de.uni_leipzig.asv.utils

Interface IOInterface

All Known Implementing Classes:

IOWrapper

public interface IOInterface

Author:

knorke

Field Summary

Fields

Modifier and Type	Field and Description
static String	inputEncoding file input encoding
static String	inputseparator file input separator
static String	outputEncoding file output encoding
static String	outputseparator file output separator

Method Summary

Methods

Modifier and Type	Method and Description
void	closeOutput() simply close the outputfile you must call this method before the program terminates
IOIterator	getLineIterator() returns the IOIterator to iterate over file data
IOIterator	select(String tablename) select all cols from table "tablename" and returns an iterator
IOIterator	select(String tablename, String[] cols) select the "cols" from table "tablename" and returns an iterator
IOIterator	sendInputQuery(String query) iterates over the resultset of a given query please read the IOIteratorInterface code
boolean	sendOutputQuery(String query) send a query to database
void	setupInput(String inputfile) setup the inputfile for reading uses the separator to determine the amount of columns (use a simple split(separator)
void	setupInput(String inputfile, int cols) setup (open) the inputfile for reading
void	setupInput(String database, String username, String password) same as setupOutput( String ), but with hostname="localhost" and port=3306
void	setupInput(String database, String username, String password, String hostname, int port) setup the database to write in open a connection to db
void	setupOutput(String outputfile) setup the outputfile to write in you must call the closeOutput() to flush and close the outputfile
void	setupOutput(String database, String username, String password) same as above, but with hostname="localhost" and port=3306
void	setupOutput(String database, String username, String password, String hostname, int port) same as for setupInput, but for writing
boolean	writeLine(String line) write a line to an open file see de.uni_leipzig.asv.utils.IOInterface#setupOutput(java.lang.String)

Field Detail

inputEncoding

static final String inputEncoding

file input encoding

See Also:

Constant Field Values

outputEncoding

static final String outputEncoding

file output encoding

See Also:

Constant Field Values

inputseparator

static final String inputseparator

file input separator

See Also:

Constant Field Values

outputseparator

static final String outputseparator

file output separator

See Also:

Constant Field Values

Method Detail

getLineIterator

IOIterator getLineIterator()
                           throws IOWrapperException

returns the IOIterator to iterate over file data

Returns:

IO-Iterator to iterate over rows of your resultset

Throws:

IOWrapperException

writeLine

boolean writeLine(String line)
                  throws IOWrapperException

write a line to an open file see de.uni_leipzig.asv.utils.IOInterface#setupOutput(java.lang.String)

Returns:

true if everything is ok

Throws:

IOWrapperException

closeOutput

void closeOutput()
                 throws IOWrapperException

simply close the outputfile you must call this method before the program terminates

Throws:

IOWrapperException

setupInput

void setupInput(String inputfile,
              int cols)
                throws IOWrapperException

setup (open) the inputfile for reading

Parameters:

inputfile - the name of the input file

cols - in file, separated by tabs - use 0 for auto-detection (dynamic col-count)

Throws:

IOWrapperException

setupInput

void setupInput(String inputfile)
                throws IOWrapperException

setup the inputfile for reading uses the separator to determine the amount of columns (use a simple split(separator)

Parameters:

inputfile - to open the file for read

Throws:

IOWrapperException

setupOutput

void setupOutput(String outputfile)
                 throws IOWrapperException

setup the outputfile to write in you must call the closeOutput() to flush and close the outputfile

Parameters:

outputfile - to open the file to write into

Throws:

IOWrapperException

setupInput

void setupInput(String database,
              String username,
              String password,
              String hostname,
              int port)
                throws IOWrapperException

setup the database to write in open a connection to db

Parameters:

database - name, "de" for example

username - to log in

password - to log in

hostname - the database runs on

port - = database port

Throws:

IOWrapperException

setupInput

void setupInput(String database,
              String username,
              String password)
                throws IOWrapperException

same as setupOutput( String ), but with hostname="localhost" and port=3306

Parameters:

database -

username -

password -

Throws:

IOWrapperException

setupOutput

void setupOutput(String database,
               String username,
               String password,
               String hostname,
               int port)
                 throws IOWrapperException

same as for setupInput, but for writing

Parameters:

database -

username -

password -

hostname -

port -

Throws:

IOWrapperException

setupOutput

void setupOutput(String database,
               String username,
               String password)
                 throws IOWrapperException

same as above, but with hostname="localhost" and port=3306

Parameters:

database -

username -

password -

Throws:

IOWrapperException

select

IOIterator select(String tablename,
                String[] cols)
                  throws IOWrapperException

select the "cols" from table "tablename" and returns an iterator

Parameters:

tablename -

cols -

Returns:

Throws:

IOWrapperException

select

IOIterator select(String tablename)
                  throws IOWrapperException

select all cols from table "tablename" and returns an iterator

Parameters:

tablename -

Returns:

Throws:

IOWrapperException

sendInputQuery

IOIterator sendInputQuery(String query)
                          throws IOWrapperException

iterates over the resultset of a given query please read the IOIteratorInterface code

Parameters:

query -

Returns:

Throws:

IOWrapperException

sendOutputQuery

boolean sendOutputQuery(String query)
                        throws IOWrapperException

send a query to database

Parameters:

query -

Returns:

Throws:

IOWrapperException