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IndexNameHelper.cs
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IndexNameHelper.cs
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/* Copyright 2013-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.Text;
using MongoDB.Bson;
using MongoDB.Driver.Core.Misc;
namespace MongoDB.Driver.Core.Operations
{
/// <summary>
/// Represents helper methods for index names.
/// </summary>
public static class IndexNameHelper
{
// static methods
/// <summary>
/// Gets the name of the index derived from the keys specification.
/// </summary>
/// <param name="keys">The keys specification.</param>
/// <returns>The name of the index.</returns>
public static string GetIndexName(BsonDocument keys)
{
Ensure.IsNotNull(keys, nameof(keys));
var sb = new StringBuilder();
foreach (var element in keys)
{
var value = element.Value;
string direction;
switch (value.BsonType)
{
case BsonType.Double:
case BsonType.Int32:
case BsonType.Int64:
direction = value.ToInt32().ToString();
break;
case BsonType.String:
direction = value.ToString().Replace(' ', '_');
break;
default:
direction = "x";
break;
}
if (sb.Length > 0)
{
sb.Append("_");
}
sb.Append(element.Name.Replace(' ', '_'));
sb.Append("_");
sb.Append(direction);
}
return sb.ToString();
}
/// <summary>
/// Gets the name of the index derived from the key names.
/// </summary>
/// <param name="keyNames">The key names.</param>
/// <returns>The name of the index.</returns>
public static string GetIndexName(string[] keyNames)
{
Ensure.IsNotNull(keyNames, nameof(keyNames));
var sb = new StringBuilder();
foreach (var name in keyNames)
{
if (sb.Length > 0)
{
sb.Append("_");
}
sb.Append(name.Replace(' ', '_'));
sb.Append("_1");
}
return sb.ToString();
}
}
}