof(DateTime) || propertyType == typeof(DateTime?)
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? Convert.ToDateTime(value).ToString(format)
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: propertyType == typeof(Int32) || propertyType == typeof(Int32?)
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? Convert.ToInt32(value).ToString(format)
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: propertyType == typeof(Decimal) || propertyType == typeof(Decimal?)
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? Convert.ToDecimal(value).ToString(format)
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: propertyType == typeof(Double) || propertyType == typeof(Double?)
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? Convert.ToDouble(value).ToString(format)
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: propertyType == typeof(Byte) || propertyType == typeof(Byte?)
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? Convert.ToByte(value).ToString(format)
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: value?.ToString() ?? String.Empty;
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}
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} |