| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| package org.apache.lucene.index; |
| |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.lucene.util.BytesRef; |
| |
| /** |
| * Exposes flex API, merged from flex API of sub-segments, |
| * remapping docIDs (this is used for segment merging). |
| * |
| * @lucene.experimental |
| */ |
| |
| final class MappingMultiPostingsEnum extends PostingsEnum { |
| MultiPostingsEnum multiDocsAndPositionsEnum; |
| final String field; |
| final DocIDMerger<MappingPostingsSub> docIDMerger; |
| private MappingPostingsSub current; |
| private final MappingPostingsSub[] allSubs; |
| private final List<MappingPostingsSub> subs = new ArrayList<>(); |
| |
| private static class MappingPostingsSub extends DocIDMerger.Sub { |
| public PostingsEnum postings; |
| |
| public MappingPostingsSub(MergeState.DocMap docMap) { |
| super(docMap); |
| } |
| |
| @Override |
| public int nextDoc() { |
| try { |
| return postings.nextDoc(); |
| } catch (IOException ioe) { |
| throw new RuntimeException(ioe); |
| } |
| } |
| } |
| |
| /** Sole constructor. */ |
| public MappingMultiPostingsEnum(String field, MergeState mergeState) throws IOException { |
| this.field = field; |
| allSubs = new MappingPostingsSub[mergeState.fieldsProducers.length]; |
| for(int i=0;i<allSubs.length;i++) { |
| allSubs[i] = new MappingPostingsSub(mergeState.docMaps[i]); |
| } |
| this.docIDMerger = DocIDMerger.of(subs, allSubs.length, mergeState.needsIndexSort); |
| } |
| |
| MappingMultiPostingsEnum reset(MultiPostingsEnum postingsEnum) throws IOException { |
| this.multiDocsAndPositionsEnum = postingsEnum; |
| MultiPostingsEnum.EnumWithSlice[] subsArray = postingsEnum.getSubs(); |
| int count = postingsEnum.getNumSubs(); |
| subs.clear(); |
| for(int i=0;i<count;i++) { |
| MappingPostingsSub sub = allSubs[subsArray[i].slice.readerIndex]; |
| sub.postings = subsArray[i].postingsEnum; |
| subs.add(sub); |
| } |
| docIDMerger.reset(); |
| return this; |
| } |
| |
| @Override |
| public int freq() throws IOException { |
| return current.postings.freq(); |
| } |
| |
| @Override |
| public int docID() { |
| if (current == null) { |
| return -1; |
| } else { |
| return current.mappedDocID; |
| } |
| } |
| |
| @Override |
| public int advance(int target) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| current = docIDMerger.next(); |
| if (current == null) { |
| return NO_MORE_DOCS; |
| } else { |
| return current.mappedDocID; |
| } |
| } |
| |
| @Override |
| public int nextPosition() throws IOException { |
| int pos = current.postings.nextPosition(); |
| if (pos < 0) { |
| throw new CorruptIndexException("position=" + pos + " is negative, field=\"" + field + " doc=" + current.mappedDocID, |
| current.postings.toString()); |
| } else if (pos > IndexWriter.MAX_POSITION) { |
| throw new CorruptIndexException("position=" + pos + " is too large (> IndexWriter.MAX_POSITION=" + IndexWriter.MAX_POSITION + "), field=\"" + field + "\" doc=" + current.mappedDocID, |
| current.postings.toString()); |
| } |
| return pos; |
| } |
| |
| @Override |
| public int startOffset() throws IOException { |
| return current.postings.startOffset(); |
| } |
| |
| @Override |
| public int endOffset() throws IOException { |
| return current.postings.endOffset(); |
| } |
| |
| @Override |
| public BytesRef getPayload() throws IOException { |
| return current.postings.getPayload(); |
| } |
| |
| @Override |
| public long cost() { |
| long cost = 0; |
| for (MappingPostingsSub sub : subs) { |
| cost += sub.postings.cost(); |
| } |
| return cost; |
| } |
| } |
| |