| package org.apache.lucene.index; |
| |
| /* |
| * 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. |
| */ |
| |
| import org.apache.lucene.index.MultiDocsEnum.EnumWithSlice; |
| |
| import java.io.IOException; |
| |
| /** |
| * Exposes flex API, merged from flex API of sub-segments, |
| * remapping docIDs (this is used for segment merging). |
| * |
| * @lucene.experimental |
| */ |
| |
| final class MappingMultiDocsEnum extends DocsEnum { |
| private MultiDocsEnum.EnumWithSlice[] subs; |
| int numSubs; |
| int upto; |
| MergeState.DocMap currentMap; |
| DocsEnum current; |
| int currentBase; |
| int doc = -1; |
| private final MergeState mergeState; |
| MultiDocsEnum multiDocsEnum; |
| |
| /** Sole constructor. */ |
| public MappingMultiDocsEnum(MergeState mergeState) { |
| this.mergeState = mergeState; |
| } |
| |
| MappingMultiDocsEnum reset(MultiDocsEnum docsEnum) { |
| this.numSubs = docsEnum.getNumSubs(); |
| this.subs = docsEnum.getSubs(); |
| this.multiDocsEnum = docsEnum; |
| upto = -1; |
| current = null; |
| return this; |
| } |
| |
| /** How many sub-readers we are merging. |
| * @see #getSubs */ |
| public int getNumSubs() { |
| return numSubs; |
| } |
| |
| /** Returns sub-readers we are merging. */ |
| public EnumWithSlice[] getSubs() { |
| return subs; |
| } |
| |
| @Override |
| public int freq() throws IOException { |
| return current.freq(); |
| } |
| |
| @Override |
| public int docID() { |
| return doc; |
| } |
| |
| @Override |
| public int advance(int target) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| while(true) { |
| if (current == null) { |
| if (upto == numSubs-1) { |
| return this.doc = NO_MORE_DOCS; |
| } else { |
| upto++; |
| final int reader = subs[upto].slice.readerIndex; |
| current = subs[upto].docsEnum; |
| currentBase = mergeState.docBase[reader]; |
| currentMap = mergeState.docMaps[reader]; |
| assert currentMap.maxDoc() == subs[upto].slice.length: "readerIndex=" + reader + " subs.len=" + subs.length + " len1=" + currentMap.maxDoc() + " vs " + subs[upto].slice.length; |
| } |
| } |
| |
| int doc = current.nextDoc(); |
| if (doc != NO_MORE_DOCS) { |
| |
| mergeState.checkAbortCount++; |
| if (mergeState.checkAbortCount > 60000) { |
| mergeState.checkAbort.work(mergeState.checkAbortCount/5.0); |
| mergeState.checkAbortCount = 0; |
| } |
| |
| // compact deletions |
| doc = currentMap.get(doc); |
| if (doc == -1) { |
| continue; |
| } |
| return this.doc = currentBase + doc; |
| } else { |
| current = null; |
| } |
| } |
| } |
| |
| @Override |
| public long cost() { |
| long cost = 0; |
| for (EnumWithSlice enumWithSlice : subs) { |
| cost += enumWithSlice.docsEnum.cost(); |
| } |
| return cost; |
| } |
| } |
| |