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From: =?utf-8?Q?Arne_Pl=C3=B6se_=28JIRA=29?= <jira@apache.org>
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Subject: [jira] [Commented] (MATH-571) make FieldVector generic
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    [ https://issues.apache.org/jira/browse/MATH-571?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D130310=
66#comment-13031066 ]=20

Arne Pl=C3=B6se commented on MATH-571:
---------------------------------

copy was just an example ... this change goes for all methods that generate=
s an Fieldvector as output i.e. ebeMultiply ...


> make FieldVector generic
> ------------------------
>
>                 Key: MATH-571
>                 URL: https://issues.apache.org/jira/browse/MATH-571
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: Arne Pl=C3=B6se
>            Priority: Minor
>
> make FieldVector generic, so one can extend i.e. ArrayVieldVector<Complex=
> to ArrayComplexVector an introduce new methoids (getReal())...
> if one has an equation complexvector.copy the original type ArrayComplexV=
ector is lost thus access to getReal() is not possible.
> solution:
> public class InheritationTest {
>     public static interface FieldVector<T extends FieldElement<T>, R exte=
nds FieldVector> {
>         R copy();
>     }
>     public abstract static class ArrayFieldVectorExtendable<T extends Fie=
ldElement<T>, R extends FieldVector> implements FieldVector<T, R>, Serializ=
able {
>         protected T[] data;
>         @Override
>         public R copy() {
>             return createVector(data);
>         }
>         abstract protected R createVector(T[] data);
>     }
>     public static class ArrayFieldVector<T extends FieldElement<T>> exten=
ds ArrayFieldVectorExtendable<T, ArrayFieldVector> {
>         @Override
>         protected ArrayFieldVector<T> createVector(T[] data) {
>             ArrayFieldVector<T> result =3D new ArrayFieldVector<T>();
>             result.data =3D data;
>             return result;
>         }
>     }
>     public static class ArrayComplexVector extends ArrayFieldVectorExtend=
able<Complex, ArrayComplexVector> {
>         @Override
>         protected ArrayComplexVector createVector(Complex[] data) {
>             ArrayComplexVector result =3D new ArrayComplexVector();
>             result.data =3D data;
>             return result;
>         }
>         public double[] getReal() {
>             return null;
>         }
>         public double[] getImaginary() {
>             return null;
>         }
>     }
>     public void test() {
>         ArrayComplexVector v =3D new ArrayComplexVector();
>         ArrayComplexVector v1 =3D v.copy();  // FiledVector type survives=
 ...
>     }
> }

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