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annotate Library/LibrarySystem/Core/Library.cs @ 54:cd9faa9f024b

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Working with INotifyDataErrorInfo
author Steven Hollidge <stevenhollidge@hotmail.com>
date Thu, 19 Apr 2012 13:39:22 +0100
parents aef06698d9e2
children 3591c26bd63e
rev   line source
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using LibrarySystem.Interfaces;
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5
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6 namespace LibrarySystem.Core
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7 {
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8 public class Library : ILibrary
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9 {
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10 public string Location { get; private set; }
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11 public IList<IStock> StockList { get; private set; }
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12
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13 private Library()
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14 {
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15 }
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16
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17 public static ILibrary Create(string location)
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18 {
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19 if (location == null)
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20 throw new ArgumentNullException();
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21
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22 return new Library() {Location = location, StockList = new List<IStock>(0)};
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23 }
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24
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25 public void AddStock(params IBook[] books)
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26 {
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27 if (books == null)
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28 throw new ArgumentNullException();
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29
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30 var stock = new List<IStock>(StockList.Count + books.Length);
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31
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32 stock.AddRange(StockList);
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33
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34 foreach (var book in books)
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35 {
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36 if (book == null)
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37 throw new ArgumentNullException();
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38
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39 ThrowExceptionIfBookIsAlreadyInStock(book);
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41 stock.Add(Stock.Create(book, true));
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42 }
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43
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44 StockList = stock;
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45 }
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46
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47 private void ThrowExceptionIfBookIsAlreadyInStock(IBook book)
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48 {
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49 var lookup = ((List<IStock>) StockList).Find(s => s.Book.Id == book.Id);
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50 if (lookup != null)
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51 throw new Exception(string.Format("Book id {0} is already in stock", book.Id));
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52 }
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53
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54 public bool IsBookAvailableByISBN(string isbn)
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55 {
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56 if (isbn == null)
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57 throw new ArgumentNullException();
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58
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59 var qry = from books in StockList
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60 where books.Book.ISBN == isbn
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61 & books.IsAvailable
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62 select books.IsAvailable;
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63
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64 return qry.FirstOrDefault();
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65 }
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66
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67 public IList<IStock> FindBooks(string searchString)
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68 {
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69 if (searchString == null)
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70 throw new ArgumentNullException();
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71
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72 searchString = searchString.ToLower();
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73
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74 var qry = from books in StockList
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75 where books.Book.Title.ToLower().Contains(searchString)
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76 || books.Book.Author.ToLower().Contains(searchString)
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77 select books;
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78
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79 return qry.ToList();
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80 }
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81
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82 public IBook GetBookById(string id)
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83 {
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84 if (id == null)
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85 throw new ArgumentNullException();
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86
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87 id = id.ToLower();
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88
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89 var qry = from books in StockList
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90 where books.Book.Id.ToLower() == id
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91 select books.Book;
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92
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93 return qry.FirstOrDefault();
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94 }
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96
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97 public void LendBook(IPerson person, string id)
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98 {
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99 if (person == null || id == null)
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100 throw new ArgumentNullException();
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101
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102 var stock = ThrowExceptionIfBookIsNotInStock(id);
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103 stock.IsAvailable = false;
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104
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105 // FUTURE: register with person that they have borrowed the book
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106 }
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107
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108 private IStock ThrowExceptionIfBookIsNotInStock(string id)
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109 {
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110 var lookup = ((List<IStock>) StockList).Find(s => s.Book.Id == id);
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111 if (lookup == null)
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112 throw new Exception(string.Format("Book with id {0} is not in stock", id));
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113 return lookup;
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114 }
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115 }
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116 }