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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-346) MetadataStandard.asValueMap(…) / asTreeTable(…) do not work if the argument implements more than one metadata interface
Date Fri, 13 Jan 2017 18:57:26 GMT
Martin Desruisseaux created SIS-346:
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             Summary: MetadataStandard.asValueMap(…) / asTreeTable(…) do not work if the
argument implements more than one metadata interface
                 Key: SIS-346
                 URL: https://issues.apache.org/jira/browse/SIS-346
             Project: Spatial Information Systems
          Issue Type: Bug
          Components: Metadata
    Affects Versions: 0.7, 0.6, 0.5, 0.4, 0.3
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 0.8


It is some time convenient to implement more than one interface by the same class. For example
an implementation interested only in extents defined by geographic bounding boxes could implement
{{org.opengis.metadata.extent.Extent}} and {{org.opengis.metadata.extent.GeographicBoundingBox}}
by the same class. However in such cases, we get an ambiguity that prevent most {{StandardMetadata}}
methods to work. For resolving the ambiguity, we need to tell which interface to reflect.
This information is often known since the metadata is often a return value of some getter
methods, so we can use the return type of the getter method for filtering the interface of
interest among the set of interfaces implemented by the value.

Example: if {{getExtent()}} and {{getGeographicBoundingBox()}} both return the same instance,
but in the first case the method signature declare {{Extent}} as the return value and in
the second case declare {{GeographicBoundingBox}} as the return value, we can use that information
for showing only the relevant nodes in a metadata tree.




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