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 using System;
  17 namespace Lucene.Net.Index
  18 {
  19
  20         sealed class SegmentMergeInfo
  21         {
  22                 internal Term term;
  23                 internal int base_Renamed;
  24                 internal TermEnum termEnum;
  25                 internal IndexReader reader;
  26                 internal TermPositions postings;
  27                 internal int[] docMap = null; // maps around deleted docs
  28
  29                 internal SegmentMergeInfo(int b, TermEnum te, IndexReader r)
  30                 {
  31                         base_Renamed = b;
  32                         reader = r;
  33                         termEnum = te;
  34                         term = te.Term();
  35                         postings = reader.TermPositions();
  36
  37                         // build array which maps document numbers around deletions
  38                         if (reader.HasDeletions())
  39                         {
  40                                 int maxDoc = reader.MaxDoc();
  41                                 docMap = new int[maxDoc];
  42                                 int j = 0;
  43                                 for (int i = 0; i < maxDoc; i++)
  44                                 {
  45                                         if (reader.IsDeleted(i))
  46                                                 docMap[i] = - 1;
  47                                         else
  48                                                 docMap[i] = j++;
  49                                 }
  50                         }
  51                 }
  52
  53                 internal bool Next()
  54                 {
  55                         if (termEnum.Next())
  56                         {
  57                                 term = termEnum.Term();
  58                                 return true;
  59                         }
  60                         else
  61                         {
  62                                 term = null;
  63                                 return false;
  64                         }
  65                 }
  66
  67                 internal void  Close()
  68                 {
  69                         termEnum.Close();
  70                         postings.Close();
  71                 }
  72         }
  73 }