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

Class NumberVectorLabelParser<V extends NumberVector<?,?>>

java.lang.Object

de.lmu.ifi.dbs.elki.datasource.parser.AbstractParser

de.lmu.ifi.dbs.elki.datasource.parser.NumberVectorLabelParser<V>

Type Parameters:

V - the type of NumberVector used

All Implemented Interfaces:

LinebasedParser, Parser, InspectionUtilFrequentlyScanned, Parameterizable

Direct Known Subclasses:

DoubleVectorLabelParser, FloatVectorLabelParser, SparseFloatVectorLabelParser, TermFrequencyParser

public abstract class NumberVectorLabelParser<V extends NumberVector<?,?>>
extends AbstractParser
implements LinebasedParser, Parser

Provides a parser for parsing one point per line, attributes separated by whitespace.

Several labels may be given per point. A label must not be parseable as double. Lines starting with "#" will be ignored.

An index can be specified to identify an entry to be treated as class label. This index counts all entries (numeric and labels as well) starting with 0.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	NumberVectorLabelParser.Parameterizer<V extends NumberVector<?,?>> Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
static OptionID	LABEL_INDICES_ID A comma separated list of the indices of labels (may be numeric), counting whitespace separated entries in a line starting with 0.
protected BitSet	labelIndices Keeps the indices of the attributes to be treated as a string label.

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

Constructors

Constructor and Description
NumberVectorLabelParser(Pattern colSep, char quoteChar, BitSet labelIndices) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract V	createDBObject(List<Double> attributes) Creates a database object of type V.
protected abstract VectorFieldTypeInformation<V>	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.
SingleObjectBundle	parseLine(String line) Parse a single line into a database object
protected Pair<V,LabelList>	parseLineInternal(String line) Internal method for parsing a single line.

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

getLogger, tokenize, toString

Methods inherited from class java.lang.Object

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

Field Detail

LABEL_INDICES_ID

public static final OptionID LABEL_INDICES_ID

A comma separated list of the indices of labels (may be numeric), counting whitespace separated entries in a line starting with 0. The corresponding entries will be treated as a label.

Key: -parser.labelIndices

labelIndices

protected BitSet labelIndices

Keeps the indices of the attributes to be treated as a string label.

Constructor Detail

NumberVectorLabelParser

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

Constructor

Parameters:

colSep -

quoteChar -

labelIndices -

Method Detail

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

Parameters:

in - the stream to parse objects from

Returns:

a list containing those objects parsed from the input stream

parseLine

public SingleObjectBundle parseLine(String line)

Description copied from interface: LinebasedParser

Parse a single line into a database object

Specified by:

parseLine in interface LinebasedParser

Parameters:

line - single line

Returns:

parsing result

parseLineInternal

protected Pair<V,LabelList> parseLineInternal(String line)

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.

Parameters:

line - Line to process

Returns:

parsing result

createDBObject

protected abstract V createDBObject(List<Double> attributes)

Creates a database object of type V.

Parameters:

attributes - the attributes of the vector to create.

Returns:

a RalVector of type V containing the given attribute values

getTypeInformation

protected abstract VectorFieldTypeInformation<V> getTypeInformation(int dimensionality)

Get a prototype object for the given dimensionality.

Parameters:

dimensionality - Dimensionality

Returns:

Prototype object