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 $Id$

            throw (RuntimeException) new RuntimeException( ).initCause( e );
        }
        this.query = query;
    }
    public Data(final IGeoResource resource) {
        this( resource, new Query());
    }

View Full Code Here

    public void op( Display display, Object target, IProgressMonitor monitor ) throws Exception {
        final ILayer layer = (ILayer) target;
        final IMap map = layer.getMap();


        //get all selected features
        Query query = new DefaultQuery(layer.getSchema().getTypeName(), layer.getFilter());
        
        FeatureSource<SimpleFeatureType, SimpleFeature> featureSource = layer.getResource(FeatureSource.class, new SubProgressMonitor(monitor, 1)); 
        FeatureCollection<SimpleFeatureType, SimpleFeature>  features = featureSource.getFeatures(query);
        
        //combine them into one large polygon

View Full Code Here

                return false;
            }
            return true;
        }
        else if (value instanceof Query ){
            Query query = (Query) value;
            if( query == Query.ALL ){
                return false;                
            }
            if( query.getFilter() == Filter.INCLUDE && query.getPropertyNames() == Query.ALL_NAMES ){
                return false;
            }
            if( Query.ALL.equals(query)){
                return false;
            }

View Full Code Here

                            ProgressManager.instance().get());
                    if (ds == null){
                        return resource; // not a datastore give up!
                    }
                    String typeName = resource.getSchema().getTypeName();
                    Query query;


                    if (prop instanceof Filter) {
                        query = new Query(typeName, (Filter) prop);
                    } else {
                        query = (Query) prop;
                    }
                    if( !layer.getStyleBlackboard().contains(KEY) ){
                        layer.getStyleBlackboard().put(KEY, query);
                    }


                    if (!typeName.equals(query.getTypeName())) {
                        query = createQuery(query.getFilter(), query
                                .getCoordinateSystem(), query
                                .getCoordinateSystemReproject(), query
                                .getHandle(), query.getMaxFeatures(), query
                                .getNamespace(), query.getPropertyNames(),
                                typeName);
                    }
                    // provide our own default view wrapper (will be required in GeoTools 2.7)
                    SimpleFeatureSource view = new DefaultView((SimpleFeatureSource) resource, query);

View Full Code Here


    private static Query createQuery(Filter filter,
            CoordinateReferenceSystem crs, CoordinateReferenceSystem reproject,
            String handle, Integer maxFeature, URI namespace,
            String[] propertyNames, String typeName) {
        Query query = new Query();
        if (namespace != null) {
            query = new Query(typeName, namespace, filter, maxFeature,
                    propertyNames, handle);
        }
        if (crs != null) {
            query.setCoordinateSystem(crs);
        }
        if (reproject != null) {
            query.setCoordinateSystemReproject(reproject);
        }
        if (filter != null) {
            query.setFilter(filter);
        }
        if (handle != null) {
            query.setHandle(handle);
        }
        if (maxFeature != null) {
            query.setMaxFeatures(maxFeature);
        }
        if (propertyNames != null) {
            query.setPropertyNames(propertyNames);
        }
        if (typeName != null) {
            query.setTypeName(typeName);
        }
        return query;
    }

View Full Code Here

                return false;
            }
            return true;
        }
        else if (value instanceof Query ){
            Query query = (Query) value;
            if( query == Query.ALL ){
                return false;                
            }
            if( query.getFilter() == Filter.INCLUDE && query.getPropertyNames() == Query.ALL_NAMES ){
                return false;
            }
            if( Query.ALL.equals(query)){
                return false;
            }

View Full Code Here

                            ProgressManager.instance().get());
                    if (ds == null){
                        return resource; // not a datastore give up!
                    }
                    String typeName = resource.getSchema().getTypeName();
                    Query query;


                    if (prop instanceof Filter) {
                        query = new Query(typeName, (Filter) prop);
                    } else {
                        query = (Query) prop;
                    }
                    if( !layer.getStyleBlackboard().contains(KEY) ){
                        layer.getStyleBlackboard().put(KEY, query);
                    }


                    if (!typeName.equals(query.getTypeName())) {
                        query = createQuery(query.getFilter(), query
                                .getCoordinateSystem(), query
                                .getCoordinateSystemReproject(), query
                                .getHandle(), query.getMaxFeatures(), query
                                .getNamespace(), query.getPropertyNames(),
                                typeName);
                    }
                    // provide our own default view wrapper (will be required in GeoTools 2.7)
                    SimpleFeatureSource view = new DefaultView((SimpleFeatureSource) resource, query);

View Full Code Here


    private static Query createQuery(Filter filter,
            CoordinateReferenceSystem crs, CoordinateReferenceSystem reproject,
            String handle, Integer maxFeature, URI namespace,
            String[] propertyNames, String typeName) {
        Query query = new Query();
        if (namespace != null) {
            query = new Query(typeName, namespace, filter, maxFeature,
                    propertyNames, handle);
        }
        if (crs != null) {
            query.setCoordinateSystem(crs);
        }
        if (reproject != null) {
            query.setCoordinateSystemReproject(reproject);
        }
        if (filter != null) {
            query.setFilter(filter);
        }
        if (handle != null) {
            query.setHandle(handle);
        }
        if (maxFeature != null) {
            query.setMaxFeatures(maxFeature);
        }
        if (propertyNames != null) {
            query.setPropertyNames(propertyNames);
        }
        if (typeName != null) {
            query.setTypeName(typeName);
        }
        return query;
    }

View Full Code Here

            // what is compatible? Do the attribute names and types have to be the same or
            // just the types.
            // Executive decision:
            // Match both name and type, the rest must be customized.
            final HashMap<String, String> attributeMap = new HashMap<String, String>();
            Query query = createQuery(sourceLayer, filter, targetLayer, attributeMap);
            if (attributeMap.isEmpty()) {
                targetLayer.setFilter(filter);
                return;
            }
            MathTransform mt = createMathTransform(sourceLayer, targetLayer);

View Full Code Here

            } else {
                propertyNames = Query.ALL_NAMES;
            }
            String typeName = decode(memento.getString(TYPENAME));


            Query query = createQuery(filter, crs, reproject, handle,
                    maxFeature, namespace, propertyNames, typeName);
            return query;
        }

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of org.geotools.data.Query

mil.nga.giat.geowave.vector.plugin.ExtractTimeFilterVisitorTest

mil.nga.giat.geowave.vector.plugin.GeoWaveFeatureSourceTest

org.geoserver.feature.retype.FullyRetypingDataStoreTest

org.geoserver.feature.retype.RetypingDataStore

org.geoserver.feature.retype.RetypingDataStoreTest

org.geoserver.feature.retype.RetypingFeatureSource

org.geoserver.python.datastore.PythonDataStoreTest

org.geoserver.security.decorators.SecuredFeatureLocking

org.geoserver.security.decorators.SecuredFeatureSource

org.geoserver.security.decorators.SecuredFeatureStore

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.