public Expression Transform (MethodCallExpression methodCallExpression)
{
ArgumentUtility.CheckNotNull ("methodCallExpression", methodCallExpression);
MethodCallTransformerUtility.CheckArgumentCount (methodCallExpression, 1);
MethodCallTransformerUtility.CheckStaticMethod (methodCallExpression);
var isNullExpression = new SqlIsNullExpression (methodCallExpression.Arguments[0]);
var lenExpression = new SqlLengthExpression (methodCallExpression.Arguments[0]);
var lenIsZeroExpression = Expression.Equal (lenExpression, new SqlLiteralExpression (0));
return Expression.OrElse (isNullExpression, lenIsZeroExpression);
}
public void Transform ()
{
var method = typeof (string).GetMethod ("IsNullOrEmpty", new[] { typeof(string) });
var objectExpression = Expression.Constant ("Test");
var expression = Expression.Call (method, objectExpression);
var transformer = new IsNullOrEmptyMethodCallTransformer ();
var result = transformer.Transform (expression);
var expectedIsNullExpression = new SqlIsNullExpression (objectExpression);
var expectedLenExpression = new SqlLengthExpression (objectExpression);
var expectedResult = Expression.OrElse (expectedIsNullExpression, Expression.Equal (expectedLenExpression, new SqlLiteralExpression(0)));
SqlExpressionTreeComparer.CheckAreEqualTrees (expectedResult, result);
}
public Expression SplitPotentialCompoundComparison (SqlIsNullExpression potentialCompoundComparison)
{
ArgumentUtility.CheckNotNull ("potentialCompoundComparison", potentialCompoundComparison);
var innerExpressionAsNewExpression = potentialCompoundComparison.Expression as NewExpression;
if (innerExpressionAsNewExpression != null)
{
if (innerExpressionAsNewExpression.Arguments.Count == 0)
return Expression.Constant (false);
return innerExpressionAsNewExpression.Arguments
.Select (arg => (Expression) new SqlIsNullExpression (arg))
.Aggregate (Expression.AndAlso);
}
return potentialCompoundComparison;
}
public void SplitPotentialCompoundComparison_SqlIsNullExpression_ExpandsNewExpression_ByCheckingAllArguments_ZeroArguments ()
{
var newExpression = Expression.New (TypeForNewExpression.GetConstructor());
var sqlIsNullExpression = new SqlIsNullExpression (newExpression);
var result = _compoundExpressionComparisonSplitter.SplitPotentialCompoundComparison (sqlIsNullExpression);
var expected = Expression.Constant (false);
SqlExpressionTreeComparer.CheckAreEqualTrees (expected, result);
}
public void SplitPotentialCompoundComparison_SqlIsNullExpression_ExpandsNewExpression_ByCheckingAllArguments_OnlyOneArgument ()
{
var arg1 = Expression.Constant (1);
var newExpression = Expression.New (TypeForNewExpression.GetConstructor (typeof (int)), new[] { arg1 });
var sqlIsNullExpression = new SqlIsNullExpression (newExpression);
var result = _compoundExpressionComparisonSplitter.SplitPotentialCompoundComparison (sqlIsNullExpression);
var expected = new SqlIsNullExpression (arg1);
SqlExpressionTreeComparer.CheckAreEqualTrees (expected, result);
}
public void SplitPotentialCompoundComparison_SqlIsNullExpression_ReturnsNonNewExpression_Unchanged ()
{
var expression = Expression.Constant (1);
var sqlIsNullExpression = new SqlIsNullExpression (expression);
var result = _compoundExpressionComparisonSplitter.SplitPotentialCompoundComparison (sqlIsNullExpression);
Assert.That (result, Is.SameAs (sqlIsNullExpression));
}
public Expression VisitSqlIsNullExpression (SqlIsNullExpression expression)
{
ArgumentUtility.CheckNotNull ("expression", expression);
var newExpression = ApplySingleValueContext (expression.Expression);
if (newExpression != expression.Expression)
return new SqlIsNullExpression (newExpression);
return expression;
}
public void VisitSqlIsNullExpression_RevisitingTerminatesAfterInnerChanges_WithoutOuterChanges ()
{
var inner = Expression.Constant (0);
var isNullExpression = new SqlIsNullExpression (inner);
var fakeResolvedInner = new SqlLiteralExpression (1);
_resolverMock.Expect (mock => mock.ResolveConstantExpression (inner)).Return (fakeResolvedInner);
_entityIdentityResolverMock
.Expect (mock => mock.ResolvePotentialEntityComparison (Arg<SqlIsNullExpression>.Is.Anything))
.Return (null)
.WhenCalled (mi => mi.ReturnValue = mi.Arguments[0]);
_compoundComparisonSplitterMock
.Expect (mock => mock.SplitPotentialCompoundComparison (Arg<SqlIsNullExpression>.Is.Anything))
.Return (null)
.WhenCalled (mi => mi.ReturnValue = mi.Arguments[0]);
// No revisiting
var result = _visitor.VisitExpression (isNullExpression);
_resolverMock.VerifyAllExpectations ();
_entityIdentityResolverMock.VerifyAllExpectations ();
_compoundComparisonSplitterMock.VerifyAllExpectations ();
Assert.That (result, Is.TypeOf<SqlIsNullExpression> ());
Assert.That (((SqlIsNullExpression) result).Expression, Is.SameAs (fakeResolvedInner));
}
public void VisitSqlIsNullExpression ()
{
var inner = Expression.Constant (0);
var isNullExpression = new SqlIsNullExpression (inner);
var fakeResolvedInner = new SqlLiteralExpression (1);
_resolverMock.Expect (mock => mock.ResolveConstantExpression (inner)).Return (fakeResolvedInner);
var fakeResolvedEntityComparison = new SqlIsNullExpression (Expression.Constant (2));
_entityIdentityResolverMock
.Expect (mock => mock.ResolvePotentialEntityComparison (Arg<SqlIsNullExpression>.Matches (e => e.Expression == fakeResolvedInner)))
.Return (fakeResolvedEntityComparison);
var fakeSplitCompoundComparison = new SqlIsNullExpression (Expression.Constant (3));
_compoundComparisonSplitterMock
.Expect (mock => mock.SplitPotentialCompoundComparison (fakeResolvedEntityComparison))
.Return (fakeSplitCompoundComparison);
// Result is revisited
_resolverMock
.Expect (mock => mock.ResolveConstantExpression ((ConstantExpression) fakeSplitCompoundComparison.Expression))
.Return (fakeSplitCompoundComparison.Expression);
_entityIdentityResolverMock
.Expect (mock => mock.ResolvePotentialEntityComparison (fakeSplitCompoundComparison))
.Return (fakeSplitCompoundComparison);
_compoundComparisonSplitterMock
.Expect (mock => mock.SplitPotentialCompoundComparison (fakeSplitCompoundComparison))
.Return (fakeSplitCompoundComparison);
var result = _visitor.VisitExpression (isNullExpression);
_resolverMock.VerifyAllExpectations ();
_entityIdentityResolverMock.VerifyAllExpectations ();
_compoundComparisonSplitterMock.VerifyAllExpectations ();
Assert.That (result, Is.SameAs (fakeSplitCompoundComparison));
}
public void VisitSqlIsNullExpression_AppliesSingleValueSemantics_ThrowsForComplexValue ()
{
var entityExpression = SqlStatementModelObjectMother.CreateSqlEntityDefinitionExpression (typeof (Cook));
var sqlIsNullExpressionWithEntity = new SqlIsNullExpression (entityExpression);
Assert.That (() => _valueRequiredVisitor.VisitSqlIsNullExpression (sqlIsNullExpressionWithEntity), Throws.TypeOf<NotSupportedException> ());
}
public void ResolvePotentialEntityComparison_SqlIsNullExpression_ResolvesEntitiesToIdentity ()
{
var sqlIsNullExpression = new SqlIsNullExpression (_entityExpression);
var result = _entityIdentityResolver.ResolvePotentialEntityComparison (sqlIsNullExpression);
var expected = new SqlIsNullExpression (_entityExpression.GetIdentityExpression ());
SqlExpressionTreeComparer.CheckAreEqualTrees (expected, result);
}
public void VisitSqlIsNullExpression ()
{
var expression = Expression.Constant ("test");
var sqlIsNullExpression = new SqlIsNullExpression (expression);
SqlGeneratingExpressionVisitor.GenerateSql (
sqlIsNullExpression, _commandBuilder, _stageMock);
Assert.That (_commandBuilder.GetCommandText(), Is.EqualTo ("(@1 IS NULL)"));
}
public void SetUp ()
{
_sqlIsNullExpression = new SqlIsNullExpression (Expression.Constant(2));
}
public Expression VisitSqlIsNullExpression (SqlIsNullExpression expression)
{
ArgumentUtility.CheckNotNull ("expression", expression);
var baseVisitedExpression = (SqlIsNullExpression) base.VisitExtensionExpression (expression);
var expressionWithEntityComparisonResolved = _entityIdentityResolver.ResolvePotentialEntityComparison (baseVisitedExpression);
var result = _compoundComparisonSplitter.SplitPotentialCompoundComparison (expressionWithEntityComparisonResolved);
if (baseVisitedExpression != result)
return VisitExpression (result);
return baseVisitedExpression;
}
public void ResolvePotentialEntityComparison_SqlIsNullExpression_NonEntities_ReturnsSameExpression ()
{
var sqlIsNullExpression = new SqlIsNullExpression (Expression.Constant (0));
var result = _entityIdentityResolver.ResolvePotentialEntityComparison (sqlIsNullExpression);
Assert.That (result, Is.SameAs (sqlIsNullExpression));
}
public SqlIsNullExpression ResolvePotentialEntityComparison (SqlIsNullExpression isNullExpression)
{
var newExpression = ResolvePotentialEntity (isNullExpression.Expression);
if (newExpression != isNullExpression.Expression)
return new SqlIsNullExpression (newExpression);
return isNullExpression;
}
public void VisitSqlIsNullExpression_AppliesSingleValueSemantics_AllowsSingleValue ()
{
var sqlIsNullExpressionWithValue = new SqlIsNullExpression (Expression.Constant (1));
var resultWithValue = _valueRequiredVisitor.VisitSqlIsNullExpression (sqlIsNullExpressionWithValue);
Assert.That (resultWithValue, Is.SameAs (sqlIsNullExpressionWithValue));
}