Make vector grid construction a streaming process
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Key: GEOT-3133
URL: http://jira.codehaus.org/browse/GEOT-3133
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...
- Create methods will return a FeatureSource which only contains the definition
of the grid, not the grid contents (ie. not features)
- When this FeatureSource receives a query and (optionally) rendering hints
specifying how densely to create polygon vertices, a FeatureCollection is
generated; this collection, like the FeatureSource, contains the grid
definition but not its contents.
- A custom FeatureIterator is used to get features from the collection; each
time next() is called a SimpleFeature is created on-the-fly for the relevant
grid element.
- When working with a user-supplied feature type and associated
GridFeatureBuilder object, 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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