Example usage for org.apache.lucene.util.automaton Automata makeAnyChar

Introduction

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

Prototype

public static Automaton makeAnyChar() 

Source Link

Document

Returns a new (deterministic) automaton that accepts any single codepoint.

Usage

From source file:org.elasticsearch.xpack.core.security.support.Automatons.java

License:Open Source License

/**
 * Builds and returns an automaton that represents the given pattern.
 *///w w  w.j a v  a 2 s  .c o m
@SuppressWarnings("fallthrough") // explicit fallthrough at end of switch
static Automaton wildcard(String text) {
    List<Automaton> automata = new ArrayList<>();
    for (int i = 0; i < text.length();) {
        final char c = text.charAt(i);
        int length = 1;
        switch (c) {
        case WILDCARD_STRING:
            automata.add(Automata.makeAnyString());
            break;
        case WILDCARD_CHAR:
            automata.add(Automata.makeAnyChar());
            break;
        case WILDCARD_ESCAPE:
            // add the next codepoint instead, if it exists
            if (i + length < text.length()) {
                final char nextChar = text.charAt(i + length);
                length += 1;
                automata.add(Automata.makeChar(nextChar));
                break;
            } // else fallthru, lenient parsing with a trailing \
        default:
            automata.add(Automata.makeChar(c));
        }
        i += length;
    }
    return concatenate(automata);
}

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