net.sf.classifier4J.bayesian
Class JDBCWordsDataSource

java.lang.Object
  |
  +--net.sf.classifier4J.bayesian.JDBCWordsDataSource

All Implemented Interfaces:

ICategorisedWordsDataSource, IWordsDataSource

public class JDBCWordsDataSource

extends java.lang.Object

implements ICategorisedWordsDataSource

A JDBC based datasource. It requires a table of the following structure (tested in MySQL 4):

 CREATE TABLE word_probability (
	word			VARCHAR(255) NOT NULL,
	category		VARCHAR(20) NOT NULL,
	match_count		INT DEFAULT 0 NOT NULL,
	nonmatch_count	INT DEFAULT 0 NOT NULL,
	PRIMARY KEY(word, category)
 )
 

It will truncate any word longer than 255 characters to 255 characters

Author:

Nick Lothian, Peter Leschev

Constructor Summary

JDBCWordsDataSource(IJDBCConnectionManager cm)
Create a JDBCWordsDataSource using the DEFAULT_CATEGORY ("DEFAULT")

Method Summary

void	addMatch(java.lang.String word) Add a matching word to the data source
void	addMatch(java.lang.String category, java.lang.String word) Add a matching word to the data source
void	addNonMatch(java.lang.String word) Add a non-matching word to the data source
void	addNonMatch(java.lang.String category, java.lang.String word) Add a non-matching word to the data source
WordProbability	getWordProbability(java.lang.String word)
WordProbability	getWordProbability(java.lang.String category, java.lang.String word)

Methods inherited from class java.lang.Object

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

Constructor Detail

JDBCWordsDataSource

public JDBCWordsDataSource(IJDBCConnectionManager cm)
                    throws WordsDataSourceException

Create a JDBCWordsDataSource using the DEFAULT_CATEGORY ("DEFAULT")

Parameters:

cm - The connection manager to use

Method Detail

getWordProbability

public WordProbability getWordProbability(java.lang.String category,
                                          java.lang.String word)
                                   throws WordsDataSourceException

Specified by:

getWordProbability in interface ICategorisedWordsDataSource

Parameters:

category - the category to check against

word - The word to calculate the probability of

Returns:

The word probability if the word exists, null otherwise;

Throws:

WordsDataSourceException - If there is a fatal problem. For example, the database is unavailable

getWordProbability

public WordProbability getWordProbability(java.lang.String word)
                                   throws WordsDataSourceException

Specified by:

getWordProbability in interface IWordsDataSource

Parameters:

word - The word to calculate the probability of

Returns:

The word probability if the word exists, null otherwise;

Throws:

WordsDataSourceException - If there is a fatal problem. For example, the database is unavailable

addMatch

public void addMatch(java.lang.String category,
                     java.lang.String word)
              throws WordsDataSourceException

Description copied from interface: ICategorisedWordsDataSource

Add a matching word to the data source

Specified by:

addMatch in interface ICategorisedWordsDataSource

Parameters:

category - the category add the match to

word - the word that matches

Throws:

WordsDataSourceException - If there is a fatal problem. For example, the database is unavailable

addMatch

public void addMatch(java.lang.String word)
              throws WordsDataSourceException

Description copied from interface: IWordsDataSource

Add a matching word to the data source

Specified by:

addMatch in interface IWordsDataSource

Parameters:

word - the word that matches

Throws:

WordsDataSourceException - If there is a fatal problem. For example, the database is unavailable

addNonMatch

public void addNonMatch(java.lang.String category,
                        java.lang.String word)
                 throws WordsDataSourceException

Description copied from interface: ICategorisedWordsDataSource

Add a non-matching word to the data source

Specified by:

addNonMatch in interface ICategorisedWordsDataSource

Parameters:

category - the category add the non-match to

word - the word that does not match

Throws:

WordsDataSourceException - If there is a fatal problem. For example, the database is unavailable

addNonMatch

public void addNonMatch(java.lang.String word)
                 throws WordsDataSourceException

Description copied from interface: IWordsDataSource

Add a non-matching word to the data source

Specified by:

addNonMatch in interface IWordsDataSource

Parameters:

word - the word that does not match

Throws:

WordsDataSourceException - If there is a fatal problem. For example, the database is unavailable