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Lucene Kuromoji Japanese Morphological Analyzer
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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;


import org.apache.lucene.analysis.ja.JapaneseTokenizer.Type;
import org.apache.lucene.analysis.ja.dict.Dictionary;

/**
 * Analyzed token with morphological data from its dictionary.
 */
public class Token {
  private final Dictionary dictionary;

  private final int wordId;

  private final char[] surfaceForm;
  private final int offset;
  private final int length;

  private final int position;
  private int positionLength;

  private final Type type;

  public Token(int wordId, char[] surfaceForm, int offset, int length, Type type, int position, Dictionary dictionary) {
    this.wordId = wordId;
    this.surfaceForm = surfaceForm;
    this.offset = offset;
    this.length = length;
    this.type = type;
    this.position = position;
    this.dictionary = dictionary;
  }

  @Override
  public String toString() {
    return "Token(\"" + new String(surfaceForm, offset, length) + "\" pos=" + position + " length=" + length +
      " posLen=" + positionLength + " type=" + type + " wordId=" + wordId +
      " leftID=" + dictionary.getLeftId(wordId) + ")";
  }

  /**
   * @return surfaceForm
   */
  public char[] getSurfaceForm() {
    return surfaceForm;
  }

  /**
   * @return offset into surfaceForm
   */
  public int getOffset() {
    return offset;
  }

  /**
   * @return length of surfaceForm
   */
  public int getLength() {
    return length;
  }

  /**
   * @return surfaceForm as a String
   */
  public String getSurfaceFormString() {
    return new String(surfaceForm, offset, length);
  }

  /**
   * @return reading. null if token doesn't have reading.
   */
  public String getReading() {
    return dictionary.getReading(wordId, surfaceForm, offset, length);
  }

  /**
   * @return pronunciation. null if token doesn't have pronunciation.
   */
  public String getPronunciation() {
    return dictionary.getPronunciation(wordId, surfaceForm, offset, length);
  }

  /**
   * @return part of speech.
   */
  public String getPartOfSpeech() {
    return dictionary.getPartOfSpeech(wordId);
  }

  /**
   * @return inflection type or null
   */
  public String getInflectionType() {
    return dictionary.getInflectionType(wordId);
  }

  /**
   * @return inflection form or null
   */
  public String getInflectionForm() {
    return dictionary.getInflectionForm(wordId);
  }

  /**
   * @return base form or null if token is not inflected
   */
  public String getBaseForm() {
    return dictionary.getBaseForm(wordId, surfaceForm, offset, length);
  }

  /**
   * Returns the type of this token
   * @return token type, not null
   */
  public Type getType() {
    return type;
  }

  /**
   * Returns true if this token is known word
   * @return true if this token is in standard dictionary. false if not.
   */
  public boolean isKnown() {
    return type == Type.KNOWN;
  }

  /**
   * Returns true if this token is unknown word
   * @return true if this token is unknown word. false if not.
   */
  public boolean isUnknown() {
    return type == Type.UNKNOWN;
  }

  /**
   * Returns true if this token is defined in user dictionary
   * @return true if this token is in user dictionary. false if not.
   */
  public boolean isUser() {
    return type == Type.USER;
  }

  /**
   * Get index of this token in input text
   * @return position of token
   */
  public int getPosition() {
    return position;
  }

  /**
   * Set the position length (in tokens) of this token.  For normal
   * tokens this is 1; for compound tokens it's > 1.
   */
  public void setPositionLength(int positionLength) {
    this.positionLength = positionLength;
  }

  /**
   * Get the length (in tokens) of this token.  For normal
   * tokens this is 1; for compound tokens it's > 1.
   * @return position length of token
   */
  public int getPositionLength() {
    return positionLength;
  }
}