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1 // This file (Contain.cs) is a part of the IBBoard.NUnit project and is copyright 2010 IBBoard
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2 //
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3 // The file and the library/program it is in are licensed and distributed, without warranty, under the GNU LGPL, either version 3 of the License or (at your option) any later version. Please see COPYING for more information and the full license.
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4 using System;
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5 using NUnit.Framework.Constraints;
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6 using NUnit.Framework;
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7 namespace IBBoard.NUnit.Constraints
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8 {
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9 /// <summary>
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10 /// Requires a list of objects to appear in a given order from the start of an array
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11 /// </summary>
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12 public class ArrayContainsConstraint<T> : Constraint
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13 {
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14 private static readonly int NOT_FOUND = -1;
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15 private T[] containedObjs;
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16 private int idx = NOT_FOUND;
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17
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18 public ArrayContainsConstraint(params T[] containedObjects)
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19 {
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20 containedObjs = containedObjects;
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21 }
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22
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23 public override bool Matches(object actual)
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24 {
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25 this.actual = actual;
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26
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27 if (!(actual is Array))
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28 {
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29 throw new ArgumentException("The actual value must be an array");
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30 }
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31
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32 return DoMatch((object[])this.actual);
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33 }
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34
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35 private bool DoMatch(object[] array)
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36 {
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37 bool isMatch = true;
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38 idx = NOT_FOUND;
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39
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40 if (containedObjs.Length != array.Length)
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41 {
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42 isMatch = false;
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43 }
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44 else
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45 {
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46 for (int i = 0; i < containedObjs.Length; i++)
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47 {
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48 if (!EqualityChecker.AreEqual(containedObjs[i], array[i]))
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49 {
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50 isMatch = false;
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51 idx = i;
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52 break;
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53 }
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54 }
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55 }
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56
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57 return isMatch;
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58 }
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59
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60 public override void WriteDescriptionTo(MessageWriter writer)
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61 {
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62 if (containedObjs.Length == 0)
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63 {
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64 writer.Write("Empty array");
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65 }
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66 else if (idx == NOT_FOUND)
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67 {
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68 writer.WriteExpectedValue(containedObjs[0]);
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69 }
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70 else
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71 {
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72 writer.WriteExpectedValue(containedObjs[idx]);
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73 }
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74 }
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75
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76 public override void WriteActualValueTo(MessageWriter writer)
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77 {
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78 object[] actualArray = ((object[])actual);
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79
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80 if (actualArray.Length == 0)
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81 {
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82 writer.Write("Empty array");
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83 }
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84 else if (idx == NOT_FOUND)
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85 {
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86 writer.WriteActualValue(actualArray[0]);
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87 }
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88 else
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89 {
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90 writer.WriteActualValue(actualArray[idx]);
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91 }
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92 }
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93
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94 public override void WriteMessageTo(MessageWriter writer)
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95 {
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96 base.WriteMessageTo(writer);
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97
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98 if (idx != NOT_FOUND)
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99 {
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100 writer.WriteMessageLine("Incorrect value at {0}", idx);
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101 }
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102 }
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103 }
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104 }
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105
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