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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-355) Provide a "deep copy" operation on ISO 19115 metadata
Date Mon, 27 Feb 2017 18:52:45 GMT
Martin Desruisseaux created SIS-355:
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             Summary: Provide a "deep copy" operation on ISO 19115 metadata
                 Key: SIS-355
                 URL: https://issues.apache.org/jira/browse/SIS-355
             Project: Spatial Information Systems
          Issue Type: Task
          Components: Metadata
    Affects Versions: 0.7, 0.6, 0.5, 0.4, 0.3
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
            Priority: Minor
             Fix For: 0.8


In Apache SIS, all implementation classes of ISO 19115 metadata types have a shallow copy
constructor. However there is nothing for performing a deep copy (the {{clone()}} method is
not for this purpose). While deep copy should be avoided, it is sometime useful for example
when using an existing metadata as a template.

h3. Better alternative
Note that the {{ModifiableMetadata.unmodifiable()}} method provides a better way to use a
metadata as a template, as it returns a snapshot and allows the caller to continue to modify
the original metadata object and create new snapshots. This approach allows sharing the children
that have the same content, thus reducing memory usage. In comparison, deep copy operations
unconditionally duplicate everything, no matter if it was needed or not. Nevertheless deep
copies are still sometime useful, for example when we do not have the original {{ModifiableMetadata}}
instance anymore.



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