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Apache Lucene (module: kuromoji)
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.analysis.ja.util;

import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Locale;

/**
 * Tool to build dictionaries. Usage:
 *
 *  *    java -cp [lucene classpath] org.apache.lucene.analysis.ja.util.DictionaryBuilder \
 *          ${inputDir} ${outputDir} ${encoding} ${normalizeEntry}
 * 
 *
 * The input directory is expected to include unk.def, matrix.def, plus any number of .csv files,
 * roughly following the conventions of IPADIC. JapaneseTokenizer uses dictionaries built with this
 * tool. Note that the input files required by this build generally must be generated from a corpus
 * of real text using tools that are not part of Lucene.
 *
 * The normalizeEntry option is a Boolean value.

 * If true, check a surface form (first column in csv) is NFC Normalized. If it isn't, NFC
 * normalized contents will be added to the TokenInfoDictionary in addition to the original form.
 * 

 * This option is false for pre-built dictionary in the Lucene.
 *
 * @lucene.experimental
 */
public class DictionaryBuilder {

  /** Format of the dictionary. */
  public enum DictionaryFormat {
    /** IPADIC format */
    IPADIC,
    /** UNIDIC format */
    UNIDIC
  }

  private DictionaryBuilder() {}

  public static void build(
      DictionaryFormat format,
      Path inputDir,
      Path outputDir,
      String encoding,
      boolean normalizeEntry)
      throws IOException {
    new TokenInfoDictionaryBuilder(format, encoding, normalizeEntry)
        .build(inputDir)
        .write(outputDir);

    new UnknownDictionaryBuilder(encoding).build(inputDir).write(outputDir);

    ConnectionCostsBuilder.build(inputDir.resolve("matrix.def")).write(outputDir);
  }

  public static void main(String[] args) throws IOException {
    DictionaryFormat format = DictionaryFormat.valueOf(args[0].toUpperCase(Locale.ROOT));
    String inputDirName = args[1];
    String outputDirName = args[2];
    String inputEncoding = args[3];
    boolean normalizeEntries = Boolean.parseBoolean(args[4]);
    DictionaryBuilder.build(
        format, Paths.get(inputDirName), Paths.get(outputDirName), inputEncoding, normalizeEntries);
  }
}