80 lines
2.9 KiB
C#
80 lines
2.9 KiB
C#
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// Copyright (c) The Geekeey Authors
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// SPDX-License-Identifier: EUPL-1.2
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using System.Linq.Expressions;
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namespace Geekeey.Request.Persistence;
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/// <summary>
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/// Provides extension methods for <see cref="OrderedSpecificationBuilder{T}"/>.
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/// </summary>
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public static class OrderedBuilderExtensions
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{
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/// <summary>
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/// Adds a ThenBy expression for secondary ordering.
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/// </summary>
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/// <param name="builder">The ordered builder.</param>
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/// <param name="expression">The expression.</param>
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/// <typeparam name="T">The entity type.</typeparam>
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/// <returns>The ordered builder.</returns>
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public static OrderedSpecificationBuilder<T> ThenBy<T>(this OrderedSpecificationBuilder<T> builder, Expression<Func<T, object?>> expression)
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{
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return ThenBy(builder, expression, condition: true);
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}
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/// <summary>
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/// Adds a ThenBy expression when <paramref name="condition"/> is <see langword="true"/>.
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/// </summary>
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/// <param name="builder">The ordered builder.</param>
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/// <param name="expression">The expression.</param>
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/// <param name="condition">Whether to apply the ThenBy.</param>
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/// <typeparam name="T">The entity type.</typeparam>
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/// <returns>The ordered builder.</returns>
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public static OrderedSpecificationBuilder<T> ThenBy<T>(this OrderedSpecificationBuilder<T> builder, Expression<Func<T, object?>> expression, bool condition)
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{
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if (condition && !builder.IsChainDiscarded)
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{
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builder.Builder.OrderExpressions.Add(new OrderExpressionInfo<T>(expression, OrderType.ThenBy));
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}
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else
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{
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builder.IsChainDiscarded = true;
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}
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return builder;
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}
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/// <summary>
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/// Adds a ThenByDescending expression for secondary ordering.
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/// </summary>
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/// <param name="builder">The ordered builder.</param>
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/// <param name="expression">The expression.</param>
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/// <typeparam name="T">The entity type.</typeparam>
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/// <returns>The ordered builder.</returns>
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public static OrderedSpecificationBuilder<T> ThenByDescending<T>(this OrderedSpecificationBuilder<T> builder, Expression<Func<T, object?>> expression)
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{
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return ThenByDescending(builder, expression, condition: true);
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}
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/// <summary>
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/// Adds a ThenByDescending expression when <paramref name="condition"/> is <see langword="true"/>.
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/// </summary>
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/// <param name="builder">The ordered builder.</param>
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/// <param name="expression">The expression.</param>
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/// <param name="condition">Whether to apply the ThenByDescending.</param>
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/// <typeparam name="T">The entity type.</typeparam>
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/// <returns>The ordered builder.</returns>
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public static OrderedSpecificationBuilder<T> ThenByDescending<T>(this OrderedSpecificationBuilder<T> builder, Expression<Func<T, object?>> expression, bool condition)
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{
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if (condition && !builder.IsChainDiscarded)
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{
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builder.Builder.OrderExpressions.Add(new OrderExpressionInfo<T>(expression, OrderType.ThenByDescending));
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}
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else
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{
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builder.IsChainDiscarded = true;
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}
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return builder;
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}
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}
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