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PartBuilderOfT.cs
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PartBuilderOfT.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
namespace System.ComponentModel.Composition.Registration
{
public class PartBuilder<T> : PartBuilder
{
private sealed class PropertyExpressionAdapter
{
private readonly PropertyInfo _propertyInfo;
private readonly Action<ImportBuilder> _configureImport;
private readonly Action<ExportBuilder> _configureExport;
public PropertyExpressionAdapter(Expression<Func<T, object>> propertyFilter,
Action<ImportBuilder> configureImport = null,
Action<ExportBuilder> configureExport = null)
{
_propertyInfo = SelectProperties(propertyFilter);
_configureImport = configureImport;
_configureExport = configureExport;
}
public bool VerifyPropertyInfo(PropertyInfo pi)
{
return pi == _propertyInfo;
}
public void ConfigureImport(PropertyInfo propertyInfo, ImportBuilder importBuilder)
{
_configureImport?.Invoke(importBuilder);
}
public void ConfigureExport(PropertyInfo propertyInfo, ExportBuilder exportBuilder)
{
_configureExport?.Invoke(exportBuilder);
}
private static PropertyInfo SelectProperties(Expression<Func<T, object>> propertyFilter)
{
if (propertyFilter is null)
{
throw new ArgumentNullException(nameof(propertyFilter));
}
Expression expr = Reduce(propertyFilter).Body;
if (expr.NodeType == ExpressionType.MemberAccess)
{
MemberInfo memberInfo = ((MemberExpression)expr).Member;
if (memberInfo.MemberType == MemberTypes.Property)
{
return (PropertyInfo)memberInfo;
}
}
// An error occurred the expression must be a Property Member Expression
throw new ArgumentException(SR.Format(SR.Argument_ExpressionMustBePropertyMember, nameof(propertyFilter)), nameof(propertyFilter));
}
private static Expression<Func<T, object>> Reduce(Expression<Func<T, object>> expr)
{
while (expr.CanReduce)
{
expr = (Expression<Func<T, object>>)expr.Reduce();
}
return expr;
}
}
private sealed class ConstructorExpressionAdapter
{
private ConstructorInfo _constructorInfo;
private Dictionary<ParameterInfo, Action<ImportBuilder>> _importBuilders;
public ConstructorExpressionAdapter(Expression<Func<ParameterImportBuilder, T>> selectConstructor)
{
ParseSelectConstructor(selectConstructor);
}
public ConstructorInfo SelectConstructor(ConstructorInfo[] constructorInfos)
{
return _constructorInfo;
}
public void ConfigureConstructorImports(ParameterInfo parameterInfo, ImportBuilder importBuilder)
{
if (_importBuilders != null &&
_importBuilders.TryGetValue(parameterInfo, out Action<ImportBuilder> parameterImportBuilder))
{
parameterImportBuilder(importBuilder);
}
}
private void ParseSelectConstructor(Expression<Func<ParameterImportBuilder, T>> constructorFilter)
{
if (constructorFilter is null)
{
throw new ArgumentNullException(nameof(constructorFilter));
}
Expression expr = Reduce(constructorFilter).Body;
if (expr.NodeType != ExpressionType.New)
{
throw new ArgumentException(SR.Format(SR.Argument_ExpressionMustBePropertyMember, nameof(constructorFilter)), nameof(constructorFilter));
}
var newExpression = (NewExpression)expr;
_constructorInfo = newExpression.Constructor;
int index = 0;
ParameterInfo[] parameterInfos = _constructorInfo.GetParameters();
foreach (Expression argument in newExpression.Arguments)
{
if (argument.NodeType == ExpressionType.Call)
{
var methodCallExpression = (MethodCallExpression)argument;
if (methodCallExpression.Arguments.Count == 1)
{
Expression parameter = methodCallExpression.Arguments[0];
if (parameter.NodeType == ExpressionType.Lambda)
{
var lambdaExpression = (LambdaExpression)parameter;
Delegate importDelegate = lambdaExpression.Compile();
_importBuilders ??= new Dictionary<ParameterInfo, Action<ImportBuilder>>();
_importBuilders.Add(parameterInfos[index], (Action<ImportBuilder>)importDelegate);
++index;
}
}
}
}
}
private static Expression<Func<ParameterImportBuilder, T>> Reduce(Expression<Func<ParameterImportBuilder, T>> expr)
{
while (expr.CanReduce)
{
expr.Reduce();
}
return expr;
}
}
internal PartBuilder(Predicate<Type> selectType) : base(selectType)
{
}
public PartBuilder<T> SelectConstructor(Expression<Func<ParameterImportBuilder, T>> constructorFilter)
{
if (constructorFilter is null)
{
throw new ArgumentNullException(nameof(constructorFilter));
}
var adapter = new ConstructorExpressionAdapter(constructorFilter);
SelectConstructor(adapter.SelectConstructor, adapter.ConfigureConstructorImports);
return this;
}
public PartBuilder<T> ExportProperty(Expression<Func<T, object>> propertyFilter)
{
return ExportProperty(propertyFilter, null);
}
public PartBuilder<T> ExportProperty(
Expression<Func<T, object>> propertyFilter,
Action<ExportBuilder> exportConfiguration)
{
if (propertyFilter is null)
{
throw new ArgumentNullException(nameof(propertyFilter));
}
var adapter = new PropertyExpressionAdapter(propertyFilter, null, exportConfiguration);
ExportProperties(adapter.VerifyPropertyInfo, adapter.ConfigureExport);
return this;
}
public PartBuilder<T> ExportProperty<TContract>(Expression<Func<T, object>> propertyFilter)
{
return ExportProperty<TContract>(propertyFilter, null);
}
public PartBuilder<T> ExportProperty<TContract>(Expression<Func<T, object>> propertyFilter,
Action<ExportBuilder> exportConfiguration)
{
if (propertyFilter is null)
{
throw new ArgumentNullException(nameof(propertyFilter));
}
var adapter = new PropertyExpressionAdapter(propertyFilter, null, exportConfiguration);
ExportProperties<TContract>(adapter.VerifyPropertyInfo, adapter.ConfigureExport);
return this;
}
public PartBuilder<T> ImportProperty(Expression<Func<T, object>> propertyFilter)
{
return ImportProperty(propertyFilter, null);
}
public PartBuilder<T> ImportProperty(Expression<Func<T, object>> propertyFilter,
Action<ImportBuilder> importConfiguration)
{
if (propertyFilter is null)
{
throw new ArgumentNullException(nameof(propertyFilter));
}
var adapter = new PropertyExpressionAdapter(propertyFilter, importConfiguration, null);
ImportProperties(adapter.VerifyPropertyInfo, adapter.ConfigureImport);
return this;
}
public PartBuilder<T> ImportProperty<TContract>(Expression<Func<T, object>> propertyFilter)
{
return ImportProperty<TContract>(propertyFilter, null);
}
public PartBuilder<T> ImportProperty<TContract>(Expression<Func<T, object>> propertyFilter,
Action<ImportBuilder> importConfiguration)
{
if (propertyFilter is null)
{
throw new ArgumentNullException(nameof(propertyFilter));
}
var adapter = new PropertyExpressionAdapter(propertyFilter, importConfiguration, null);
ImportProperties<TContract>(adapter.VerifyPropertyInfo, adapter.ConfigureImport);
return this;
}
}
}