stream.io

Class SvmLightStream

java.lang.Object

stream.io.AbstractStream

stream.io.AbstractLineStream

stream.io.SvmLightStream

All Implemented Interfaces:

Source, Stream

public class SvmLightStream
extends AbstractLineStream

This class implements a simple reader to read data in the SVM light data format. The data is read from a URL and parsed into a Data instance.

Author:

Christian Bockermann <chris@jwall.org>

Field Summary

Fields

Modifier and Type	Field and Description
(package private) boolean	addSparseVector
(package private) long	lineNumber
(package private) static org.slf4j.Logger	log
(package private) String	sparseKey

Fields inherited from class stream.io.AbstractLineStream

attributes, encoding, reader

Fields inherited from class stream.io.AbstractStream

closed, count, id, in, limit, prefix, seqId, sequenceKey, url

Constructor Summary

Constructors

Constructor and Description
SvmLightStream(InputStream in)
SvmLightStream(SourceURL url)
SvmLightStream(SourceURL url, String sparseVectorKey)

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
static InputVector	createSparseVector(Data datum)
String	getSparseKey()
static Data	parseLine(Data item, String line)
static Data	parseLine(Data item, String line, String sparseKey) This method parses a single line into a data item.
Data	readNext()
Data	readSparseVector(Data item)
static InputVector	readSparseVector(String line)
void	setSparseKey(String sparseKey)

Methods inherited from class stream.io.AbstractLineStream

getEncoding, init, readLine, setEncoding

Methods inherited from class stream.io.AbstractStream

, getId, getInputStream, getLimit, getPrefix, getSequenceKey, getUrl, read, setId, setLimit, setPrefix, setSequenceKey, setUrl

Methods inherited from class java.lang.Object

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

Field Detail

log

static org.slf4j.Logger log

lineNumber

long lineNumber

addSparseVector

boolean addSparseVector

sparseKey

String sparseKey

Constructor Detail

SvmLightStream

public SvmLightStream(SourceURL url)
               throws Exception

Throws:

Exception

SvmLightStream

public SvmLightStream(SourceURL url,
              String sparseVectorKey)
               throws Exception

Throws:

Exception

SvmLightStream

public SvmLightStream(InputStream in)
               throws Exception

Throws:

Exception

Method Detail

getSparseKey

public String getSparseKey()

Returns:

the sparseKey

setSparseKey

public void setSparseKey(String sparseKey)

Parameters:

sparseKey - the sparseKey to set

readNext

public Data readNext()
              throws Exception

Specified by:

readNext in class AbstractStream

Throws:

Exception

See Also:

stream.io.AbstractStream#readNext(stream.Data)

readSparseVector

public Data readSparseVector(Data item)
                      throws Exception

Throws:

Exception

parseLine

public static Data parseLine(Data item,
             String line,
             String sparseKey)
                      throws Exception

This method parses a single line into a data item. The line is expected to match the format of the SVMlight data format.

Parameters:

item -

line -

Returns:

Throws:

Exception

parseLine

public static Data parseLine(Data item,
             String line)
                      throws Exception

Throws:

Exception

readSparseVector

public static InputVector readSparseVector(String line)
                                    throws Exception

Throws:

Exception

createSparseVector

public static InputVector createSparseVector(Data datum)

close

public void close()

Specified by:

close in interface Source

Overrides:

close in class AbstractLineStream

See Also:

Source.close()