beagled/Lucene.Net/Index/SegmentMergeInfo.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         sealed class SegmentMergeInfo
  23         {
  24                 internal Term term;
  25                 internal int base_Renamed;
  26                 internal TermEnum termEnum;
  27                 internal IndexReader reader;
  28                 private TermPositions postings; // use getPositions()
  29                 private int[] docMap; // use getDocMap()
  30
  31                 internal SegmentMergeInfo(int b, TermEnum te, IndexReader r)
  32                 {
  33                         base_Renamed = b;
  34                         reader = r;
  35                         termEnum = te;
  36                         term = te.Term();
  37                 }
  38
  39                 // maps around deleted docs
  40                 internal int[] GetDocMap()
  41                 {
  42                         if (docMap == null)
  43                         {
  44                                 // build array which maps document numbers around deletions
  45                                 if (reader.HasDeletions())
  46                                 {
  47                                         int maxDoc = reader.MaxDoc();
  48                                         docMap = new int[maxDoc];
  49                                         int j = 0;
  50                                         for (int i = 0; i < maxDoc; i++)
  51                                         {
  52                                                 if (reader.IsDeleted(i))
  53                                                         docMap[i] = - 1;
  54                                                 else
  55                                                         docMap[i] = j++;
  56                                         }
  57                                 }
  58                         }
  59                         return docMap;
  60                 }
  61
  62                 internal TermPositions GetPositions()
  63                 {
  64                         if (postings == null)
  65                         {
  66                                 postings = reader.TermPositions();
  67                         }
  68                         return postings;
  69                 }
  70
  71                 internal bool Next()
  72                 {
  73                         if (termEnum.Next())
  74                         {
  75                                 term = termEnum.Term();
  76                                 return true;
  77                         }
  78                         else
  79                         {
  80                                 term = null;
  81                                 return false;
  82                         }
  83                 }
  84
  85                 internal void  Close()
  86                 {
  87                         termEnum.Close();
  88                         if (postings != null)
  89                         {
  90                                 postings.Close();
  91                         }
  92                 }
  93         }
  94 }