protected override CamlExpression VisitWhereLogicalExpression(CamlWhereLogicalExpression expression)
{
CamlLogicalOperator previousOperator = currentOperater;
using (new WhereExpressionScope(this, expression.Operator)) {
if (expression.Operator == CamlLogicalOperator.Not)
{
queryBuilder.Append(" -");
Visit(expression.Left);
}
else
{
if (previousOperator != expression.Operator)
{
queryBuilder.Append("(");
}
Visit(expression.Left);
if (expression.Operator == CamlLogicalOperator.Or)
{
queryBuilder.Append(" OR ");
}
else
{
queryBuilder.Append(" ");
}
Visit(expression.Right);
if (previousOperator != expression.Operator)
{
queryBuilder.Append(")");
}
}
}
return(expression);
}
/// <summary>
/// Called when visiting a logical comparison expression inside a <Where/> element.
/// </summary>
/// <param name="expression">An instance of the <see cref="CamlWhereLogicalExpression"/> class representing the logical comparison expression.</param>
/// <returns>When overriden, returns an expression to replace the expression given in arguments.</returns>
protected virtual CamlExpression VisitWhereLogicalExpression(CamlWhereLogicalExpression expression)
{
CommonHelper.ConfirmNotNull(expression, "expression");
CamlExpression l = VisitChecked(expression.Left, CamlExpressionType.Where);
CamlExpression r = VisitChecked(expression.Right, CamlExpressionType.Where);
if (l != expression.Left || r != expression.Right)
{
switch (expression.Operator)
{
case CamlLogicalOperator.And:
return(Caml.And(l, r));
case CamlLogicalOperator.Or:
return(Caml.Or(l, r));
case CamlLogicalOperator.Not:
return(Caml.Not(l));
}
throw new InvalidOperationException();
}
return(expression);
}
