86 lines
2.3 KiB
C#
86 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Data.SqlTypes;
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using System.Linq;
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using System.Text;
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namespace Books.Console
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{
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public static class SearchByAuthor
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{
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public static IEnumerable<string> MatchBy(
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IEnumerable<Book> books, string searchCriteria)
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{
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return books
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.ExtractAuthors()
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.ListAuthorsMatching(searchCriteria);
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}
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public static IEnumerable<string> SuggestAuthors(
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IEnumerable<Book> books, int suggestionLength = 5)
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{
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return books
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.ExtractAuthors()
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.RandomizeOrder()
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.Take(suggestionLength);
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}
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public static IEnumerable<Book> ListBooks(IEnumerable<Book> books, string author)
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{
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return books
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.CatalogueByAuthor()
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.BooksBy(author);
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}
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public static AuthorCatalogue CatalogueByAuthor(this IEnumerable<Book> books)
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{
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return books
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.ToLookup(b => b.author)
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// Mark Twain : {The Adventures of Huckleberry Finn},
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// Shakespeare: {Othello, Hamlet, ...}
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// ...
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;
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}
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public static IEnumerable<Book> BooksBy(this AuthorCatalogue catalogue, string author)
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{
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return catalogue.Contains(author)
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? catalogue[author]
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: Enumerable.Empty<Book>();
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}
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public static IEnumerable<string> ExtractAuthors(this IEnumerable<Book> books)
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{
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return books.Select(b =>
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{
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//do stuff here
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return b.author;
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}).Distinct();
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}
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public static IEnumerable<string> ListAuthorsMatching(
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this IEnumerable<string> authors, string searchCriteria)
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{
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var partOfNameLower = searchCriteria.ToLower();
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return authors.Where(a => a.ToLower().Contains(partOfNameLower));
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}
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private static IOrderedEnumerable<string> RandomizeOrder(this IEnumerable<string> authors)
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{
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return authors.OrderBy(_ => Guid.NewGuid());
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}
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}
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public class AuthorCatalogue
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{
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}
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public class Book
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{
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}
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}
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