/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.index.analysis;

import com.ibm.icu.text.Transliterator;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.icu.ICUTransformFilter;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;

public class IcuTransformTokenFilterFactory extends AbstractTokenFilterFactory implements NormalizingTokenFilterFactory {

    private final String id;
    private final int dir;
    private final Transliterator transliterator;

    public IcuTransformTokenFilterFactory(IndexSettings indexSettings, Environment environment, String name, Settings settings) {
        super(indexSettings, name, settings);
        this.id = settings.get("id", "Null");
        String s = settings.get("dir", "forward");
        this.dir = "forward".equals(s) ? Transliterator.FORWARD : Transliterator.REVERSE;
        this.transliterator = Transliterator.getInstance(id, dir);
    }

    @Override
    public TokenStream create(TokenStream tokenStream) {
        return new ICUTransformFilter(tokenStream, transliterator);
    }

}
