122 lines
4.0 KiB
Java
122 lines
4.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package it.cavallium.dbengine.lucene.comparators;
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import it.cavallium.dbengine.database.disk.LLTempLMDBEnv;
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import it.cavallium.dbengine.lucene.IArray;
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import it.cavallium.dbengine.lucene.IntCodec;
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import it.cavallium.dbengine.lucene.LMDBArray;
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import it.cavallium.dbengine.lucene.LongCodec;
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import java.io.IOException;
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import org.apache.lucene.document.LongPoint;
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import org.apache.lucene.index.LeafReaderContext;
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import org.apache.lucene.search.LeafFieldComparator;
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/**
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* Comparator based on {@link Long#compare} for {@code numHits}. This comparator provides a skipping
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* functionality – an iterator that can skip over non-competitive documents.
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*/
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public class LongComparator extends NumericComparator<Long> {
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private final IArray<Long> values;
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protected long topValue;
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protected long bottom;
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public LongComparator(LLTempLMDBEnv env,
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int numHits, String field, Long missingValue, boolean reverse, int sortPos) {
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super(field, missingValue != null ? missingValue : 0L, reverse, sortPos, Long.BYTES);
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values = new LMDBArray<>(env, new LongCodec(), numHits, 0L);
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}
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@Override
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public int compare(int slot1, int slot2) {
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return Long.compare(values.getOrDefault(slot1, 0L), values.getOrDefault(slot2, 0L));
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}
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@Override
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public void setTopValue(Long value) {
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super.setTopValue(value);
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topValue = value;
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}
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@Override
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public Long value(int slot) {
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return values.getOrDefault(slot, 0L);
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}
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@Override
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public LeafFieldComparator getLeafComparator(LeafReaderContext context) throws IOException {
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return new LongLeafComparator(context);
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}
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/** Leaf comparator for {@link LongComparator} that provides skipping functionality */
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public class LongLeafComparator extends NumericLeafComparator {
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public LongLeafComparator(LeafReaderContext context) throws IOException {
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super(context);
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}
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private long getValueForDoc(int doc) throws IOException {
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if (docValues.advanceExact(doc)) {
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return docValues.longValue();
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} else {
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return missingValue;
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}
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}
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@Override
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public void setBottom(int slot) throws IOException {
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bottom = values.getOrDefault(slot, 0L);
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super.setBottom(slot);
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}
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@Override
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public int compareBottom(int doc) throws IOException {
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return Long.compare(bottom, getValueForDoc(doc));
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}
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@Override
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public int compareTop(int doc) throws IOException {
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return Long.compare(topValue, getValueForDoc(doc));
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}
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@Override
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public void copy(int slot, int doc) throws IOException {
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values.set(slot, getValueForDoc(doc));
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super.copy(slot, doc);
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}
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@Override
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protected boolean isMissingValueCompetitive() {
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int result = Long.compare(missingValue, bottom);
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// in reverse (desc) sort missingValue is competitive when it's greater or equal to bottom,
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// in asc sort missingValue is competitive when it's smaller or equal to bottom
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return reverse ? (result >= 0) : (result <= 0);
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}
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@Override
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protected void encodeBottom(byte[] packedValue) {
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LongPoint.encodeDimension(bottom, packedValue, 0);
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}
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@Override
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protected void encodeTop(byte[] packedValue) {
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LongPoint.encodeDimension(topValue, packedValue, 0);
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}
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}
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}
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