Examples of org.geotools.data.QueryCapabilities

org.geotools.data.QueryCapabilities
Describes the query capabilities for a specific FeatureType, so client code can request which features are natively supported by a FeatureSource.
This is the minimal Query capabilities we could come up in order to reliably support paging. Yet, the need for a more complete set of capabilities is well known and a new proposal should be done in order to define the complete set of capabilities a FeatureSource should advertise.
@author Gabriel Roldan (TOPP) @version $Id$ @since 2.5.x @source $URL$

     *      only if ALL backend feature sources support it
     */
    public QueryCapabilities getQueryCapabilities() {
        if (queryCapabilities != null)
            return queryCapabilities;
        queryCapabilities = new QueryCapabilities() {


            @Override
            public boolean isOffsetSupported() {
                try {
                    if (!getBaseFeatureSource().getQueryCapabilities().isOffsetSupported())

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    public Name getName() {
        return contents.getSchema().getName();
    }


    public QueryCapabilities getQueryCapabilities() {
        return new QueryCapabilities() {
            @Override
            public boolean isOffsetSupported() {
                return true;
            }
        };

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        txQuery.setPropertyNames(getRequiredAttributes(query));
        txQuery.setSortBy(getTransformedSortBy(query));
        txQuery.setFilter(txFilter);


        // can we support the required sorting?
        QueryCapabilities caps = source.getQueryCapabilities();
        if (query.getStartIndex() != null && !caps.isJoiningSupported()) {
            txQuery.setStartIndex(null);
        }
        if (query.getSortBy() != null && !caps.supportsSorting(query.getSortBy())) {
            txQuery.setSortBy(null);
        }


        // if the original query had sorting but we cannot pass it down we
        // have to remove offset and limit too
        if (query.getSortBy() != null && txQuery.getSortBy() == null) {
            txQuery.setStartIndex(null);
            txQuery.setMaxFeatures(Query.DEFAULT_MAX);
        }


        // if the wrapped store cannot apply offsets we have to remove them too
        if (!caps.isOffsetSupported()) {
            txQuery.setStartIndex(null);
        }


        return txQuery;
    }

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        return new SingleFeatureSourceDataStore(this);
    }


    @Override
    public QueryCapabilities getQueryCapabilities() {
        return new QueryCapabilities() {


            @Override
            public boolean isOffsetSupported() {
                return true;
            }

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        super(entry, query);
    }
    
    @Override
    protected QueryCapabilities buildQueryCapabilities() {
        return new QueryCapabilities(){
            public boolean isUseProvidedFIDSupported() {
                return true;
            }
        };
    }

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     * are advised to build their own.
     * @return
     * @throws IOException
     */
    protected QueryCapabilities buildQueryCapabilities() {
        return new QueryCapabilities();
    }

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            queryCapabilities = buildQueryCapabilities();
        }
        
        // we have to glaze the subclass query capabilities since we always support offset
        // and we support more sorting cases using the sorting wrappers
        return new QueryCapabilities() {
            public boolean isOffsetSupported() {
                // we always support offset since we support sorting
                return true;
            }

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    public WFSFeatureSource(final WFS_1_1_0_DataStore dataStore, final String typeName)
            throws IOException {
        this.typeName = typeName;
        this.dataStore = dataStore;
        this.queryCapabilities = new QueryCapabilities();
        this.featureType = dataStore.getSchema(typeName);
    }

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        fi.close();
    }
    
    public void testQueryCapabilitiesSort() throws Exception {
        FilterFactory ff = dataStore.getFilterFactory();
        QueryCapabilities caps = featureSource.getQueryCapabilities();
        
        // check we advertise support for sorting on basic attributes 
        assertTrue(caps.supportsSorting(new SortBy[] {ff.sort(aname("intProperty"), SortOrder.ASCENDING)}));
        assertTrue(caps.supportsSorting(new SortBy[] {ff.sort(aname("stringProperty"), SortOrder.DESCENDING)}));
        assertTrue(caps.supportsSorting(new SortBy[] {ff.sort(aname("doubleProperty"), SortOrder.ASCENDING)}));


        // but we cannot sort geometries
        assertFalse(caps.supportsSorting(new SortBy[] {ff.sort(aname("geometry"), SortOrder.ASCENDING)}));
    }

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        // but we cannot sort geometries
        assertFalse(caps.supportsSorting(new SortBy[] {ff.sort(aname("geometry"), SortOrder.ASCENDING)}));
    }
    
    public void testQueryCapabilitiesReliableFid() throws Exception {
        QueryCapabilities caps = featureSource.getQueryCapabilities();
        // we have a primary key, right?
        assertTrue(caps.isReliableFIDSupported());
    }

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