org.apache.lucene.util.automaton

Class DaciukMihovAutomatonBuilder

java.lang.Object

org.apache.lucene.util.automaton.DaciukMihovAutomatonBuilder

public final class DaciukMihovAutomatonBuilder
extends Object

Builds a minimal, deterministic Automaton that accepts a set of strings. The algorithm requires sorted input data, but is very fast (nearly linear with the input size).

See Also:

build(Collection), Automata.makeStringUnion(Collection)

Method Summary

Modifier and Type	Method and Description
void	add(CharsRef current) Add another character sequence to this automaton.
static Automaton	build(Collection<BytesRef> input) Build a minimal, deterministic automaton from a sorted list of BytesRef representing strings in UTF-8.
org.apache.lucene.util.automaton.DaciukMihovAutomatonBuilder.State	complete() Finalize the automaton and return the root state.

Methods inherited from class java.lang.Object

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

Method Detail

add

public void add(CharsRef current)

Add another character sequence to this automaton. The sequence must be lexicographically larger or equal compared to any previous sequences added to this automaton (the input must be sorted).

complete

public org.apache.lucene.util.automaton.DaciukMihovAutomatonBuilder.State complete()

Finalize the automaton and return the root state. No more strings can be added to the builder after this call.

Returns:

Root automaton state.

build

public static Automaton build(Collection<BytesRef> input)

Build a minimal, deterministic automaton from a sorted list of BytesRef representing strings in UTF-8. These strings must be binary-sorted.