| | | 1 | | using Fluorite.Strainer.Models; |
| | | 2 | | using Fluorite.Strainer.Services.Pagination; |
| | | 3 | | |
| | | 4 | | namespace Fluorite.Strainer.Services.Pipelines; |
| | | 5 | | |
| | | 6 | | public class PaginatePipelineOperation : IPaginatePipelineOperation, IStrainerPipelineOperation |
| | | 7 | | { |
| | | 8 | | private readonly IPageNumberEvaluator _pageNumberEvaluator; |
| | | 9 | | private readonly IPageSizeEvaluator _pageSizeEvaluator; |
| | | 10 | | |
| | 5 | 11 | | public PaginatePipelineOperation( |
| | 5 | 12 | | IPageNumberEvaluator pageNumberEvaluator, |
| | 5 | 13 | | IPageSizeEvaluator pageSizeEvaluator) |
| | | 14 | | { |
| | 5 | 15 | | _pageNumberEvaluator = Guard.Against.Null(pageNumberEvaluator); |
| | 5 | 16 | | _pageSizeEvaluator = Guard.Against.Null(pageSizeEvaluator); |
| | 5 | 17 | | } |
| | | 18 | | |
| | | 19 | | public IQueryable<T> Execute<T>(IStrainerModel model, IQueryable<T> source) |
| | | 20 | | { |
| | 4 | 21 | | Guard.Against.Null(model); |
| | 3 | 22 | | Guard.Against.Null(source); |
| | | 23 | | |
| | 2 | 24 | | var page = _pageNumberEvaluator.Evaluate(model); |
| | 2 | 25 | | var pageSize = _pageSizeEvaluator.Evaluate(model); |
| | | 26 | | |
| | 2 | 27 | | if (page > 1) |
| | | 28 | | { |
| | 1 | 29 | | source = source.Skip((page - 1) * pageSize); |
| | | 30 | | } |
| | | 31 | | |
| | 2 | 32 | | if (pageSize > 0) |
| | | 33 | | { |
| | 1 | 34 | | source = source.Take(pageSize); |
| | | 35 | | } |
| | | 36 | | |
| | 2 | 37 | | return source; |
| | | 38 | | } |
| | | 39 | | } |