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public Accept ( |
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| visitor | ||
| Результат | ||
private static void Visit(SqlExpression exp, bool equals = false)
{
var visitor = new SqlExpressionVisitor();
var result = exp.Accept(visitor);
Assert.IsType(exp.GetType(), result);
Assert.Equal(equals, result.Equals(exp));
result = visitor.Visit(exp);
Assert.IsType(exp.GetType(), result);
Assert.Equal(equals, result.Equals(exp));
}
/// <summary>
/// Visits a given SQL expression.
/// </summary>
/// <param name="expression">The <see cref="SqlExpression"/> to visit.</param>
/// <returns>
/// Returns an instance of <see cref="SqlExpression"/> as result of the visit.
/// </returns>
public virtual SqlExpression Visit(SqlExpression expression)
{
if (expression == null)
return null;
var expressionType = expression.ExpressionType;
switch (expressionType) {
case SqlExpressionType.Add:
case SqlExpressionType.Subtract:
case SqlExpressionType.Divide:
case SqlExpressionType.Multiply:
case SqlExpressionType.Modulo:
case SqlExpressionType.And:
case SqlExpressionType.Or:
case SqlExpressionType.XOr:
case SqlExpressionType.Equal:
case SqlExpressionType.NotEqual:
case SqlExpressionType.Like:
case SqlExpressionType.NotLike:
case SqlExpressionType.GreaterThan:
case SqlExpressionType.GreaterOrEqualThan:
case SqlExpressionType.SmallerThan:
case SqlExpressionType.SmallerOrEqualThan:
case SqlExpressionType.Is:
case SqlExpressionType.IsNot:
return VisitBinary((SqlBinaryExpression) expression);
case SqlExpressionType.Negate:
case SqlExpressionType.Not:
case SqlExpressionType.UnaryPlus:
return VisitUnary((SqlUnaryExpression) expression);
case SqlExpressionType.Cast:
return VisitCast((SqlCastExpression) expression);
case SqlExpressionType.Reference:
return VisitReference((SqlReferenceExpression) expression);
case SqlExpressionType.VariableReference:
return VisitVariableReference((SqlVariableReferenceExpression) expression);
case SqlExpressionType.Assign:
return VisitAssign((SqlAssignExpression) expression);
case SqlExpressionType.FunctionCall:
return VisitFunctionCall((SqlFunctionCallExpression) expression);
case SqlExpressionType.Constant:
return VisitConstant((SqlConstantExpression) expression);
case SqlExpressionType.Conditional:
return VisitConditional((SqlConditionalExpression) expression);
case SqlExpressionType.Query:
return VisitQuery((SqlQueryExpression) expression);
case SqlExpressionType.Tuple:
return VisitTuple((SqlTupleExpression) expression);
case SqlExpressionType.All:
case SqlExpressionType.Any:
return VisitQuantified((SqlQuantifiedExpression) expression);
default:
return expression.Accept(this);
}
}
/// <summary>
/// Visits a given SQL expression.
/// </summary>
/// <param name="expression">The <see cref="SqlExpression"/> to visit.</param>
/// <returns>
/// Returns an instance of <see cref="SqlExpression"/> as result of the visit.
/// </returns>
public virtual SqlExpression Visit(SqlExpression expression)
{
if (expression == null)
{
return(null);
}
var expressionType = expression.ExpressionType;
switch (expressionType)
{
case SqlExpressionType.Add:
case SqlExpressionType.Subtract:
case SqlExpressionType.Divide:
case SqlExpressionType.Multiply:
case SqlExpressionType.Modulo:
case SqlExpressionType.And:
case SqlExpressionType.Or:
case SqlExpressionType.XOr:
case SqlExpressionType.Equal:
case SqlExpressionType.NotEqual:
case SqlExpressionType.Like:
case SqlExpressionType.NotLike:
case SqlExpressionType.GreaterThan:
case SqlExpressionType.GreaterOrEqualThan:
case SqlExpressionType.SmallerThan:
case SqlExpressionType.SmallerOrEqualThan:
case SqlExpressionType.Is:
case SqlExpressionType.IsNot:
case SqlExpressionType.AllEqual:
case SqlExpressionType.AllNotEqual:
case SqlExpressionType.AllGreaterThan:
case SqlExpressionType.AllSmallerThan:
case SqlExpressionType.AllGreaterOrEqualThan:
case SqlExpressionType.AllSmallerOrEqualThan:
case SqlExpressionType.AnyEqual:
case SqlExpressionType.AnyNotEqual:
case SqlExpressionType.AnyGreaterThan:
case SqlExpressionType.AnySmallerThan:
case SqlExpressionType.AnyGreaterOrEqualThan:
case SqlExpressionType.AnySmallerOrEqualThan:
return(VisitBinary((SqlBinaryExpression)expression));
case SqlExpressionType.Negate:
case SqlExpressionType.Not:
case SqlExpressionType.UnaryPlus:
return(VisitUnary((SqlUnaryExpression)expression));
case SqlExpressionType.Cast:
return(VisitCast((SqlCastExpression)expression));
case SqlExpressionType.Reference:
return(VisitReference((SqlReferenceExpression)expression));
case SqlExpressionType.VariableReference:
return(VisitVariableReference((SqlVariableReferenceExpression)expression));
case SqlExpressionType.Assign:
return(VisitAssign((SqlAssignExpression)expression));
case SqlExpressionType.FunctionCall:
return(VisitFunctionCall((SqlFunctionCallExpression)expression));
case SqlExpressionType.Constant:
return(VisitConstant((SqlConstantExpression)expression));
case SqlExpressionType.Conditional:
return(VisitConditional((SqlConditionalExpression)expression));
case SqlExpressionType.Query:
return(VisitQuery((SqlQueryExpression)expression));
case SqlExpressionType.Tuple:
return(VisitTuple((SqlTupleExpression)expression));
default:
return(expression.Accept(this));
}
}
