/// <summary>
/// Concat the specified expression1, operatorType and expression2.
/// </summary>
/// <param name="expression1">Expression1.</param>
/// <param name="operatorType">Operator type.</param>
/// <param name="expression2">Expression2.</param>
internal static QueryExpression Concat(QueryExpression expression1, ConcatOperatorType operatorType, QueryExpression expression2)
{
if (expression1 == null && expression2 == null)
{
return(null);
}
else if (expression1 == null && expression2 != null)
{
return(expression2);
}
else if (expression1 != null && expression2 == null)
{
return(expression1);
}
DataEntityMapping demapping = null;
if (expression1.TableMapping != null)
{
demapping = expression1.TableMapping;
}
else if (expression2.TableMapping != null)
{
demapping = expression2.TableMapping;
}
QueryExpression newExpression = new QueryExpression(demapping);
newExpression._expression1 = expression1;
newExpression._expression2 = expression2;
newExpression._operatorType = operatorType;
newExpression.mutliQuery = expression1.mutliQuery | expression2.mutliQuery;
return(newExpression);
}
internal static DataFieldExpression Concat(DataFieldExpression expression1, ConcatOperatorType operatorType, DataFieldExpression expression2)
{
if (expression1 == null && expression2 == null)
{
return(null);
}
if (expression1 == null)
{
return(expression2);
}
if (expression2 == null)
{
return(expression1);
}
var newExpression = new DataFieldExpression
{
_expression1 = expression1,
_expression2 = expression2,
_operatorType = operatorType
};
return(newExpression);
}
internal static DataFieldExpression Concat(DataFieldExpression expression1, ConcatOperatorType operatorType, DataFieldExpression expression2)
{
if (expression1 == null && expression2 == null)
{
return(null);
}
else if (expression1 == null && expression2 != null)
{
return(expression2);
}
else if (expression1 != null && expression2 == null)
{
return(expression1);
}
DataFieldExpression newExpression = new DataFieldExpression();
newExpression._expression1 = expression1;
newExpression._expression2 = expression2;
newExpression._operatorType = operatorType;
return(newExpression);
}
/// <summary>
/// Concat the specified expression1, operatorType and expression2.
/// </summary>
/// <param name="expression1">Expression1.</param>
/// <param name="operatorType">Operator type.</param>
/// <param name="expression2">Expression2.</param>
internal static QueryExpression Concat(QueryExpression expression1, ConcatOperatorType operatorType, QueryExpression expression2)
{
if (expression1 == null && expression2 == null)
{
return(null);
}
if (expression1 == null)
{
return(expression2);
}
if (expression2 == null)
{
return(expression1);
}
DataEntityMapping deMapping = null;
if (expression1.TableMapping != null)
{
deMapping = expression1.TableMapping;
}
else if (expression2.TableMapping != null)
{
deMapping = expression2.TableMapping;
}
var newExpression = new QueryExpression(deMapping)
{
_expression1 = expression1,
_expression2 = expression2,
_operatorType = operatorType,
MultiQuery = expression1.MultiQuery | expression2.MultiQuery
};
return(newExpression);
}