Glancing over those docs, I don't think we'll have any problems with it.
It's a good 'standard' to shoot for.
I do have some more questions about writing-a-csv. I finally got into
implementing the CSVFeatureWriter and I'm not sure how to fit it into
ContentFeatureStore, etc. Allow me to ramble a bit..
For starters, I'm working on this API:
SimpleFeatureStore.modifyFeatures(String name, Object
attributeValue, Filter filter).
My understanding of that API is that the resulting csv file will contain
the same rows as before, in the same order, but with the specified
attribute updated in just those rows that match the filter. Correct? If
so, let's examine the implementation of modifyFeatures in
ContentFeatureStore:
FeatureWriter<SimpleFeatureType, SimpleFeature> writer =
getWriter(filter, WRITER_UPDATE);
try {
while (writer.hasNext()) {
SimpleFeature toWrite = writer.next();
for (int i = 0; i < type.length; i++) {
toWrite.setAttribute(type[i], value[i]);
}
writer.write();
}
} finally {
writer.close();
}
It gets a FeatureWriter that, presumably, delivers just those rows that
match the filter. But if the writer actually writes out the modified
rows to a file, then you end up with just the modified rows and not the
rest. Alternatively, the writer could operate on an in-memory structure
containing all the rows and not write out to a file until the whole
modifyFeatures is done, but I assum we want to be able to handle very
large files and therefore an in-memory copy of the whole file is not
desirable. True? It seems like the only way to make it work is to
override modifyFeatures in CSVFeatureWriter and make it work for the
particular limitations that CSV files require, but that seems not-great
either.
Suggestions?
Thanks,
Lee
On 5/11/2011 8:26 AM, Andrea Aime wrote:
> Adding one late observation to the thread. While there are few
> standards it would
> be nice if the tool could cooperate, to some extent, with the way OGR
> handles csv files, see here:
>
> http://www.gdal.org/ogr/drv_csv.html
>
> Cheers
> Andrea
>
>
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