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QueryableSpatialBooleanMethodHandler.cs
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QueryableSpatialBooleanMethodHandler.cs
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using System.Diagnostics.CodeAnalysis;
using System.Linq.Expressions;
using System.Reflection;
using HotChocolate.Configuration;
using HotChocolate.Data.Filters.Expressions;
using HotChocolate.Internal;
using HotChocolate.Language;
using HotChocolate.Language.Visitors;
using HotChocolate.Types.Descriptors;
namespace HotChocolate.Data.Filters.Spatial
{
public abstract class QueryableSpatialBooleanMethodHandler
: FilterFieldHandler<QueryableFilterContext, Expression>
{
private readonly IExtendedType _runtimeType;
protected abstract int Operation { get; }
protected abstract bool IsTrue { get; }
protected string GeometryFieldName { get; }
protected string BufferFieldName { get; }
protected QueryableSpatialBooleanMethodHandler(
IFilterConvention convention,
ITypeInspector inspector,
MethodInfo method)
{
_runtimeType = inspector.GetReturnType(method);
GeometryFieldName = convention.GetOperationName(SpatialFilterOperations.Geometry);
BufferFieldName = convention.GetOperationName(SpatialFilterOperations.Buffer);
}
public override bool CanHandle(
ITypeCompletionContext context,
IFilterInputTypeDefinition typeDefinition,
IFilterFieldDefinition fieldDefinition) =>
fieldDefinition is FilterOperationFieldDefinition op &&
op.Id == Operation;
public override bool TryHandleEnter(
QueryableFilterContext context,
IFilterField field,
ObjectFieldNode node,
[NotNullWhen(true)] out ISyntaxVisitorAction? action)
{
if (field is IFilterOperationField filterOperationField)
{
if (node.Value.IsNull())
{
context.ReportError(
ErrorHelper.CreateNonNullError(
field, node.Value, context));
action = SyntaxVisitor.Skip;
return true;
}
if (!TryHandleOperation(
context,
filterOperationField,
node,
out Expression? nestedProperty))
{
context.ReportError(
ErrorHelper.CouldNotCreateFilterForOperation(
field, node.Value, context));
action = SyntaxVisitor.Skip;
return true;
}
context.RuntimeTypes.Push(_runtimeType);
context.PushInstance(nestedProperty );
action = SyntaxVisitor.SkipAndLeave;
}
else
{
action = SyntaxVisitor.Break;
}
return true;
}
protected abstract bool TryHandleOperation(
QueryableFilterContext context,
IFilterOperationField field,
ObjectFieldNode node,
[NotNullWhen(true)] out Expression? result);
public override bool TryHandleLeave(
QueryableFilterContext context,
IFilterField field,
ObjectFieldNode node,
[NotNullWhen(true)] out ISyntaxVisitorAction? action)
{
// Dequeue last
Expression instance = context.PopInstance();
context.RuntimeTypes.Pop();
Expression condition = IsTrue ? instance : FilterExpressionBuilder.Not(instance);
if (context.InMemory)
{
condition = FilterExpressionBuilder.NotNullAndAlso(
context.GetInstance(),
condition);
}
context.GetLevel().Enqueue(condition);
action = SyntaxVisitor.Continue;
return true;
}
}
}