131 lines
4.3 KiB
C#
131 lines
4.3 KiB
C#
using System;
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using System.Collections.Generic;
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namespace TestCode
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{
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public class CountryCollection
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{
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static List<Country> db;
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static CountryCollection()
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{
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db = new List<Country>();
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db.Add(new Country(1, "Poland", "Warsaw", 38116000.0));
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db.Add(new Country(2,"Portugal", "Lisbon", 10617575.0));
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db.Add(new Country(3,"Australia", "Canberra", 21468700.0));
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db.Add(new Country(4,"Austria", "Vienna", 8316487.0));
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db.Add(new Country(5,"Belgium", "Brussels", 10666866.0));
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db.Add(new Country(6,"Brazil", "Brasilia", 190132630.0));
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db.Add(new Country(7,"China", "Bejing", 1321000000.0));
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db.Add(new Country(8,"Chad", "N'Djamena", 10780600.0));
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db.Add(new Country(9,"Venezuela", "Caracas", 28199822.0));
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db.Add(new Country(10,"Vietnam", "Hanoi", 86116559.0));
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db.Add(new Country(11,"New Zealand", "Wellington", 4268000.0));
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db.Add(new Country(12,"Nigeria", "Abuja", 148000000.0));
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db.Add(new Country(13,"Oman", "Muscat", 2577000.0));
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db.Add(new Country(14,"Quatar", "Doha", 1450000.0));
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db.Add(new Country(15,"Denmark", "Copenhagen", 5505995.0));
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db.Add(new Country(16,"Dominican Republic", "Santo Domingo de Guzman", 9904000.0));
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db.Add(new Country(17,"France", "Paris", 64473140.0));
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db.Add(new Country(18,"United States of America", "Washington", 305619000.0));
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db.Add(new Country(19,"Latvia", "Riga", 2270700.0));
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}
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public List<Country> GetCountries(string sortExpression)
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{
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var ret = new List<Country>();
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ret.AddRange(db);
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ret.Sort(new CountryComparer(sortExpression));
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return ret;
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}
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public int Update(int id, string name, string capital, double population)
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{
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if (String.IsNullOrEmpty(name))
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return 0;
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int updated = 0;
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foreach (Country c in db)
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{
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if (c.ID != id)
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continue;
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updated++;
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c.Name = name;
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c.Capital = capital;
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c.Population = population;
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}
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return updated;
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}
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public int Insert(int id, string name, string capital, double population)
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{
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if (String.IsNullOrEmpty(name))
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return 0;
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db.Add(new Country(id, name, capital, population));
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return 1;
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}
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public int Delete(int id)
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{
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var toDelete = new List<Country> ();
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foreach (Country c in db)
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{
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if (c.ID != id)
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continue;
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toDelete.Add(c);
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}
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foreach (Country c in toDelete)
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db.Remove(c);
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return toDelete.Count;
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}
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}
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sealed class CountryComparer : IComparer<Country>
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{
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string sortProperty;
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bool descending;
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public CountryComparer(string sortExpression)
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{
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descending = sortExpression.ToLowerInvariant().EndsWith(" desc");
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if (descending)
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{
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sortProperty = sortExpression.Substring(0, sortExpression.Length - 5);
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}
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else
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{
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if (sortExpression.ToLowerInvariant().EndsWith(" asc"))
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sortProperty = sortExpression.Substring(0, sortExpression.Length - 4);
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else
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sortProperty = sortExpression;
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}
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}
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public int Compare(Country a, Country b)
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{
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int retVal = 0;
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switch (sortProperty)
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{
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case "Name":
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retVal = String.Compare(a.Name, b.Name, StringComparison.InvariantCultureIgnoreCase);
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break;
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case "Capital":
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retVal = String.Compare(a.Capital, b.Capital, StringComparison.InvariantCultureIgnoreCase);
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break;
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case "Population":
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retVal = (int)(a.Population - b.Population);
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break;
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}
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if (descending)
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return retVal;
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return retVal * -1;
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}
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}
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} |