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 $URL$

        if( catalog.getResourcePool().getFeatureTypeAttributeCache().containsKey( featureTypeId ) ){
             List<AttributeTypeInfo> attributesList = catalog.getResourcePool().getFeatureTypeAttributeCache().get( featureTypeId );
             assertNull( "attributes cleared", attributesList );
        }
        if( catalog.getResourcePool().getDataStoreCache().containsKey( dataStoreId ) ){
            DataAccess dataStore = catalog.getResourcePool().getDataStoreCache().get( dataStoreId );
            List<String> names = dataStore.getNames();
            assertTrue( names.contains("PrimativeGeoFeature"));
        }
    }

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        }
        featureType.setEnabled(true);
        
        // now, does the feature type exist? If not, create it
        DataStoreInfo ds = catalog.getDataStoreByName( workspace, dataStore );
        DataAccess gtda = ds.getDataStore(null);
        if (gtda instanceof DataStore) {
            String typeName = featureType.getName();
            if(featureType.getNativeName() != null) {
                typeName = featureType.getNativeName(); 
            } 
            boolean typeExists = false;
            DataStore gtds = (DataStore) gtda;
            for(String name : gtds.getTypeNames()) {
                if(name.equals(typeName)) {
                    typeExists = true;
                    break;
                }
            }


            //check to see if this is a virtual JDBC feature type
            MetadataMap mdm = featureType.getMetadata();
            boolean virtual = mdm != null && mdm.containsKey(FeatureTypeInfo.JDBC_VIRTUAL_TABLE);


            if(!virtual && !typeExists) {
                gtds.createSchema(buildFeatureType(featureType));
                // the attributes created might not match up 1-1 with the actual spec due to
                // limitations of the data store, have it re-compute them
                featureType.getAttributes().clear();
                List<String> typeNames = Arrays.asList(gtds.getTypeNames());
                // handle Oracle oddities
                // TODO: use the incoming store capabilites API to better handle the name transformation
                if(!typeNames.contains(typeName) && typeNames.contains(typeName.toUpperCase())) {
                    featureType.setNativeName(featureType.getName().toLowerCase());
                }
            }
        }
        
        CatalogBuilder cb = new CatalogBuilder(catalog);
        cb.initFeatureType( featureType );


        //attempt to fill in metadata from underlying feature source
        try {
            FeatureSource featureSource = 
                    gtda.getFeatureSource(new NameImpl(featureType.getNativeName()));
            if (featureSource != null) {
                cb.setupMetadata(featureType, featureSource);
            }
        }
        catch(Exception e) {

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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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Examples of org.geotools.data.DataAccess

Description

Contents

Lifecycle

Related Classes of org.geotools.data.DataAccess