org.nuiton.j2r.net
Class RNetEngine

java.lang.Object
  org.nuiton.j2r.REngineAbstract
      org.nuiton.j2r.net.RNetEngine

All Implemented Interfaces:

REngine

public class RNetEngine
extends REngineAbstract
implements REngine

This class represents the network engine to access R. By default, it tries to connect on address 127.0.0.1 and port 6311. Meanwhile, it is possible to parametrize it. You only need to replace the launch option -DR.type=net by -DR.type=net://192.168.99.122:6312 where 192.168.99.122 is the distant machine adress and 6312 the port on which the server is running.

Field Summary

static String	DEFAULT_HOST
static int	DEFAULT_PORT

Constructor Summary

RNetEngine()

Method Summary

void	commit() Method to commit all the R expressions stored while in non-autocommit mode
protected RDataFrame	convertToRDataFrame(org.rosuda.REngine.REXP rexp)
protected RList	convertToRList(org.rosuda.REngine.REXP rexp)
Object	eval(String expr) Method to send a R instruction to the engine and get back the result.
Object	evalScript(String expr) Evaluate a R multi-line expression in R and get back the result.
boolean	init() Initialize the engine.
boolean	init(String host, int port) Method to initialize the connection with specified host and port.
void	terminate() Terminate the connection with the server.
void	voidEval(String expr) Method to send a R instruction to the engine without getting back the result.

Methods inherited from class org.nuiton.j2r.REngineAbstract

clearSession, cp, dget, dget, dput, dput, getwd, isAutoCommit, loadRData, loadRData, loadRData, ls, mv, plot, remove, saveRData, saveRData, saveRData, setAutoCommit, setwd

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.nuiton.j2r.REngine

clearSession, cp, dget, dget, dput, dput, getwd, isAutoCommit, loadRData, loadRData, loadRData, ls, mv, plot, remove, saveRData, saveRData, saveRData, setAutoCommit, setwd

Field Detail

DEFAULT_PORT

public static final int DEFAULT_PORT

See Also:

Constant Field Values

DEFAULT_HOST

public static final String DEFAULT_HOST

See Also:

Constant Field Values

Constructor Detail

RNetEngine

public RNetEngine()

Method Detail

init

public boolean init()

Initialize the engine.

Specified by:

init in interface REngine

Returns:

true/false to indicate if the initialization was succesful.

See Also:

REngine.init()

init

public boolean init(String host,
                    int port)

Method to initialize the connection with specified host and port.

Parameters:

host - Adress of the Rserve instance

port - Port on which the Rserve instance is listening.

Returns:

true if initialized false otherwise.

eval

public Object eval(String expr)
            throws RException

Method to send a R instruction to the engine and get back the result.

Specified by:

eval in interface REngine

Parameters:

expr - the R expression to evaluate.

Returns:

the result of the R expression.

Throws:

RException - if an error occur while evaluating the R expression.

See Also:

REngine.eval(java.lang.String)

evalScript

public Object evalScript(String expr)
                  throws RException

Evaluate a R multi-line expression in R and get back the result.

Specified by:

evalScript in interface REngine

Parameters:

expr - the R expression to evaluate.

Returns:

the result of the R expression.

Throws:

RException - if an error occur while trying to evaluate the expression.

See Also:

REngine.eval(java.lang.String)

convertToRDataFrame

protected RDataFrame convertToRDataFrame(org.rosuda.REngine.REXP rexp)
                                  throws org.rosuda.REngine.REXPMismatchException

Throws:

org.rosuda.REngine.REXPMismatchException

convertToRList

protected RList convertToRList(org.rosuda.REngine.REXP rexp)
                        throws org.rosuda.REngine.REXPMismatchException

Throws:

org.rosuda.REngine.REXPMismatchException

terminate

public void terminate()
               throws RException

Terminate the connection with the server.

Specified by:

terminate in interface REngine

Throws:

RException

See Also:

REngine.terminate()

voidEval

public void voidEval(String expr)
              throws RException

Method to send a R instruction to the engine without getting back the result. If not into autocommit mode, instructions are stored and sent to R after a call of the commit method.

Specified by:

voidEval in interface REngine

Parameters:

expr - The R expression to evaluate.

Throws:

RException

See Also:

REngine.voidEval(java.lang.String), commit()

commit

public void commit()
            throws RException

Method to commit all the R expressions stored while in non-autocommit mode

Specified by:

commit in interface REngine

Throws:

RException - if an error occur while evaluating one expression.