Re: [Geotools-gt2-users] Keep the order of featureMembers in a FeatureCollection, as they are declared in the XML file.

electrotype Thu, 25 Sep 2014 08:35:31 -0700

I tried :

------------------------
GMLConfiguration configuration = new GMLConfiguration();

configuration.setupBindings().put(new QName("http://www.opengis.net/gml";,"AbstractFeatureCollectionType"), KeepOrderFeatureCollectionTypeBinding.class);

Parser parser = new Parser(configuration);
------------------------


Where "KeepOrderFeatureCollectionTypeBinding" is :

------------------------

public class KeepOrderFeatureCollectionTypeBinding extends 
AbstractFeatureCollectionTypeBinding  {

    @Override
    public Object parse(ElementInstance instance, Node node, Object value) 
throws Exception {
            SimpleFeatureCollection featureCollection =
                (SimpleFeatureCollection) 
node.getChildValue(FeatureCollection.class);
            if (featureCollection == null) {
*featureCollection = createFeatureCollection();*
            }

            //&lt;element maxOccurs="unbounded" minOccurs="0" 
ref="gml:featureMember"/&gt;
            @SuppressWarnings("unchecked")
            List<SimpleFeature> childValues = 
node.getChildValues(SimpleFeature.class);

            // example DefaultFeatureCollections or ListFeatureCollection
            Collection<SimpleFeature> collection = 
DataUtilities.collectionCast( featureCollection );
            collection.addAll(childValues);

            //&lt;element minOccurs="0" ref="gml:featureMembers"/&gt;

SimpleFeature[] featureMembers = (SimpleFeature[])node.getChildValue(SimpleFeature[].class);


            if (featureMembers != null) {
                for (int i = 0; i < featureMembers.length; i++) {
                    collection.add(featureMembers[i]);
                }
            }

            return featureCollection;
        }

    protected SimpleFeatureCollection *createFeatureCollection()* {
        return new DefaultFeatureCollection(); // To change!
    }

}

------------------------

My goal is to be able to change the SimpleFeatureCollection implementation used.

But it doesn't seem to work. For this QName, it is still /AbstractFeatureCollectionTypeBinding/ thatis used, not my /KeepOrderFeatureCollectionTypeBinding /class.


Any idea?

Julien



On 9/25/2014 7:58 AM, electrotype wrote:

Thanks for the reply Jody.

But how can I tell the parse() method to use one implementation instead of 
another?

I see the Parser's constructor can take a Configuration object, which seems to use PicoContainerand have a registerBindings() method... Is that the way to configure which implementation of theFeatureCollection I want it to use?


Can you provide a small code example?

Julien



On 9/24/2014 4:01 PM, Jody Garnett wrote:

There are several FeatureCollection implementations for different purposes. TheDefaultFeatureCollection implementation is built around a TreeMap and sorts the contents byFeatureId.


See the docs for alternatives:
- 
http://docs.geotools.org/latest/userguide/library/main/collection.html#performance-options

Jody Garnett

On Wed, Sep 24, 2014 at 12:24 PM, electrotype <electrot...@gmail.com<mailto:electrot...@gmail.com>> wrote:


    I use org.geotools.xml.Parser#parse(...) to parse a GML based XML file. 
This XML contains a
    <gml:FeatureCollection> which contains multiple <gml:featureMember>.

    The problem is that the resulting DefaultFeatureCollection doesn't seem to 
keep the order in
    which
    the featureMembers are declared.

    For example,

    ----------------------
    Iterator<SimpleFeature> iterator = defaultFeatureCollection.iterator();
    ----------------------

    ... returns an Iterator with the elements in another order. I think 
DefaultFeatureCollection
    uses a
    TreeMap to keep the elements, but sort them by internal ID, not by the 
order they appear in
    the XML.

    Our application would require the order of the featureMembers to be kept... 
Is there a way to
    achieve this?

    The only way I currently think of is to manually modify the generated
    DefaultFeatureCollection after
    GeoTools has parsed the XML file.

    The highest version of GeoTools I can use is 11.2 since our application 
uses Java 6.

    Thanks in advance!

    Julien

    
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Re: [Geotools-gt2-users] Keep the order of featureMembers in a FeatureCollection, as they are declared in the XML file.

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