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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.lucene.search;
import org.apache.lucene.search.*;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.index.search.child.CustomQueryWrappingFilter;
import java.util.List;
import java.util.regex.Pattern;
/**
*
*/
public class Queries {
/**
* A match all docs filter. Note, requires no caching!.
*/
public final static Filter MATCH_ALL_FILTER = new MatchAllDocsFilter();
public final static Filter MATCH_NO_FILTER = new MatchNoDocsFilter();
public static Query newMatchAllQuery() {
// We don't use MatchAllDocsQuery, its slower than the one below ... (much slower)
// NEVER cache this XConstantScore Query it's not immutable and based on #3521
// some code might set a boost on this query.
return new XConstantScoreQuery(MATCH_ALL_FILTER);
}
/** Return a query that matches no document. */
public static Query newMatchNoDocsQuery() {
return new MatchNoDocsQuery();
}
public static boolean isNegativeQuery(Query q) {
if (!(q instanceof BooleanQuery)) {
return false;
}
List clauses = ((BooleanQuery) q).clauses();
if (clauses.isEmpty()) {
return false;
}
for (BooleanClause clause : clauses) {
if (!clause.isProhibited()) return false;
}
return true;
}
public static Query fixNegativeQueryIfNeeded(Query q) {
if (isNegativeQuery(q)) {
BooleanQuery newBq = (BooleanQuery) q.clone();
newBq.add(newMatchAllQuery(), BooleanClause.Occur.MUST);
return newBq;
}
return q;
}
public static boolean isConstantMatchAllQuery(Query query) {
if (query instanceof XConstantScoreQuery) {
XConstantScoreQuery scoreQuery = (XConstantScoreQuery) query;
if (scoreQuery.getFilter() instanceof MatchAllDocsFilter) {
return true;
}
}
return false;
}
public static void applyMinimumShouldMatch(BooleanQuery query, @Nullable String minimumShouldMatch) {
if (minimumShouldMatch == null) {
return;
}
int optionalClauses = 0;
for (BooleanClause c : query.clauses()) {
if (c.getOccur() == BooleanClause.Occur.SHOULD) {
optionalClauses++;
}
}
int msm = calculateMinShouldMatch(optionalClauses, minimumShouldMatch);
if (0 < msm) {
query.setMinimumNumberShouldMatch(msm);
}
}
private static Pattern spaceAroundLessThanPattern = Pattern.compile("(\\s+<\\s*)|(\\s*<\\s+)");
private static Pattern spacePattern = Pattern.compile(" ");
private static Pattern lessThanPattern = Pattern.compile("<");
public static int calculateMinShouldMatch(int optionalClauseCount, String spec) {
int result = optionalClauseCount;
spec = spec.trim();
if (-1 < spec.indexOf("<")) {
/* we have conditional spec(s) */
spec = spaceAroundLessThanPattern.matcher(spec).replaceAll("<");
for (String s : spacePattern.split(spec)) {
String[] parts = lessThanPattern.split(s, 0);
int upperBound = Integer.parseInt(parts[0]);
if (optionalClauseCount <= upperBound) {
return result;
} else {
result = calculateMinShouldMatch
(optionalClauseCount, parts[1]);
}
}
return result;
}
/* otherwise, simple expresion */
if (-1 < spec.indexOf('%')) {
/* percentage - assume the % was the last char. If not, let Integer.parseInt fail. */
spec = spec.substring(0, spec.length() - 1);
int percent = Integer.parseInt(spec);
float calc = (result * percent) * (1 / 100f);
result = calc < 0 ? result + (int) calc : (int) calc;
} else {
int calc = Integer.parseInt(spec);
result = calc < 0 ? result + calc : calc;
}
return (optionalClauseCount < result ?
optionalClauseCount : (result < 0 ? 0 : result));
}
/**
* Wraps a query in a filter.
*
* If a filter has an anti per segment execution / caching nature then @{@link CustomQueryWrappingFilter} is returned
* otherwise the standard {@link org.apache.lucene.search.QueryWrapperFilter} is returned.
*/
public static Filter wrap(Query query, QueryParseContext context) {
return FACTORY.wrap(query, context);
}
private static final QueryWrapperFilterFactory FACTORY = new QueryWrapperFilterFactory();
// NOTE: This is a separate class since we added QueryWrapperFilter as a forbidden API
// that way we can exclude only the inner class without excluding the entire Queries class
// and potentially miss a forbidden API usage!
private static final class QueryWrapperFilterFactory {
public Filter wrap(Query query, QueryParseContext context) {
if ((context != null && context.requireCustomQueryWrappingFilter()) || CustomQueryWrappingFilter.shouldUseCustomQueryWrappingFilter(query)) {
return new CustomQueryWrappingFilter(query);
} else {
return new QueryWrapperFilter(query);
}
}
}
}