content: 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.
   */
  
  /** Extends <code>TermFreqVector</code> to provide additional information about
   *  positions in which each of the terms is found. A TermPositionVector not necessarily
   * contains both positions and offsets, but at least one of these arrays exists.
   */
  public interface TermPositionVector extends TermFreqVector {
    
      /** 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</code> method.
       *  May return null if positions have not been stored.
       */
      public int[] getTermPositions(int index);
    
      /**
       * Returns an array of TermVectorOffsetInfo in which the term is found.
       * May return null if offsets have not been stored.
       * 
       * @see org.apache.lucene.analysis.Token
       * 
       * @param index The position in the array to get the offsets from
       * @return An array of TermVectorOffsetInfo objects or the empty list
       */ 
      public TermVectorOffsetInfo [] getOffsets(int index);
  }