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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SIS-355) Provide a "deep copy" operation on ISO 19115 metadata
Date Tue, 28 Feb 2017 12:42:45 GMT

     [ https://issues.apache.org/jira/browse/SIS-355?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux resolved SIS-355.
-------------------------------------
    Resolution: Fixed

> 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: 0.3, 0.4, 0.5, 0.6, 0.7
>            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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