-
Notifications
You must be signed in to change notification settings - Fork 3.1k
/
ProjectionExpression.cs
61 lines (50 loc) · 2.25 KB
/
ProjectionExpression.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
// 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;
using System.Linq.Expressions;
using Microsoft.EntityFrameworkCore.Query.Expressions.Internal;
using Microsoft.EntityFrameworkCore.Query.Internal;
namespace Microsoft.EntityFrameworkCore.Cosmos.Query.Pipeline
{
public class ProjectionExpression : Expression, IPrintable
{
public ProjectionExpression(Expression expression, string alias)
{
Expression = expression;
Alias = alias;
}
public string Alias { get; }
public Expression Expression { get; }
public override Type Type => Expression.Type;
public override ExpressionType NodeType => ExpressionType.Extension;
protected override Expression VisitChildren(ExpressionVisitor visitor)
=> Update(visitor.Visit(Expression));
public ProjectionExpression Update(Expression expression)
=> expression != Expression
? new ProjectionExpression(expression, Alias)
: this;
public void Print(ExpressionPrinter expressionPrinter)
{
expressionPrinter.Visit(Expression);
if (!string.Equals(string.Empty, Alias)
&& !string.Equals(Alias, GetName()))
{
expressionPrinter.StringBuilder.Append(" AS " + Alias);
}
}
private string GetName()
=> (Expression as KeyAccessExpression)?.Name
?? (Expression as ObjectAccessExpression)?.Name
?? (Expression as EntityProjectionExpression)?.Alias;
public override bool Equals(object obj)
=> obj != null
&& (ReferenceEquals(this, obj)
|| obj is ProjectionExpression projectionExpression
&& Equals(projectionExpression));
private bool Equals(ProjectionExpression projectionExpression)
=> string.Equals(Alias, projectionExpression.Alias)
&& Expression.Equals(projectionExpression.Expression);
public override int GetHashCode() => HashCode.Combine(base.GetHashCode(), Alias, Expression);
}
}