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);
}
public JoinConnect(JoinType type, DataFieldExpression on)
{
_type = type;
_on = on;
}
/// <summary>
/// Or the specified expression1 and expression2.
/// </summary>
/// <param name="expression1">Expression1.</param>
/// <param name="expression2">Expression2.</param>
internal static DataFieldExpression Or(DataFieldExpression expression1, DataFieldExpression expression2)
{
return(Concat(expression1, ConcatOperatorType.OR, expression2));
}
