I take that back - I was still using an old wfs rather than wfs-ng!
So with one change to the previous code change - query.setMaxFeatures(10+i);
and it works fine - the trick seems to be that MaxFeatures is taken to be
an absolute count rather than a number of features to return.
As to whether that's a bug or a documentation bug I'll need to check my WFS
spec tomorrow.
Ian
PS all my tests so far have been with WFS 1.0.0
On 16 February 2017 at 17:32, Ian Turton <ijtur...@gmail.com> wrote:
> 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/geoser
>> ver/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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>>
>>
>
>
> --
> Ian Turton
>
--
Ian Turton
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