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SOLR-16420: {!mlt_content} (apache#1045)
* SOLR-16420: introducing {!mlt_content} accepting external content.- Loading branch information
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solr/core/src/java/org/apache/solr/search/mlt/AbstractMLTQParser.java
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| /* | ||
| * 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.solr.search.mlt; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.function.Supplier; | ||
| import java.util.regex.Pattern; | ||
| import org.apache.lucene.queries.mlt.MoreLikeThis; | ||
| import org.apache.lucene.search.BooleanClause; | ||
| import org.apache.lucene.search.BooleanQuery; | ||
| import org.apache.lucene.search.BoostQuery; | ||
| import org.apache.lucene.search.Query; | ||
| import org.apache.lucene.search.TermQuery; | ||
| import org.apache.solr.common.SolrException; | ||
| import org.apache.solr.common.StringUtils; | ||
| import org.apache.solr.common.params.SolrParams; | ||
| import org.apache.solr.request.SolrQueryRequest; | ||
| import org.apache.solr.schema.SchemaField; | ||
| import org.apache.solr.search.QParser; | ||
| import org.apache.solr.search.QueryUtils; | ||
| import org.apache.solr.util.SolrPluginUtils; | ||
|
|
||
| abstract class AbstractMLTQParser extends QParser { | ||
| // Pattern is thread safe -- TODO? share this with general 'fl' param | ||
| private static final Pattern splitList = Pattern.compile(",| "); | ||
|
|
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| /** Retrieves text and string fields fom the schema */ | ||
| protected String[] getFieldsFromSchema() { | ||
| Map<String, SchemaField> fieldDefinitions = req.getSearcher().getSchema().getFields(); | ||
| ArrayList<String> fields = new ArrayList<>(); | ||
| for (Map.Entry<String, SchemaField> entry : fieldDefinitions.entrySet()) { | ||
| if (entry.getValue().indexed() && entry.getValue().stored()) | ||
| if (entry.getValue().getType().getNumberType() == null) fields.add(entry.getKey()); | ||
| } | ||
| return fields.toArray(new String[0]); | ||
| } | ||
|
|
||
| /** | ||
| * Constructor for the QParser | ||
| * | ||
| * @param qstr The part of the query string specific to this parser | ||
| * @param localParams The set of parameters that are specific to this QParser. See | ||
| * https://solr.apache.org/guide/solr/latest/query-guide/local-params.html | ||
| * @param params The rest of the {@link SolrParams} | ||
| * @param req The original {@link SolrQueryRequest}. | ||
| */ | ||
| AbstractMLTQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { | ||
| super(qstr, localParams, params, req); | ||
| } | ||
|
|
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| /** exclude current document from results */ | ||
| public BooleanQuery exclude(BooleanQuery boostedMLTQuery, Query docIdQuery) { | ||
| BooleanQuery.Builder realMLTQuery = new BooleanQuery.Builder(); | ||
| realMLTQuery.add(boostedMLTQuery, BooleanClause.Occur.MUST); | ||
| realMLTQuery.add(docIdQuery, BooleanClause.Occur.MUST_NOT); | ||
| return realMLTQuery.build(); | ||
| } | ||
|
|
||
| @FunctionalInterface | ||
| protected interface MLTInvoker { | ||
| Query invoke(MoreLikeThis mlt) throws IOException; | ||
| } | ||
|
|
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| protected BooleanQuery parseMLTQuery( | ||
| Supplier<String[]> fieldsFallback, MLTInvoker invoker, Query docIdQuery) throws IOException { | ||
| return exclude(parseMLTQuery(fieldsFallback, invoker), docIdQuery); | ||
| } | ||
|
|
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| protected BooleanQuery parseMLTQuery(Supplier<String[]> fieldsFallback, MLTInvoker invoker) | ||
| throws IOException { | ||
| Map<String, Float> boostFields = new HashMap<>(); | ||
| MoreLikeThis mlt = new MoreLikeThis(req.getSearcher().getIndexReader()); | ||
|
|
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| mlt.setMinTermFreq(localParams.getInt("mintf", MoreLikeThis.DEFAULT_MIN_TERM_FREQ)); | ||
| // TODO def mindf was 0 for cloud, 5 for standalone | ||
| mlt.setMinDocFreq(localParams.getInt("mindf", MoreLikeThis.DEFAULT_MIN_DOC_FREQ)); | ||
| mlt.setMinWordLen(localParams.getInt("minwl", MoreLikeThis.DEFAULT_MIN_WORD_LENGTH)); | ||
| mlt.setMaxWordLen(localParams.getInt("maxwl", MoreLikeThis.DEFAULT_MAX_WORD_LENGTH)); | ||
| mlt.setMaxQueryTerms(localParams.getInt("maxqt", MoreLikeThis.DEFAULT_MAX_QUERY_TERMS)); | ||
| mlt.setMaxNumTokensParsed( | ||
| localParams.getInt("maxntp", MoreLikeThis.DEFAULT_MAX_NUM_TOKENS_PARSED)); | ||
| mlt.setMaxDocFreq(localParams.getInt("maxdf", MoreLikeThis.DEFAULT_MAX_DOC_FREQ)); | ||
|
|
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| final boolean boost = localParams.getBool("boost", MoreLikeThis.DEFAULT_BOOST); | ||
| mlt.setBoost(boost); | ||
|
|
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| mlt.setAnalyzer(req.getSchema().getIndexAnalyzer()); | ||
|
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| final String[] fieldNames; | ||
| String[] qf = localParams.getParams("qf"); | ||
| if (qf != null) { | ||
| ArrayList<String> fields = new ArrayList<>(); | ||
| for (String fieldName : qf) { | ||
| if (!StringUtils.isEmpty(fieldName)) { | ||
| String[] strings = splitList.split(fieldName); | ||
| for (String string : strings) { | ||
| if (!StringUtils.isEmpty(string)) { | ||
| fields.add(string); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| // Parse field names and boosts from the fields | ||
| boostFields.putAll(SolrPluginUtils.parseFieldBoosts(fields.toArray(new String[0]))); | ||
| fieldNames = boostFields.keySet().toArray(new String[0]); | ||
| } else { | ||
| fieldNames = fieldsFallback.get(); | ||
| } | ||
| if (fieldNames.length < 1) { | ||
| throw new SolrException( | ||
| SolrException.ErrorCode.BAD_REQUEST, | ||
| "MoreLikeThis requires at least one similarity field: qf"); | ||
| } | ||
| mlt.setFieldNames(fieldNames); | ||
| final BooleanQuery rawMLTQuery = (BooleanQuery) invoker.invoke(mlt); | ||
|
|
||
| if (boost && boostFields.size() > 0) { | ||
| BooleanQuery.Builder newQ = new BooleanQuery.Builder(); | ||
| newQ.setMinimumNumberShouldMatch(rawMLTQuery.getMinimumNumberShouldMatch()); | ||
|
|
||
| for (BooleanClause clause : rawMLTQuery) { | ||
| Query q = clause.getQuery(); | ||
| float originalBoost = 1f; | ||
| if (q instanceof BoostQuery) { | ||
| BoostQuery bq = (BoostQuery) q; | ||
| q = bq.getQuery(); | ||
| originalBoost = bq.getBoost(); | ||
| } | ||
| Float fieldBoost = boostFields.get(((TermQuery) q).getTerm().field()); | ||
| q = | ||
| ((fieldBoost != null) | ||
| ? new BoostQuery(q, fieldBoost * originalBoost) | ||
| : clause.getQuery()); | ||
| newQ.add(q, clause.getOccur()); | ||
| } | ||
| return QueryUtils.build(newQ, this); | ||
| } | ||
| return rawMLTQuery; | ||
| } | ||
| } |
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