de.caff.generics.algorithm

Class FastLongSequenceSearch

java.lang.Object

de.caff.generics.algorithm.FastLongSequenceSearch

public class FastLongSequenceSearch
extends java.lang.Object

Fast search algorithm in sequences of random-accessible long values.

Currently only forward search is implemented, but basically both the search indexable and the searched indexable can be reversed before searching.

Although based on integers this may also be used for searches in byte or character sequences.

Since:

July 07, 2020

Author:

Rammi

Constructor Summary

Constructors

Constructor and Description
FastLongSequenceSearch(long... searchTerm) Constructor.
FastLongSequenceSearch(LongIndexable searchTerm) Constructor.

Method Summary

Modifier and Type	Method and Description
IntIndexable	findAllMatches(LongIndexable data, boolean allowOverlaps) Find all matches.
int	findFirst(LongIndexable data) Find the first appearance of the search term in the given data.
int	findNext(LongIndexable data, int pos) Find the next appearance of the search term after the given position in the given data.
int	findNext(LongIndexable data, int pos, int end) Find the next appearance of the search term after the given start position and before the given end position in the given data.
LongIndexable	getSearchTerm() Get the search term.

Methods inherited from class java.lang.Object

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

Constructor Detail

FastLongSequenceSearch

public FastLongSequenceSearch(@NotNull
                              LongIndexable searchTerm)

Constructor.

Parameters:

searchTerm - term to search for

FastLongSequenceSearch

public FastLongSequenceSearch(long... searchTerm)

Constructor.

Parameters:

searchTerm - long int sequence to search for

Method Detail

getSearchTerm

@NotNull
public LongIndexable getSearchTerm()

Get the search term.

Returns:

search term

findFirst

public int findFirst(@NotNull
                     LongIndexable data)

Find the first appearance of the search term in the given data.

Parameters:

data - data to search through

Returns:

index of first appearance of the search term in the given data, or -1 if there was nothing found

findNext

public int findNext(@NotNull
                    LongIndexable data,
                    int pos)

Find the next appearance of the search term after the given position in the given data.

Parameters:

data - data to search through

pos - position to start the search

Returns:

position of next appearance of the search term in the given data after the given position, or -1 if there was nothing found between the position and the end of data

findNext

public int findNext(@NotNull
                    LongIndexable data,
                    int pos,
                    int end)

Find the next appearance of the search term after the given start position and before the given end position in the given data.

Parameters:

data - data to search through

pos - position to start the search

end - position to end the search, the whole search term has to fit before this position to be found

Returns:

position of next appearance of the search term in the given data after the given start position and before the given end position, or -1 if there was nothing found between the position and the end of data

findAllMatches

@NotNull
public IntIndexable findAllMatches(@NotNull
                                            LongIndexable data,
                                            boolean allowOverlaps)

Find all matches.

Parameters:

data - data to search

allowOverlaps - allow overlapping sequences in the matches?

Returns:

start position of all matches