package org.apache.lucene.analysis.standard.std40;

/*
 * 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.
 */

import java.io.IOException;

import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.TypeAttribute;
import org.apache.lucene.util.AttributeFactory;
import org.apache.lucene.util.AttributeSource;

/** Backcompat uax29 tokenizer for Lucene 4.0-4.6. This supports Unicode 6.1.
 *
 * @deprecated Use {@link org.apache.lucene.analysis.standard.UAX29URLEmailTokenizer}
 */
@Deprecated
public final class UAX29URLEmailTokenizer40 extends Tokenizer {
  /** A private instance of the JFlex-constructed scanner */
  private final UAX29URLEmailTokenizerImpl40 scanner;
  
  public static final int ALPHANUM          = 0;
  public static final int NUM               = 1;
  public static final int SOUTHEAST_ASIAN   = 2;
  public static final int IDEOGRAPHIC       = 3;
  public static final int HIRAGANA          = 4;
  public static final int KATAKANA          = 5;
  public static final int HANGUL            = 6;
  public static final int URL               = 7;
  public static final int EMAIL             = 8;

  /** String token types that correspond to token type int constants */
  public static final String [] TOKEN_TYPES = new String [] {
      StandardTokenizer40.TOKEN_TYPES[StandardTokenizer40.ALPHANUM],
      StandardTokenizer40.TOKEN_TYPES[StandardTokenizer40.NUM],
      StandardTokenizer40.TOKEN_TYPES[StandardTokenizer40.SOUTHEAST_ASIAN],
      StandardTokenizer40.TOKEN_TYPES[StandardTokenizer40.IDEOGRAPHIC],
      StandardTokenizer40.TOKEN_TYPES[StandardTokenizer40.HIRAGANA],
      StandardTokenizer40.TOKEN_TYPES[StandardTokenizer40.KATAKANA],
      StandardTokenizer40.TOKEN_TYPES[StandardTokenizer40.HANGUL],
    "<URL>",
    "<EMAIL>",
  };

  private int maxTokenLength = StandardAnalyzer.DEFAULT_MAX_TOKEN_LENGTH;

  /** Set the max allowed token length.  Any token longer
   *  than this is skipped. */
  public void setMaxTokenLength(int length) {
    this.maxTokenLength = length;
  }

  /** @see #setMaxTokenLength */
  public int getMaxTokenLength() {
    return maxTokenLength;
  }

  /**
   * Creates a new instance of the UAX29URLEmailTokenizer.  Attaches
   * the <code>input</code> to the newly created JFlex scanner.
   */
  public UAX29URLEmailTokenizer40() {
    scanner = new UAX29URLEmailTokenizerImpl40(input);
  }

  /**
   * Creates a new UAX29URLEmailTokenizer with a given {@link AttributeSource}. 
   */
  public UAX29URLEmailTokenizer40(AttributeFactory factory) {
    super(factory);
    scanner = new UAX29URLEmailTokenizerImpl40(input);
  }

  // this tokenizer generates three attributes:
  // term offset, positionIncrement and type
  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
  private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
  private final PositionIncrementAttribute posIncrAtt = addAttribute(PositionIncrementAttribute.class);
  private final TypeAttribute typeAtt = addAttribute(TypeAttribute.class);

  @Override
  public final boolean incrementToken() throws IOException {
    clearAttributes();
    int posIncr = 1;

    while(true) {
      int tokenType = scanner.getNextToken();

      if (tokenType == UAX29URLEmailTokenizerImpl40.YYEOF) {
        return false;
      }

      if (scanner.yylength() <= maxTokenLength) {
        posIncrAtt.setPositionIncrement(posIncr);
        scanner.getText(termAtt);
        final int start = scanner.yychar();
        offsetAtt.setOffset(correctOffset(start), correctOffset(start+termAtt.length()));
        typeAtt.setType(TOKEN_TYPES[tokenType]);
        return true;
      } else
        // When we skip a too-long term, we still increment the
        // position increment
        posIncr++;
    }
  }
  
  @Override
  public final void end() throws IOException {
    super.end();
    // set final offset
    int finalOffset = correctOffset(scanner.yychar() + scanner.yylength());
    offsetAtt.setOffset(finalOffset, finalOffset);
  }

  @Override
  public void close() throws IOException {
    super.close();
    scanner.yyreset(input);
  }

  @Override
  public void reset() throws IOException {
    super.reset();
    scanner.yyreset(input);
  }
}
