content: /**
   * 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.solr.analysis;
  
  import org.apache.lucene.analysis.NumericTokenStream;
  import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
  import org.apache.lucene.analysis.Tokenizer;
  import org.apache.solr.common.SolrException;
  import org.apache.solr.schema.DateField;
  import static org.apache.solr.schema.TrieField.TrieTypes;
  
  import java.io.IOException;
  import java.io.Reader;
  
  /**
   * Tokenizer for trie fields. It uses NumericTokenStream to create multiple trie encoded string per number.
   * Each string created by this tokenizer for a given number differs from the previous by the given precisionStep.
   * For query time token streams that only contain the highest precision term, use 32/64 as precisionStep.
   * <p/>
   * Refer to {@link org.apache.lucene.search.NumericRangeQuery} for more details.
   *
   * @version $Id: TrieTokenizerFactory.java 1061000 2011-01-19 21:29:17Z uschindler $
   * @see org.apache.lucene.search.NumericRangeQuery
   * @see org.apache.solr.schema.TrieField
   * @since solr 1.4
   */
  public class TrieTokenizerFactory extends BaseTokenizerFactory {
    protected final int precisionStep;
    protected final TrieTypes type;
  
    public TrieTokenizerFactory(TrieTypes type, int precisionStep) {
      this.type = type;
      this.precisionStep = precisionStep;
    }
  
    public TrieTokenizer create(Reader input) {
      return new TrieTokenizer(input, type, precisionStep, TrieTokenizer.getNumericTokenStream(precisionStep));
    }
  }
  
  final class TrieTokenizer extends Tokenizer {
    protected static final DateField dateField = new DateField();
    protected final int precisionStep;
    protected final TrieTypes type;
    protected final NumericTokenStream ts;
    
    protected final OffsetAttribute ofsAtt = addAttribute(OffsetAttribute.class);
    protected int startOfs, endOfs;
  
    static NumericTokenStream getNumericTokenStream(int precisionStep) {
      return new NumericTokenStream(precisionStep);
    }
  
    public TrieTokenizer(Reader input, TrieTypes type, int precisionStep, NumericTokenStream ts) {
      // must share the attribute source with the NumericTokenStream we delegate to
      super(ts);
      this.type = type;
      this.precisionStep = precisionStep;
      this.ts = ts;
  
     try {
       reset(input);
     } catch (IOException e) {
       throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Unable to create TrieIndexTokenizer", e);
     }
    }
  
    @Override
    public void reset(Reader input) throws IOException {
     try {
        super.reset(input);
        input = super.input;
        char[] buf = new char[32];
        int len = input.read(buf);
        this.startOfs = correctOffset(0);
        this.endOfs = correctOffset(len);
        String v = new String(buf, 0, len);
        switch (type) {
          case INTEGER:
            ts.setIntValue(Integer.parseInt(v));
            break;
          case FLOAT:
            ts.setFloatValue(Float.parseFloat(v));
            break;
          case LONG:
            ts.setLongValue(Long.parseLong(v));
            break;
          case DOUBLE:
            ts.setDoubleValue(Double.parseDouble(v));
            break;
          case DATE:
            ts.setLongValue(dateField.parseMath(null, v).getTime());
            break;
          default:
            throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Unknown type for trie field");
        }
      } catch (IOException e) {
        throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Unable to create TrieIndexTokenizer", e);
      }
    }
  
    @Override
    public void close() throws IOException {
      super.close();
      ts.close();
    }
    
    @Override
    public void reset() throws IOException {
      super.reset();
      ts.reset();
    }
  
    @Override
    public boolean incrementToken() throws IOException {
      if (ts.incrementToken()) {
        ofsAtt.setOffset(startOfs, endOfs);
        return true;
      }
      return false;
    }
  
    @Override
    public void end() throws IOException {
      ts.end();
      ofsAtt.setOffset(endOfs, endOfs);
    }
  }
  