Martin Desruisseaux created SIS-355:
---------------------------------------
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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
