Package org.geotools.geopkg

Class GeoPkgDialect

Object
SQLDialect
PreparedStatementSQLDialect
GeoPkgDialect
public class GeoPkgDialect extends PreparedStatementSQLDialect
The GeoPackage SQL Dialect.
Author:
Justin Deoliveira, Niels Charlier

  • Field Details

  • Constructor Details

  • Method Details

    • 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

    • decodeGeometryEnvelope

      public Envelope decodeGeometryEnvelope(ResultSet rs, int column, Connection cx) throws SQLException, IOException
      Description copied from class: SQLDialect
      Decodes the result of a spatial extent function in a SELECT statement.

      This method is given direct access to a result set. The column parameter is the index into the result set which contains the spatial extent value. The query for this value is build with the SQLDialect.encodeGeometryEnvelope(String, String, StringBuffer) method.

      This method must not read any other objects from the result set other then the one referenced by column.

      Specified by:
      decodeGeometryEnvelope in class SQLDialect
      Parameters:
      rs - A result set
      column - Index into the result set which points at the spatial extent value.
      cx - The database connection.
      Throws:
      SQLException
      IOException

    • 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

    • decodeGeometryValue

      public Geometry decodeGeometryValue(GeometryDescriptor descriptor, ResultSet rs, int 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 specifying the column as an index.

      See #decodeGeometryValue(GeometryDescriptor, ResultSet, String, GeometryFactory) for a more in depth description.

      Overrides:
      decodeGeometryValue in class SQLDialect
      Throws:
      IOException
      SQLException

    • setGeometryValue

      public void setGeometryValue(Geometry g, int dimension, int srid, Class binding, PreparedStatement ps, int column) throws SQLException
      Description copied from class: PreparedStatementSQLDialect
      Sets the geometry value into the prepared statement.
      Specified by:
      setGeometryValue in class PreparedStatementSQLDialect
      Parameters:
      g - The geometry
      srid - the geometry native srid (should be forced into the encoded geometry)
      binding - the geometry type
      ps - the prepared statement
      column - the column index where the geometry is to be set
      Throws:
      SQLException

    • getGeometryTypeName

      public String getGeometryTypeName(Integer type)
      Description copied from class: SQLDialect
      Returns the name of a geometric type based on its integer constant.

      The constant, type, is registered in SQLDialect.registerSqlTypeNameToClassMappings(Map).

      This default implementation returns null, subclasses should override.

      Overrides:
      getGeometryTypeName in class SQLDialect

    • 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

    • getMapping

      public Class<?> getMapping(ResultSet columns, Connection cx) throws SQLException
      Description copied from class: SQLDialect
      Determines the class mapping for a particular column of a table.

      Implementing this method is optional. It is used to allow database to perform custom type mappings based on various column metadata. It is called before the mappings registered in SQLDialect.registerSqlTypeToClassMappings(Map) and are used to determine the mapping. Subclasses should implement as needed, this default implementation returns <code>null</code>. </p> <p> The <tt>columnMetaData</tt> argument is provided from {@link DatabaseMetaData#getColumns(String, String, String, String)}. </p>

      Overrides:
      getMapping in class SQLDialect
      Parameters:
      columns - The column metadata
      cx - The connection used to retrieve the metadata
      Returns:
      The class mapped to the to column, or null.
      Throws:
      SQLException

    • 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

    • lookupGeneratedValuesPostInsert

      public boolean lookupGeneratedValuesPostInsert()
      Description copied from class: SQLDialect
      Controls whether keys are looked up post or pre insert.

      When a row is inserted into a table, and a key is automatically generated it can be looked up before the insert occurs, or after the insert has been made. Returning false will cause the lookup to occur before the insert via SQLDialect.getNextAutoGeneratedValue(String, String, String, Connection). Returning true will cause the lookup to occur after the insert via SQLDialect.getLastAutoGeneratedValue(String, String, String, Connection).

      Subclasses returning false should implement:

      Subclasses returning true should implement:

      Overrides:
      lookupGeneratedValuesPostInsert in class SQLDialect

    • 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

    • isLimitOffsetSupported

      public boolean isLimitOffsetSupported()
      Description copied from class: SQLDialect
      Returns true if this dialect can encode both Query.getStartIndex() and Query.getMaxFeatures() into native SQL.
      Overrides:
      isLimitOffsetSupported in class SQLDialect

    • 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

    • createPreparedFilterToSQL

      public PreparedFilterToSQL createPreparedFilterToSQL()
      Overrides:
      createPreparedFilterToSQL in class PreparedStatementSQLDialect

    • setValue

      public void setValue(Object value, Class<?> binding, AttributeDescriptor att, 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.
      att - Optionally the descriptor of the respective attribute to provide native type information.
      ps - The prepared statement.
      column - The column the value maps to.
      cx - The database connection.
      Throws:
      SQLException

    • setArrayValue

      public void setArrayValue(Object value, AttributeDescriptor att, PreparedStatement ps, int columnIdx, Connection cx) throws SQLException
      Description copied from class: PreparedStatementSQLDialect
      Sets a value in a prepared statement, for the specific case of Array

      This method uses the standard SQL Array handling, subclasses can override to add special behavior

      Overrides:
      setArrayValue in class PreparedStatementSQLDialect
      Parameters:
      value - the value.
      att - The full attribute description
      ps - The prepared statement.
      columnIdx - The column the value maps to.
      cx - The database connection.
      Throws:
      SQLException

    • isArray

      public boolean isArray(AttributeDescriptor att)
      Description copied from class: SQLDialect
      Returns true if the attribute in question is an array. By default comparers the JDBCDataStore.JDBC_NATIVE_TYPE stored in the attribute user data with Types.ARRAY, but subclasses can override to use a different approach.
      Overrides:
      isArray in class SQLDialect

    • 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

    • getPrimaryKey

      protected PrimaryKey getPrimaryKey(String typeName) throws IOException
      Overrides:
      getPrimaryKey in class SQLDialect
      Throws:
      IOException

    • convert

      protected <T> T convert(Object value, Class<T> binding)
      Overrides:
      convert in class PreparedStatementSQLDialect

    • getPkColumnValue

      public String getPkColumnValue(ResultSet rs, PrimaryKeyColumn pkey, int columnIdx) throws SQLException
      Description copied from class: SQLDialect
      Reads a primary key column value. By default uses ResultSet.getString(int), subclasses can use a more efficient way should they wish to
      Overrides:
      getPkColumnValue in class SQLDialect
      Throws:
      SQLException

    • addSupportedHints

      protected void addSupportedHints(Set<Hints.Key> hints)
      Description copied from class: SQLDialect
      Add hints to the JDBC Feature Source. A subclass can override

      possible hints (but not limited to)

      Hints.GEOMETRY_GENERALIZATION Hints.GEOMETRY_SIMPLIFICATION

      Overrides:
      addSupportedHints in class SQLDialect

    • getAggregateConverter

      public Function<Object,Object> getAggregateConverter(FeatureVisitor visitor, SimpleFeatureType featureType)
      SQLite dates are just strings, they don't get converted to Date in case of aggregation, do it here instead
      Overrides:
      getAggregateConverter in class SQLDialect
      Returns:

    • 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