gr.demokritos.iit.summarization.analysis
Class EntropyChunker

java.lang.Object
  gr.demokritos.iit.summarization.analysis.EntropyChunker

All Implemented Interfaces:

IChunker, java.io.Serializable

public class EntropyChunker
extends java.lang.Object
implements java.io.Serializable, IChunker

This class can separate a token sequence into chunks, based on the entropy of the following symbol.

See Also:

Serialized Form

Constructor Summary

EntropyChunker()
Creates a new instance of EntropyChunker.

Method Summary

java.util.List	chunkString(java.lang.String sToChunk) Returns a list of string chunks, derived from a given string.
void	clearDelimiters() Clears list of delimiters determined.
protected int	determineImportantDelimiters(java.util.SortedMap smMap)
java.util.SortedMap	getDelimiters() Returns a sorted map of delimiters, based on their entropy of next character measure.
static void	main(java.lang.String[] sArgs) Utility method.
protected java.lang.Integer[]	splitPointsByDelimiterList(java.lang.String sStr, java.util.SortedMap lDelimiters)
protected static java.lang.String[]	splitStringByDelimiterPoints(java.lang.String sStr, java.lang.Integer[] iRes) Returns the substrings defined by a string and a set of split points.
void	train(java.util.Set<java.lang.String> sFileNames) Train the statistics of the chunker from a given file set.
void	train(java.lang.String sTrainingText) Train the statistics of the chunker from a given text.

Methods inherited from class java.lang.Object

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

Constructor Detail

EntropyChunker

public EntropyChunker()

Creates a new instance of EntropyChunker.

Method Detail

train

public void train(java.util.Set<java.lang.String> sFileNames)

Train the statistics of the chunker from a given file set.

Parameters:

sFiles - The set of CategorizedFileEntry objects to use for training.

train

public void train(java.lang.String sTrainingText)

Train the statistics of the chunker from a given text.

Parameters:

sTrainingText - The text that defines the statistics used by the chunker.

clearDelimiters

public void clearDelimiters()

Clears list of delimiters determined.

getDelimiters

public java.util.SortedMap getDelimiters()

Returns a sorted map of delimiters, based on their entropy of next character measure.

Returns:

The SortedMap of Delimiters, where each delimiter is matched to its entropy measure.

chunkString

public java.util.List chunkString(java.lang.String sToChunk)

Returns a list of string chunks, derived from a given string.

Specified by:

chunkString in interface IChunker

Parameters:

sToChunk - The string to chunk.

Returns:

A List of strings that are the chunks of the given string.

splitPointsByDelimiterList

protected java.lang.Integer[] splitPointsByDelimiterList(java.lang.String sStr,
                                                         java.util.SortedMap lDelimiters)

splitStringByDelimiterPoints

protected static java.lang.String[] splitStringByDelimiterPoints(java.lang.String sStr,
                                                                 java.lang.Integer[] iRes)

Returns the substrings defined by a string and a set of split points.

Parameters:

sStr - The string to split.

iRes - An array of integers, indicating the points at which the string is to be split.

Returns:

An array of sub-strings of the given string.

determineImportantDelimiters

protected int determineImportantDelimiters(java.util.SortedMap smMap)

main

public static void main(java.lang.String[] sArgs)

Utility method. Used for testing purposes.