forked from mongodb/mongo-csharp-driver
/
BsonValueEquivalencyComparer.cs
131 lines (117 loc) · 3.98 KB
/
BsonValueEquivalencyComparer.cs
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/* Copyright 2015-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Collections.Generic;
namespace MongoDB.Bson.TestHelpers
{
public class BsonValueEquivalencyComparer : IEqualityComparer<BsonValue>
{
#region static
public static BsonValueEquivalencyComparer Instance { get; } = new BsonValueEquivalencyComparer();
public static bool Compare(BsonValue a, BsonValue b, Action<BsonValue, BsonValue> massageAction = null)
{
massageAction?.Invoke(a, b);
if (a.BsonType == BsonType.Document && b.BsonType == BsonType.Document)
{
return CompareDocuments((BsonDocument)a, (BsonDocument)b, massageAction);
}
else if (a.BsonType == BsonType.Array && b.BsonType == BsonType.Array)
{
return CompareArrays((BsonArray)a, (BsonArray)b, massageAction);
}
else if (a.BsonType == b.BsonType)
{
return a.Equals(b);
}
else if (IsNumber(a) && IsNumber(b))
{
return a.ToDouble() == b.ToDouble();
}
else if (CouldBeBoolean(a) && CouldBeBoolean(b))
{
return a.ToBoolean() == b.ToBoolean();
}
else
{
return false;
}
}
private static bool CompareArrays(BsonArray a, BsonArray b, Action<BsonValue, BsonValue> massageAction = null)
{
if (a.Count != b.Count)
{
return false;
}
for (var i = 0; i < a.Count; i++)
{
if (!Compare(a[i], b[i], massageAction))
{
return false;
}
}
return true;
}
private static bool CompareDocuments(BsonDocument a, BsonDocument b, Action<BsonValue, BsonValue> massageAction = null)
{
if (a.ElementCount != b.ElementCount)
{
return false;
}
foreach (var aElement in a)
{
BsonElement bElement;
if (!b.TryGetElement(aElement.Name, out bElement))
{
return false;
}
if (!Compare(aElement.Value, bElement.Value, massageAction))
{
return false;
}
}
return true;
}
private static bool CouldBeBoolean(BsonValue value)
{
switch (value.BsonType)
{
case BsonType.Boolean:
return true;
case BsonType.Double:
case BsonType.Int32:
case BsonType.Int64:
var numericValue = value.ToDouble();
return numericValue == 0.0 || numericValue == 1.0;
default:
return false;
}
}
private static bool IsNumber(BsonValue value)
{
switch (value.BsonType)
{
case BsonType.Double:
case BsonType.Int32:
case BsonType.Int64:
return true;
default:
return false;
}
}
#endregion
public bool Equals(BsonValue x, BsonValue y) => Compare(x, y);
public int GetHashCode(BsonValue obj) => obj.GetHashCode();
}
}