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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.index.query.support;
import org.apache.lucene.search.MultiTermQuery;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParseFieldMatcher;
/**
*
*/
public final class QueryParsers {
private static final ParseField CONSTANT_SCORE = new ParseField("constant_score", "constant_score_auto", "constant_score_filter");
private static final ParseField SCORING_BOOLEAN = new ParseField("scoring_boolean");
private static final ParseField CONSTANT_SCORE_BOOLEAN = new ParseField("constant_score_boolean");
private static final ParseField TOP_TERMS = new ParseField("top_terms_");
private static final ParseField TOP_TERMS_BOOST = new ParseField("top_terms_boost_");
private static final ParseField TOP_TERMS_BLENDED_FREQS = new ParseField("top_terms_blended_freqs_");
private QueryParsers() {
}
public static void setRewriteMethod(MultiTermQuery query, @Nullable MultiTermQuery.RewriteMethod rewriteMethod) {
if (rewriteMethod == null) {
return;
}
query.setRewriteMethod(rewriteMethod);
}
public static void setRewriteMethod(MultiTermQuery query, ParseFieldMatcher matcher, @Nullable String rewriteMethod) {
if (rewriteMethod == null) {
return;
}
query.setRewriteMethod(parseRewriteMethod(matcher, rewriteMethod));
}
public static MultiTermQuery.RewriteMethod parseRewriteMethod(ParseFieldMatcher matcher, @Nullable String rewriteMethod) {
return parseRewriteMethod(matcher, rewriteMethod, MultiTermQuery.CONSTANT_SCORE_REWRITE);
}
public static MultiTermQuery.RewriteMethod parseRewriteMethod(ParseFieldMatcher matcher, @Nullable String rewriteMethod, @Nullable MultiTermQuery.RewriteMethod defaultRewriteMethod) {
if (rewriteMethod == null) {
return defaultRewriteMethod;
}
if (matcher.match(rewriteMethod, CONSTANT_SCORE)) {
return MultiTermQuery.CONSTANT_SCORE_REWRITE;
}
if (matcher.match(rewriteMethod, SCORING_BOOLEAN)) {
return MultiTermQuery.SCORING_BOOLEAN_REWRITE;
}
if (matcher.match(rewriteMethod, CONSTANT_SCORE_BOOLEAN)) {
return MultiTermQuery.CONSTANT_SCORE_BOOLEAN_REWRITE;
}
int firstDigit = -1;
for (int i = 0; i < rewriteMethod.length(); ++i) {
if (Character.isDigit(rewriteMethod.charAt(i))) {
firstDigit = i;
break;
}
}
if (firstDigit >= 0) {
final int size = Integer.parseInt(rewriteMethod.substring(firstDigit));
String rewriteMethodName = rewriteMethod.substring(0, firstDigit);
if (matcher.match(rewriteMethodName, TOP_TERMS)) {
return new MultiTermQuery.TopTermsScoringBooleanQueryRewrite(size);
}
if (matcher.match(rewriteMethodName, TOP_TERMS_BOOST)) {
return new MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite(size);
}
if (matcher.match(rewriteMethodName, TOP_TERMS_BLENDED_FREQS)) {
return new MultiTermQuery.TopTermsBlendedFreqScoringRewrite(size);
}
}
throw new IllegalArgumentException("Failed to parse rewrite_method [" + rewriteMethod + "]");
}
}