Package org.odpi.openmetadata.adapters.connectors.postgres.tabulardatasource

Class PostgresTabularDataSourceConnector

java.lang.Object

org.odpi.openmetadata.frameworks.connectors.Connector

org.odpi.openmetadata.frameworks.connectors.ConnectorBase

org.odpi.openmetadata.adapters.connectors.postgres.tabulardatasource.PostgresTabularDataSourceConnector

All Implemented Interfaces:

ReadableTabularDataSource, SecureConnectorExtension, VirtualConnectorExtension, WritableTabularDataSource

public class PostgresTabularDataSourceConnector
extends ConnectorBase
implements ReadableTabularDataSource, WritableTabularDataSource

PostgresTabularDataSourceConnector works with structured files to retrieve simple tables of data.

Nested Class Summary

Nested classes/interfaces inherited from class org.odpi.openmetadata.frameworks.connectors.ConnectorBase

ConnectorBase.ProtectedConnection

Field Summary

Fields inherited from class org.odpi.openmetadata.frameworks.connectors.ConnectorBase

auditLog, connectionBean, connectorInstanceId, embeddedConnectors, messageFormatter, secretsStoreConnectorMap

Constructor Summary

Constructors

Constructor	Description
PostgresTabularDataSourceConnector()

Method Summary

Modifier and Type	Method	Description
void	appendRecord(List<String> dataValues)	Write the requested data record to the end of the data source.
void	deleteRecord(long rowNumber)	Remove the requested data record.
void	disconnect()	Close the file
List<TabularColumnDescription>	getColumnDescriptions()	Return the list of column names associated with this data source.
int	getColumnNumber(String columnName)	Locate the named column.
long	getRecordCount()	Return the number of records in the file.
List<String>	readRecord(long dataRecordNumber)	Return the requested data record.
void	setColumnDescriptions(List<TabularColumnDescription> columnDescriptions)	Set up the columns associated with this tabular data source.
void	start()	Indicates that the connector is completely configured and can begin processing.
void	writeRecord(long requestedRowNumber, List<String> dataValues)	Write the requested data record.

Methods inherited from class org.odpi.openmetadata.frameworks.connectors.ConnectorBase

combineConfigurationProperties, disconnectConnectors, equals, getArrayConfigurationProperty, getArrayConfigurationProperty, getArrayConfigurationProperty, getBooleanConfigurationProperty, getConnection, getConnectorInstanceId, getDateConfigurationProperty, getIntConfigurationProperty, getLongConfigurationProperty, getStringConfigurationProperty, getStringConfigurationProperty, getSuppliedPlaceholderProperties, hashCode, initialize, initializeEmbeddedConnectors, initializeSecretsStoreConnector, isActive, logExceptionRecord, logRecord, logRecord, throwMissingConfigurationProperty, throwMissingEndpointAddress, throwMissingResource, throwNoAsset, throwWrongTypeOfAsset, throwWrongTypeOfResource, throwWrongTypeOfRootSchema, toString

Methods inherited from class org.odpi.openmetadata.frameworks.connectors.Connector

clearStatisticProperty, clearStatisticTimestamp, getConnectorStatistics, getStatisticCounter, getStatisticProperty, getStatisticTimestamp, incrementStatisticCounter, initializeStatisticCounter, refreshStatistics, setStatisticProperty, setStatisticTimestamp

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

PostgresTabularDataSourceConnector

public PostgresTabularDataSourceConnector()

Method Details

start

public void start()
           throws UserNotAuthorizedException,
ConnectorCheckedException

Indicates that the connector is completely configured and can begin processing.

Overrides:

start in class ConnectorBase

Throws:

ConnectorCheckedException - there is a problem within the connector.

UserNotAuthorizedException - the connector was disconnected before/during start

getRecordCount

public long getRecordCount()
                    throws ConnectorCheckedException

Return the number of records in the file. This is achieved by scanning the file and counting the records - not recommended for very large files.

Specified by:

getRecordCount in interface ReadableTabularDataSource

Specified by:

getRecordCount in interface WritableTabularDataSource

Returns:

count

Throws:

ConnectorCheckedException - problem accessing the data

getColumnDescriptions

public List<TabularColumnDescription> getColumnDescriptions()
                                                     throws ConnectorCheckedException

Return the list of column names associated with this data source.

Specified by:

getColumnDescriptions in interface ReadableTabularDataSource

Specified by:

getColumnDescriptions in interface WritableTabularDataSource

Returns:

a list of column descriptions or null if not available.

Throws:

ConnectorCheckedException - there is a problem accessing the data

getColumnNumber

public int getColumnNumber(String columnName)
                    throws ConnectorCheckedException

Locate the named column. A negative number means the column is not present.

Specified by:

getColumnNumber in interface ReadableTabularDataSource

Parameters:

columnName - name of the column to return

Returns:

column

Throws:

ConnectorCheckedException - problem extracting the column descriptions

readRecord

public List<String> readRecord(long dataRecordNumber)
                        throws ConnectorCheckedException

Return the requested data record. The first record is record 0. If the first line of the file is the column names then record 0 is the line following the column names.

Specified by:

readRecord in interface ReadableTabularDataSource

Parameters:

dataRecordNumber - long

Returns:

List of strings, each string is the value from the column.

Throws:

ConnectorCheckedException - there is a problem accessing the data

setColumnDescriptions

public void setColumnDescriptions(List<TabularColumnDescription> columnDescriptions)
                           throws ConnectorCheckedException

Set up the columns associated with this tabular data source. These are stored in the first record of the file. The rest of the file is cleared.

Specified by:

setColumnDescriptions in interface WritableTabularDataSource

Parameters:

columnDescriptions - a list of column descriptions

Throws:

ConnectorCheckedException - there is a problem accessing the data

writeRecord

public void writeRecord(long requestedRowNumber,
 List<String> dataValues)
                 throws ConnectorCheckedException

Write the requested data record. The first data record is record 0. This process reads the entire file, inserts the record in the right place and writes it out again.

Specified by:

writeRecord in interface WritableTabularDataSource

Parameters:

requestedRowNumber - long

dataValues - Map of column descriptions to strings, each string is the value for the column.

Throws:

ConnectorCheckedException - there is a problem accessing the data.

appendRecord

public void appendRecord(List<String> dataValues)
                  throws ConnectorCheckedException

Write the requested data record to the end of the data source.

Specified by:

appendRecord in interface WritableTabularDataSource

Parameters:

dataValues - Map of column descriptions to strings, each string is the value for the column.

Throws:

ConnectorCheckedException - there is a problem accessing the data.

deleteRecord

public void deleteRecord(long rowNumber)
                  throws ConnectorCheckedException

Remove the requested data record. The first data record is record 0.

Specified by:

deleteRecord in interface WritableTabularDataSource

Parameters:

rowNumber - long

Throws:

ConnectorCheckedException - there is a problem accessing the data.

disconnect

public void disconnect()

Close the file

Overrides:

disconnect in class ConnectorBase