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https://issues.apache.org/jira/browse/MATH-571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031300#comment-13031300
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Luc Maisonobe commented on MATH-571:
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I am slowly starting to understand.
Do you think ArrayFieldVectorExtendable interface is really needed or should
the createVector method by directly implemented in ArrayFieldVector ?
> 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 Plöse
> 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
> 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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