private ProjectionExpression Translate(Expression expression)
{
expression = Evaluator.PartialEval(expression, CanBeEvaluatedLocally);
expression = QueryBinder.Bind(this, expression);
expression = SubstringExpressionRewriter.Rewrite(expression);
expression = SubstringEmptyClauseRemover.Rewrite(expression);
expression = BinaryExpressionRewriter.Rewrite(expression);
expression = AttributeComparisonReorderingRewriter.Rewrite(expression);
expression = NullComparisonRewriter.Rewrite(expression);
expression = AndOrExpressionCollector.Rewrite(expression);
expression = RedundantExpressionRemover.Rewrite(expression);
return((ProjectionExpression)expression);
}
public void empty_string_with_no_wildcard_doesnt_become_constant()
{
// Arrange
string value = string.Empty;
var substring = CreateSubstring(value, false, false);
Expression result;
// Act
result = SubstringEmptyClauseRemover.Rewrite(substring);
// Assert
Assert.IsFalse(result.IsConstant(value));
}
public void single_string_with_no_wildcard_becomes_constant()
{
// Arrange
string value = "X";
var substring = CreateSubstring(value, false, false);
Expression result;
// Act
result = SubstringEmptyClauseRemover.Rewrite(substring);
// Assert
Assert.IsTrue(result.IsConstant(value));
}
public void simple_substring_is_unchanged_1()
{
// Arrange
string value = "X";
var substring = CreateSubstring(value, true, true);
Expression result;
// Act
result = SubstringEmptyClauseRemover.Rewrite(substring);
// Assert
Assert.IsInstanceOfType(result, typeof(SubstringExpression));
Assert.AreEqual(substring, (SubstringExpression)result);
}
public void simple_substring_is_unchanged_2()
{
// Arrange
string value1 = "X";
string value2 = "Y";
string value3 = "Z";
var substring = CreateSubstring(new string[] { value1, value2, value3 }, true, true);
Expression result;
// Act
result = SubstringEmptyClauseRemover.Rewrite(substring);
// Assert
Assert.IsInstanceOfType(result, typeof(SubstringExpression));
//Assert.AreEqual(substring.WildcardAtStart, result.
Assert.AreEqual(substring, (SubstringExpression)result);
}
public void empty_string_at_start_is_removed()
{
// Arrange
string value = "X";
var substring = CreateSubstring(new string[] { string.Empty, value }, true, true);
Expression result;
SubstringExpression substringResult;
// Act
result = SubstringEmptyClauseRemover.Rewrite(substring);
// Assert
Assert.IsInstanceOfType(result, typeof(SubstringExpression));
substringResult = (SubstringExpression)result;
Assert.AreEqual(1, substringResult.Parts.Count);
Assert.IsTrue(substringResult.Parts[0].IsConstant(value));
Assert.AreEqual(true, substringResult.WildcardAtStart);
}
public void empty_strings_in_middle_are_removed()
{
// Arrange
string[] strings = { "X", string.Empty, "Y", string.Empty, string.Empty, "Z" };
var substring = CreateSubstring(strings, true, true);
Expression result;
SubstringExpression substringResult;
// Act
result = SubstringEmptyClauseRemover.Rewrite(substring);
// Assert
Assert.IsInstanceOfType(result, typeof(SubstringExpression));
substringResult = (SubstringExpression)result;
Assert.AreEqual(3, substringResult.Parts.Count);
Assert.IsTrue(substringResult.Parts[0].IsConstant("X"));
Assert.IsTrue(substringResult.Parts[1].IsConstant("Y"));
Assert.IsTrue(substringResult.Parts[2].IsConstant("Z"));
}
public void null_strings_treated_the_same()
{
// Arrange
string value1 = "X";
string value2 = "Y";
var substring = CreateSubstring(new string[] { value1, null, value2 }, true, true);
Expression result;
SubstringExpression substringResult;
// Act
result = SubstringEmptyClauseRemover.Rewrite(substring);
// Assert
Assert.IsInstanceOfType(result, typeof(SubstringExpression));
substringResult = (SubstringExpression)result;
Assert.AreEqual(2, substringResult.Parts.Count);
Assert.IsTrue(substringResult.Parts[0].IsConstant(value1));
Assert.IsTrue(substringResult.Parts[1].IsConstant(value2));
}
