anshumg commented on code in PR #3281: URL: https://github.com/apache/solr/pull/3281#discussion_r2012764800
########## solr/core/src/java/org/apache/solr/search/FuzzyQParserPlugin.java: ########## @@ -0,0 +1,102 @@ +/* + * 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; + +import org.apache.lucene.index.Term; +import org.apache.lucene.queryparser.surround.parser.QueryParser; +import org.apache.lucene.search.FuzzyQuery; +import org.apache.lucene.search.Query; +import org.apache.lucene.util.BytesRef; +import org.apache.solr.common.params.SolrParams; +import org.apache.solr.request.SolrQueryRequest; +import org.apache.solr.schema.FieldType; +import org.apache.solr.schema.SchemaField; +import org.apache.solr.schema.TextField; + +/** + * Plugin for parsing and creating Lucene {@link FuzzyQuery}s with all customizations available. All + * custom options, <code>maxEdits</code>, <code>prefixLength</code>, <code>maxExpansions</code>, and + * <code>transpositions</code> are optional and use the {@link FuzzyQuery} defaults if not provided. + * + * <p>Example: <code>{!fuzzy f=myfield maxEdits=1 prefixLength=3 maxExpansions=2}foobar</code> + * + * @see QueryParser + * @since 4.0 + */ +public class FuzzyQParserPlugin extends QParserPlugin { + public static final String NAME = "fuzzy"; + + @Override + public QParser createParser( + String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { + return new FuzzyQParser(qstr, localParams, params, req); + } + + static class FuzzyQParser extends QParser { + static final String MAX_EDITS_PARAM = "maxEdits"; + static final String PREFIX_LENGTH_PARAM = "prefixLength"; + static final String MAX_EXPANSIONS_PARAM = "maxExpansions"; + static final String TRANSPOSITIONS_PARAM = "transpositions"; + + public FuzzyQParser( + String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { + super(qstr, localParams, params, req); + } + + @Override + public Query parse() throws SyntaxError { + String termStr = getParam(QueryParsing.V); + String field = getParam(QueryParsing.F); + termStr = analyzeIfMultitermTermText(field, termStr); + Term t = new Term(field, termStr); + + String maxEditsRaw = getParam(MAX_EDITS_PARAM); + int maxEdits = + (maxEditsRaw != null) ? Integer.parseInt(maxEditsRaw) : FuzzyQuery.defaultMaxEdits; + String prefixLengthRaw = getParam(PREFIX_LENGTH_PARAM); + int prefixLength = + (prefixLengthRaw != null) + ? Integer.parseInt(prefixLengthRaw) + : FuzzyQuery.defaultPrefixLength; + String maxExpansionsRaw = getParam(MAX_EXPANSIONS_PARAM); + int maxExpansions = + (maxExpansionsRaw != null) + ? Integer.parseInt(maxExpansionsRaw) + : FuzzyQuery.defaultMaxExpansions; + String transpositionsRaw = getParam(TRANSPOSITIONS_PARAM); + boolean transpositions = + (transpositionsRaw != null) + ? Boolean.parseBoolean(transpositionsRaw) + : FuzzyQuery.defaultTranspositions; + + return new FuzzyQuery(t, maxEdits, prefixLength, maxExpansions, transpositions); + } + + protected String analyzeIfMultitermTermText(String field, String part) { + FieldType fieldType = req.getSchema().getFieldTypeNoEx(field); + if (part == null + || !(fieldType instanceof TextField) + || ((TextField) fieldType).getMultiTermAnalyzer() == null) return part; + + SchemaField sf = req.getSchema().getFieldOrNull((field)); + if (sf == null || !(fieldType instanceof TextField)) return part; Review Comment: `!(fieldType instanceof TextField)` will always be false, right? The conditional check in the line above will return if this condition is true. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For additional commands, e-mail: issues-h...@solr.apache.org
