Make vector grid construction a streaming process
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Key: GEOT-3132
URL: http://jira.codehaus.org/browse/GEOT-3132
Project: GeoTools
Issue Type: Improvement
Components: new modules
Reporter: Michael Bedward
Assignee: Michael Bedward
Fix For: 2.7-M1
The grid module presently constructs grids in memory, with the whole grid being
built at one time and stored in a ListFeatureCollection. The next step is to
make grid element creation a streaming process as suggested by Andrea on IRC:
- Grid creation methods will return a FeatureSource which only contains the
definition of the grid, not the grid itself.
- When the feature source gets a query (and optionally rendering hints to
decide how densely polygon vertices should be created) a FeatureCollection is
generated; this collection also only contains the grid definition, not its
contents.
- A custom FeatureIterator is used to get grid elements. Each time next() is
called the element is constructed on the fly.
- When working with a user provided feature type and GridFeatureBuilder these
are passed to the custom iterator.
The result should be a fully streaming solution with close to zero memory
footprint.
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