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 $URL$

            store = info;
        }
        else {
            HashMap map = new HashMap(params.raw());
            Map resolved = ResourcePool.getParams(map, cat.getResourceLoader() );
            DataAccess dataStore = DataAccessFinder.getDataStore(resolved);            
            if( dataStore == null ){
                throw new IllegalArgumentException("Connection parameters incomplete (does not match an available data store, coverage store or wms store).");
            }
            DataStoreInfo info = factory.createDataStore();
            info.setWorkspace(workspace);
            info.setType(name);
            info.getConnectionParameters().putAll(map);
            try {
                info.setDescription( dataStore.getInfo().getDescription());
                info.setEnabled(true);
            } catch (Throwable e) {
                info.setError(e);
                info.setEnabled(false);
            }

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    private JSONObj resource(JSONObj obj, StoreInfo store, String name, HttpServletRequest req) throws IOException {
        obj.put("name", name);
        if(store instanceof DataStoreInfo){
            DataStoreInfo data = (DataStoreInfo) store;
            
            @SuppressWarnings("rawtypes")
            DataAccess dataStore = data.getDataStore(new NullProgressListener());
            FeatureType schema;
            org.geotools.data.ResourceInfo info;
            if (dataStore instanceof DataStore) {
                schema = ((DataStore) dataStore).getSchema(name);
                info = ((DataStore) dataStore).getFeatureSource(name).getInfo();
            } else {
                NameImpl qname = new NameImpl(name);
                schema = dataStore.getSchema(qname);
                info = dataStore.getFeatureSource(qname).getInfo();
            }
            String title = info.getTitle() == null
                    ? WordUtils.capitalize(name)
                    : info.getTitle();
            String description = info.getDescription() == null ? "" : info.getDescription();

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        URL url = getClass().getResource(schemaBase + "GeologicUnit.xml");
        assertNotNull(url);
        dsParams.put("dbtype", "app-schema");
        dsParams.put("url", url.toExternalForm());


        DataAccess guDataStore = DataAccessFinder.getDataStore(dsParams);
        assertNotNull(guDataStore);
        FeatureType geologicUnitType = guDataStore.getSchema(FeatureChainingTest.GEOLOGIC_UNIT);
        assertNotNull(geologicUnitType);


        url = getClass().getResource(schemaBase + "MappedFeaturePropertyfile.xml");
        assertNotNull(url);


        dsParams.put("dbtype", "app-schema");
        dsParams.put("url", url.toExternalForm());
        DataAccess mfDataAccess = DataAccessFinder.getDataStore(dsParams);
        assertNotNull(mfDataAccess);


        FeatureSource guSource = (FeatureSource) guDataStore
                .getFeatureSource(FeatureChainingTest.GEOLOGIC_UNIT);

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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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            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");
                setResponsePage(StorePage.class);
                return;
            }

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                DataStoreInfo meta = (DataStoreInfo) i.next();
                DataStore dataStore = null;
                
                // TODO: support locking for DataAccess
                if (meta.isEnabled()) {
                    DataAccess da = meta.getDataStore(null);
                    if ( da instanceof DataStore ) {
                        dataStore = (DataStore) da;
                    }
                }

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                DataStoreInfo meta = (DataStoreInfo) i.next();
                DataStore dataStore = null;
                
                // TODO: support locking for DataAccess
                if (meta.isEnabled()) {
                    DataAccess da = meta.getDataStore(null);
                    if ( da instanceof DataStore ) {
                        dataStore = (DataStore) da;
                    }
                }

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                DataStoreInfo meta = (DataStoreInfo) i.next();
                DataStore dataStore = null;
                
                // TODO: support locking for DataAccess
                if (meta.isEnabled()) {
                    DataAccess da = meta.getDataStore(null);
                    if ( da instanceof DataStore ) {
                        dataStore = (DataStore) da;
                    }
                }

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                DataStoreInfo meta = (DataStoreInfo) i.next();
                DataStore dataStore = null;
                
                // TODO: support locking for DataAccess
                if (meta.isEnabled()) {
                    DataAccess da = meta.getDataStore(null);
                    if ( da instanceof DataStore ) {
                        dataStore = (DataStore) da;
                    }
                }

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        assertNotNull(info);


        assertEquals("GSS", info.getName());
        assertEquals(GSSMode.Unit, info.getMode());
        DataAccess storeCatalog = getCatalog().getStore("synchStore", DataStoreInfo.class)
                .getDataStore(null);
        DataAccess storeService = info.getVersioningDataStore().getDataStore(null);
        assertSame(storeCatalog, storeService);
    }

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Examples of org.geotools.data.DataAccess

Description

Contents

Lifecycle

Related Classes of org.geotools.data.DataAccess