package org.apache.lucene.index;/** * Copyright 2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *     http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import java.io.IOException;final class SegmentMergeInfo {  Term term;  int base;  TermEnum termEnum;  IndexReader reader;  private TermPositions postings;  // use getPositions()  private int[] docMap;  // use getDocMap()  SegmentMergeInfo(int b, TermEnum te, IndexReader r)    throws IOException {    base = b;    reader = r;    termEnum = te;    term = te.term();  }  // maps around deleted docs  int[] getDocMap() {    if (docMap == null) {    // build array which maps document numbers around deletions     if (reader.hasDeletions()) {      int maxDoc = reader.maxDoc();      docMap = new int[maxDoc];      int j = 0;      for (int i = 0; i < maxDoc; i++) {        if (reader.isDeleted(i))          docMap[i] = -1;        else          docMap[i] = j++;      }    }  }    return docMap;  }  TermPositions getPositions() throws IOException {    if (postings == null) {      postings = reader.termPositions();    }    return postings;  }  final boolean next() throws IOException {    if (termEnum.next()) {      term = termEnum.term();      return true;    } else {      term = null;      return false;    }  }  final void close() throws IOException {    termEnum.close();    if (postings != null) {    postings.close();  }}}