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eXist-db NoSQL Database n-gram Index

There is a newer version: 6.2.0

/*
 * eXist-db Open Source Native XML Database
 * Copyright (C) 2001 The eXist-db Authors
 *
 * [email protected]
 * http://www.exist-db.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.exist.xquery.modules.ngram.query;

public class Wildcard implements WildcardedExpression, MergeableExpression {
    final int minimumLength;
    final int maximumLength;

    public int getMinimumLength() {
        return minimumLength;
    }

    public int getMaximumLength() {
        return maximumLength;
    }

    public Wildcard(final int minimumLength, final int maximumLength) {
        this.minimumLength = minimumLength;
        this.maximumLength = maximumLength;
    }

    @Override
    public String toString() {
        return "Wildcard(" + minimumLength + ", " + maximumLength + ")";
    }

    @Override
    public WildcardedExpression mergeWith(final WildcardedExpression otherExpression) {
        Wildcard other = (Wildcard) otherExpression;
        int newMaximumLength = (this.maximumLength == Integer.MAX_VALUE || other.maximumLength == Integer.MAX_VALUE) ? Integer.MAX_VALUE
            : this.maximumLength + other.maximumLength;
        return new Wildcard(this.minimumLength + other.minimumLength, newMaximumLength);
    }

    @Override
    public boolean mergeableWith(final WildcardedExpression otherExpression) {
        return (otherExpression instanceof Wildcard);
    }
}