com.stratio.cassandra.lucene.search.condition.LuceneCondition Maven / Gradle / Ivy
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* Licensed to STRATIO (C) under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional information
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* 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
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package com.stratio.cassandra.lucene.search.condition;
import com.google.common.base.Objects;
import com.stratio.cassandra.lucene.IndexException;
import com.stratio.cassandra.lucene.schema.Schema;
import org.apache.commons.lang3.StringUtils;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.Query;
/**
* A {@link Condition} implementation that matches documents satisfying a Lucene Query Syntax.
*
* @author Andres de la Pena {@literal }
*/
public class LuceneCondition extends Condition {
/** The default name of the field where the clauses will be applied by default. */
public static final String DEFAULT_FIELD = "lucene";
/** The Lucene query syntax expression. */
public final String query;
/** The name of the field where the clauses will be applied by default. */
public final String defaultField;
/**
* Constructor using the field name and the value to be matched.
*
* @param boost The boost for this query clause. Documents matching this clause will (in addition to the
* normal weightings) have their score multiplied by {@code boost}. If {@code null}, then {@link
* #DEFAULT_BOOST} is used as default.
* @param defaultField the default field name.
* @param query the Lucene Query Syntax query.
*/
public LuceneCondition(Float boost, String defaultField, String query) {
super(boost);
if (StringUtils.isBlank(query)) {
throw new IndexException("Query statement required");
}
this.query = query;
this.defaultField = defaultField == null ? DEFAULT_FIELD : defaultField;
}
/** {@inheritDoc} */
@Override
public Query query(Schema schema) {
try {
Analyzer analyzer = schema.getAnalyzer();
QueryParser queryParser = new QueryParser(defaultField, analyzer);
queryParser.setAllowLeadingWildcard(true);
queryParser.setLowercaseExpandedTerms(false);
Query luceneQuery = queryParser.parse(query);
luceneQuery.setBoost(boost);
return luceneQuery;
} catch (ParseException e) {
throw new IndexException("Error while parsing lucene syntax query: %s", e.getMessage());
}
}
/** {@inheritDoc} */
@Override
public String toString() {
return Objects.toStringHelper(this).add("query", query).add("defaultField", defaultField).toString();
}
}