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There is a newer version: 8.14.0
/*
 * 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 org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexSettings;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * A custom normalizer that is built out of a char and token filters. On the
 * contrary to analyzers, it does not support tokenizers and only supports a
 * subset of char and token filters.
 */
public final class CustomNormalizerProvider extends AbstractIndexAnalyzerProvider {

    private final Settings analyzerSettings;

    private CustomAnalyzer customAnalyzer;

    public CustomNormalizerProvider(IndexSettings indexSettings, String name, Settings settings) {
        super(indexSettings, name, settings);
        this.analyzerSettings = settings;
    }

    public void build(
        final TokenizerFactory tokenizerFactory,
        final Map charFilters,
        final Map tokenFilters
    ) {
        if (analyzerSettings.get("tokenizer") != null) {
            throw new IllegalArgumentException("Custom normalizer [" + name() + "] cannot configure a tokenizer");
        }

        List charFilterNames = analyzerSettings.getAsList("char_filter");
        List charFiltersList = new ArrayList<>(charFilterNames.size());
        for (String charFilterName : charFilterNames) {
            CharFilterFactory charFilter = charFilters.get(charFilterName);
            if (charFilter == null) {
                throw new IllegalArgumentException(
                    "Custom normalizer [" + name() + "] failed to find char_filter under name [" + charFilterName + "]"
                );
            }
            if (charFilter instanceof NormalizingCharFilterFactory == false) {
                throw new IllegalArgumentException("Custom normalizer [" + name() + "] may not use char filter [" + charFilterName + "]");
            }
            charFiltersList.add(charFilter);
        }

        List tokenFilterNames = analyzerSettings.getAsList("filter");
        List tokenFilterList = new ArrayList<>(tokenFilterNames.size());
        for (String tokenFilterName : tokenFilterNames) {
            TokenFilterFactory tokenFilter = tokenFilters.get(tokenFilterName);
            if (tokenFilter == null) {
                throw new IllegalArgumentException(
                    "Custom Analyzer [" + name() + "] failed to find filter under name [" + tokenFilterName + "]"
                );
            }
            if (tokenFilter instanceof NormalizingTokenFilterFactory == false) {
                throw new IllegalArgumentException("Custom normalizer [" + name() + "] may not use filter [" + tokenFilterName + "]");
            }
            tokenFilterList.add(tokenFilter);
        }

        this.customAnalyzer = new CustomAnalyzer(
            tokenizerFactory,
            charFiltersList.toArray(new CharFilterFactory[charFiltersList.size()]),
            tokenFilterList.toArray(new TokenFilterFactory[tokenFilterList.size()])
        );
    }

    @Override
    public CustomAnalyzer get() {
        return this.customAnalyzer;
    }
}