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https://issues.apache.org/jira/browse/GEOMETRY-92?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17088574#comment-17088574
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Matt Juntunen commented on GEOMETRY-92:
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bq. But the argument is that what is good for Span is IMHO equally good for Ray:
If we want to standardize the convex subline implementations here, I would
prefer to place {{Span}} in its own class than to put everything into {{Line}}.
I much prefer the top-level class names of {{Ray}} and {{Segment}} to the
qualified ones {{Line.Ray}} and {{Line.Segment}}. It will also be easier to
maintain that way.
bq. Hence it seems natural to ask whether there is something to share,
implementation-wise, so as to make that fact explicit. A HalfLine3D class?
They could. I considered that for a bit but did not end up doing it since they
would only share implementations for the methods {{isFull()}}, {{isFinite()}},
{{isInfinite()}}, and {{getSize()}}.
> Segment is not mathematically correct
> -------------------------------------
>
> Key: GEOMETRY-92
> URL: https://issues.apache.org/jira/browse/GEOMETRY-92
> Project: Apache Commons Geometry
> Issue Type: Improvement
> Reporter: Matt Juntunen
> Priority: Major
> Labels: beta1
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The {{Segment}} class is not mathematically correct because line segments are
> defined as having distinct start and end points, whereas the start and end
> points in {{Segment}} are optional. In other words, an instance of
> {{Segment}} can represent an entire line, a ray, or a segment. I propose
> renaming the existing {{Segment}} class to {{ConvexSubLine}} and creating
> subclasses to represent the distinct types of sublines.
> * {{ConvexSubLine}} - Abstract convex subline class. The factory methods
> (such as fromPoints()), would examine the inputs and return one of the
> specific subclasses below. Each subclass would also contain its own factory
> methods that apply input validation (eg, no null points when creating a
> {{Segment}}). This would also allow each subclass to optimize some
> computations based on the known characteristics of the represented entity.
> ** {{FullLine}} - no start or end points
> ** {{Segment}} - contains non-null start point and end point
> ** {{Ray}} - contains non-null start point and null end point
> ** {{ReverseRay}} - contains non-null end point and null start point (not
> sure if there is a more mathematical term for this)
> These changes would also apply to the 3D classes:
> * {{ConvexSubLine3D}}
> ** {{FullLine3D}}
> ** {{Segment3D}}
> ** {{Ray3D}}
> ** {{ReverseRay3D}}
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