| using System.Collections.Generic; |
| using System.Diagnostics.CodeAnalysis; |
| |
| namespace Lucene.Net.Index |
| { |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| /// <summary> |
| /// Represents an <see cref="IndexOptions"/> comparison operation that uses <see cref="int"/> comparison rules. |
| /// <para/> |
| /// Since in .NET the standard comparers will do boxing when comparing enum types, |
| /// this class was created as a more performant alternative than calling <c>CompareTo()</c> on <see cref="IndexOptions"/>. |
| /// </summary> |
| // See: GH-376 |
| public sealed class IndexOptionsComparer : IComparer<IndexOptions> |
| { |
| private IndexOptionsComparer() { } // No instance |
| |
| /// <summary> |
| /// Gets the default static singleton instance of <see cref="IndexOptionsComparer"/>. |
| /// </summary> |
| public static IComparer<IndexOptions> Default { get; } = new IndexOptionsComparer(); |
| |
| /// <summary> |
| /// Compares two <see cref="IndexOptions"/> enums and returns an indication of their relative sort order. |
| /// </summary> |
| /// <param name="x">An <see cref="IndexOptions"/> enum to compare to <paramref name="y"/>.</param> |
| /// <param name="y">An <see cref="IndexOptions"/> enum to compare to <paramref name="x"/>.</param> |
| /// <returns> |
| /// A signed integer that indicates the relative values of <paramref name="x"/> and <paramref name="y"/>, as shown in the following table. |
| /// <list type="table"> |
| /// <listheader> |
| /// <term>Value</term> |
| /// <term>Meaning</term> |
| /// </listheader> |
| /// <item> |
| /// <term>Less than zero </term> |
| /// <term><paramref name="x"/> precedes y in the sort order.</term> |
| /// </item> |
| /// <item> |
| /// <term>Zero </term> |
| /// <term><paramref name="x"/> is equal to <paramref name="y"/>.</term> |
| /// </item> |
| /// <item> |
| /// <term>Greater than zero </term> |
| /// <term><paramref name="x"/> follows <paramref name="y"/> in the sort order.</term> |
| /// </item> |
| /// </list> |
| /// </returns> |
| public int Compare([DisallowNull] IndexOptions x, [DisallowNull] IndexOptions y) |
| { |
| return ((int)x).CompareTo((int)y); |
| } |
| } |
| } |