Examples of org.geotools.data.DataAccess

org.geotools.data.DataAccess
This is the top-level interface for access to {@code FeatureData}.

Description
The DataAccess interface provides the following information about its contents:
- {@link DataAccess.getInfo()} - information about the file or server itself
- {@link DataAccess.getNames()} - list of the available contents (each is an individual resource)
- {@link DataAccess.getSchema( Name )} - FeatureType describing the information available in the named resource
Contents
You can access the contents of a service or file using getFeatureSource( Name ). Depending the abilities of your implementation and your credentials you will have access to
- {@link FeatureSource}: read-only api similar to the WFS getFeature operations. Please note the reutrned FeatureCollection may be *lazy*; for many implementations no actual access will occur until you use the FetaureCollection for the first time.
- {@link FeatureStore}: read/write api similar to the WFS Transaction operation. Batch changes such as addFeatures, modifyFeatures and removeFeatures are supported.
- {@link FeatureLocking}: concurrency control; the Data Access API is thread safe; one consequence of this is modifications being held up while other threads read the contents. You may wish to Lock a selection of features for your exclusive use. Locks are timed; and will expire after the indicated period.
Please note that all interaction occurs within the context of a Transaction, this facility provides session management and is strongly advised. Please note that your application is responsible for managing its own Transactions; as an example they are often associated with a single Map in a desktop application; or a single session in a J2EE web app.
The use of Transaction.AUTO_COMMIT is suitable for read-only access when you wish to minimize the number of connections in use, when used for writing performance will often be terrible.
Lifecycle
Normal use:
- Connect using a DataAccessFactory.createDataStore using a set of connection parameters
- Application is responsible for holding a single instance to the service or file, DataAccess implementations will hold onto database connections, internal caches and so on - and as such should not be duplicated.
- DataAccess.dispose() is called when the application is shut down
Creation:
- Created using a DataAccessFactory.createNewDataStore using a set of creation parameters
- DataAccess.createSchema( T ) is called to set up the contents
- DataAccess.getFetaureSource( Name ) is called, and FeatureStore.addFeatures( collection ) used to populate the contents
- DataAccess.dispose() is called when the application is shut down
Applications are responsible for holding a single instance to the service or file, The DataAccess implementations will hold onto database connections, internal caches and so on - and as such should not be duplicated. @see DataStore Subclass restricted to working with simple content @param < T> Type of Feature Content, may be SimpleFeatureType @param < F> Feature Content, may be SimpleFetaure @source $URL$

                    // Don't count locks from disabled datastores.
                    continue;
                }
    
                try {
                    DataAccess store = meta.getDataStore(null);
                    if(store instanceof DataStore) {
                        LockingManager lockingManager = ((DataStore) store).getLockingManager();
                        if (lockingManager != null){
                            // we can't actually *count* locks right now?
                            // count += lockingManager.getLockSet().size();

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    @Test
    public void testReadOnlyFeatureSourceDataAccess() throws Exception {
        // build the mock up
        DataAccess da = createNiceMock(DataAccess.class);
        replay(da);
        FeatureSource fs = createNiceMock(FeatureSource.class);
        expect(fs.getDataStore()).andReturn(da);
        replay(fs);

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                // Don't count locks from disabled datastores.
                continue;
            }


            try {
                DataAccess store = meta.getDataStore(null);
                if(store instanceof DataStore) {
                    LockingManager lockingManager = ((DataStore) store).getLockingManager();
                    if (lockingManager != null){
                        // we can't actually *count* locks right now?
                        // count += lockingManager.getLockSet().size();

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    public CatalogRepository(Catalog catalog) {
        this.catalog = catalog;
    }


    public DataStore dataStore(Name name) {
        DataAccess da = access(name);
        if ( da instanceof DataStore ) {
            return (DataStore) da;
        }
        
        LOGGER.severe( name + " is not a data store.");

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            if ( !ds.isEnabled() ) {
                continue;
            }
            
            try {
                DataAccess da = ds.getDataStore( null );
                if ( da instanceof DataStore ) {
                    dataStores.add( (DataStore) da );
                }
            } 
            catch (IOException e) {

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            if(virtualTable == null) {
                throw new IllegalArgumentException("The specified feature type does not have a sql view attached to it");
            }


            // get the store
            DataAccess da = store.getDataStore(null);
            if (!(da instanceof JDBCDataStore)) {
                error("Cannot create a SQL view if the store is not database based");
                doReturn(StorePage.class);
                return;
            }

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        // reset to default first, to avoid the container being displayed if store is not a
        // DataStoreInfo
        createSQLViewContainer.setVisible(false);
        if (store instanceof DataStoreInfo) {
            try {
                DataAccess da = ((DataStoreInfo) store).getDataStore(null);
                createSQLViewContainer.setVisible(da instanceof JDBCDataStore);
            } catch (IOException e) {
                LOGGER.log(Level.FINEST, e.getMessage());
            }
        }

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        }


        FeatureIterator<SimpleFeature> fi = null;
        try {
            // basic sanity checks on the datastore
            DataAccess ds = info.getVersioningDataStore().getDataStore(null);
            if (!(ds instanceof VersionedPostgisDataStore)) {
                throw new GSSException(
                        "The store attached to the gss module is not a PostGIS versioning one");
            }
            VersionedPostgisDataStore dataStore = (VersionedPostgisDataStore) ds;

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        DataAccessFactory f = getGeoServer().getCatalog().getResourcePool().getDataStoreFactory(info);
        
        assertNotNull( f );
        assertTrue( f instanceof PropertyDataStoreFactory );
        
        DataAccess store = getGeoServer().getCatalog().getResourcePool().getDataStore(info);
                
        assertEquals( testDS.toURI().toString().toLowerCase(), store.getInfo().getSource().toString().replace("/./", "/").toLowerCase());
    }

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    @SuppressWarnings("rawtypes")
    @Test
    public void testPutWithCalculation() throws Exception {
        DataStoreInfo dataStoreInfo = getCatalog().getDataStoreByName("sf","sf");
        String dataStoreId = dataStoreInfo.getId();
        DataAccess dataAccessBefore = dataStoreInfo.getDataStore(null);
        assertSame("ResourcePool DataStoreCache", dataAccessBefore, getCatalog().getResourcePool().getDataStoreCache().get( dataStoreId ));
        
        String clearLatLonBoundingBox =
              "<featureType>"
                + "<nativeBoundingBox>"
                  + "<minx>-180.0</minx>" + "<maxx>180.0</maxx>"
                  + "<miny>-90.0</miny>" + "<maxy>90.0</maxy>"
                  + "<crs>EPSG:4326</crs>" 
                + "</nativeBoundingBox>"
                + "<latLonBoundingBox/>"
            + "</featureType>";
        
        String path = "/rest/workspaces/sf/datastores/sf/featuretypes/PrimitiveGeoFeature";
        MockHttpServletResponse response =
                putAsServletResponse(path, clearLatLonBoundingBox, "text/xml");
        assertEquals("Couldn't remove lat/lon bounding box:\n" + response.getOutputStreamContent(),
                200, response.getStatusCode());


        Document dom = getAsDOM(path + ".xml");
        assertXpathEvaluatesTo("0.0", "/featureType/latLonBoundingBox/minx", dom);
        
        // confirm ResourcePoool cache of DataStore is unchanged
        DataAccess dataAccessAfter = getCatalog().getDataStoreByName("sf","sf").getDataStore(null);
        assertSame( "ResourcePool DataStoreCache check 1", dataAccessBefore, dataAccessAfter );
        assertSame("ResourcePool DataStoreCache", dataAccessBefore, getCatalog().getResourcePool().getDataStoreCache().get( dataStoreId ));
        
        String updateNativeBounds =
                "<featureType>"

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Examples of org.geotools.data.DataAccess

Description

Contents

Lifecycle

Related Classes of org.geotools.data.DataAccess