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1 using System;
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2 using System.Collections.Generic;
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3
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4 using NUnit.Framework;
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5
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6 using BLToolkit.Data;
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7 using BLToolkit.Mapping;
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8 using BLToolkit.Reflection;
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9
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10 namespace HowTo.Reflection
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11 {
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12 [TestFixture]
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13 public class ObjectFactoryTest
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14 {
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15 /*[a]*/[ObjectFactory(typeof(Person.ObjectFactory))]/*[/a]*/
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16 public class Person
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17 {
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18 [MapField("PersonID")]
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19 public int ID;
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20
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21 public string LastName;
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22 public string FirstName;
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23 public string MiddleName;
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24
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25 /*[a]*/class ObjectFactory : IObjectFactory/*[/a]*/
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26 {
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27 public object /*[a]*/CreateInstance(TypeAccessor typeAccessor, InitContext context)/*[/a]*/
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28 {
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29 // Get the object type indicator field.
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30 //
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31 object objectType = context.DataSource.GetValue(context.SourceObject, "PersonType");
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32
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33 // Target ObjectMapper must be changed in order to provide correct mapping.
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34 //
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35 switch ((string)objectType)
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36 {
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37 case "D": /*[a]*/context.ObjectMapper = ObjectMapper<Doctor>. Instance;/*[/a]*/ break;
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38 case "P": /*[a]*/context.ObjectMapper = ObjectMapper<Patient>.Instance;/*[/a]*/ break;
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39 }
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40
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41 // Create an object instance.
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42 // Do not call ObjectMapper.CreateInstance as it will lead to infinite recursion.
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43 //
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44 return context.ObjectMapper./*[a]*/TypeAccessor/*[/a]*/.CreateInstance(context);
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45 }
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46 }
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47 }
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48
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49 public class /*[a]*/Doctor : Person/*[/a]*/
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50 {
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51 public string Taxonomy;
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52 }
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53
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54 public class /*[a]*/Patient : Person/*[/a]*/
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55 {
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56 public string Diagnosis;
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57 }
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58
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59 [Test]
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60 public void Test()
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61 {
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62 using (DbManager db = new DbManager())
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63 {
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64 List<Person> list = db
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65 .SetCommand(@"
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66 SELECT
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67 ps.*,
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68 d.Taxonomy,
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69 p.Diagnosis,
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70 CASE
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71 WHEN d.PersonID IS NOT NULL THEN 'D'
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72 WHEN p.PersonID IS NOT NULL THEN 'P'
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73 END as PersonType
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74 FROM
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75 Person ps
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76 LEFT JOIN Doctor d ON d.PersonID = ps.PersonID
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77 LEFT JOIN Patient p ON p.PersonID = ps.PersonID
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78 ORDER BY
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79 ps.PersonID")
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80 .ExecuteList<Person>();
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81
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82 Assert.AreEqual(list[0].GetType(), /*[a]*/typeof(Doctor)/*[/a]*/);
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83 Assert.AreEqual(list[1].GetType(), /*[a]*/typeof(Patient)/*[/a]*/);
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84
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85 if (list.Count > 2)
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86 Assert.AreEqual(list[2].GetType(), typeof(Person));
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87 }
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88 }
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89 }
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90 }
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