de.lmu.ifi.dbs.elki.datasource.parser
Class TermFrequencyParser

java.lang.Object
  de.lmu.ifi.dbs.elki.datasource.parser.AbstractParser
      de.lmu.ifi.dbs.elki.datasource.parser.NumberVectorLabelParser<SparseFloatVector>
          de.lmu.ifi.dbs.elki.datasource.parser.TermFrequencyParser

All Implemented Interfaces:

LinebasedParser, Parser, InspectionUtilFrequentlyScanned, Parameterizable

@Title(value="Term frequency parser")
@Description(value="Parse a file containing term frequencies. The expected format is \'label term1  term2  ...\'. Terms must not contain the separator character!")
public class TermFrequencyParser
extends NumberVectorLabelParser<SparseFloatVector>

A parser to load term frequency data, which essentially are sparse vectors with text keys.

Nested Class Summary

static class

TermFrequencyParser.Parameterizer Parameterization class.

Field Summary

(package private) HashMap<String,Integer>	keymap Map
private static Logging	logger Class logger
(package private) int	maxdim Maximum dimension used

Fields inherited from class de.lmu.ifi.dbs.elki.datasource.parser.NumberVectorLabelParser

LABEL_INDICES_ID, labelIndices

Fields inherited from class de.lmu.ifi.dbs.elki.datasource.parser.AbstractParser

ATTRIBUTE_CONCATENATION, COLUMN_SEPARATOR_ID, COMMENT, NUMBER_PATTERN, QUOTE_CHAR, QUOTE_ID, quoteChar, WHITESPACE_PATTERN

Constructor Summary

TermFrequencyParser(Pattern colSep, char quoteChar, BitSet labelIndices)
Constructor.

Method Summary

protected SparseFloatVector	createDBObject(List<Double> attributes) Creates a database object of type V.
protected Logging	getLogger() Get the logger for this class.
protected VectorFieldTypeInformation<SparseFloatVector>	getTypeInformation(int dimensionality) Get a prototype object for the given dimensionality.
MultipleObjectsBundle	parse(InputStream in) Returns a list of the objects parsed from the specified input stream.
Pair<SparseFloatVector,LabelList>	parseLineInternal(String line) Internal method for parsing a single line.

Methods inherited from class de.lmu.ifi.dbs.elki.datasource.parser.NumberVectorLabelParser

parseLine

Methods inherited from class de.lmu.ifi.dbs.elki.datasource.parser.AbstractParser

tokenize, toString

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final Logging logger

Class logger

maxdim

int maxdim

Maximum dimension used

keymap

HashMap<String,Integer> keymap

Map

Constructor Detail

TermFrequencyParser

public TermFrequencyParser(Pattern colSep,
                           char quoteChar,
                           BitSet labelIndices)

Constructor.

Parameters:

colSep -

quoteChar -

labelIndices -

Method Detail

createDBObject

protected SparseFloatVector createDBObject(List<Double> attributes)

Description copied from class: NumberVectorLabelParser

Creates a database object of type V.

Specified by:

createDBObject in class NumberVectorLabelParser<SparseFloatVector>

Parameters:

attributes - the attributes of the vector to create.

Returns:

a RalVector of type V containing the given attribute values

parseLineInternal

public Pair<SparseFloatVector,LabelList> parseLineInternal(String line)

Description copied from class: NumberVectorLabelParser

Internal method for parsing a single line. Used by both line based parsig as well as block parsing. This saves the building of meta data for each line.

Overrides:

parseLineInternal in class NumberVectorLabelParser<SparseFloatVector>

Parameters:

line - Line to process

Returns:

parsing result

parse

public MultipleObjectsBundle parse(InputStream in)

Description copied from interface: Parser

Returns a list of the objects parsed from the specified input stream.

Specified by:

parse in interface Parser

Overrides:

parse in class NumberVectorLabelParser<SparseFloatVector>

Parameters:

in - the stream to parse objects from

Returns:

a list containing those objects parsed from the input stream

getTypeInformation

protected VectorFieldTypeInformation<SparseFloatVector> getTypeInformation(int dimensionality)

Description copied from class: NumberVectorLabelParser

Get a prototype object for the given dimensionality.

Specified by:

getTypeInformation in class NumberVectorLabelParser<SparseFloatVector>

Parameters:

dimensionality - Dimensionality

Returns:

Prototype object

getLogger

protected Logging getLogger()

Description copied from class: AbstractParser

Get the logger for this class.

Specified by:

getLogger in class AbstractParser

Returns:

Logger.