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

Introduction

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

Prototype

public static Automaton makeChar(int c) 

Source Link

Document

Returns a new (deterministic) automaton that accepts a single codepoint of the given value.

Usage

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.*`. *//*from  w w w .j a  v a  2  s  .co m*/
private static Automaton makeMatchDotsInFieldNames(Automaton automaton) {
    return Operations.union(automaton,
            Operations.concatenate(Arrays.asList(automaton, Automata.makeChar('.'), Automata.makeAnyString())));
}

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From source file:org.elasticsearch.xpack.core.security.authz.permission.FieldPermissions.java

License:Open Source License

private static Automaton initializePermittedFieldsAutomaton(final String[] grantedFields,
        final String[] deniedFields) {
    Automaton grantedFieldsAutomaton;//from  ww  w.j  a v a  2s .c om
    if (grantedFields == null || Arrays.stream(grantedFields).anyMatch(Regex::isMatchAllPattern)) {
        grantedFieldsAutomaton = Automatons.MATCH_ALL;
    } else {
        // an automaton that includes metadata fields, including join fields created by the _parent field such
        // as _parent#type
        Automaton metaFieldsAutomaton = Operations.concatenate(Automata.makeChar('_'),
                Automata.makeAnyString());
        grantedFieldsAutomaton = Operations.union(Automatons.patterns(grantedFields), metaFieldsAutomaton);
    }

    Automaton deniedFieldsAutomaton;
    if (deniedFields == null || deniedFields.length == 0) {
        deniedFieldsAutomaton = Automatons.EMPTY;
    } else {
        deniedFieldsAutomaton = Automatons.patterns(deniedFields);
    }

    grantedFieldsAutomaton = MinimizationOperations.minimize(grantedFieldsAutomaton,
            Operations.DEFAULT_MAX_DETERMINIZED_STATES);
    deniedFieldsAutomaton = MinimizationOperations.minimize(deniedFieldsAutomaton,
            Operations.DEFAULT_MAX_DETERMINIZED_STATES);

    if (subsetOf(deniedFieldsAutomaton, grantedFieldsAutomaton) == false) {
        throw new ElasticsearchSecurityException("Exceptions for field permissions must be a subset of the "
                + "granted fields but " + Strings.arrayToCommaDelimitedString(deniedFields)
                + " is not a subset of " + Strings.arrayToCommaDelimitedString(grantedFields));
    }

    grantedFieldsAutomaton = Automatons.minusAndMinimize(grantedFieldsAutomaton, deniedFieldsAutomaton);
    return grantedFieldsAutomaton;
}

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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.
 *///from  ww 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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