Example usage for org.apache.lucene.util.automaton Automaton createState

Introduction

In this page you can find the example usage for org.apache.lucene.util.automaton Automaton createState.

Prototype

public int createState() 

Source Link

Document

Create a new state.

Usage

From source file:com.lucene.MyPrefixQuery.java

License:Apache License

public static Automaton toAutomaton(BytesRef prefix) {
    final int numStatesAndTransitions = prefix.length + 1;
    final Automaton automaton = new Automaton(numStatesAndTransitions, numStatesAndTransitions);
    int lastState = automaton.createState();
    for (int i = 0; i < prefix.length; i++) {
        int state = automaton.createState();
        automaton.addTransition(lastState, state, prefix.bytes[prefix.offset + i] & 0xff);
        lastState = state;/*  w ww.ja  va 2  s  .co m*/
    }
    automaton.setAccept(lastState, true);
    automaton.addTransition(lastState, lastState, 0, 255);
    automaton.finishState();
    assert automaton.isDeterministic();
    return automaton;
}

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