That does look like a bug!
I tried the following with a local geoserver
SimpleFeatureSource source = datastore.getFeatureSource(name);
for (int i = 0; i < 2; i++) {
int count = 0;
Query query = new Query();
query.setSortBy(new SortBy[] { ff.sort("STATE_NAME",
SortOrder.DESCENDING) });
query.setStartIndex(i);
query.setMaxFeatures(10);
try (SimpleFeatureIterator itr
= source.getFeatures(query).features()) {
while (itr.hasNext()) {
SimpleFeature feature = itr.next();
System.out.println(i+" "+(count++) + " " +
feature.getAttribute("STATE_NAME"));
}
}
}
And get
0 0 Illinois
0 1 District of Columbia
0 2 Delaware
0 3 West Virginia
0 4 Maryland
0 5 Colorado
0 6 Kentucky
0 7 Kansas
0 8 Virginia
0 9 Missouri
1 0 Illinois
1 1 District of Columbia
1 2 Delaware
1 3 West Virginia
1 4 Maryland
1 5 Colorado
1 6 Kentucky
1 7 Kansas
1 8 Virginia
1 9 Missouri
which is neither offset or sorted!
I'll take a look tomorrow and see if anything pops out.
Ian
On 16 February 2017 at 15:56, Meine Toonen <meinetoo...@b3partners.nl>
wrote:
> Dear all,
> I try to retrieve features using the WFS-NG module. We do this in batches
> of 10 to show it in a table-like grid, and we support paging. With the old
> module this worked: we implemented the "paging" ourselves when the
> capabilities showed it didn't support an offset. With the new module, I
> encounter some weird behavior: according to the querycapabilities it
> supports offset (link
> <https://github.com/geotools/geotools/blob/75b7dedf87aec993a92e924ccf1d9ac4053a9434/modules/library/data/src/main/java/org/geotools/data/store/ContentFeatureSource.java#L1213-L1220>
> ).
> The first 10 (ranging from index 0 - 9) work fine, but the second 10
> (ranging from index 10 - 19) yields no result.
>
> The comments say that offset is supported through sorting (in the
> capabilities the sorting is supported through a SortedFeatureReader). But
> upon inspecting the retrieval of features through the reader, it doesn't
> use the SortedFeatureReader (the call to canSort() is true: link
> <https://github.com/geotools/geotools/blob/75b7dedf87aec993a92e924ccf1d9ac4053a9434/modules/library/data/src/main/java/org/geotools/data/store/ContentFeatureSource.java#L666-L671>
> ).
>
>
> The query to the featuresource is:
> feature type: http://flamingo4.b3p.nl/geoserver/Test_omgeving:Test_
> omgeving:cbs_gemeente_2014
> filter: [Filter.INCLUDE]
> [properties: GM_CODE, GM_NAAM]
> [sort by: GM_CODE ASCENDING]
>
> MaxFeatures is 10
> StartIndex is 10
>
>
>
> Any idea what I'm doing wrong? Or did I encounter a bug (if so, I'm happy
> to supply a patch if someone can point me in the right direction)?
>
> --
> Met vriendelijke groet,
>
>
> Meine Toonen
> B3Partners BV
> Tel: 030 214 2083
>
>
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> ------------------
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>
>
--
Ian Turton
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