edu.illinois.cs.cogcomp.pos

Class FeatureVectorParser

java.lang.Object

edu.illinois.cs.cogcomp.pos.FeatureVectorParser

All Implemented Interfaces:

edu.illinois.cs.cogcomp.lbjava.parse.Parser

public class FeatureVectorParser
extends Object
implements edu.illinois.cs.cogcomp.lbjava.parse.Parser

This parser returns FeatureVectors deserialized out of the first file passed to the constructor. In fact, this first file contains only ints that index the features. The second file passed to the constructor is the lexicon used to translate from ints to Feature objects.

When run as a stand-alone program, this class takes the names of the example and lexicon files as input on the command line and simply writes a string representation of every example to STDOUT.

Author:

Nick Rizzolo

Field Summary

Fields

Modifier and Type	Field and Description
protected String	exampleFileName The name of the file to parse.
protected DataInputStream	in Reader for file currently being parsed.
protected edu.illinois.cs.cogcomp.lbjava.classify.Feature[]	lexicon The feature objects corresponding to the ints in the example file.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FeatureVectorParser(String exampleFile) For internal use only.
	FeatureVectorParser(String exampleFile, edu.illinois.cs.cogcomp.lbjava.classify.Feature[] lexicon) Creates the parser.
	FeatureVectorParser(String exampleFile, String lexiconFile) Creates the parser.

Method Summary

Modifier and Type	Method and Description
void	close() Frees any resources this parser may be holding.
static void	main(String[] args) Takes the names of the example and lexicon files as input on the command line and prints all the examples to STDOUT.
Object	next() Returns a FeatureVector deserialized out of the given file.
void	reset() Resets the example file stream to the beginning.

Methods inherited from class java.lang.Object

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

Field Detail

in

protected DataInputStream in

Reader for file currently being parsed.

exampleFileName

protected String exampleFileName

The name of the file to parse.

lexicon

protected edu.illinois.cs.cogcomp.lbjava.classify.Feature[] lexicon

The feature objects corresponding to the ints in the example file.

Constructor Detail

FeatureVectorParser

protected FeatureVectorParser(String exampleFile)

For internal use only. This constructor sets up the stream to read in the examples, but does not initialize the lexicon.

Parameters:

exampleFile - The name of the file to parse.

FeatureVectorParser

public FeatureVectorParser(String exampleFile,
                           edu.illinois.cs.cogcomp.lbjava.classify.Feature[] lexicon)

Creates the parser.

Parameters:

exampleFile - The name of the file to parse.

lexicon - The lexicon.

FeatureVectorParser

public FeatureVectorParser(String exampleFile,
                           String lexiconFile)

Creates the parser.

Parameters:

exampleFile - The name of the file to parse.

lexiconFile - The name of the lexicon file.

Method Detail

next

public Object next()

Returns a FeatureVector deserialized out of the given file.

Specified by:

next in interface edu.illinois.cs.cogcomp.lbjava.parse.Parser

reset

public void reset()

Resets the example file stream to the beginning. Alternatively, one could simply create a new FeatureVectorParser with the same constructor arguments, but this method avoids re-reading the lexicon.

Specified by:

reset in interface edu.illinois.cs.cogcomp.lbjava.parse.Parser

main

public static void main(String[] args)

Takes the names of the example and lexicon files as input on the command line and prints all the examples to STDOUT.

close

public void close()

Frees any resources this parser may be holding.

Specified by:

close in interface edu.illinois.cs.cogcomp.lbjava.parse.Parser