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ResourceConfigurationBuilder.cs
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ResourceConfigurationBuilder.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using NJsonApi.Conventions;
using NJsonApi.Utils;
namespace NJsonApi
{
public class ResourceConfigurationBuilder<TResource> : IResourceConfigurationBuilder
{
public IResourceMapping ConstructedMetadata { get; set; }
public ConfigurationBuilder ConfigurationBuilder { get; set; }
public IResourceTypeConvention ResourceTypeConvention { get; set; }
public ILinkNameConvention LinkNameConvention { get; set; }
public ILinkIdConvention LinkIdConvention { get; set; }
public IPropertyScanningConvention PropertyScanningConvention { get; set; }
public ResourceConfigurationBuilder(ConfigurationBuilder configurationBuilder)
{
ConfigurationBuilder = configurationBuilder;
ResourceTypeConvention = configurationBuilder.GetConvention<IResourceTypeConvention>();
LinkNameConvention = configurationBuilder.GetConvention<ILinkNameConvention>();
LinkIdConvention = configurationBuilder.GetConvention<ILinkIdConvention>();
PropertyScanningConvention = configurationBuilder.GetConvention<IPropertyScanningConvention>();
ConstructedMetadata = new ResourceMapping<TResource>
{
ResourceType = ResourceTypeConvention.GetResourceTypeFromRepresentationType(typeof(TResource))
};
}
public ResourceConfigurationBuilder<TResource> WithResourceType(string resourceType)
{
ConstructedMetadata.ResourceType = resourceType;
return this;
}
public ResourceConfigurationBuilder<TResource> WithIdSelector(Expression<Func<TResource, object>> expression)
{
ConstructedMetadata.IdGetter = ExpressionUtils.CompileToObjectTypedFunction(expression);
ConstructedMetadata.IdSetter = CreateIdSetter(ExpressionUtils.GetPropertyInfoFromExpression(expression));
return this;
}
public ResourceConfigurationBuilder<TResource> WithSimpleProperty(Expression<Func<TResource, object>> propertyAccessor)
{
var propertyInfo = ExpressionUtils.GetPropertyInfoFromExpression(propertyAccessor);
AddProperty(propertyInfo, typeof(TResource));
return this;
}
public ResourceConfigurationBuilder<TResource> WithSimpleProperty(Expression<Func<TResource, object>> propertyAccessor, SerializationDirection direction)
{
var propertyInfo = ExpressionUtils.GetPropertyInfoFromExpression(propertyAccessor);
RemoveProperty(propertyInfo);
AddProperty(propertyInfo, typeof(TResource), direction);
return this;
}
public ResourceConfigurationBuilder<TResource> IgnoreProperty(Expression<Func<TResource, object>> propertyAccessor)
{
var pi = ExpressionUtils.GetPropertyInfoFromExpression(propertyAccessor);
RemoveProperty(pi);
return this;
}
public ResourceConfigurationBuilder<TResource> WithLinkTemplate(string link)
{
ConstructedMetadata.UrlTemplate = link;
return this;
}
/// <summary>
/// Registers through discovery all properties that are considered primitive, i.e. not linked resources.
/// </summary>
/// <remarks>
/// Conventions used:
/// IProperyScanningConvention
///
/// Supply a custom implementations to alter behavior.
/// </remarks>
public ResourceConfigurationBuilder<TResource> WithAllSimpleProperties()
{
foreach (var propertyInfo in typeof(TResource).GetProperties())
{
if (PropertyScanningConvention.IsPrimaryId(propertyInfo))
{
ConstructedMetadata.IdGetter = propertyInfo.GetValue;
PropertyInfo info = propertyInfo;
ConstructedMetadata.IdSetter = CreateIdSetter(info);
}
else if (!PropertyScanningConvention.IsLinkedResource(propertyInfo) && !PropertyScanningConvention.ShouldIgnore(propertyInfo))
AddProperty(propertyInfo, typeof(TResource));
}
return this;
}
private static Action<object, string> CreateIdSetter(PropertyInfo info)
{
return (o, s) => info.SetValue(o, ParseStringIntoT(info.PropertyType, s));
}
public static object ParseStringIntoT(Type t, string s)
{
var foo = TypeDescriptor.GetConverter(t);
return foo.ConvertFromInvariantString(s);
}
/// <summary>
/// Registers through discovery all properties, including primitive properties and linked resources.
/// </summary>
/// <remarks>
/// Conventions used:
/// IResourceTypeConvention
/// ILinkIdConvention
/// ILinkNameConvention
/// IProperyScanningConvention
///
/// Supply a custom implementations to alter behavior.
/// </remarks>
public ResourceConfigurationBuilder<TResource> WithAllProperties()
{
WithAllSimpleProperties();
WithAllLinkedResources();
return this;
}
/// <summary>
/// Registers all properties discovered to be linked resources.
/// </summary>
/// <remarks>
/// Conventions used:
/// IResourceTypeConvention
/// ILinkIdConvention
/// ILinkNameConvention
/// IProperyScanningConvention
///
/// Supply a custom implementations to alter behavior.
/// </remarks>
public ResourceConfigurationBuilder<TResource> WithAllLinkedResources()
{
MethodInfo openMethod = GetType().GetMethod("WithLinkedResource");
foreach (var propertyInfo in typeof(TResource).GetProperties())
{
if (PropertyScanningConvention.IsLinkedResource(propertyInfo) &&
!PropertyScanningConvention.ShouldIgnore(propertyInfo))
{
var nestedType = propertyInfo.PropertyType;
var parameterExp = Expression.Parameter(typeof(TResource));
var propertyExp = Expression.Property(parameterExp, propertyInfo);
var propertyAccessor = Expression.Lambda(propertyExp, parameterExp);
// Because the expression is constructed in run-time and we need to invoke the convention that expects
// a compile-time-safe generic method, reflection must be used to invoke it.
MethodInfo closedMethod = openMethod.MakeGenericMethod(nestedType);
closedMethod.Invoke(this, new object[] { propertyAccessor, null, null, null, ResourceInclusionRules.Smart });
}
}
return this;
}
private Type GetItemType(Type ienumerableType)
{
return ienumerableType
.GetInterfaces()
.Where(t => t.IsGenericType && t.GetGenericTypeDefinition() == typeof(IEnumerable<>))
.Select(t => t.GetGenericArguments()[0])
.SingleOrDefault();
}
/// <summary>
///
/// </summary>
/// <remarks>
/// Conventions used:
/// IResourceTypeConvention
/// ILinkIdConvention
/// ILinkNameConvention
///
/// Supply a custom implementations to alter behavior.
/// </remarks>
public ResourceConfigurationBuilder<TResource> WithLinkedResource<TNested>(Expression<Func<TResource, TNested>> objectAccessor, Expression<Func<TResource, object>> idAccessor = null, string linkedResourceType = null, string linkName = null, ResourceInclusionRules inclusionRule = ResourceInclusionRules.Smart) where TNested : class
{
if (typeof(TNested).Name == "Array")
throw new NotSupportedException("Array type is not supported!");
var propertyInfo = ExpressionUtils.GetPropertyInfoFromExpression(objectAccessor);
var isCollection = typeof(IEnumerable).IsAssignableFrom(propertyInfo.PropertyType);
var linkedType = isCollection ? GetItemType(typeof(TNested)) : typeof(TNested);
if (linkName == null) linkName = LinkNameConvention.GetLinkNameFromExpression(objectAccessor);
if (linkedResourceType == null) linkedResourceType = ResourceTypeConvention.GetResourceTypeFromRepresentationType(linkedType);
if (idAccessor == null) idAccessor = LinkIdConvention.GetIdExpression(objectAccessor);
var link = new LinkMapping<TResource, TNested>
{
RelationshipName = linkName,
ResourceIdGetter = idAccessor,
ResourceGetter = ExpressionUtils.CompileToObjectTypedExpression(objectAccessor),
IsCollection = isCollection,
RelatedCollectionProperty = isCollection ? propertyInfo : null,
RelatedBaseType = linkedType,
RelatedBaseResourceType = linkedResourceType,
InclusionRule = inclusionRule
};
ConstructedMetadata.Relationships.Add(link);
return this;
}
private void AddProperty(PropertyInfo propertyInfo, Type type, SerializationDirection direction = SerializationDirection.Both)
{
var name = PropertyScanningConvention.GetPropertyName(propertyInfo);
if (ConstructedMetadata.PropertyGetters.ContainsKey(name) ||
ConstructedMetadata.PropertySetters.ContainsKey(name))
{
throw new InvalidOperationException(string.Format("Property {0} is already registered on type {1}.", name, typeof(TResource)));
}
if (direction == SerializationDirection.Out || direction == SerializationDirection.Both)
{
ConstructedMetadata.PropertyGetters[name] = propertyInfo.GetValue;
}
if (direction == SerializationDirection.In || direction == SerializationDirection.Both)
{
ConstructedMetadata.PropertySetters[name] = propertyInfo.SetValue;
}
var instance = Expression.Parameter(typeof(object), "i");
var argument = Expression.Parameter(typeof(object), "a");
var setterCall = Expression.Call(
Expression.Convert(instance, propertyInfo.DeclaringType),
propertyInfo.GetSetMethod(),
Expression.Convert(argument, propertyInfo.PropertyType));
Expression<Action<object, object>> expression = Expression.Lambda<Action<object, object>>(setterCall, instance, argument);
if (direction == SerializationDirection.In || direction == SerializationDirection.Both)
{
ConstructedMetadata.PropertySettersExpressions[name] = expression;
}
}
private void RemoveProperty(PropertyInfo propertyInfo)
{
var name = PropertyScanningConvention.GetPropertyName(propertyInfo);
ConstructedMetadata.PropertyGetters.Remove(name);
ConstructedMetadata.PropertySetters.Remove(name);
ConstructedMetadata.PropertySettersExpressions.Remove(name);
}
}
}