456 lines
19 KiB
C#
456 lines
19 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.Linq;
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using System.Reflection;
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namespace WebAPI.Areas.HelpPage
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{
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/// <summary>
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/// This class will create an object of a given type and populate it with sample data.
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/// </summary>
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public class ObjectGenerator
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{
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internal const int DefaultCollectionSize = 2;
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private readonly SimpleTypeObjectGenerator SimpleObjectGenerator = new SimpleTypeObjectGenerator();
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/// <summary>
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/// Generates an object for a given type. The type needs to be public, have a public default constructor and settable public properties/fields. Currently it supports the following types:
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/// Simple types: <see cref="int"/>, <see cref="string"/>, <see cref="Enum"/>, <see cref="DateTime"/>, <see cref="Uri"/>, etc.
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/// Complex types: POCO types.
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/// Nullables: <see cref="Nullable{T}"/>.
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/// Arrays: arrays of simple types or complex types.
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/// Key value pairs: <see cref="KeyValuePair{TKey,TValue}"/>
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/// Tuples: <see cref="Tuple{T1}"/>, <see cref="Tuple{T1,T2}"/>, etc
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/// Dictionaries: <see cref="IDictionary{TKey,TValue}"/> or anything deriving from <see cref="IDictionary{TKey,TValue}"/>.
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/// Collections: <see cref="IList{T}"/>, <see cref="IEnumerable{T}"/>, <see cref="ICollection{T}"/>, <see cref="IList"/>, <see cref="IEnumerable"/>, <see cref="ICollection"/> or anything deriving from <see cref="ICollection{T}"/> or <see cref="IList"/>.
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/// Queryables: <see cref="IQueryable"/>, <see cref="IQueryable{T}"/>.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>An object of the given type.</returns>
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public object GenerateObject(Type type)
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{
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return GenerateObject(type, new Dictionary<Type, object>());
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}
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Here we just want to return null if anything goes wrong.")]
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private object GenerateObject(Type type, Dictionary<Type, object> createdObjectReferences)
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{
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try
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{
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if (SimpleTypeObjectGenerator.CanGenerateObject(type))
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{
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return SimpleObjectGenerator.GenerateObject(type);
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}
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if (type.IsArray)
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{
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return GenerateArray(type, DefaultCollectionSize, createdObjectReferences);
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}
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if (type.IsGenericType)
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{
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return GenerateGenericType(type, DefaultCollectionSize, createdObjectReferences);
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}
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if (type == typeof(IDictionary))
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{
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return GenerateDictionary(typeof(Hashtable), DefaultCollectionSize, createdObjectReferences);
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}
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if (typeof(IDictionary).IsAssignableFrom(type))
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{
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return GenerateDictionary(type, DefaultCollectionSize, createdObjectReferences);
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}
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if (type == typeof(IList) ||
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type == typeof(IEnumerable) ||
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type == typeof(ICollection))
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{
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return GenerateCollection(typeof(ArrayList), DefaultCollectionSize, createdObjectReferences);
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}
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if (typeof(IList).IsAssignableFrom(type))
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{
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return GenerateCollection(type, DefaultCollectionSize, createdObjectReferences);
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}
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if (type == typeof(IQueryable))
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{
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return GenerateQueryable(type, DefaultCollectionSize, createdObjectReferences);
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}
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if (type.IsEnum)
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{
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return GenerateEnum(type);
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}
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if (type.IsPublic || type.IsNestedPublic)
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{
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return GenerateComplexObject(type, createdObjectReferences);
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}
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}
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catch
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{
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// Returns null if anything fails
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return null;
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}
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return null;
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}
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private static object GenerateGenericType(Type type, int collectionSize, Dictionary<Type, object> createdObjectReferences)
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{
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Type genericTypeDefinition = type.GetGenericTypeDefinition();
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if (genericTypeDefinition == typeof(Nullable<>))
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{
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return GenerateNullable(type, createdObjectReferences);
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}
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if (genericTypeDefinition == typeof(KeyValuePair<,>))
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{
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return GenerateKeyValuePair(type, createdObjectReferences);
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}
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if (IsTuple(genericTypeDefinition))
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{
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return GenerateTuple(type, createdObjectReferences);
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}
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Type[] genericArguments = type.GetGenericArguments();
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if (genericArguments.Length == 1)
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{
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if (genericTypeDefinition == typeof(IList<>) ||
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genericTypeDefinition == typeof(IEnumerable<>) ||
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genericTypeDefinition == typeof(ICollection<>))
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{
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Type collectionType = typeof(List<>).MakeGenericType(genericArguments);
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return GenerateCollection(collectionType, collectionSize, createdObjectReferences);
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}
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if (genericTypeDefinition == typeof(IQueryable<>))
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{
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return GenerateQueryable(type, collectionSize, createdObjectReferences);
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}
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Type closedCollectionType = typeof(ICollection<>).MakeGenericType(genericArguments[0]);
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if (closedCollectionType.IsAssignableFrom(type))
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{
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return GenerateCollection(type, collectionSize, createdObjectReferences);
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}
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}
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if (genericArguments.Length == 2)
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{
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if (genericTypeDefinition == typeof(IDictionary<,>))
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{
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Type dictionaryType = typeof(Dictionary<,>).MakeGenericType(genericArguments);
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return GenerateDictionary(dictionaryType, collectionSize, createdObjectReferences);
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}
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Type closedDictionaryType = typeof(IDictionary<,>).MakeGenericType(genericArguments[0], genericArguments[1]);
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if (closedDictionaryType.IsAssignableFrom(type))
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{
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return GenerateDictionary(type, collectionSize, createdObjectReferences);
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}
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}
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if (type.IsPublic || type.IsNestedPublic)
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{
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return GenerateComplexObject(type, createdObjectReferences);
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}
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return null;
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}
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private static object GenerateTuple(Type type, Dictionary<Type, object> createdObjectReferences)
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{
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Type[] genericArgs = type.GetGenericArguments();
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object[] parameterValues = new object[genericArgs.Length];
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bool failedToCreateTuple = true;
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ObjectGenerator objectGenerator = new ObjectGenerator();
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for (int i = 0; i < genericArgs.Length; i++)
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{
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parameterValues[i] = objectGenerator.GenerateObject(genericArgs[i], createdObjectReferences);
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failedToCreateTuple &= parameterValues[i] == null;
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}
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if (failedToCreateTuple)
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{
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return null;
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}
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object result = Activator.CreateInstance(type, parameterValues);
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return result;
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}
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private static bool IsTuple(Type genericTypeDefinition)
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{
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return genericTypeDefinition == typeof(Tuple<>) ||
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genericTypeDefinition == typeof(Tuple<,>) ||
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genericTypeDefinition == typeof(Tuple<,,>) ||
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genericTypeDefinition == typeof(Tuple<,,,>) ||
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genericTypeDefinition == typeof(Tuple<,,,,>) ||
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genericTypeDefinition == typeof(Tuple<,,,,,>) ||
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genericTypeDefinition == typeof(Tuple<,,,,,,>) ||
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genericTypeDefinition == typeof(Tuple<,,,,,,,>);
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}
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private static object GenerateKeyValuePair(Type keyValuePairType, Dictionary<Type, object> createdObjectReferences)
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{
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Type[] genericArgs = keyValuePairType.GetGenericArguments();
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Type typeK = genericArgs[0];
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Type typeV = genericArgs[1];
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ObjectGenerator objectGenerator = new ObjectGenerator();
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object keyObject = objectGenerator.GenerateObject(typeK, createdObjectReferences);
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object valueObject = objectGenerator.GenerateObject(typeV, createdObjectReferences);
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if (keyObject == null && valueObject == null)
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{
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// Failed to create key and values
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return null;
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}
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object result = Activator.CreateInstance(keyValuePairType, keyObject, valueObject);
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return result;
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}
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private static object GenerateArray(Type arrayType, int size, Dictionary<Type, object> createdObjectReferences)
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{
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Type type = arrayType.GetElementType();
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Array result = Array.CreateInstance(type, size);
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bool areAllElementsNull = true;
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ObjectGenerator objectGenerator = new ObjectGenerator();
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for (int i = 0; i < size; i++)
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{
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object element = objectGenerator.GenerateObject(type, createdObjectReferences);
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result.SetValue(element, i);
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areAllElementsNull &= element == null;
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}
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if (areAllElementsNull)
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{
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return null;
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}
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return result;
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}
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private static object GenerateDictionary(Type dictionaryType, int size, Dictionary<Type, object> createdObjectReferences)
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{
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Type typeK = typeof(object);
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Type typeV = typeof(object);
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if (dictionaryType.IsGenericType)
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{
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Type[] genericArgs = dictionaryType.GetGenericArguments();
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typeK = genericArgs[0];
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typeV = genericArgs[1];
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}
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object result = Activator.CreateInstance(dictionaryType);
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MethodInfo addMethod = dictionaryType.GetMethod("Add") ?? dictionaryType.GetMethod("TryAdd");
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MethodInfo containsMethod = dictionaryType.GetMethod("Contains") ?? dictionaryType.GetMethod("ContainsKey");
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ObjectGenerator objectGenerator = new ObjectGenerator();
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for (int i = 0; i < size; i++)
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{
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object newKey = objectGenerator.GenerateObject(typeK, createdObjectReferences);
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if (newKey == null)
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{
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// Cannot generate a valid key
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return null;
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}
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bool containsKey = (bool)containsMethod.Invoke(result, new object[] { newKey });
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if (!containsKey)
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{
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object newValue = objectGenerator.GenerateObject(typeV, createdObjectReferences);
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addMethod.Invoke(result, new object[] { newKey, newValue });
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}
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}
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return result;
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}
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private static object GenerateEnum(Type enumType)
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{
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Array possibleValues = Enum.GetValues(enumType);
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if (possibleValues.Length > 0)
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{
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return possibleValues.GetValue(0);
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}
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return null;
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}
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private static object GenerateQueryable(Type queryableType, int size, Dictionary<Type, object> createdObjectReferences)
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{
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bool isGeneric = queryableType.IsGenericType;
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object list;
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if (isGeneric)
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{
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Type listType = typeof(List<>).MakeGenericType(queryableType.GetGenericArguments());
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list = GenerateCollection(listType, size, createdObjectReferences);
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}
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else
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{
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list = GenerateArray(typeof(object[]), size, createdObjectReferences);
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}
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if (list == null)
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{
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return null;
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}
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if (isGeneric)
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{
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Type argumentType = typeof(IEnumerable<>).MakeGenericType(queryableType.GetGenericArguments());
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MethodInfo asQueryableMethod = typeof(Queryable).GetMethod("AsQueryable", new[] { argumentType });
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return asQueryableMethod.Invoke(null, new[] { list });
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}
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return Queryable.AsQueryable((IEnumerable)list);
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}
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private static object GenerateCollection(Type collectionType, int size, Dictionary<Type, object> createdObjectReferences)
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{
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Type type = collectionType.IsGenericType ?
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collectionType.GetGenericArguments()[0] :
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typeof(object);
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object result = Activator.CreateInstance(collectionType);
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MethodInfo addMethod = collectionType.GetMethod("Add");
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bool areAllElementsNull = true;
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ObjectGenerator objectGenerator = new ObjectGenerator();
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for (int i = 0; i < size; i++)
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{
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object element = objectGenerator.GenerateObject(type, createdObjectReferences);
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addMethod.Invoke(result, new object[] { element });
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areAllElementsNull &= element == null;
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}
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if (areAllElementsNull)
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{
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return null;
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}
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return result;
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}
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private static object GenerateNullable(Type nullableType, Dictionary<Type, object> createdObjectReferences)
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{
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Type type = nullableType.GetGenericArguments()[0];
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ObjectGenerator objectGenerator = new ObjectGenerator();
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return objectGenerator.GenerateObject(type, createdObjectReferences);
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}
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private static object GenerateComplexObject(Type type, Dictionary<Type, object> createdObjectReferences)
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{
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object result = null;
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if (createdObjectReferences.TryGetValue(type, out result))
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{
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// The object has been created already, just return it. This will handle the circular reference case.
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return result;
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}
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if (type.IsValueType)
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{
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result = Activator.CreateInstance(type);
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}
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else
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{
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ConstructorInfo defaultCtor = type.GetConstructor(Type.EmptyTypes);
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if (defaultCtor == null)
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{
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// Cannot instantiate the type because it doesn't have a default constructor
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return null;
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}
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result = defaultCtor.Invoke(new object[0]);
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}
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createdObjectReferences.Add(type, result);
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SetPublicProperties(type, result, createdObjectReferences);
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SetPublicFields(type, result, createdObjectReferences);
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return result;
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}
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private static void SetPublicProperties(Type type, object obj, Dictionary<Type, object> createdObjectReferences)
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{
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PropertyInfo[] properties = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
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ObjectGenerator objectGenerator = new ObjectGenerator();
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foreach (PropertyInfo property in properties)
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{
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if (property.CanWrite)
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{
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object propertyValue = objectGenerator.GenerateObject(property.PropertyType, createdObjectReferences);
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property.SetValue(obj, propertyValue, null);
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}
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}
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}
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private static void SetPublicFields(Type type, object obj, Dictionary<Type, object> createdObjectReferences)
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{
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FieldInfo[] fields = type.GetFields(BindingFlags.Public | BindingFlags.Instance);
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ObjectGenerator objectGenerator = new ObjectGenerator();
|
||
|
|
foreach (FieldInfo field in fields)
|
||
|
|
{
|
||
|
|
object fieldValue = objectGenerator.GenerateObject(field.FieldType, createdObjectReferences);
|
||
|
|
field.SetValue(obj, fieldValue);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private class SimpleTypeObjectGenerator
|
||
|
|
{
|
||
|
|
private long _index = 0;
|
||
|
|
private static readonly Dictionary<Type, Func<long, object>> DefaultGenerators = InitializeGenerators();
|
||
|
|
|
||
|
|
[SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification = "These are simple type factories and cannot be split up.")]
|
||
|
|
private static Dictionary<Type, Func<long, object>> InitializeGenerators()
|
||
|
|
{
|
||
|
|
return new Dictionary<Type, Func<long, object>>
|
||
|
|
{
|
||
|
|
{ typeof(Boolean), index => true },
|
||
|
|
{ typeof(Byte), index => (Byte)64 },
|
||
|
|
{ typeof(Char), index => (Char)65 },
|
||
|
|
{ typeof(DateTime), index => DateTime.Now },
|
||
|
|
{ typeof(DateTimeOffset), index => new DateTimeOffset(DateTime.Now) },
|
||
|
|
{ typeof(DBNull), index => DBNull.Value },
|
||
|
|
{ typeof(Decimal), index => (Decimal)index },
|
||
|
|
{ typeof(Double), index => (Double)(index + 0.1) },
|
||
|
|
{ typeof(Guid), index => Guid.NewGuid() },
|
||
|
|
{ typeof(Int16), index => (Int16)(index % Int16.MaxValue) },
|
||
|
|
{ typeof(Int32), index => (Int32)(index % Int32.MaxValue) },
|
||
|
|
{ typeof(Int64), index => (Int64)index },
|
||
|
|
{ typeof(Object), index => new object() },
|
||
|
|
{ typeof(SByte), index => (SByte)64 },
|
||
|
|
{ typeof(Single), index => (Single)(index + 0.1) },
|
||
|
|
{
|
||
|
|
typeof(String), index =>
|
||
|
|
{
|
||
|
|
return String.Format(CultureInfo.CurrentCulture, "sample string {0}", index);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
{
|
||
|
|
typeof(TimeSpan), index =>
|
||
|
|
{
|
||
|
|
return TimeSpan.FromTicks(1234567);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
{ typeof(UInt16), index => (UInt16)(index % UInt16.MaxValue) },
|
||
|
|
{ typeof(UInt32), index => (UInt32)(index % UInt32.MaxValue) },
|
||
|
|
{ typeof(UInt64), index => (UInt64)index },
|
||
|
|
{
|
||
|
|
typeof(Uri), index =>
|
||
|
|
{
|
||
|
|
return new Uri(String.Format(CultureInfo.CurrentCulture, "http://webapihelppage{0}.com", index));
|
||
|
|
}
|
||
|
|
},
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
public static bool CanGenerateObject(Type type)
|
||
|
|
{
|
||
|
|
return DefaultGenerators.ContainsKey(type);
|
||
|
|
}
|
||
|
|
|
||
|
|
public object GenerateObject(Type type)
|
||
|
|
{
|
||
|
|
return DefaultGenerators[type](++_index);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|