Class GeoPkgDialect

    • Method Detail

      • initializeConnection

        public void initializeConnection​(Connection cx)
                                  throws SQLException
        Description copied from class: SQLDialect
        Initializes a newly created database connection.

        Subclasses should override this method if there is some additional action that needs to be taken when a new connection to the database is created. The default implementation does nothing.

        Overrides:
        initializeConnection in class SQLDialect
        Parameters:
        cx - The new database connection.
        Throws:
        SQLException
      • setContentsOnly

        public void setContentsOnly​(boolean contentsOnly)
        Whether to return only tables listed as features in gpkg_contents, or give access to all other tables (careful, enabling this and then writing might cause the GeoPackage not to conform to spec any longer, use at your discretion)
        Parameters:
        contentsOnly -
      • includeTable

        public boolean includeTable​(String schemaName,
                                    String tableName,
                                    Connection cx)
                             throws SQLException
        Description copied from class: SQLDialect
        Determines if the specified table should be included in those published by the datastore.

        This method returns true if the table should be published as a feature type, otherwise it returns false. Subclasses should override this method, this default implementation returns true.

        A database connection is provided to the dialect but it should not be closed. However any statements objects or result sets that are instantiated from it must be closed.

        Overrides:
        includeTable in class SQLDialect
        Parameters:
        schemaName - The schema of the table, might be null..
        tableName - The name of the table.
        cx - Database connection.
        Throws:
        SQLException
      • encodePrimaryKey

        public void encodePrimaryKey​(String column,
                                     StringBuffer sql)
        Description copied from class: SQLDialect
        Encodes the primary key definition in a CREATE TABLE statement.

        Subclasses should override this method if need be, the default implementation does the following:

           
           encodeColumnName( column, sql );
           sql.append( " int PRIMARY KEY" );
           
         
        Overrides:
        encodePrimaryKey in class SQLDialect
      • encodeGeometryEnvelope

        public void encodeGeometryEnvelope​(String tableName,
                                           String geometryColumn,
                                           StringBuffer sql)
        Description copied from class: SQLDialect
        Encodes the spatial extent function of a geometry column in a SELECT statement.

        This method must also be sure to properly encode the name of the column with the #encodeColumnName(String, StringBuffer) function.

        Specified by:
        encodeGeometryEnvelope in class SQLDialect
      • decodeGeometryValue

        public Geometry decodeGeometryValue​(GeometryDescriptor descriptor,
                                            ResultSet rs,
                                            String column,
                                            GeometryFactory factory,
                                            Connection cx,
                                            Hints hints)
                                     throws IOException,
                                            SQLException
        Description copied from class: SQLDialect
        Decodes a geometry value from the result of a query.

        This method is given direct access to a result set. The column parameter is the index into the result set which contains the geometric value.

        An implementation should deserialize the value provided by the result set into Geometry object. For example, consider an implementation which deserializes from well known text:

           String wkt = rs.getString( column );
           if ( wkt == null ) {
             return null;
           }
           return new WKTReader(factory).read( wkt );
           
        Note that implementations must handle null values.

        The factory parameter should be used to instantiate any geometry objects.

        Specified by:
        decodeGeometryValue in class SQLDialect
        Throws:
        IOException
        SQLException
      • registerSqlTypeNameToClassMappings

        public void registerSqlTypeNameToClassMappings​(Map<String,​Class<?>> mappings)
        Description copied from class: SQLDialect
        Registers the sql type name to java type mappings that the dialect uses when reading and writing objects to and from the database.

        Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation. This implementation provides the following mappings:

        Overrides:
        registerSqlTypeNameToClassMappings in class SQLDialect
      • registerClassToSqlMappings

        public void registerClassToSqlMappings​(Map<Class<?>,​Integer> mappings)
        Description copied from class: SQLDialect
        Registers the java type to sql type mappings that the datastore uses when reading and writing objects to and from the database. *

        Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation. This implementation provides the following mappings:

        Overrides:
        registerClassToSqlMappings in class SQLDialect
      • registerSqlTypeToSqlTypeNameOverrides

        public void registerSqlTypeToSqlTypeNameOverrides​(Map<Integer,​String> overrides)
        Description copied from class: SQLDialect
        Registers any overrides that should occur when mapping an integer sql type value to an underlying sql type name.

        The default implementation of this method does nothing. Subclasses should override in cases where:

        • database type metadata does not provide enough information to properly map
        • to support custom types (those not in Types)
        Overrides:
        registerSqlTypeToSqlTypeNameOverrides in class SQLDialect
      • getRestrictions

        public Filter getRestrictions​(ResultSet columns,
                                      Connection cx)
                               throws SQLException
        Description copied from class: SQLDialect
        Allows the dialect to setup restrictions for attribute at hand
        Overrides:
        getRestrictions in class SQLDialect
        Parameters:
        columns - The column metadata
        cx - The connection used to retrieve the metadata
        Returns:
        The restriction, or null if no restriction applies
        Throws:
        SQLException
      • postCreateTable

        public void postCreateTable​(String schemaName,
                                    SimpleFeatureType featureType,
                                    Connection cx)
                             throws SQLException,
                                    IOException
        Description copied from class: SQLDialect
        Callback to execute any additional sql statements post a create table statement.

        This method should be implemented by subclasses that need to do some post processing on the database after a table has been created. Examples might include:

        • Creating a sequence for a primary key
        • Registering geometry column metadata
        • Creating a spatial index

        A common case is creating an auto incrementing sequence for the primary key of a table. It should be noted that all tables created through the datastore use the column "fid" as the primary key.

        A direct connection to the database is provided (cx). This connection must not be closed, however any statements or result sets instantiated from the connection must be closed.

        Overrides:
        postCreateTable in class SQLDialect
        Parameters:
        schemaName - The name of the schema, may be null.
        featureType - The feature type that has just been created on the database.
        cx - Database connection.
        Throws:
        SQLException
        IOException
      • postDropTable

        public void postDropTable​(String schemaName,
                                  SimpleFeatureType featureType,
                                  Connection cx)
                           throws SQLException
        Description copied from class: SQLDialect
        Callback which executes after a table has been dropped.

        This base implementation does nothing, subclasses should override as need be.

        Overrides:
        postDropTable in class SQLDialect
        Parameters:
        schemaName - The database schema containing the table.
        featureType - The featureType/table being dropped.
        cx - The database connection.
        Throws:
        SQLException
      • getGeometrySRID

        public Integer getGeometrySRID​(String schemaName,
                                       String tableName,
                                       String columnName,
                                       Connection cx)
                                throws SQLException
        Description copied from class: SQLDialect
        Returns the spatial reference system identifier (srid) for a particular geometry column.

        This method is given a direct connection to the database. The connection must not be closed. However any statements or result sets instantiated from the connection must be closed.

        In the event that the srid cannot be determined, this method should return null .

        Overrides:
        getGeometrySRID in class SQLDialect
        Parameters:
        schemaName - The database schema, could be null.
        tableName - The table, never null.
        columnName - The column name, never null
        cx - The database connection.
        Throws:
        SQLException
      • getGeometryDimension

        public int getGeometryDimension​(String schemaName,
                                        String tableName,
                                        String columnName,
                                        Connection cx)
                                 throws SQLException
        Description copied from class: SQLDialect
        Returns the dimension of the coordinates in the geometry. Defaults to 2, subclasses can override it.

        This method is given a direct connection to the database. The connection must not be closed. However any statements or result sets instantiated from the connection must be closed.

        In the event that the dimension cannot be determined, this method should return 2

        Overrides:
        getGeometryDimension in class SQLDialect
        Parameters:
        schemaName - The database schema, could be null.
        tableName - The table, never null.
        columnName - The column name, never null
        cx - The database connection.
        Throws:
        SQLException
      • createCRS

        public CoordinateReferenceSystem createCRS​(int srid,
                                                   Connection cx)
                                            throws SQLException
        Description copied from class: SQLDialect
        Turns the specified srid into a CoordinateReferenceSystem, or returns null if not possible.

        Note this implementation takes account of SQLDialect.forceLongitudeFirst which should be set when longitude first (XY) axis ordering is required.

        The implementation might just use CRS.decode("EPSG:" + srid), but most spatial databases will have their own SRS database that can be queried as well.

        As a rule of thumb you should override this method if your spatial database uses codes that are not part of the EPSG standard database, of if for some reason you deem it preferable to use your database definition instead of an official EPSG one.

        Most overrides will try out to decode the official EPSG code first, and fall back on the custom database definition otherwise

        Overrides:
        createCRS in class SQLDialect
        Throws:
        SQLException
      • getLastAutoGeneratedValue

        public Object getLastAutoGeneratedValue​(String schemaName,
                                                String tableName,
                                                String columnName,
                                                Connection cx)
                                         throws SQLException
        Description copied from class: SQLDialect
        Obtains the last value of an auto generated column.

        This method is only called when SQLDialect.lookupGeneratedValuesPostInsert() returns true. Implementations should determine the previous value of a column for which was automatically generated by the database.

        This method is given a direct connection to the database, but this connection should never be closed. However any statements or result sets instantiated from the connection must be closed.

        Implementations should handle the case where schemaName is null.

        Overrides:
        getLastAutoGeneratedValue in class SQLDialect
        Parameters:
        schemaName - The schema name, this might be null.
        tableName - The name of the table.
        columnName - The column.
        cx - The database connection.
        Returns:
        The previous value of the column, or null.
        Throws:
        SQLException
      • applyLimitOffset

        public void applyLimitOffset​(StringBuffer sql,
                                     int limit,
                                     int offset)
        Description copied from class: SQLDialect
        Alters the query provided so that limit and offset are natively dealt with. This might mean simply appending some extra directive to the query, or wrapping it into a bigger one.
        Overrides:
        applyLimitOffset in class SQLDialect
      • setValue

        public void setValue​(Object value,
                             Class binding,
                             PreparedStatement ps,
                             int column,
                             Connection cx)
                      throws SQLException
        Description copied from class: PreparedStatementSQLDialect
        Sets a value in a prepared statement, for "basic types" (non-geometry).

        Subclasses should override this method if they need to do something custom or they wish to support non-standard types.

        Overrides:
        setValue in class PreparedStatementSQLDialect
        Parameters:
        value - the value.
        binding - The class of the value.
        ps - The prepared statement.
        column - The column the value maps to.
        cx - The database connection.
        Throws:
        SQLException
      • encodeColumnType

        public void encodeColumnType​(String sqlTypeName,
                                     StringBuffer sql)
        Description copied from class: SQLDialect
        Encodes the type of a column in an SQL CREATE TABLE statement.

        The default implementation simply outputs the sqlTypeName argument as is. Subclasses may override this method. Such cases might include:

        • A type definition requires some parameter, ex: size of a varchar
        • The provided attribute (att) contains some additional restrictions that can be encoded in the type, ex: field length
        Overrides:
        encodeColumnType in class SQLDialect
      • postCreateAttribute

        public void postCreateAttribute​(AttributeDescriptor att,
                                        String tableName,
                                        String schemaName,
                                        Connection cx)
                                 throws SQLException
        Description copied from class: SQLDialect
        Callback which executes after an attribute descriptor has been built from a table column.

        The result set columnMetadata should not be modified in any way (including scrolling) , it should only be read from.

        This base implementation does nothing, subclasses should override as need be.

        Overrides:
        postCreateAttribute in class SQLDialect
        Parameters:
        att - The built attribute descriptor.
        tableName - The name of the table containing the column
        schemaName - The name of the database scheam containing the table containing the column
        cx - The database connection.
        Throws:
        SQLException
      • splitFilter

        public Filter[] splitFilter​(Filter filter,
                                    SimpleFeatureType schema)
        Description copied from class: SQLDialect
        Splits the filter into two parts, an encodable one, and a non encodable one. The default implementation uses the filter capabilities to split the filter, subclasses can implement their own logic if need be.
        Overrides:
        splitFilter in class SQLDialect
      • getSQLType

        public Integer getSQLType​(AttributeDescriptor ad)
        Description copied from class: SQLDialect
        Gives an opportunity to the dialect to do its own custom type mapping, based on the full description of the attribute. Defaults to return null, subclasses can override
        Overrides:
        getSQLType in class SQLDialect
        Parameters:
        ad - The attribute descriptor
        Returns:
        A SQL type from Types, or null if customization is needed
      • getOptimizedBounds

        public List<ReferencedEnvelope> getOptimizedBounds​(String schema,
                                                           SimpleFeatureType featureType,
                                                           Connection cx)
                                                    throws SQLException,
                                                           IOException
        Description copied from class: SQLDialect
        Returns the bounds of all geometry columns in the layer using any approach that proves to be faster than the plain bounds aggregation (e.g., better than the "plain select extent(geom) from table" on PostGIS), or null if none exists or the fast method has not been enabled (e.g., if the fast method is just an estimate of the bounds you probably want the user to enable it manually)
        Overrides:
        getOptimizedBounds in class SQLDialect
        Parameters:
        schema - The database schema, if any, or null
        featureType - The feature type containing the geometry columns whose bounds need to computed. Mind, it may be retyped and thus contain less geometry columns than the table
        Returns:
        a list of referenced envelopes (some of which may be null or empty)
        Throws:
        SQLException
        IOException
      • convertValue

        public Object convertValue​(Object value,
                                   AttributeDescriptor ad)
        Description copied from class: SQLDialect
        Convertes the given value to the target type. The default implementation uses converters to match the attribute descriptor binding, subclasses can override.
        Overrides:
        convertValue in class SQLDialect
      • canGroupOnGeometry

        public boolean canGroupOnGeometry()
        Description copied from class: SQLDialect
        Returns true if this database can "group by" on a Geometry column. Defaults to false, specific implementations with this capability should override
        Overrides:
        canGroupOnGeometry in class SQLDialect