Exemplo n.º 1
0
        protected NBiConstraint InstantiateConstraint()
        {
            RowCountConstraint ctr;
            var childConstraint = BuildChildConstraint(ConstraintXml.Comparer);

            IResultSetFilter filter = null;

            if (ConstraintXml.Filter != null)
            {
                var filterXml   = ConstraintXml.Filter;
                var expressions = new List <IColumnExpression>();
                if (filterXml.Expression != null)
                {
                    expressions.Add(filterXml.Expression);
                }

                var value = EvaluatePotentialVariable(ConstraintXml.Comparer.Value.Replace(" ", ""));

                var factory = new PredicateFilterFactory();
                if (filterXml.Predication != null)
                {
                    filter = factory.Instantiate
                             (
                        filterXml.Aliases
                        , expressions
                        , filterXml.Predication
                             );
                }
                else if (filterXml.Combination != null)
                {
                    filter = factory.Instantiate
                             (
                        filterXml.Aliases
                        , expressions
                        , filterXml.Combination.Operator
                        , filterXml.Combination.Predicates
                             );
                }
                if ((value is string& (value as string).EndsWith("%")))
                {
                    ctr = new RowCountFilterPercentageConstraint(childConstraint, filter);
                }
                else
                {
                    ctr = new RowCountFilterConstraint(childConstraint, filter);
                }
            }
            else
            {
                ctr = new RowCountConstraint(childConstraint);
            }

            return(ctr);
        }
Exemplo n.º 2
0
        protected BasePredicateFilter InstantiateFilter()
        {
            var expressions = new List <IColumnExpression>();

            if (ConstraintXml.Expression != null)
            {
                expressions.Add(ConstraintXml.Expression);
            }

            var factory = new PredicateFilterFactory();

            if (ConstraintXml.Predication != null)
            {
                if (ConstraintXml.Predication.Reference != null)
                {
                    ConstraintXml.Predication.Reference = EvaluatePotentialVariable(ConstraintXml.Predication.Reference);
                }


                return(factory.Instantiate
                       (
                           ConstraintXml.Aliases
                           , expressions
                           , ConstraintXml.Predication
                       ));
            }
            else if (ConstraintXml.Combination != null)
            {
                var predicateInfos = new List <IPredicateInfo>();
                foreach (var predicateXml in ConstraintXml.Combination.Predicates)
                {
                    if (predicateXml.Reference != null)
                    {
                        predicateXml.Reference = EvaluatePotentialVariable(predicateXml.Reference);
                    }

                    predicateInfos.Add(predicateXml);
                }

                return(factory.Instantiate
                       (
                           ConstraintXml.Aliases
                           , expressions
                           , ConstraintXml.Combination.Operator
                           , predicateInfos
                       ));
            }
            else
            {
                throw new ArgumentException("You must specify a predicate or a combination of predicates. None of them is specified");
            }
        }
Exemplo n.º 3
0
        public void Apply_ColumnIndex_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    "(null)", 10, 100
                },
                new List <object>()
                {
                    "(empty)", 2, 75
                },
                new List <object>()
                {
                    "C", 5, 50
                }
            }));
            var rs = service.Execute();

            var predicate = new Mock <IPredicateInfo>();

            predicate.SetupGet(p => p.ColumnType).Returns(ColumnType.Text);
            predicate.SetupGet(p => p.ComparerType).Returns(ComparerType.NullOrEmpty);
            predicate.SetupGet(p => p.Operand).Returns("#0");

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(new IColumnAlias[0], new IColumnExpression[0], predicate.Object);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
            Assert.That(filter.Describe(), Is.StringContaining("null").And.StringContaining("or empty"));
        }
Exemplo n.º 4
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        public void Matches_AllValidatePredicate_False()
        {
            var rs = new ResultSet();

            rs.Load(new[] { new object[] { "a", -1 }, new object[] { "b", -2 }, new object[] { "c", -3 } });

            var predicate = new Mock <IPredicateInfo>();

            predicate.SetupGet(p => p.ColumnType).Returns(ColumnType.Numeric);
            predicate.SetupGet(p => p.ComparerType).Returns(ComparerType.LessThan);
            predicate.SetupGet(p => p.Operand).Returns("#1");
            predicate.As <IReferencePredicateInfo>().SetupGet(p => p.Reference).Returns((object)0);

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate
                          (
                new List <IColumnAlias>()
                , new List <IColumnExpression>()
                , predicate.Object
                          );

            var singleRowCtr = new SingleRowConstraint(filter);

            Assert.That(singleRowCtr.Matches(rs), Is.False);
        }
Exemplo n.º 5
0
        protected NBiConstraint InstantiateConstraint()
        {
            AllRowsConstraint ctr;

            var expressions = new List <IColumnExpression>();

            if (ConstraintXml.Expression != null)
            {
                expressions.Add(ConstraintXml.Expression);
            }

            if (ConstraintXml.Predicate.Reference != null)
            {
                ConstraintXml.Predicate.Reference = EvaluatePotentialVariable(ConstraintXml.Predicate.Reference);
            }

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate
                          (
                ConstraintXml.Aliases
                , expressions
                , ConstraintXml.Predicate
                          );

            ctr = new AllRowsConstraint(filter);
            return(ctr);
        }
Exemplo n.º 6
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        public void Apply_ColumnName_CorrectResult()
        {
            var builder = new ResultSetBuilder();
            var rs      = builder.Build(new object[]
            {
                new List <object>()
                {
                    "(null)", 10, 100
                },
                new List <object>()
                {
                    "(empty)", 2, 75
                },
                new List <object>()
                {
                    "C", 5, 50
                }
            });

            rs.Table.Columns[0].ColumnName = "first";

            var info = Mock.Of <IPredicateInfo>
                       (
                p => p.ComparerType == ComparerType.NullOrEmpty &&
                p.ColumnType == ColumnType.Text &&
                p.Name == "first"
                       );

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(new IColumnAlias[0], new IColumnExpression[0], info);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
        }
Exemplo n.º 7
0
        public void Apply_ColumnIndex_CorrectResult()
        {
            var builder = new ResultSetBuilder();
            var rs      = builder.Build(new object[]
            {
                new List <object>()
                {
                    "(null)", 10, 100
                },
                new List <object>()
                {
                    "(empty)", 2, 75
                },
                new List <object>()
                {
                    "C", 5, 50
                }
            });

            var info = Mock.Of <IPredicateInfo>
                       (
                p => p.ComparerType == ComparerType.NullOrEmpty &&
                p.ColumnType == ColumnType.Text &&
                p.Name == "#0"
                       );

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(new IColumnAlias[0], new IColumnExpression[0], info);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
            Assert.That(filter.Describe(), Is.StringContaining("null").And.StringContaining("or empty"));
        }
Exemplo n.º 8
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        public void Matches_AllValidatePredicate_False()
        {
            var rs = new ResultSet();

            rs.Load(new[] { new object[] { "a", -1 }, new object[] { "b", -2 }, new object[] { "c", -3 } });

            var predicate = Mock.Of <IPredicateInfo>
                            (
                p => p.ColumnType == ColumnType.Numeric &&
                p.ComparerType == ComparerType.LessThan &&
                p.Operand == "#1" &&
                p.Reference == (object)0
                            );

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate
                          (
                new List <IColumnAlias>()
                , new List <IColumnExpression>()
                , predicate
                          );

            var singleRowCtr = new SingleRowConstraint(filter);

            Assert.That(singleRowCtr.Matches(rs), Is.False);
        }
Exemplo n.º 9
0
        public void Apply_ColumnName_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    "(null)", 10, 100
                },
                new List <object>()
                {
                    "(empty)", 2, 75
                },
                new List <object>()
                {
                    "C", 5, 50
                }
            }));
            var rs = service.Execute();

            rs.Table.Columns[0].ColumnName = "first";

            var predicate = new Mock <IPredicateInfo>();

            predicate.SetupGet(p => p.ColumnType).Returns(ColumnType.Text);
            predicate.SetupGet(p => p.ComparerType).Returns(ComparerType.NullOrEmpty);
            predicate.SetupGet(p => p.Operand).Returns("first");

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(new IColumnAlias[0], new IColumnExpression[0], predicate.Object);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
        }
Exemplo n.º 10
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        private IEnumerable <Alter> InstantiateAlterations(ResultSetSystemXml resultSetXml)
        {
            if (resultSetXml.Alteration == null)
            {
                yield break;
            }

            if (resultSetXml.Alteration.Filters != null)
            {
                foreach (var filterXml in resultSetXml.Alteration.Filters)
                {
                    var expressions = new List <IColumnExpression>();
                    if (filterXml.Expression != null)
                    {
                        expressions.Add(filterXml.Expression);
                    }

                    var factory = new PredicateFilterFactory();
                    if (filterXml.Predication != null)
                    {
                        yield return(factory.Instantiate
                                     (
                                         filterXml.Aliases
                                         , expressions
                                         , filterXml.Predication
                                     ).Apply);
                    }
                    if (filterXml.Combination != null)
                    {
                        yield return(factory.Instantiate
                                     (
                                         filterXml.Aliases
                                         , expressions
                                         , filterXml.Combination.Operator
                                         , filterXml.Combination.Predicates
                                     ).Apply);
                    }
                }
            }
        }
Exemplo n.º 11
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        public void Apply_AndWillNotEvaluateAll_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    null
                },
                new List <object>()
                {
                    5
                },
                new List <object>()
                {
                    10
                },
                new List <object>()
                {
                    null
                },
                new List <object>()
                {
                    20
                },
            }));

            var rs = service.Execute();

            var aliases = new[] { Mock.Of <IColumnAlias>(v => v.Column == 0 && v.Name == "a") };

            var predicate1 = new Mock <IPredicateInfo>();

            predicate1.SetupGet(p => p.ColumnType).Returns(ColumnType.Numeric);
            predicate1.SetupGet(p => p.ComparerType).Returns(ComparerType.Null);
            predicate1.SetupGet(p => p.Not).Returns(true);
            predicate1.SetupGet(p => p.Operand).Returns("#0");

            var predicate2 = new Mock <IPredicateInfo>();

            predicate2.SetupGet(p => p.ColumnType).Returns(ColumnType.Numeric);
            predicate2.SetupGet(p => p.ComparerType).Returns(ComparerType.LessThan);
            predicate2.SetupGet(p => p.Operand).Returns("#0");
            predicate2.As <IReferencePredicateInfo>().SetupGet(p => p.Reference).Returns(10);

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(aliases, new IColumnExpression[0], CombinationOperator.And, new[] { predicate1.Object, predicate2.Object });
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(1));
        }
Exemplo n.º 12
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        public void Apply_XOr_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    "(null)", 10, 100
                },
                new List <object>()
                {
                    "(empty)", 2, 75
                },
                new List <object>()
                {
                    "(empty)", 20, 75
                },
                new List <object>()
                {
                    "C", 5, 50
                },
                new List <object>()
                {
                    "C", 15, 50
                }
            }));

            var rs = service.Execute();

            var aliases = new[] { Mock.Of <IColumnAlias>(v => v.Column == 0 && v.Name == "a") };

            var predicate1 = new Mock <IPredicateInfo>();

            predicate1.SetupGet(p => p.ColumnType).Returns(ColumnType.Text);
            predicate1.SetupGet(p => p.ComparerType).Returns(ComparerType.NullOrEmpty);
            predicate1.SetupGet(p => p.Operand).Returns("a");

            var predicate2 = new Mock <IPredicateInfo>();

            predicate2.SetupGet(p => p.ColumnType).Returns(ColumnType.Numeric);
            predicate2.SetupGet(p => p.ComparerType).Returns(ComparerType.LessThan);
            predicate2.SetupGet(p => p.Operand).Returns("#1");
            predicate2.As <IReferencePredicateInfo>().SetupGet(p => p.Reference).Returns((object)10);

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(aliases, new IColumnExpression[0], CombinationOperator.XOr, new[] { predicate1.Object, predicate2.Object });
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(3));
        }
Exemplo n.º 13
0
        public void Apply_Or_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    "(null)", 10, 100
                },
                new List <object>()
                {
                    "(empty)", 2, 75
                },
                new List <object>()
                {
                    "(empty)", 20, 75
                },
                new List <object>()
                {
                    "C", 5, 50
                },
                new List <object>()
                {
                    "C", 15, 50
                }
            }));

            var rs = service.Execute();

            var aliases = new[] { Mock.Of <IColumnAlias>(v => v.Column == 0 && v.Name == "a") };

            var info1 = Mock.Of <IPredicateInfo>
                        (
                p => p.ComparerType == ComparerType.NullOrEmpty &&
                p.ColumnType == ColumnType.Text &&
                p.Operand == "a"
                        );
            var info2 = Mock.Of <IPredicateInfo>
                        (
                p => p.ComparerType == ComparerType.LessThan &&
                p.ColumnType == ColumnType.Numeric &&
                p.Operand == "#1" &&
                p.Reference == (object)10
                        );
            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(aliases, new IColumnExpression[0], CombinationOperator.Or, new[] { info1, info2 });
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(4));
        }
Exemplo n.º 14
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        public void Apply_MixedExpression_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    1, 10, 100
                },
                new List <object>()
                {
                    2, 2, 75
                },
                new List <object>()
                {
                    3, 5, 50
                }
            }));
            var rs = service.Execute();

            rs.Table.Columns[2].ColumnName = "c1";

            var aliases = new List <IColumnAlias>()
            {
                Mock.Of <IColumnAlias>(v => v.Column == 0 && v.Name == "a"),
            };

            var expressions = new List <IColumnExpression>()
            {
                Mock.Of <IColumnExpression>(e => e.Value == "Abs([a])+[e]" && e.Name == "d"),
                Mock.Of <IColumnExpression>(e => e.Value == "[#1]*[c1]" && e.Name == "e")
            };

            var info = Mock.Of <IPredicateInfo>
                       (
                p => p.ComparerType == ComparerType.MoreThanOrEqual &&
                p.ColumnType == ColumnType.Numeric &&
                p.Operand == "d" &&
                p.Reference == (object)200
                       );

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(aliases, expressions, info);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
        }
Exemplo n.º 15
0
        public void Matches_SqlCommand_CallToResultSetBuilderOnce()
        {
            var resultSet = new ResultSet();

            resultSet.Load("a;b;1");
            var cmd = new SqlCommand();

            var rsbMock = new Mock <ResultSetBuilder>();

            rsbMock.Setup(engine => engine.Build(It.IsAny <object>()))
            .Returns(resultSet);
            var rsb = rsbMock.Object;

            var alias     = Mock.Of <IColumnAlias>(v => v.Column == 2 && v.Name == "Value");
            var predicate = Mock.Of <IPredicateInfo>
                            (
                p => p.ColumnType == ColumnType.Numeric &&
                p.ComparerType == ComparerType.Equal &&
                p.Name == "Value" &&
                p.Reference == (object)1
                            );

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate
                          (
                new List <IColumnAlias>()
            {
                alias
            }
                , new List <IColumnExpression>()
            {
            }
                , predicate
                          );

            var rowCount = new AllRowsConstraint(filter)
            {
                ResultSetBuilder = rsb
            };

            rowCount.ResultSetBuilder = rsb;

            //Method under test
            rowCount.Matches(cmd);

            //Test conclusion
            rsbMock.Verify(engine => engine.Build(It.IsAny <object>()), Times.Once());
        }
Exemplo n.º 16
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        public void Apply_NestedExpression_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    1, 10, 100
                },
                new List <object>()
                {
                    2, 2, 75
                },
                new List <object>()
                {
                    3, 5, 50
                }
            }));
            var rs = service.Execute();

            var aliases = new List <IColumnAlias>()
            {
                Mock.Of <IColumnAlias>(v => v.Column == 0 && v.Name == "a"),
                Mock.Of <IColumnAlias>(v => v.Column == 1 && v.Name == "b"),
                Mock.Of <IColumnAlias>(v => v.Column == 2 && v.Name == "c")
            };

            var expressions = new List <IColumnExpression>()
            {
                Mock.Of <IColumnExpression>(e => e.Value == "Abs([a])+[e]" && e.Name == "d"),
                Mock.Of <IColumnExpression>(e => e.Value == "[b]*[c]" && e.Name == "e")
            };

            var predicate = new Mock <IPredicateInfo>();

            predicate.SetupGet(p => p.ColumnType).Returns(ColumnType.Numeric);
            predicate.SetupGet(p => p.ComparerType).Returns(ComparerType.MoreThanOrEqual);
            predicate.SetupGet(p => p.Operand).Returns("d");
            predicate.As <IReferencePredicateInfo>().SetupGet(p => p.Reference).Returns((object)200);

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(aliases, expressions, predicate.Object);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
        }
Exemplo n.º 17
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        public void Apply_NestedExpression_CorrectResult()
        {
            var builder = new ResultSetBuilder();
            var rs      = builder.Build(new object[]
            {
                new List <object>()
                {
                    1, 10, 100
                },
                new List <object>()
                {
                    2, 2, 75
                },
                new List <object>()
                {
                    3, 5, 50
                }
            });

            var aliases = new List <IColumnAlias>()
            {
                Mock.Of <IColumnAlias>(v => v.Column == 0 && v.Name == "a"),
                Mock.Of <IColumnAlias>(v => v.Column == 1 && v.Name == "b"),
                Mock.Of <IColumnAlias>(v => v.Column == 2 && v.Name == "c")
            };

            var expressions = new List <IColumnExpression>()
            {
                Mock.Of <IColumnExpression>(e => e.Value == "Abs([a])+[e]" && e.Name == "d"),
                Mock.Of <IColumnExpression>(e => e.Value == "[b]*[c]" && e.Name == "e")
            };

            var info = Mock.Of <IPredicateInfo>
                       (
                p => p.ComparerType == ComparerType.MoreThanOrEqual &&
                p.ColumnType == ColumnType.Numeric &&
                p.Name == "d" &&
                p.Reference == (object)200
                       );

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(aliases, expressions, info);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
        }
Exemplo n.º 18
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        public void Matches_ResultSetService_CallToExecuteOnce()
        {
            var resultSet = new ResultSet();

            resultSet.Load("a;b;1");

            var serviceMock = new Mock <IResultSetService>();

            serviceMock.Setup(s => s.Execute())
            .Returns(resultSet);
            var service = serviceMock.Object;

            var alias     = Mock.Of <IColumnAlias>(v => v.Column == 2 && v.Name == "Value");
            var predicate = Mock.Of <IPredicateInfo>
                            (
                p => p.ColumnType == ColumnType.Numeric &&
                p.ComparerType == ComparerType.Equal &&
                p.Operand == "Value" &&
                p.Reference == (object)1
                            );

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate
                          (
                new List <IColumnAlias>()
            {
                alias
            }
                , new List <IColumnExpression>()
            {
            }
                , predicate
                          );

            var singleRowCtr = new SingleRowConstraint(filter);

            //Method under test
            singleRowCtr.Matches(service);

            //Test conclusion
            serviceMock.Verify(s => s.Execute(), Times.Once());
        }
Exemplo n.º 19
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        protected NBiConstraint InstantiateConstraint()
        {
            var expressions = new List <IColumnExpression>();

            if (ConstraintXml.Expression != null)
            {
                expressions.Add(ConstraintXml.Expression);
            }

            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate
                          (
                ConstraintXml.Aliases
                , expressions
                , ConstraintXml.Predicate
                          );

            var ctr = new NoRowsConstraint(filter);

            return(ctr);
        }
Exemplo n.º 20
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        protected NBiConstraint InstantiateConstraint()
        {
            RowCountConstraint ctr;
            var childConstraint = BuildChildConstraint(ConstraintXml.Comparer);

            IResultSetFilter filter = null;

            if (ConstraintXml.Filter != null)
            {
                var filterXml   = ConstraintXml.Filter;
                var expressions = new List <IColumnExpression>();
                if (filterXml.Expression != null)
                {
                    expressions.Add(filterXml.Expression);
                }

                var factory = new PredicateFilterFactory();
                filter = factory.Instantiate
                         (
                    filterXml.Aliases
                    , expressions
                    , filterXml.Predicate
                         );
                if (ConstraintXml.Comparer.Value.Replace(" ", "").EndsWith("%"))
                {
                    ctr = new RowCountFilterPercentageConstraint(childConstraint, filter);
                }
                else
                {
                    ctr = new RowCountFilterConstraint(childConstraint, filter);
                }
            }
            else
            {
                ctr = new RowCountConstraint(childConstraint);
            }

            return(ctr);
        }
Exemplo n.º 21
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        public void Apply_Variable_CorrectResult()
        {
            var service = new ObjectsResultSetResolver(
                new ObjectsResultSetResolverArgs(
                    new object[]
            {
                new List <object>()
                {
                    "(null)", 10, 100
                },
                new List <object>()
                {
                    "(empty)", 2, 75
                },
                new List <object>()
                {
                    "C", 5, 50
                }
            }));

            var rs = service.Execute();

            var aliases = new[] { Mock.Of <IColumnAlias>(v => v.Column == 0 && v.Name == "a") };

            var info = Mock.Of <IPredicateInfo>
                       (
                p => p.ComparerType == ComparerType.NullOrEmpty &&
                p.ColumnType == ColumnType.Text &&
                p.Operand == "a"
                       );
            var factory = new PredicateFilterFactory();
            var filter  = factory.Instantiate(aliases, new IColumnExpression[0], info);
            var result  = filter.Apply(rs);

            Assert.That(result.Rows, Has.Count.EqualTo(2));
        }
Exemplo n.º 22
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        public IEnumerable <Alter> InstantiateAlterations(ResultSetSystemXml resultSetXml)
        {
            if (resultSetXml.Alteration == null)
            {
                yield break;
            }

            if (resultSetXml.Alteration.Filters != null)
            {
                foreach (var filterXml in resultSetXml.Alteration.Filters)
                {
                    var expressions = new List <IColumnExpression>();
                    if (filterXml.Expression != null)
                    {
                        expressions.Add(filterXml.Expression);
                    }

                    var factory = new PredicateFilterFactory();
                    if (filterXml.Predication != null)
                    {
                        yield return(factory.Instantiate
                                     (
                                         filterXml.Aliases
                                         , expressions
                                         , filterXml.Predication
                                     ).Apply);
                    }
                    if (filterXml.Combination != null)
                    {
                        yield return(factory.Instantiate
                                     (
                                         filterXml.Aliases
                                         , expressions
                                         , filterXml.Combination.Operator
                                         , filterXml.Combination.Predicates
                                     ).Apply);
                    }
                }
            }

            if (resultSetXml.Alteration.Conversions != null)
            {
                foreach (var conversionXml in resultSetXml.Alteration.Conversions)
                {
                    var factory   = new ConverterFactory();
                    var converter = factory.Instantiate(conversionXml.Converter.From, conversionXml.Converter.To, conversionXml.Converter.DefaultValue, conversionXml.Converter.Culture);
                    var engine    = new ConverterEngine(conversionXml.Column, converter);
                    yield return(engine.Execute);
                }
            }

            if (resultSetXml.Alteration.Transformations != null)
            {
                var provider = new TransformationProvider();
                foreach (var transformationXml in resultSetXml.Alteration.Transformations)
                {
                    provider.Add(transformationXml.ColumnIndex, transformationXml);
                }
                yield return(provider.Transform);
            }
        }