| package org.apache.lucene.search.join; |
| |
| /* |
| * 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 java.io.IOException; |
| |
| import org.apache.lucene.index.AtomicReaderContext; |
| import org.apache.lucene.index.BinaryDocValues; |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.SortedSetDocValues; |
| import org.apache.lucene.search.LeafCollector; |
| import org.apache.lucene.search.Collector; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.SimpleCollector; |
| import org.apache.lucene.util.ArrayUtil; |
| import org.apache.lucene.util.BytesRef; |
| import org.apache.lucene.util.BytesRefHash; |
| |
| abstract class TermsWithScoreCollector extends SimpleCollector { |
| |
| private final static int INITIAL_ARRAY_SIZE = 256; |
| |
| final String field; |
| final BytesRefHash collectedTerms = new BytesRefHash(); |
| final ScoreMode scoreMode; |
| |
| Scorer scorer; |
| float[] scoreSums = new float[INITIAL_ARRAY_SIZE]; |
| |
| TermsWithScoreCollector(String field, ScoreMode scoreMode) { |
| this.field = field; |
| this.scoreMode = scoreMode; |
| } |
| |
| public BytesRefHash getCollectedTerms() { |
| return collectedTerms; |
| } |
| |
| public float[] getScoresPerTerm() { |
| return scoreSums; |
| } |
| |
| @Override |
| public void setScorer(Scorer scorer) throws IOException { |
| this.scorer = scorer; |
| } |
| |
| @Override |
| public boolean acceptsDocsOutOfOrder() { |
| return true; |
| } |
| |
| /** |
| * Chooses the right {@link TermsWithScoreCollector} implementation. |
| * |
| * @param field The field to collect terms for |
| * @param multipleValuesPerDocument Whether the field to collect terms for has multiple values per document. |
| * @return a {@link TermsWithScoreCollector} instance |
| */ |
| static TermsWithScoreCollector create(String field, boolean multipleValuesPerDocument, ScoreMode scoreMode) { |
| if (multipleValuesPerDocument) { |
| switch (scoreMode) { |
| case Avg: |
| return new MV.Avg(field); |
| default: |
| return new MV(field, scoreMode); |
| } |
| } else { |
| switch (scoreMode) { |
| case Avg: |
| return new SV.Avg(field); |
| default: |
| return new SV(field, scoreMode); |
| } |
| } |
| } |
| |
| // impl that works with single value per document |
| static class SV extends TermsWithScoreCollector { |
| |
| final BytesRef spare = new BytesRef(); |
| BinaryDocValues fromDocTerms; |
| |
| SV(String field, ScoreMode scoreMode) { |
| super(field, scoreMode); |
| } |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| fromDocTerms.get(doc, spare); |
| int ord = collectedTerms.add(spare); |
| if (ord < 0) { |
| ord = -ord - 1; |
| } else { |
| if (ord >= scoreSums.length) { |
| scoreSums = ArrayUtil.grow(scoreSums); |
| } |
| } |
| |
| float current = scorer.score(); |
| float existing = scoreSums[ord]; |
| if (Float.compare(existing, 0.0f) == 0) { |
| scoreSums[ord] = current; |
| } else { |
| switch (scoreMode) { |
| case Total: |
| scoreSums[ord] = scoreSums[ord] + current; |
| break; |
| case Max: |
| if (current > existing) { |
| scoreSums[ord] = current; |
| } |
| } |
| } |
| } |
| |
| @Override |
| protected void doSetNextReader(AtomicReaderContext context) throws IOException { |
| fromDocTerms = DocValues.getBinary(context.reader(), field); |
| } |
| |
| static class Avg extends SV { |
| |
| int[] scoreCounts = new int[INITIAL_ARRAY_SIZE]; |
| |
| Avg(String field) { |
| super(field, ScoreMode.Avg); |
| } |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| fromDocTerms.get(doc, spare); |
| int ord = collectedTerms.add(spare); |
| if (ord < 0) { |
| ord = -ord - 1; |
| } else { |
| if (ord >= scoreSums.length) { |
| scoreSums = ArrayUtil.grow(scoreSums); |
| scoreCounts = ArrayUtil.grow(scoreCounts); |
| } |
| } |
| |
| float current = scorer.score(); |
| float existing = scoreSums[ord]; |
| if (Float.compare(existing, 0.0f) == 0) { |
| scoreSums[ord] = current; |
| scoreCounts[ord] = 1; |
| } else { |
| scoreSums[ord] = scoreSums[ord] + current; |
| scoreCounts[ord]++; |
| } |
| } |
| |
| @Override |
| public float[] getScoresPerTerm() { |
| if (scoreCounts != null) { |
| for (int i = 0; i < scoreCounts.length; i++) { |
| scoreSums[i] = scoreSums[i] / scoreCounts[i]; |
| } |
| scoreCounts = null; |
| } |
| return scoreSums; |
| } |
| } |
| } |
| |
| // impl that works with multiple values per document |
| static class MV extends TermsWithScoreCollector { |
| |
| SortedSetDocValues fromDocTermOrds; |
| final BytesRef scratch = new BytesRef(); |
| |
| MV(String field, ScoreMode scoreMode) { |
| super(field, scoreMode); |
| } |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| fromDocTermOrds.setDocument(doc); |
| long ord; |
| while ((ord = fromDocTermOrds.nextOrd()) != SortedSetDocValues.NO_MORE_ORDS) { |
| fromDocTermOrds.lookupOrd(ord, scratch); |
| |
| int termID = collectedTerms.add(scratch); |
| if (termID < 0) { |
| termID = -termID - 1; |
| } else { |
| if (termID >= scoreSums.length) { |
| scoreSums = ArrayUtil.grow(scoreSums); |
| } |
| } |
| |
| switch (scoreMode) { |
| case Total: |
| scoreSums[termID] += scorer.score(); |
| break; |
| case Max: |
| scoreSums[termID] = Math.max(scoreSums[termID], scorer.score()); |
| } |
| } |
| } |
| |
| @Override |
| protected void doSetNextReader(AtomicReaderContext context) throws IOException { |
| fromDocTermOrds = DocValues.getSortedSet(context.reader(), field); |
| } |
| |
| static class Avg extends MV { |
| |
| int[] scoreCounts = new int[INITIAL_ARRAY_SIZE]; |
| |
| Avg(String field) { |
| super(field, ScoreMode.Avg); |
| } |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| fromDocTermOrds.setDocument(doc); |
| long ord; |
| while ((ord = fromDocTermOrds.nextOrd()) != SortedSetDocValues.NO_MORE_ORDS) { |
| fromDocTermOrds.lookupOrd(ord, scratch); |
| |
| int termID = collectedTerms.add(scratch); |
| if (termID < 0) { |
| termID = -termID - 1; |
| } else { |
| if (termID >= scoreSums.length) { |
| scoreSums = ArrayUtil.grow(scoreSums); |
| scoreCounts = ArrayUtil.grow(scoreCounts); |
| } |
| } |
| |
| scoreSums[termID] += scorer.score(); |
| scoreCounts[termID]++; |
| } |
| } |
| |
| @Override |
| public float[] getScoresPerTerm() { |
| if (scoreCounts != null) { |
| for (int i = 0; i < scoreCounts.length; i++) { |
| scoreSums[i] = scoreSums[i] / scoreCounts[i]; |
| } |
| scoreCounts = null; |
| } |
| return scoreSums; |
| } |
| } |
| } |
| |
| } |