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
  17 using System;
  18
  19 namespace Lucene.Net.Index
  20 {
  21
  22         public class SegmentTermPositionVector : SegmentTermVector, TermPositionVector
  23         {
  24                 protected internal int[][] positions;
  25                 protected internal TermVectorOffsetInfo[][] offsets;
  26                 public static readonly int[] EMPTY_TERM_POS = new int[0];
  27
  28                 public SegmentTermPositionVector(System.String field, System.String[] terms, int[] termFreqs, int[][] positions, TermVectorOffsetInfo[][] offsets):base(field, terms, termFreqs)
  29                 {
  30                         this.offsets = offsets;
  31                         this.positions = positions;
  32                 }
  33
  34                 /// <summary> Returns an array of TermVectorOffsetInfo in which the term is found.
  35                 ///
  36                 /// </summary>
  37                 /// <param name="index">The position in the array to get the offsets from
  38                 /// </param>
  39                 /// <returns> An array of TermVectorOffsetInfo objects or the empty list
  40                 /// </returns>
  41                 /// <seealso cref="Lucene.Net.analysis.Token">
  42                 /// </seealso>
  43                 public virtual TermVectorOffsetInfo[] GetOffsets(int index)
  44                 {
  45                         TermVectorOffsetInfo[] result = TermVectorOffsetInfo.EMPTY_OFFSET_INFO;
  46                         if (offsets == null)
  47                                 return null;
  48                         if (index >= 0 && index < offsets.Length)
  49                         {
  50                                 result = offsets[index];
  51                         }
  52                         return result;
  53                 }
  54
  55                 /// <summary> Returns an array of positions in which the term is found.
  56                 /// Terms are identified by the index at which its number appears in the
  57                 /// term String array obtained from the <code>indexOf</code> method.
  58                 /// </summary>
  59                 public virtual int[] GetTermPositions(int index)
  60                 {
  61                         int[] result = EMPTY_TERM_POS;
  62                         if (positions == null)
  63                                 return null;
  64                         if (index >= 0 && index < positions.Length)
  65                         {
  66                                 result = positions[index];
  67                         }
  68
  69                         return result;
  70                 }
  71         }
  72 }