[jira] [Created] (METAMODEL-145) A Column subinterface with type arguments

["Kasper Sørensen (JIRA)" <ji...@apache.org>]

Kasper Sørensen created METAMODEL-145:
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             Summary: A Column subinterface with type arguments
                 Key: METAMODEL-145
                 URL: https://issues.apache.org/jira/browse/METAMODEL-145
             Project: Apache MetaModel
          Issue Type: New Feature
            Reporter: Kasper Sørensen


I propose to introduce a new interface to extend the Column interface. This interface should have a type parameter, representing the value type of the column. My suggested name would be TypedColumn<E>.

To take advantage of this type information I propose a few changes:

DataSet: Add a getValue(TypedColumn) method. When you have a typed column you can then get values from DataSets that do not need casting:

{code}
TypedColumn<Boolean> c1 = ...
TypedColumn<String> c2 = ...
DataSet ds = ...

Boolean value1 = ds.getValue(c1);
Boolean value2 = ds.getValue(c2);
{code}

Table: Change the return type of getNumberColumns() to return TypedColumn<? extends Number>[] instead of just Column[]. Apply same principle to other such methods (getBooleanColumns, getLiteralColumns etc.).



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