| /** |
| * 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.blur.manager.writer; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.blur.utils.BlurConstants; |
| import org.apache.lucene.index.AtomicReader; |
| import org.apache.lucene.index.AtomicReaderContext; |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.Terms; |
| import org.apache.lucene.index.TermsEnum; |
| import org.apache.lucene.util.Bits; |
| import org.apache.lucene.util.BytesRef; |
| |
| public class MergeSortRowIdLookup { |
| |
| public interface Action { |
| void found(AtomicReader reader, Bits liveDocs, TermsEnum termsEnum) throws IOException; |
| } |
| |
| private final List<TermsEnumReader> _termsEnumList = new ArrayList<TermsEnumReader>(); |
| |
| public MergeSortRowIdLookup(IndexReader indexReader) throws IOException { |
| if (indexReader instanceof AtomicReader) { |
| addAtomicReader((AtomicReader) indexReader); |
| } else { |
| for (AtomicReaderContext context : indexReader.leaves()) { |
| addAtomicReader(context.reader()); |
| } |
| } |
| } |
| |
| private void addAtomicReader(AtomicReader atomicReader) throws IOException { |
| Terms terms = atomicReader.fields().terms(BlurConstants.ROW_ID); |
| TermsEnum termsEnum = terms.iterator(null); |
| _termsEnumList.add(new TermsEnumReader(termsEnum, atomicReader)); |
| } |
| |
| public void lookup(BytesRef rowId, Action action) throws IOException { |
| advance(_termsEnumList, rowId); |
| sort(_termsEnumList); |
| for (TermsEnumReader reader : _termsEnumList) { |
| if (reader._termsEnum.term().equals(rowId)) { |
| action.found(reader._reader, reader._liveDocs, reader._termsEnum); |
| } |
| } |
| } |
| |
| private static void advance(List<TermsEnumReader> termsEnumList, BytesRef rowId) throws IOException { |
| for (TermsEnumReader reader : termsEnumList) { |
| BytesRef term = reader._termsEnum.term(); |
| if (term.compareTo(rowId) < 0) { |
| reader._termsEnum.seekCeil(rowId); |
| } |
| } |
| } |
| |
| private static void sort(List<TermsEnumReader> termsEnumList) { |
| Collections.sort(termsEnumList); |
| } |
| |
| private static class TermsEnumReader implements Comparable<TermsEnumReader> { |
| |
| final Bits _liveDocs; |
| final TermsEnum _termsEnum; |
| final AtomicReader _reader; |
| |
| TermsEnumReader(TermsEnum termsEnum, AtomicReader reader) { |
| _termsEnum = termsEnum; |
| _reader = reader; |
| _liveDocs = reader.getLiveDocs(); |
| } |
| |
| @Override |
| public int compareTo(TermsEnumReader o) { |
| try { |
| BytesRef t1 = _termsEnum.term(); |
| BytesRef t2 = o._termsEnum.term(); |
| return t1.compareTo(t2); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| |
| } |