Example usage for org.apache.lucene.util.automaton Operations concatenate

Introduction

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

Prototype

static public Automaton concatenate(List<Automaton> l) 

Source Link

Document

Returns an automaton that accepts the concatenation of the languages of the given automata.

Usage

From source file:org.codelibs.elasticsearch.common.regex.Regex.java

License:Apache License

/** Return an {Automaton} that matches the given pattern. */
public static Automaton simpleMatchToAutomaton(String pattern) {
    List<Automaton> automata = new ArrayList<>();
    int previous = 0;
    for (int i = pattern.indexOf('*'); i != -1; i = pattern.indexOf('*', i + 1)) {
        automata.add(Automata.makeString(pattern.substring(previous, i)));
        automata.add(Automata.makeAnyString());
        previous = i + 1;/*  w  w w  .ja va2 s .c  om*/
    }
    automata.add(Automata.makeString(pattern.substring(previous)));
    return Operations.concatenate(automata);
}

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From source file:org.codelibs.elasticsearch.common.xcontent.support.XContentMapValues.java

License:Apache License

/** Make matches on objects also match dots in field names.
 *  For instance, if the original simple regex is `foo`, this will translate
 *  it into `foo` OR `foo.*`. *//*w  ww. jav a 2 s  .c  o  m*/
private static Automaton makeMatchDotsInFieldNames(Automaton automaton) {
    return Operations.union(automaton,
            Operations.concatenate(Arrays.asList(automaton, Automata.makeChar('.'), Automata.makeAnyString())));
}

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