beagled/Lucene.Net/Index/SegmentTermPositionVector.cs

   1 /*
   2  * Copyright 2004 The Apache Software Foundation
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 using System;
  17 namespace Lucene.Net.Index
  18 {
  19
  20     public class SegmentTermPositionVector : SegmentTermVector, TermPositionVector
  21     {
  22         protected internal int[][] positions;
  23         protected internal TermVectorOffsetInfo[][] offsets;
  24         public static readonly int[] EMPTY_TERM_POS = new int[0];
  25
  26         public SegmentTermPositionVector(System.String field, System.String[] terms, int[] termFreqs, int[][] positions, TermVectorOffsetInfo[][] offsets):base(field, terms, termFreqs)
  27         {
  28             this.offsets = offsets;
  29             this.positions = positions;
  30         }
  31
  32         /// <summary> Returns an array of TermVectorOffsetInfo in which the term is found.
  33         ///
  34         /// </summary>
  35         /// <param name="index">The position in the array to get the offsets from
  36         /// </param>
  37         /// <returns> An array of TermVectorOffsetInfo objects or the empty list
  38         /// </returns>
  39         /// <seealso cref="Lucene.Net.analysis.Token">
  40         /// </seealso>
  41         public virtual TermVectorOffsetInfo[] GetOffsets(int index)
  42         {
  43             TermVectorOffsetInfo[] result = TermVectorOffsetInfo.EMPTY_OFFSET_INFO;
  44             if (offsets == null)
  45                 return null;
  46             if (index >= 0 && index < offsets.Length)
  47             {
  48                 result = offsets[index];
  49             }
  50             return result;
  51         }
  52
  53         /// <summary> Returns an array of positions in which the term is found.
  54         /// Terms are identified by the index at which its number appears in the
  55         /// term String array obtained from the <code>indexOf</code> method.
  56         /// </summary>
  57         public virtual int[] GetTermPositions(int index)
  58         {
  59             int[] result = EMPTY_TERM_POS;
  60             if (positions == null)
  61                 return null;
  62             if (index >= 0 && index < positions.Length)
  63             {
  64                 result = positions[index];
  65             }
  66
  67             return result;
  68         }
  69     }
  70 }