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https://issues.apache.org/jira/browse/SIS-355?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux closed SIS-355.
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> 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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