Lucene.Net/Index/SegmentMergeInfo.cs

   1 using Lucene.Net.Util;
   2
   3 namespace Lucene.Net.Index
   4 {
   5         /* ====================================================================
   6          * The Apache Software License, Version 1.1
   7          *
   8          * Copyright (c) 2001 The Apache Software Foundation.  All rights
   9          * reserved.
  10          *
  11          * Redistribution and use in source and binary forms, with or without
  12          * modification, are permitted provided that the following conditions
  13          * are met:
  14          *
  15          * 1. Redistributions of source code must retain the above copyright
  16          *    notice, this list of conditions and the following disclaimer.
  17          *
  18          * 2. Redistributions in binary form must reproduce the above copyright
  19          *    notice, this list of conditions and the following disclaimer in
  20          *    the documentation and/or other materials provided with the
  21          *    distribution.
  22          *
  23          * 3. The end-user documentation included with the redistribution,
  24          *    if any, must include the following acknowledgment:
  25          *       "This product includes software developed by the
  26          *        Apache Software Foundation (http://www.apache.org/)."
  27          *    Alternately, this acknowledgment may appear in the software itself,
  28          *    if and wherever such third-party acknowledgments normally appear.
  29          *
  30          * 4. The names "Apache" and "Apache Software Foundation" and
  31          *    "Apache Lucene" must not be used to endorse or promote products
  32          *    derived from this software without prior written permission. For
  33          *    written permission, please contact apache@apache.org.
  34          *
  35          * 5. Products derived from this software may not be called "Apache",
  36          *    "Apache Lucene", nor may "Apache" appear in their name, without
  37          *    prior written permission of the Apache Software Foundation.
  38          *
  39          * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  40          * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  41          * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  42          * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
  43          * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44          * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  45          * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  46          * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  47          * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  48          * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  49          * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50          * SUCH DAMAGE.
  51          * ====================================================================
  52          *
  53          * This software consists of voluntary contributions made by many
  54          * individuals on behalf of the Apache Software Foundation.  For more
  55          * information on the Apache Software Foundation, please see
  56          * <http://www.apache.org/>.
  57          */
  58
  59         sealed class SegmentMergeInfo
  60         {
  61                 internal Term term;
  62                 internal int _base;
  63                 internal TermEnum termEnum;
  64                 internal IndexReader reader;
  65                 internal TermPositions postings;
  66                 internal int[] docMap = null;                             // maps around deleted docs
  67
  68                 internal SegmentMergeInfo(int b, TermEnum te, IndexReader r)
  69                 {
  70                         _base = b;
  71                         reader = r;
  72                         termEnum = te;
  73                         term = te.Term();
  74                         postings = reader.TermPositions();
  75
  76                         if (reader.HasDeletions())
  77                         {
  78                                 // build array which maps document numbers around deletions
  79                                 int maxDoc = reader.MaxDoc();
  80                                 docMap = new int[maxDoc];
  81                                 int j = 0;
  82                                 for (int i = 0; i < maxDoc; i++)
  83                                 {
  84                                         if (reader.IsDeleted(i))
  85                                                 docMap[i] = -1;
  86                                         else
  87                                                 docMap[i] = j++;
  88                                 }
  89                         }
  90                 }
  91
  92                 internal bool Next()
  93                 {
  94                         if (termEnum.Next())
  95                         {
  96                                 term = termEnum.Term();
  97                                 return true;
  98                         }
  99                         else
 100                         {
 101                                 term = null;
 102                                 return false;
 103                         }
 104                 }
 105
 106                 internal void Close()
 107                 {
 108                         termEnum.Close();
 109                         postings.Close();
 110                 }
 111         }
 112 }