org.elasticsearch.index.query.FilteredQueryParser Maven / Gradle / Ivy
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* 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;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.FilteredQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.lucene.search.XConstantScoreQuery;
import org.elasticsearch.common.lucene.search.XFilteredQuery;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import java.io.IOException;
/**
*
*/
public class FilteredQueryParser implements QueryParser {
public static final String NAME = "filtered";
@Inject
public FilteredQueryParser() {
}
@Override
public String[] names() {
return new String[]{NAME};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
Query query = Queries.newMatchAllQuery();
Filter filter = null;
boolean filterFound = false;
float boost = 1.0f;
boolean cache = false;
CacheKeyFilter.Key cacheKey = null;
String queryName = null;
String currentFieldName = null;
XContentParser.Token token;
FilteredQuery.FilterStrategy filterStrategy = XFilteredQuery.CUSTOM_FILTER_STRATEGY;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if ("query".equals(currentFieldName)) {
query = parseContext.parseInnerQuery();
} else if ("filter".equals(currentFieldName)) {
filterFound = true;
filter = parseContext.parseInnerFilter();
} else {
throw new QueryParsingException(parseContext.index(), "[filtered] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("strategy".equals(currentFieldName)) {
String value = parser.text();
if ("query_first".equals(value) || "queryFirst".equals(value)) {
filterStrategy = FilteredQuery.QUERY_FIRST_FILTER_STRATEGY;
} else if ("random_access_always".equals(value) || "randomAccessAlways".equals(value)) {
filterStrategy = XFilteredQuery.ALWAYS_RANDOM_ACCESS_FILTER_STRATEGY;
} else if ("leap_frog".equals(value) || "leapFrog".equals(value)) {
filterStrategy = FilteredQuery.LEAP_FROG_QUERY_FIRST_STRATEGY;
} else if (value.startsWith("random_access_")) {
int threshold = Integer.parseInt(value.substring("random_access_".length()));
filterStrategy = new XFilteredQuery.CustomRandomAccessFilterStrategy(threshold);
} else if (value.startsWith("randomAccess")) {
int threshold = Integer.parseInt(value.substring("randomAccess".length()));
filterStrategy = new XFilteredQuery.CustomRandomAccessFilterStrategy(threshold);
} else if ("leap_frog_query_first".equals(value) || "leapFrogQueryFirst".equals(value)) {
filterStrategy = FilteredQuery.LEAP_FROG_QUERY_FIRST_STRATEGY;
} else if ("leap_frog_filter_first".equals(value) || "leapFrogFilterFirst".equals(value)) {
filterStrategy = FilteredQuery.LEAP_FROG_FILTER_FIRST_STRATEGY;
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new QueryParsingException(parseContext.index(), "[filtered] strategy value not supported [" + value + "]");
}
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("_cache".equals(currentFieldName)) {
cache = parser.booleanValue();
} else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
cacheKey = new CacheKeyFilter.Key(parser.text());
} else {
throw new QueryParsingException(parseContext.index(), "[filtered] query does not support [" + currentFieldName + "]");
}
}
}
// parsed internally, but returned null during parsing...
if (query == null) {
return null;
}
if (filter == null) {
if (!filterFound) {
// we allow for null filter, so it makes compositions on the client side to be simpler
return query;
} else {
// even if the filter is not found, and its null, we should simply ignore it, and go
// by the query
return query;
}
}
if (filter == Queries.MATCH_ALL_FILTER) {
// this is an instance of match all filter, just execute the query
return query;
}
// cache if required
if (cache) {
filter = parseContext.cacheFilter(filter, cacheKey);
}
// if its a match_all query, use constant_score
if (Queries.isConstantMatchAllQuery(query)) {
Query q = new XConstantScoreQuery(filter);
q.setBoost(boost);
return q;
}
XFilteredQuery filteredQuery = new XFilteredQuery(query, filter, filterStrategy);
filteredQuery.setBoost(boost);
if (queryName != null) {
parseContext.addNamedQuery(queryName, filteredQuery);
}
return filteredQuery;
}
}