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//---------------------------------------------------------------------
// <copyright file="TypeSystem.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <summary>
// Utility functions for processing Expression trees
// </summary>
//
// @owner Microsoft
//---------------------------------------------------------------------
namespace System.Data.Services.Client
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
/// <summary>Utility functions for processing Expression trees</summary>
internal static class TypeSystem
{
/// <summary> Method map for methods in URI query options</summary>
private static readonly Dictionary<MethodInfo, string> expressionMethodMap;
/// <summary> VB Method map for methods in URI query options</summary>
private static readonly Dictionary<string, string> expressionVBMethodMap;
/// <summary> Properties that should be represented as methods</summary>
private static readonly Dictionary<PropertyInfo, MethodInfo> propertiesAsMethodsMap;
/// <summary> VB Assembly name</summary>
#if !ASTORIA_LIGHT
private const string VisualBasicAssemblyFullName = "Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=" + AssemblyRef.MicrosoftPublicKeyToken;
#else
private const string VisualBasicAssemblyFullName = "Microsoft.VisualBasic, Version=2.0.5.0, Culture=neutral, PublicKeyToken=" + AssemblyRef.MicrosoftSilverlightPublicKeyToken;
#endif
/// <summary>
/// Initializes method map
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline", Justification = "Cleaner code")]
static TypeSystem()
{
// string functions
#if !ASTORIA_LIGHT
const int ExpectedCount = 24;
#else
const int ExpectedCount = 22;
#endif
expressionMethodMap = new Dictionary<MethodInfo, string>(ExpectedCount, EqualityComparer<MethodInfo>.Default);
expressionMethodMap.Add(typeof(string).GetMethod("Contains", new Type[] { typeof(string) }), @"substringof");
expressionMethodMap.Add(typeof(string).GetMethod("EndsWith", new Type[] { typeof(string) }), @"endswith");
expressionMethodMap.Add(typeof(string).GetMethod("StartsWith", new Type[] { typeof(string) }), @"startswith");
expressionMethodMap.Add(typeof(string).GetMethod("IndexOf", new Type[] { typeof(string) }), @"indexof");
expressionMethodMap.Add(typeof(string).GetMethod("Replace", new Type[] { typeof(string), typeof(string) }), @"replace");
expressionMethodMap.Add(typeof(string).GetMethod("Substring", new Type[] { typeof(int) }), @"substring");
expressionMethodMap.Add(typeof(string).GetMethod("Substring", new Type[] { typeof(int), typeof(int) }), @"substring");
expressionMethodMap.Add(typeof(string).GetMethod("ToLower", Type.EmptyTypes), @"tolower");
expressionMethodMap.Add(typeof(string).GetMethod("ToUpper", Type.EmptyTypes), @"toupper");
expressionMethodMap.Add(typeof(string).GetMethod("Trim", Type.EmptyTypes), @"trim");
expressionMethodMap.Add(typeof(string).GetMethod("Concat", new Type[] { typeof(string), typeof(string) }, null), @"concat");
expressionMethodMap.Add(typeof(string).GetProperty("Length", typeof(int)).GetGetMethod(), @"length");
// datetime methods
expressionMethodMap.Add(typeof(DateTime).GetProperty("Day", typeof(int)).GetGetMethod(), @"day");
expressionMethodMap.Add(typeof(DateTime).GetProperty("Hour", typeof(int)).GetGetMethod(), @"hour");
expressionMethodMap.Add(typeof(DateTime).GetProperty("Month", typeof(int)).GetGetMethod(), @"month");
expressionMethodMap.Add(typeof(DateTime).GetProperty("Minute", typeof(int)).GetGetMethod(), @"minute");
expressionMethodMap.Add(typeof(DateTime).GetProperty("Second", typeof(int)).GetGetMethod(), @"second");
expressionMethodMap.Add(typeof(DateTime).GetProperty("Year", typeof(int)).GetGetMethod(), @"year");
// math methods
expressionMethodMap.Add(typeof(Math).GetMethod("Round", new Type[] { typeof(double) }), @"round");
expressionMethodMap.Add(typeof(Math).GetMethod("Round", new Type[] { typeof(decimal) }), @"round");
expressionMethodMap.Add(typeof(Math).GetMethod("Floor", new Type[] { typeof(double) }), @"floor");
#if !ASTORIA_LIGHT // Math.Floor(Decimal) not available
expressionMethodMap.Add(typeof(Math).GetMethod("Floor", new Type[] { typeof(decimal) }), @"floor");
#endif
expressionMethodMap.Add(typeof(Math).GetMethod("Ceiling", new Type[] { typeof(double) }), @"ceiling");
#if !ASTORIA_LIGHT // Math.Ceiling(Decimal) not available
expressionMethodMap.Add(typeof(Math).GetMethod("Ceiling", new Type[] { typeof(decimal) }), @"ceiling");
#endif
Debug.Assert(expressionMethodMap.Count == ExpectedCount, "expressionMethodMap.Count == ExpectedCount");
// vb methods
// lookup these by type name + method name
expressionVBMethodMap = new Dictionary<string, string>(EqualityComparer<string>.Default);
expressionVBMethodMap.Add("Microsoft.VisualBasic.Strings.Trim", @"trim");
expressionVBMethodMap.Add("Microsoft.VisualBasic.Strings.Len", @"length");
expressionVBMethodMap.Add("Microsoft.VisualBasic.Strings.Mid", @"substring");
expressionVBMethodMap.Add("Microsoft.VisualBasic.Strings.UCase", @"toupper");
expressionVBMethodMap.Add("Microsoft.VisualBasic.Strings.LCase", @"tolower");
expressionVBMethodMap.Add("Microsoft.VisualBasic.DateAndTime.Year", @"year");
expressionVBMethodMap.Add("Microsoft.VisualBasic.DateAndTime.Month", @"month");
expressionVBMethodMap.Add("Microsoft.VisualBasic.DateAndTime.Day", @"day");
expressionVBMethodMap.Add("Microsoft.VisualBasic.DateAndTime.Hour", @"hour");
expressionVBMethodMap.Add("Microsoft.VisualBasic.DateAndTime.Minute", @"minute");
expressionVBMethodMap.Add("Microsoft.VisualBasic.DateAndTime.Second", @"second");
Debug.Assert(expressionVBMethodMap.Count == 11, "expressionVBMethodMap.Count == 11");
propertiesAsMethodsMap = new Dictionary<PropertyInfo, MethodInfo>(EqualityComparer<PropertyInfo>.Default);
propertiesAsMethodsMap.Add(
typeof(string).GetProperty("Length", typeof(int)),
typeof(string).GetProperty("Length", typeof(int)).GetGetMethod());
propertiesAsMethodsMap.Add(
typeof(DateTime).GetProperty("Day", typeof(int)),
typeof(DateTime).GetProperty("Day", typeof(int)).GetGetMethod());
propertiesAsMethodsMap.Add(
typeof(DateTime).GetProperty("Hour", typeof(int)),
typeof(DateTime).GetProperty("Hour", typeof(int)).GetGetMethod());
propertiesAsMethodsMap.Add(
typeof(DateTime).GetProperty("Minute", typeof(int)),
typeof(DateTime).GetProperty("Minute", typeof(int)).GetGetMethod());
propertiesAsMethodsMap.Add(
typeof(DateTime).GetProperty("Second", typeof(int)),
typeof(DateTime).GetProperty("Second", typeof(int)).GetGetMethod());
propertiesAsMethodsMap.Add(
typeof(DateTime).GetProperty("Month", typeof(int)),
typeof(DateTime).GetProperty("Month", typeof(int)).GetGetMethod());
propertiesAsMethodsMap.Add(
typeof(DateTime).GetProperty("Year", typeof(int)),
typeof(DateTime).GetProperty("Year", typeof(int)).GetGetMethod());
Debug.Assert(propertiesAsMethodsMap.Count == 7, "propertiesAsMethodsMap.Count == 7");
}
/// <summary>
/// Sees if method has URI equivalent
/// </summary>
/// <param name="mi">The method info</param>
/// <param name="methodName">uri method name</param>
/// <returns>true/ false</returns>
internal static bool TryGetQueryOptionMethod(MethodInfo mi, out string methodName)
{
return (expressionMethodMap.TryGetValue(mi, out methodName) ||
(mi.DeclaringType.Assembly.FullName == VisualBasicAssemblyFullName &&
expressionVBMethodMap.TryGetValue(mi.DeclaringType.FullName + "." + mi.Name, out methodName)));
}
/// <summary>
/// Sees if property can be represented as method for translation to URI
/// </summary>
/// <param name="pi">The property info</param>
/// <param name="mi">get method for property</param>
/// <returns>true/ false</returns>
internal static bool TryGetPropertyAsMethod(PropertyInfo pi, out MethodInfo mi)
{
return propertiesAsMethodsMap.TryGetValue(pi, out mi);
}
/// <summary>
/// Gets the elementtype for a sequence
/// </summary>
/// <param name="seqType">The sequence type</param>
/// <returns>The element type</returns>
internal static Type GetElementType(Type seqType)
{
Type ienum = FindIEnumerable(seqType);
if (ienum == null)
{
return seqType;
}
return ienum.GetGenericArguments()[0];
}
/// <summary>
/// Determines whether a property is private
/// </summary>
/// <param name="pi">The PropertyInfo structure for the property</param>
/// <returns>true/ false if property is private</returns>
internal static bool IsPrivate(PropertyInfo pi)
{
MethodInfo mi = pi.GetGetMethod() ?? pi.GetSetMethod();
if (mi != null)
{
return mi.IsPrivate;
}
return true;
}
/// <summary>
/// Finds type that implements IEnumerable so can get elemtent type
/// </summary>
/// <param name="seqType">The Type to check</param>
/// <returns>returns the type which implements IEnumerable</returns>
internal static Type FindIEnumerable(Type seqType)
{
if (seqType == null || seqType == typeof(string))
{
return null;
}
if (seqType.IsArray)
{
return typeof(IEnumerable<>).MakeGenericType(seqType.GetElementType());
}
if (seqType.IsGenericType)
{
foreach (Type arg in seqType.GetGenericArguments())
{
Type ienum = typeof(IEnumerable<>).MakeGenericType(arg);
if (ienum.IsAssignableFrom(seqType))
{
return ienum;
}
}
}
Type[] ifaces = seqType.GetInterfaces();
if (ifaces != null && ifaces.Length > 0)
{
foreach (Type iface in ifaces)
{
Type ienum = FindIEnumerable(iface);
if (ienum != null)
{
return ienum;
}
}
}
if (seqType.BaseType != null && seqType.BaseType != typeof(object))
{
return FindIEnumerable(seqType.BaseType);
}
return null;
}
}
}
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