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Lucene example source code file (SegmentTermPositionVector.java)

This example Lucene source code file (SegmentTermPositionVector.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

empty_term_pos, empty_term_pos, segmenttermpositionvector, segmenttermpositionvector, segmenttermvector, string, string, termpositionvector, termvectoroffsetinfo, termvectoroffsetinfo

The Lucene SegmentTermPositionVector.java source code

package org.apache.lucene.index;

/**
 * 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.
 */

class SegmentTermPositionVector extends SegmentTermVector implements TermPositionVector {
  protected int[][] positions;
  protected TermVectorOffsetInfo[][] offsets;
  public static final int[] EMPTY_TERM_POS = new int[0];
  
  public SegmentTermPositionVector(String field, String terms[], int termFreqs[], int[][] positions, TermVectorOffsetInfo[][] offsets) {
    super(field, terms, termFreqs);
    this.offsets = offsets;
    this.positions = positions;
  }

  /**
   * Returns an array of TermVectorOffsetInfo in which the term is found.
   *
   * @param index The position in the array to get the offsets from
   * @return An array of TermVectorOffsetInfo objects or the empty list
   * @see org.apache.lucene.analysis.Token
   */
  public TermVectorOffsetInfo[] getOffsets(int index) {
    TermVectorOffsetInfo[] result = TermVectorOffsetInfo.EMPTY_OFFSET_INFO;
    if(offsets == null)
      return null;
    if (index >=0 && index < offsets.length)
    {
      result = offsets[index];
    }
    return result;
  }
  
  /**
   * Returns an array of positions in which the term is found.
   * Terms are identified by the index at which its number appears in the
   * term String array obtained from the <code>indexOf method.
   */
  public int[] getTermPositions(int index) {
    int[] result = EMPTY_TERM_POS;
    if(positions == null)
      return null;
    if (index >=0 && index < positions.length)
    {
      result = positions[index];
    }
    
    return result;
  }
}

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