| | | 1 | | // ----------------------------------------------------------------------- |
| | | 2 | | // <copyright file="FiltersViewModelBuilder.cs" company="Stéphane ANDRE"> |
| | | 3 | | // Copyright (c) Stéphane ANDRE. All rights reserved. |
| | | 4 | | // </copyright> |
| | | 5 | | // ----------------------------------------------------------------------- |
| | | 6 | | |
| | | 7 | | using System; |
| | | 8 | | using System.Linq.Expressions; |
| | | 9 | | using MyNet.Primitives; |
| | | 10 | | using MyNet.UI.ViewModels.List.Filtering.Filters; |
| | | 11 | | |
| | | 12 | | namespace MyNet.UI.ViewModels.List.Filtering; |
| | | 13 | | |
| | | 14 | | /// <summary> |
| | | 15 | | /// Fluent builder used to create <see cref="FiltersViewModel{T}"/> instances. |
| | | 16 | | /// </summary> |
| | | 17 | | /// <typeparam name="T">The type of items to filter.</typeparam> |
| | | 18 | | public sealed class FiltersViewModelBuilder<T> |
| | | 19 | | { |
| | | 20 | | private readonly FilterGroupViewModel<T> _group; |
| | | 21 | | |
| | | 22 | | /// <summary> |
| | | 23 | | /// Initializes a new instance of the <see cref="FiltersViewModelBuilder{T}"/> class with an empty root group. |
| | | 24 | | /// </summary> |
| | | 25 | | public FiltersViewModelBuilder() |
| | 3 | 26 | | : this(new()) |
| | | 27 | | { |
| | 3 | 28 | | } |
| | | 29 | | |
| | 6 | 30 | | private FiltersViewModelBuilder(FilterGroupViewModel<T> group) => _group = group; |
| | | 31 | | |
| | | 32 | | /// <summary> |
| | | 33 | | /// Creates and immediately builds a filters view model from a configuration action. |
| | | 34 | | /// </summary> |
| | | 35 | | public static FiltersViewModel<T> Create(Action<FiltersViewModelBuilder<T>> configure) |
| | | 36 | | { |
| | 3 | 37 | | ArgumentNullException.ThrowIfNull(configure); |
| | | 38 | | |
| | 3 | 39 | | var builder = new FiltersViewModelBuilder<T>(); |
| | 3 | 40 | | configure(builder); |
| | 3 | 41 | | return builder.Build(); |
| | | 42 | | } |
| | | 43 | | |
| | | 44 | | /// <summary> |
| | | 45 | | /// Adds a child group combined with <see cref="LogicalOperator.Or"/>. |
| | | 46 | | /// </summary> |
| | | 47 | | public FiltersViewModelBuilder<T> OrGroup(Action<FiltersViewModelBuilder<T>> configure) => |
| | 3 | 48 | | AddGroup(LogicalOperator.Or, configure); |
| | | 49 | | |
| | | 50 | | /// <summary> |
| | | 51 | | /// Adds a child group combined with <see cref="LogicalOperator.And"/>. |
| | | 52 | | /// </summary> |
| | | 53 | | public FiltersViewModelBuilder<T> AndGroup(Action<FiltersViewModelBuilder<T>> configure) => |
| | 0 | 54 | | AddGroup(LogicalOperator.And, configure); |
| | | 55 | | |
| | | 56 | | /// <summary> |
| | | 57 | | /// Adds a string filter to the current group. |
| | | 58 | | /// </summary> |
| | | 59 | | public FiltersViewModelBuilder<T> AddStringFilter( |
| | | 60 | | string propertyName, |
| | | 61 | | Expression<Func<T, string?>> property, |
| | | 62 | | Action<StringFilterViewModel<T>>? configure = null) |
| | | 63 | | { |
| | 6 | 64 | | ArgumentNullException.ThrowIfNull(propertyName); |
| | 6 | 65 | | ArgumentNullException.ThrowIfNull(property); |
| | | 66 | | |
| | 6 | 67 | | var filter = new StringFilterViewModel<T>(propertyName, property); |
| | 6 | 68 | | configure?.Invoke(filter); |
| | 6 | 69 | | _group.Add(filter); |
| | 6 | 70 | | return this; |
| | | 71 | | } |
| | | 72 | | |
| | | 73 | | /// <summary> |
| | | 74 | | /// Creates the configured <see cref="FiltersViewModel{T}"/>. |
| | | 75 | | /// </summary> |
| | 3 | 76 | | public FiltersViewModel<T> Build() => new(_group); |
| | | 77 | | |
| | | 78 | | private FiltersViewModelBuilder<T> AddGroup(LogicalOperator logicalOperator, Action<FiltersViewModelBuilder<T>> conf |
| | | 79 | | { |
| | 3 | 80 | | ArgumentNullException.ThrowIfNull(configure); |
| | | 81 | | |
| | 3 | 82 | | var group = new FilterGroupViewModel<T> { Operator = logicalOperator }; |
| | 3 | 83 | | configure(new(group)); |
| | 3 | 84 | | _group.Add(group); |
| | 3 | 85 | | return this; |
| | | 86 | | } |
| | | 87 | | } |
| | | 88 | | |