org.geotools.data.jdbc.fidmapper
Class NullFIDMapper

java.lang.Object
  org.geotools.data.jdbc.fidmapper.AbstractFIDMapper
      org.geotools.data.jdbc.fidmapper.NullFIDMapper

All Implemented Interfaces:

FIDMapper, java.io.Serializable

Direct Known Subclasses:

DB2NullFIDMapper

public class NullFIDMapper

extends AbstractFIDMapper

Last resort fid mapper for tables that does not have a primary key. It allows reading the table getting unique FIDs by using the same mechanism used by DefaultFeature, but the same Feature will receive a different FID each time it is loaded from the datastore.

Author:

wolf

See Also:

Serialized Form

Field Summary

Fields inherited from class org.geotools.data.jdbc.fidmapper.AbstractFIDMapper

returnFIDColumnsAsAttributes

Constructor Summary

NullFIDMapper()

Method Summary

java.lang.String	createID(java.sql.Connection conn, Feature feature, java.sql.Statement statement) Creates a new ID for a feature.
int	getColumnCount() Returns the number of columns in the primary keys handled by this mapper
int	getColumnDecimalDigits(int colIndex) Provides the number of decimal digits for this column.
java.lang.String	getColumnName(int colIndex) Returns the name of the specified column in the primary key
int	getColumnSize(int colIndex) Returns the size of a primary key column as it would be provided by the database metadata.
int	getColumnType(int colIndex) Returns the column type by using a constant available in the java.sql.Types interface
java.lang.String	getID(java.lang.Object[] attributes) Returns the FID given the values of the prymary key attributes
java.lang.Object[]	getPKAttributes(java.lang.String FID) Creates the value for the PK attributes given the feature.
void	initSupportStructures() This method will be called by JDBCDataStore when creating new tables to give the FID mapper an opportunity to initialize needed data structures, such as support tables, sequences, and so on.
boolean	isAutoIncrement(int colIndex) Returns true if the column is of serial type, that is, its value is automatically generated by the database if the user does not provide one
boolean	isVolatile() This FID mappers generates unique IDs out of the blue using UID
boolean	returnFIDColumnsAsAttributes() If true the primary key columns will be returned as attributes.

Methods inherited from class org.geotools.data.jdbc.fidmapper.AbstractFIDMapper

hasAutoIncrementColumns

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NullFIDMapper

public NullFIDMapper()

Method Detail

getID

public java.lang.String getID(java.lang.Object[] attributes)

Description copied from interface: FIDMapper

Returns the FID given the values of the prymary key attributes

Parameters:

attributes - DOCUMENT ME!

Returns:

See Also:

FIDMapper.getID(java.lang.Object[])

getPKAttributes

public java.lang.Object[] getPKAttributes(java.lang.String FID)
                                   throws java.io.IOException

Description copied from interface: FIDMapper

Creates the value for the PK attributes given the feature. If the FID is null, will throw an IOException if not possible. If null is returned, no primary key value needs to be specified, which is what we want for auto-increment fields.

Parameters:

FID - The feature ID is going to be parsed

Returns:

Throws:

java.io.IOException

See Also:

FIDMapper.getPKAttributes(java.lang.String)

createID

public java.lang.String createID(java.sql.Connection conn,
                                 Feature feature,
                                 java.sql.Statement statement)
                          throws java.io.IOException

Description copied from interface: FIDMapper

Creates a new ID for a feature.
This is done either by querying the database (for auto-increment like types, for example sequences) or by inspecting the Feature (for example, for primary keys with business meaning that whose attributes are included in the Feature ones).

Parameters:

conn - - the database connection

feature - - the feature that needs the new FID

statement - - the statement used to insert the feature into the database

Returns:

Throws:

java.io.IOException

See Also:

FIDMapper.createID(java.sql.Connection, org.geotools.feature.Feature, Statement)

returnFIDColumnsAsAttributes

public boolean returnFIDColumnsAsAttributes()

Description copied from interface: FIDMapper

If true the primary key columns will be returned as attributes. This is fundamental for primary key with businnes meaning.

Specified by:

returnFIDColumnsAsAttributes in interface FIDMapper

Overrides:

returnFIDColumnsAsAttributes in class AbstractFIDMapper

See Also:

FIDMapper.returnFIDColumnsAsAttributes()

getColumnCount

public int getColumnCount()

Description copied from interface: FIDMapper

Returns the number of columns in the primary keys handled by this mapper

Returns:

See Also:

FIDMapper.getColumnCount()

getColumnName

public java.lang.String getColumnName(int colIndex)

Description copied from interface: FIDMapper

Returns the name of the specified column in the primary key

Parameters:

colIndex -

Returns:

See Also:

FIDMapper.getColumnName(int)

getColumnType

public int getColumnType(int colIndex)

Description copied from interface: FIDMapper

Returns the column type by using a constant available in the java.sql.Types interface

Parameters:

colIndex -

Returns:

See Also:

FIDMapper.getColumnType(int)

getColumnSize

public int getColumnSize(int colIndex)

Description copied from interface: FIDMapper

Returns the size of a primary key column as it would be provided by the database metadata. Some fields requires a size specification, such as VARCHAR or NUMBER, whilst other don't have or don't need it (for example, an INTEGER or a TEXT field).

Parameters:

colIndex -

Returns:

See Also:

FIDMapper.getColumnSize(int)

getColumnDecimalDigits

public int getColumnDecimalDigits(int colIndex)

Description copied from interface: FIDMapper

Provides the number of decimal digits for this column. This is relevant in particular when the column is a scaled integer such as a NUMBER column

Parameters:

colIndex -

Returns:

See Also:

FIDMapper.getColumnDecimalDigits(int)

isAutoIncrement

public boolean isAutoIncrement(int colIndex)

Description copied from interface: FIDMapper

Returns true if the column is of serial type, that is, its value is automatically generated by the database if the user does not provide one

Parameters:

colIndex -

Returns:

See Also:

FIDMapper.isAutoIncrement(int)

initSupportStructures

public void initSupportStructures()

Description copied from interface: FIDMapper

This method will be called by JDBCDataStore when creating new tables to give the FID mapper an opportunity to initialize needed data structures, such as support tables, sequences, and so on.

See Also:

FIDMapper.initSupportStructures()

isVolatile

public boolean isVolatile()

This FID mappers generates unique IDs out of the blue using UID

Specified by:

isVolatile in interface FIDMapper

Overrides:

isVolatile in class AbstractFIDMapper

See Also:

FIDMapper.isVolatile()