| /* |
| * 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 static org.apache.lucene.index.FilterLeafReader.FilterFields; |
| import static org.apache.lucene.index.FilterLeafReader.FilterTerms; |
| import static org.apache.lucene.index.FilterLeafReader.FilterTermsEnum; |
| |
| /** A {@link Fields} implementation that merges multiple |
| * Fields into one, and maps around deleted documents. |
| * This is used for merging. |
| * @lucene.internal |
| */ |
| public class MappedMultiFields extends FilterFields { |
| final MergeState mergeState; |
| |
| /** Create a new MappedMultiFields for merging, based on the supplied |
| * mergestate and merged view of terms. */ |
| public MappedMultiFields(MergeState mergeState, MultiFields multiFields) { |
| super(multiFields); |
| this.mergeState = mergeState; |
| } |
| |
| @Override |
| public Terms terms(String field) throws IOException { |
| MultiTerms terms = (MultiTerms) in.terms(field); |
| if (terms == null) { |
| return null; |
| } else { |
| return new MappedMultiTerms(field, mergeState, terms); |
| } |
| } |
| |
| private static class MappedMultiTerms extends FilterTerms { |
| final MergeState mergeState; |
| final String field; |
| |
| public MappedMultiTerms(String field, MergeState mergeState, MultiTerms multiTerms) { |
| super(multiTerms); |
| this.field = field; |
| this.mergeState = mergeState; |
| } |
| |
| @Override |
| public TermsEnum iterator() throws IOException { |
| TermsEnum iterator = in.iterator(); |
| if (iterator == TermsEnum.EMPTY) { |
| // LUCENE-6826 |
| return TermsEnum.EMPTY; |
| } else { |
| return new MappedMultiTermsEnum(field, mergeState, (MultiTermsEnum) iterator); |
| } |
| } |
| |
| @Override |
| public long size() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long getSumTotalTermFreq() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long getSumDocFreq() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int getDocCount() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| private static class MappedMultiTermsEnum extends FilterTermsEnum { |
| final MergeState mergeState; |
| final String field; |
| |
| public MappedMultiTermsEnum(String field, MergeState mergeState, MultiTermsEnum multiTermsEnum) { |
| super(multiTermsEnum); |
| this.field = field; |
| this.mergeState = mergeState; |
| } |
| |
| @Override |
| public int docFreq() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long totalTermFreq() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public PostingsEnum postings(PostingsEnum reuse, int flags) throws IOException { |
| MappingMultiPostingsEnum mappingDocsAndPositionsEnum; |
| if (reuse instanceof MappingMultiPostingsEnum) { |
| MappingMultiPostingsEnum postings = (MappingMultiPostingsEnum) reuse; |
| if (postings.field.equals(this.field)) { |
| mappingDocsAndPositionsEnum = postings; |
| } else { |
| mappingDocsAndPositionsEnum = new MappingMultiPostingsEnum(field, mergeState); |
| } |
| } else { |
| mappingDocsAndPositionsEnum = new MappingMultiPostingsEnum(field, mergeState); |
| } |
| |
| MultiPostingsEnum docsAndPositionsEnum = (MultiPostingsEnum) in.postings(mappingDocsAndPositionsEnum.multiDocsAndPositionsEnum, flags); |
| mappingDocsAndPositionsEnum.reset(docsAndPositionsEnum); |
| return mappingDocsAndPositionsEnum; |
| } |
| } |
| } |