Examples of org.geotools.data.Query

org.geotools.data.Query
Encapsulates a request for data, typically as:
```
 Query query = ... myFeatureSource.getFeatures(query); 
```
The query class is based on the Web Feature Server specification and offers a few interesting capabilities such as the ability to sort results and use a filter (similar to the WHERE clause in SQL).
Additional capabilities:
- {@linkplain #setMaxFeatures(int)} and {@linkplain #setStartIndex(Integer)} can be usedimplement 'paging' through the data source's content. This is useful if, for example, the FeatureSource has an upper limit on the number of features it can return in a single request or you are working with limited memory.
- {@linkplain #setHandle(String)} can be used to give the query a mnemonic namewhich will appear in error reporing and logs.
- {@linkplain #setCoordinateSystem(CoordinateReferenceSystem)} is used to to specify thecoordinate system that retrieved features will be "forced" into. This is often used to correct a feature source when the application and the data format have different ideas about the coordinate system (for example, the "axis order" issue).
- {@linkplain #setCoordinateSystemReproject(CoordinateReferenceSystem)} is used to ask forthe retrieved features to be reproejcted.
Vendor specific:
- {@linkplain setHints(Hints)} is used to specify venfor specific capabilitiesprovided by a feature source implementation.
Joins:
The Query class supports the concepts of joins in that a query can result in a join of the feature type to other feature types in the same datastore. For example, the following would be a spatial join that selected the country that contain a particular city.
```
 Query query = new Query("countries"); Join join = new Join("cities", CQL.toFilter("CONTAINS(geometry, b.geometry)")); join.setAlias("b"); join.setFilter(CQL.toFilter("CITY_NAME = 'Canmore'")) query.getJoins().add(join); 
```
Example:
```
 Filter filter = CQL.toFilter("NAME like '%land'"); Query query = new Query( "countries", filter ); FeatureCollection features = featureSource.getFeatures( query ); 
```
@author Chris Holmes @source $URL$ @version $Id$

  public static int getCountOfSelectedFeatures(final ILayer layer, final Filter filter) throws IOException {


    FeatureSource<SimpleFeatureType, SimpleFeature> source = layer.getResource(FeatureSource.class, null);
    assert source != null;


    final Query query = getSelectionQuery(layer);
    FeatureCollection<SimpleFeatureType, SimpleFeature> features = source.getFeatures(query);
    // if empty select all layer is computed (filter none)
    if (features.isEmpty()) {
      features = source.getFeatures(filter);
    }

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      return FeatureCollections.newCollection();
    }


    FeatureCollection<SimpleFeatureType, SimpleFeature> features;


    Query selectionQuery = getSelectionQuery(layer);


    if (!Filter.INCLUDE.equals(extraFilter)) {


      Filter selectionFilter = selectionQuery.getFilter();
      FilterFactory ff = CommonFactoryFinder.getFilterFactory(null);
      Filter filter = ff.and(selectionFilter, extraFilter);
      selectionQuery.setFilter(filter);


      features = source.getFeatures(selectionQuery);
    } else {
      features = source.getFeatures();
    }

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        monitor.worked(1);
        
        FeatureStore<SimpleFeatureType, SimpleFeature> store=layer.getResource(FeatureStore.class, new SubProgressMonitor(monitor, 2));
        String geomAttributeName = layer.getSchema().getGeometryDescriptor().getLocalName();
        String[] desiredProperties = new String[]{geomAttributeName};
        Query query=new DefaultQuery(layer.getSchema().getTypeName(), filter, 
                desiredProperties);
        FeatureCollection<SimpleFeatureType, SimpleFeature>  features = store.getFeatures(query);


        FeatureIterator<SimpleFeature> iter=features.features();
        try{

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            ProjectPlugin.getPlugin().log(e);
            return null;
        }
        BBOX filter = filterFactory.bbox(geomAttributeName, layerBounds.getMinX(), 
            layerBounds.getMinY(), layerBounds.getMaxX(), layerBounds.getMaxY(), srs);
        Query query=new DefaultQuery(schema.getName().getLocalPart(), filter);


        return source.getFeatures(query);
    }

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        FeatureLocking<SimpleFeatureType, SimpleFeature> fl2;
        fl2 = (FeatureLocking<SimpleFeatureType, SimpleFeature>) rts.getFeatureSource(RENAMED);
        fl.setFeatureLock(lock);
        fl2.setTransaction(new DefaultTransaction());


        Query q = new DefaultQuery(RENAMED, fidFilter);
        assertEquals(1, fl.lockFeatures(q));
        assertEquals(0, fl2.lockFeatures(q));


        fl.unLockFeatures(q);
        assertEquals(1, fl2.lockFeatures(q));

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                GeometryFilter bboxFilter = fFac.createGeometryFilter(FilterType.GEOMETRY_INTERSECTS);
                bboxFilter.addLeftGeometry(fFac.createAttributeExpression(schema,
                        schema.getGeometryDescriptor().getName().getLocalPart()));
                bboxFilter.addRightGeometry(bboxExpression);


                Query bboxQuery = new DefaultQuery(schema.getTypeName(), bboxFilter);
                Query definitionQuery = layer.getQuery();
                DefaultQuery finalQuery = new DefaultQuery(DataUtilities.mixQueries(definitionQuery, bboxQuery, "svgEncoder"));
                finalQuery.setHints(definitionQuery.getHints());
                finalQuery.setSortBy(definitionQuery.getSortBy());
                finalQuery.setStartIndex(definitionQuery.getStartIndex());


                LOGGER.fine("obtaining FeatureReader for " + schema.getTypeName());
                featureReader = fSource.getFeatures(finalQuery).features();
                LOGGER.fine("got FeatureReader, now writing");

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                mapId = schema.getTypeName();


                writer.write("<map name=\"" + mapId + "\">\n");


              // 2) definition query filter
                Query definitionQuery = layer.getQuery();
                LOGGER.info("Definition Query: "+definitionQuery.toString());
                if (!definitionQuery.equals(Query.ALL)) {
                    if (q.equals(Query.ALL)) {
                        q = (DefaultQuery) definitionQuery;
                    } else {
                        q = (DefaultQuery) DataUtilities.mixQueries(definitionQuery, q, "HTMLImageMapEncoder");
                    }

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        DefaultQuery q = new DefaultQuery(schema.getTypeName());
        q.setFilter(filter);


        // now, if a definition query has been established for this layer,
        // be sure to respect it by combining it with the bounding box one.
        Query definitionQuery = layer.getQuery();


        if (definitionQuery != Query.ALL) {
            if (q == Query.ALL) {
                q = (DefaultQuery) definitionQuery;
            } else {
                q = (DefaultQuery) DataUtilities.mixQueries(definitionQuery, q,
                        "KMLEncoder");
            }
        }


        // handle startIndex requested by client query
        q.setStartIndex(definitionQuery.getStartIndex());


        // check the regionating strategy
        RegionatingStrategy regionatingStrategy = null;
        String stratname = (String) mapContext.getRequest().getFormatOptions()
                .get("regionateBy");

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                q.setFilter(filter);
                q.setPropertyNames(attributes);


                // now, if a definition query has been established for this layer, be
                // sure to respect it by combining it with the bounding box one.
                Query definitionQuery = layer.getQuery();


                if (definitionQuery != Query.ALL) {
                    if (q == Query.ALL) {
                        q = (DefaultQuery) definitionQuery;
                    } else {

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    }


    public FeatureCollection<SimpleFeatureType, SimpleFeature> getVersionedFeatures(Query query)
            throws IOException {
        final VersioningFeatureSource versioningSource = ((VersioningFeatureSource) source);
        Query newQuery = adaptQuery(query, versioningSource.getVersionedFeatures().getSchema());
        
        CoordinateReferenceSystem targetCRS = query.getCoordinateSystemReproject();
        try {
            //this is the raw "unprojected" feature collection

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