src/main/java/com/helger/genericode/Genericode10Helper.java
public static void getAllColumns (@Nonnull final ColumnSet aColumnSet, @Nonnull final Collection <Column> aTarget)
  {
    CollectionHelper.findAll (aColumnSet.getColumnChoice (), o -> o instanceof Column, o -> aTarget.add ((Column) o));
  }
public static void getAllColumns (@Nonnull final ColumnSet aColumnSet, @Nonnull final Collection <Column> aTarget)
  {
    CollectionHelper.findAll (aColumnSet.getColumnChoice (), o -> o instanceof Column, o -> aTarget.add ((Column) o));
  }
Get all contained columns

@param aColumnSet
The column set to scan. May not be <code>null</code>.
@param aTarget
A non-<code>null</code> list where all columns should be added. May
not be <code>null</code>.