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SqlServerGeometryMethodTranslator.cs
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SqlServerGeometryMethodTranslator.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 Microsoft.EntityFrameworkCore.Query.SqlExpressions;
using NetTopologySuite.Geometries;
using ExpressionExtensions = Microsoft.EntityFrameworkCore.Query.ExpressionExtensions;
namespace Microsoft.EntityFrameworkCore.SqlServer.Query.Internal;
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public class SqlServerGeometryMethodTranslator : IMethodCallTranslator
{
private static readonly IDictionary<MethodInfo, string> MethodToFunctionName = new Dictionary<MethodInfo, string>
{
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.AsBinary), Type.EmptyTypes)!, "STAsBinary" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.AsText), Type.EmptyTypes)!, "AsTextZM" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Buffer), new[] { typeof(double) })!, "STBuffer" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Contains), new[] { typeof(Geometry) })!, "STContains" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.ConvexHull), Type.EmptyTypes)!, "STConvexHull" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Difference), new[] { typeof(Geometry) })!, "STDifference" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Disjoint), new[] { typeof(Geometry) })!, "STDisjoint" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Distance), new[] { typeof(Geometry) })!, "STDistance" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.EqualsTopologically), new[] { typeof(Geometry) })!, "STEquals" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Intersection), new[] { typeof(Geometry) })!, "STIntersection" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Intersects), new[] { typeof(Geometry) })!, "STIntersects" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Overlaps), new[] { typeof(Geometry) })!, "STOverlaps" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.SymmetricDifference), new[] { typeof(Geometry) })!, "STSymDifference" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.ToBinary), Type.EmptyTypes)!, "STAsBinary" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.ToText), Type.EmptyTypes)!, "AsTextZM" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Union), new[] { typeof(Geometry) })!, "STUnion" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Within), new[] { typeof(Geometry) })!, "STWithin" }
};
private static readonly IDictionary<MethodInfo, string> GeometryMethodToFunctionName = new Dictionary<MethodInfo, string>
{
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Crosses), new[] { typeof(Geometry) })!, "STCrosses" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Relate), new[] { typeof(Geometry), typeof(string) })!, "STRelate" },
{ typeof(Geometry).GetRuntimeMethod(nameof(Geometry.Touches), new[] { typeof(Geometry) })!, "STTouches" }
};
private static readonly MethodInfo GetGeometryN = typeof(Geometry).GetRuntimeMethod(
nameof(Geometry.GetGeometryN), new[] { typeof(int) })!;
private static readonly MethodInfo IsWithinDistance = typeof(Geometry).GetRuntimeMethod(
nameof(Geometry.IsWithinDistance), new[] { typeof(Geometry), typeof(double) })!;
private readonly IRelationalTypeMappingSource _typeMappingSource;
private readonly ISqlExpressionFactory _sqlExpressionFactory;
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public SqlServerGeometryMethodTranslator(
IRelationalTypeMappingSource typeMappingSource,
ISqlExpressionFactory sqlExpressionFactory)
{
_typeMappingSource = typeMappingSource;
_sqlExpressionFactory = sqlExpressionFactory;
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual SqlExpression? Translate(
SqlExpression? instance,
MethodInfo method,
IReadOnlyList<SqlExpression> arguments,
IDiagnosticsLogger<DbLoggerCategory.Query> logger)
{
if (typeof(Geometry).IsAssignableFrom(method.DeclaringType)
&& instance != null)
{
var geometryExpressions = new[] { instance }.Concat(
arguments.Where(e => typeof(Geometry).IsAssignableFrom(e.Type)));
var typeMapping = ExpressionExtensions.InferTypeMapping(geometryExpressions.ToArray());
if (typeMapping is null)
{
Check.DebugFail("At least one argument must have typeMapping.");
return null;
}
var storeType = typeMapping.StoreType;
var isGeography = string.Equals(storeType, "geography", StringComparison.OrdinalIgnoreCase);
if (MethodToFunctionName.TryGetValue(method, out var functionName)
|| (!isGeography && GeometryMethodToFunctionName.TryGetValue(method, out functionName)))
{
instance = _sqlExpressionFactory.ApplyTypeMapping(
instance, _typeMappingSource.FindMapping(instance.Type, storeType));
var typeMappedArguments = new List<SqlExpression>();
foreach (var argument in arguments)
{
typeMappedArguments.Add(
_sqlExpressionFactory.ApplyTypeMapping(
argument,
typeof(Geometry).IsAssignableFrom(argument.Type)
? _typeMappingSource.FindMapping(argument.Type, storeType)
: _typeMappingSource.FindMapping(argument.Type)));
}
var resultTypeMapping = typeof(Geometry).IsAssignableFrom(method.ReturnType)
? _typeMappingSource.FindMapping(method.ReturnType, storeType)
: _typeMappingSource.FindMapping(method.ReturnType);
var finalArguments = Simplify(typeMappedArguments, isGeography);
var argumentsPropagateNullability = functionName == "STBuffer"
? new[] { false }
: functionName == "STRelate"
? new[] { true, false }
: finalArguments.Select(_ => true).ToArray();
return _sqlExpressionFactory.Function(
instance,
functionName,
finalArguments,
nullable: true,
instancePropagatesNullability: true,
argumentsPropagateNullability,
method.ReturnType,
resultTypeMapping);
}
if (Equals(method, GetGeometryN))
{
return _sqlExpressionFactory.Function(
instance,
"STGeometryN",
new[]
{
_sqlExpressionFactory.Add(
arguments[0],
_sqlExpressionFactory.Constant(1))
},
nullable: true,
instancePropagatesNullability: true,
argumentsPropagateNullability: new[] { false },
method.ReturnType,
_typeMappingSource.FindMapping(method.ReturnType, storeType));
}
if (Equals(method, IsWithinDistance))
{
instance = _sqlExpressionFactory.ApplyTypeMapping(
instance, _typeMappingSource.FindMapping(instance.Type, storeType));
var typeMappedArguments = new List<SqlExpression>();
foreach (var argument in arguments)
{
typeMappedArguments.Add(
_sqlExpressionFactory.ApplyTypeMapping(
argument,
typeof(Geometry).IsAssignableFrom(argument.Type)
? _typeMappingSource.FindMapping(argument.Type, storeType)
: _typeMappingSource.FindMapping(argument.Type)));
}
var finalArguments = Simplify(new[] { typeMappedArguments[0] }, isGeography);
return _sqlExpressionFactory.LessThanOrEqual(
_sqlExpressionFactory.Function(
instance,
"STDistance",
finalArguments,
nullable: true,
instancePropagatesNullability: true,
argumentsPropagateNullability: finalArguments.Select(_ => true),
typeof(double)),
typeMappedArguments[1]);
}
}
return null;
}
private IEnumerable<SqlExpression> Simplify(IEnumerable<SqlExpression> arguments, bool isGeography)
{
foreach (var argument in arguments)
{
if (argument is SqlConstantExpression constant
&& constant.Value is Geometry geometry
&& geometry.SRID == (isGeography ? 4326 : 0))
{
yield return _sqlExpressionFactory.Fragment("'" + geometry.AsText() + "'");
continue;
}
yield return argument;
}
}
}