Package org.geotools.data.ogr

Class OGRDataStoreFactory

    • Constructor Detail

      • OGRDataStoreFactory

        public OGRDataStoreFactory()

    • Method Detail

      • createOGR

        protected abstract OGR createOGR()

      • canProcess

        public boolean canProcess​(Map<String,​?> params)
        Description copied from interface: DataAccessFactory
        Test to see if this factory is suitable for processing the data pointed to by the params map.

        If this datasource requires a number of parameters then this mehtod should check that they are all present and that they are all valid. If the datasource is a file reading data source then the extentions or mime types of any files specified should be checked. For example, a Shapefile datasource should check that the url param ends with shp, such tests should be case insensative.

        Specified by:
        canProcess in interface DataAccessFactory
        Parameters:
        params - The full set of information needed to construct a live data source.
        Returns:
        booean true if and only if this factory can process the resource indicated by the param set and all the required params are pressent.

      • createDataStore

        public DataStore createDataStore​(Map<String,​?> params)
                          throws IOException
        Description copied from interface: DataStoreFactorySpi
        Construct a live data source using the params specifed.

        You can think of this as setting up a connection to the back end data source.

        Magic Params: the following params are magic and are honoured by convention by the GeoServer and uDig application.

        • "user": is taken to be the user name
        • "passwd": is taken to be the password
        • "namespace": is taken to be the namespace prefix (and will be kept in sync with GeoServer namespace management.
        When we eventually move over to the use of OpperationalParam we will have to find someway to codify this convention.
        Specified by:
        createDataStore in interface DataAccessFactory
        Specified by:
        createDataStore in interface DataStoreFactorySpi
        Parameters:
        params - The full set of information needed to construct a live data store. Typical key values for the map include: url - location of a resource, used by file reading datasources. dbtype - the type of the database to connect to, e.g. postgis, mysql
        Returns:
        The created DataStore, this may be null if the required resource was not found or if insufficent parameters were given. Note that canProcess() should have returned false if the problem is to do with insuficent parameters.
        Throws:
        IOException - if there were any problems setting up (creating or connecting) the datasource.

      • getDisplayName

        public String getDisplayName()
        Description copied from interface: DataAccessFactory
        Name suitable for display to end user.

        A non localized display name for this data store type.

        Specified by:
        getDisplayName in interface DataAccessFactory
        Returns:
        A short name suitable for display in a user interface.

      • getDescription

        public String getDescription()
        Describes the type of data the datastore returned by this factory works with.
        Specified by:
        getDescription in interface DataAccessFactory
        Returns:
        String a human readable description of the type of restore supported by this datastore.

      • isAvailable

        public final boolean isAvailable()
        Test to see if this datastore is available, if it has all the appropriate libraries to construct a datastore.
        Specified by:
        isAvailable in interface DataAccessFactory
        Returns:
        true if and only if this factory is available to create DataStores.
        TODO:
        REVISIT: I'm just adding this method to compile, maintainer should revisit to check for any libraries that may be necessary for datastore creations.

      • isAvailable

        public final boolean isAvailable​(boolean handleError)
        Performs the available test specifying how to handle errors.

        Specifying true for handleError will cause any exceptions to be caught and logged, and return false

      • doIsAvailable

        protected abstract boolean doIsAvailable()
                                  throws Throwable
        Performs the actual test to see if the OGR library and this datastore is available.

        Implementations of this method should not attempt to handle any fatal exceptions.

        Throws:
        Throwable

      • canProcess

        public boolean canProcess​(String ogrName,
                          String driverName)
        Assume we can process an ogrName if the ogrName exists and can be opened, or if the specified driver does exist.

      • getAvailableDrivers

        public Set<String> getAvailableDrivers()

      • getImplementationHints

        public Map<RenderingHints.Key,​?> getImplementationHints()
        Description copied from interface: Factory
        Map of hints (maybe unmodifiable) used by this factory to customize its use. This map is not guaranteed to contains all the hints supplied by the user; it may be only a subset. Consequently, hints provided here are usually not suitable for creating new factories, unless the implementation make some additional garantees.

        The primary purpose of this method is to determine if an existing factory instance can be reused for a set of user-supplied hints. This method is invoked by FactoryRegistry in order to compare this factory's hints against user's hints. This is dependency introspection only; FactoryRegistry never invokes this method for creating new factories.

        Keys are usually static constants from the Hints class, while values are instances of some key-dependent class. The key set must contains at least all hints impacting functionality. While the key set may contains all hints supplied by the user, it is recommended to limit the set to only the hints used by this particular factory instance. A minimal set will helps FactoryRegistry to compare only hints that matter and avoid the creation of unnecessary instances of this factory.

        The hint values may be different than the one supplied by the user. If a user supplied a hint as a Class object, this method shall replace it by the actual instance used, if possible.

        Implementations of this method are usually quite simple. For example if a datum authority factory uses an ordinary datum factory, its method could be implemented as below (note that we should not check if the datum factory is null, since key with null value is the expected behaviour in this case). Example: 

        
 Map hints = new HashMap();
 hints.put(Hints.DATUM_FACTORY, datumFactory);
 return hints;
        Specified by:
        getImplementationHints in interface Factory
        Returns:
        The map of hints, or an {@linkplain java.util.Collections.emptyMap() empty map} if none.