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ObjectAccessExpression.cs
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ObjectAccessExpression.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Linq.Expressions;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Query.Internal;
namespace Microsoft.EntityFrameworkCore.Cosmos.Query.Pipeline
{
public class ObjectAccessExpression : SqlExpression
{
private readonly Expression _outerExpression;
public ObjectAccessExpression(INavigation navigation, Expression outerExpression)
: base(navigation.ClrType, null)
{
Name = navigation.GetTargetType().GetCosmosContainingPropertyName();
if (Name == null)
{
throw new InvalidOperationException(
$"Navigation '{navigation.DeclaringEntityType.DisplayName()}.{navigation.Name}' doesn't point to a nested entity.");
}
Navigation = navigation;
_outerExpression = outerExpression;
}
public string Name { get; }
public INavigation Navigation { get; }
protected override Expression VisitChildren(ExpressionVisitor visitor)
{
var outerExpression = visitor.Visit(_outerExpression);
return Update(outerExpression);
}
public ObjectAccessExpression Update(Expression outerExpression)
=> outerExpression != _outerExpression
? new ObjectAccessExpression(Navigation, outerExpression)
: this;
public override void Print(ExpressionPrinter expressionPrinter) => expressionPrinter.StringBuilder.Append(ToString());
public override string ToString() => $"{_outerExpression}[\"{Name}\"]";
public override bool Equals(object obj)
=> obj != null
&& (ReferenceEquals(this, obj)
|| obj is ObjectAccessExpression objectAccessExpression
&& Equals(objectAccessExpression));
private bool Equals(ObjectAccessExpression objectAccessExpression)
=> base.Equals(objectAccessExpression)
&& string.Equals(Name, objectAccessExpression.Name)
&& _outerExpression.Equals(objectAccessExpression._outerExpression);
public override int GetHashCode() => HashCode.Combine(base.GetHashCode(), Name, _outerExpression);
}
}