org.odpi.openmetadata.adapters.connectors.datastore.csvfile

Interface CSVFileStore

All Superinterfaces:

BasicFileStore

All Known Implementing Classes:

CSVFileStoreConnector

public interface CSVFileStore
extends BasicFileStore

CSVFileStore defines the specific connector api for working with CSV files. A CSV file is one where each row represents a record that is divided into attributes that are separated by a special character (usually a space). Each row has the same list of attributes and so the file is effectively a table of data.

Method Summary

Modifier and Type	Method and Description
List<String>	getColumnNames() Return the list of column names associated with this structured file.
String	getFileName() Return the name of the file to read.
Date	getLastUpdateDate() Return the last update data for the file.
long	getRecordCount() Return the number of records in the file.
List<String>	readRecord(int rowNumber) Return the requested data record.

Methods inherited from interface org.odpi.openmetadata.adapters.connectors.datastore.basicfile.BasicFileStore

getFile

Method Detail

getFileName

String getFileName()
            throws FileException,
                   FileReadException

Return the name of the file to read.

Returns:

file name

Throws:

FileException - there is a problem accessing the file

FileReadException - - the file name is null, the file does not exist, or is a directory or is not readable.

getLastUpdateDate

Date getLastUpdateDate()
                throws FileException,
                       FileReadException

Return the last update data for the file.

Returns:

Date object

Throws:

FileException - there is a problem accessing the file

FileReadException - - the file name is null, the file does not exist, or is a directory or is not readable.

getRecordCount

long getRecordCount()
             throws FileException,
                    FileReadException

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.

Returns:

count

Throws:

FileException - there is a problem accessing the file

FileReadException - unable to find, open or scan the file.

getColumnNames

List<String> getColumnNames()
                     throws FileException,
                            FileReadException

Return the list of column names associated with this structured file. This may be embedded in the first line of the file or encoded in the connection object used to create a connector instance.

Returns:

a list of column names

Throws:

FileException - there is a problem accessing the file

FileReadException - unable to retrieve the column names

readRecord

List<String> readRecord(int rowNumber)
                 throws FileException,
                        FileReadException

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.

Parameters:

rowNumber - long

Returns:

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

Throws:

FileException - there is a problem accessing the file

FileReadException - unable to find, open or read the file, or the file does not include the requested record.