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From "Luc Maisonobe (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-571) make FieldVector generic
Date Sat, 01 Oct 2011 14:27:34 GMT

     [ https://issues.apache.org/jira/browse/MATH-571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-571.
--------------------------------

    Resolution: Won't Fix

Setting to Won't Fix as per comments above.
                
> make FieldVector generic
> ------------------------
>
>                 Key: MATH-571
>                 URL: https://issues.apache.org/jira/browse/MATH-571
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Arne Plöse
>            Priority: Minor
>             Fix For: 3.0
>
>
> 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 ArrayComplexVector is lost
thus access to getReal() is not possible.
> solution:
> public class InheritationTest {
>     public static interface FieldVector<T extends FieldElement<T>, R extends
FieldVector> {
>         R copy();
>     }
>     public abstract static class ArrayFieldVectorExtendable<T extends FieldElement<T>,
R extends FieldVector> implements FieldVector<T, R>, Serializable {
>         protected T[] data;
>         @Override
>         public R copy() {
>             return createVector(data);
>         }
>         abstract protected R createVector(T[] data);
>     }
>     public static class ArrayFieldVector<T extends FieldElement<T>> extends
ArrayFieldVectorExtendable<T, ArrayFieldVector> {
>         @Override
>         protected ArrayFieldVector<T> createVector(T[] data) {
>             ArrayFieldVector<T> result = new ArrayFieldVector<T>();
>             result.data = data;
>             return result;
>         }
>     }
>     public static class ArrayComplexVector extends ArrayFieldVectorExtendable<Complex,
ArrayComplexVector> {
>         @Override
>         protected ArrayComplexVector createVector(Complex[] data) {
>             ArrayComplexVector result = new ArrayComplexVector();
>             result.data = data;
>             return result;
>         }
>         public double[] getReal() {
>             return null;
>         }
>         public double[] getImaginary() {
>             return null;
>         }
>     }
>     public void test() {
>         ArrayComplexVector v = new ArrayComplexVector();
>         ArrayComplexVector v1 = v.copy();  // FiledVector type survives ...
>     }
> }

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