|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
ObjectAbstractFIDMapper
NullFIDMapper
public class NullFIDMapper
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.
Field Summary |
---|
Fields inherited from class AbstractFIDMapper |
---|
autoIncrement, colDecimalDigits, colNames, colSizes, colTypes, returnFIDColumnsAsAttributes, tableName, tableSchemaName |
Constructor Summary | |
---|---|
NullFIDMapper()
|
|
NullFIDMapper(String tableSchemaName,
String tableName)
Constructor to set schema and table name for Null mapper. |
Method Summary | |
---|---|
String |
createID(Connection conn,
SimpleFeature feature,
Statement statement)
Creates a new ID for a feature. |
String |
getID(Object[] attributes)
Returns the FID given the values of the prymary key attributes |
Object[] |
getPKAttributes(String FID)
Creates the value for the PK attributes given the feature. |
boolean |
isValid(String fid)
Provides a simple means of assessing if a feature id is structurally valid with respect to the fids this FIDMapper creates. |
boolean |
isVolatile()
This FID mappers generates unique IDs out of the blue using UID |
Methods inherited from class Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
---|
public NullFIDMapper()
public NullFIDMapper(String tableSchemaName, String tableName)
tableSchemaName
- tableName
- Method Detail |
---|
public String getID(Object[] attributes)
FIDMapper
attributes
- DOCUMENT ME!FIDMapper.getID(java.lang.Object[])
public Object[] getPKAttributes(String FID) throws IOException
FIDMapper
FID
- The feature ID is going to be parsed
IOException
FIDMapper.getPKAttributes(java.lang.String)
public String createID(Connection conn, SimpleFeature feature, Statement statement) throws IOException
FIDMapper
conn
- - the database connectionfeature
- - the feature that needs the new FIDstatement
- - the statement used to insert the feature into the
database
IOException
org.geotools.data.jdbc.fidmapper.FIDMapper#createID(java.sql.Connection,
org.geotools.feature.Feature, Statement)
public boolean isVolatile()
UID
isVolatile
in interface FIDMapper
isVolatile
in class AbstractFIDMapper
FIDMapper.isVolatile()
public boolean isValid(String fid)
FIDMapper
The primary purpose of this method is to help in filtering out fids from filters that are not appropriate for a given FeatureType but that may otherwise being treated as valid if they get down to the actual SQL query.
The validity check may be as strict or as loose as the concrete FIDMapper wishes, since there may be cases where whether a fid in a filter is valid or not is not that important, or where it may result in deleting a Feature that was not expected to be deleted.
An example of such a need for validation may be a feature id composed like <featureTypeName>.<number>
, where the actual table PK is just the <number>
part. If
a request over the FeatureType "ft1" is made with a fid filter like ft2.1
, this
method can ensure the number 1
is not send out in the SQL query at all.
fid
- a feature id to check for structural validity
true
alwaysFIDMapper.isValid(String)
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |