net.amygdalum.stringsearchalgorithms.search.chars

Class WuManber

java.lang.Object

net.amygdalum.stringsearchalgorithms.search.chars.WuManber

All Implemented Interfaces:

StringSearchAlgorithm

public class WuManber
extends Object
implements StringSearchAlgorithm

An implementation of the Wu-Manber Algorithm. This algorithm takes a multiple string patterns as input and generates a finder which can find any of these patterns in documents.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WuManber.Factory

Constructor Summary

Constructors

Constructor and Description
WuManber(Collection<String> patterns)

Method Summary

Modifier and Type	Method and Description
StringFinder	createFinder(CharProvider chars, StringFinderOption... options) creates a StringFinder instance from the pattern (given by the current instance) and the given document.
int	getPatternLength()
static int	hashHash(char[] block)
static int	shiftHash(char[] block)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

WuManber

public WuManber(Collection<String> patterns)

Method Detail

shiftHash

public static int shiftHash(char[] block)

hashHash

public static int hashHash(char[] block)

createFinder

public StringFinder createFinder(CharProvider chars,
                                 StringFinderOption... options)

Description copied from interface: StringSearchAlgorithm

creates a StringFinder instance from the pattern (given by the current instance) and the given document.

Specified by:

createFinder in interface StringSearchAlgorithm

Parameters:

chars - the given document wrapped into a CharProvider

options - the configuration options for the string finder

Returns:

a StringFinder that can iterate over the matches

getPatternLength

public int getPatternLength()

Specified by:

getPatternLength in interface StringSearchAlgorithm

Returns:

the length of the given pattern (min length in case of a multi string algorithm)

toString

public String toString()

Overrides:

toString in class Object