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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.percolator;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.action.percolate.PercolateShardRequest;
import org.elasticsearch.cluster.action.index.MappingUpdatedAction;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.mapper.DocumentMapperForType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.ParsedDocument;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.aggregations.AggregationPhase;
import org.elasticsearch.search.highlight.HighlightPhase;
import org.elasticsearch.search.sort.SortParseElement;
import java.util.Map;
import static org.elasticsearch.index.mapper.SourceToParse.source;
public class PercolateDocumentParser {
private final HighlightPhase highlightPhase;
private final SortParseElement sortParseElement;
private final AggregationPhase aggregationPhase;
@Inject
public PercolateDocumentParser(HighlightPhase highlightPhase, SortParseElement sortParseElement,
AggregationPhase aggregationPhase) {
this.highlightPhase = highlightPhase;
this.sortParseElement = sortParseElement;
this.aggregationPhase = aggregationPhase;
}
public ParsedDocument parse(PercolateShardRequest request, PercolateContext context, MapperService mapperService, QueryShardContext queryShardContext) {
BytesReference source = request.source();
if (source == null || source.length() == 0) {
if (request.docSource() != null && request.docSource().length() != 0) {
return parseFetchedDoc(context, request.docSource(), mapperService, request.shardId().getIndexName(), request.documentType());
} else {
return null;
}
}
// TODO: combine all feature parse elements into one map
Map<String, ? extends SearchParseElement> hlElements = highlightPhase.parseElements();
Map<String, ? extends SearchParseElement> aggregationElements = aggregationPhase.parseElements();
ParsedDocument doc = null;
// Some queries (function_score query when for decay functions) rely on a SearchContext being set:
// We switch types because this context needs to be in the context of the percolate queries in the shard and
// not the in memory percolate doc
String[] previousTypes = context.types();
context.types(new String[]{PercolatorService.TYPE_NAME});
try (XContentParser parser = XContentFactory.xContent(source).createParser(source);) {
String currentFieldName = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
// we need to check the "doc" here, so the next token will be START_OBJECT which is
// the actual document starting
if ("doc".equals(currentFieldName)) {
if (doc != null) {
throw new ElasticsearchParseException("Either specify doc or get, not both");
}
DocumentMapperForType docMapper = mapperService.documentMapperWithAutoCreate(request.documentType());
String index = context.shardTarget().index();
doc = docMapper.getDocumentMapper().parse(source(parser).index(index).type(request.documentType()).flyweight(true));
if (docMapper.getMapping() != null) {
doc.addDynamicMappingsUpdate(docMapper.getMapping());
}
// the document parsing exists the "doc" object, so we need to set the new current field.
currentFieldName = parser.currentName();
}
} else if (token == XContentParser.Token.START_OBJECT) {
SearchParseElement element = hlElements.get(currentFieldName);
if (element == null) {
element = aggregationElements.get(currentFieldName);
}
if ("query".equals(currentFieldName)) {
if (context.percolateQuery() != null) {
throw new ElasticsearchParseException("Either specify query or filter, not both");
}
context.percolateQuery(queryShardContext.parse(parser).query());
} else if ("filter".equals(currentFieldName)) {
if (context.percolateQuery() != null) {
throw new ElasticsearchParseException("Either specify query or filter, not both");
}
Query filter = queryShardContext.parseInnerFilter(parser).query();
context.percolateQuery(new ConstantScoreQuery(filter));
} else if ("sort".equals(currentFieldName)) {
parseSort(parser, context);
} else if (element != null) {
element.parse(parser, context);
}
} else if (token == XContentParser.Token.START_ARRAY) {
if ("sort".equals(currentFieldName)) {
parseSort(parser, context);
}
} else if (token == null) {
break;
} else if (token.isValue()) {
if ("size".equals(currentFieldName)) {
context.size(parser.intValue());
if (context.size() < 0) {
throw new ElasticsearchParseException("size is set to [{}] and is expected to be higher or equal to 0", context.size());
}
} else if ("sort".equals(currentFieldName)) {
parseSort(parser, context);
} else if ("track_scores".equals(currentFieldName) || "trackScores".equals(currentFieldName)) {
context.trackScores(parser.booleanValue());
}
}
}
// We need to get the actual source from the request body for highlighting, so parse the request body again
// and only get the doc source.
if (context.highlight() != null) {
parser.close();
currentFieldName = null;
try (XContentParser parserForHighlighter = XContentFactory.xContent(source).createParser(source)) {
token = parserForHighlighter.nextToken();
assert token == XContentParser.Token.START_OBJECT;
while ((token = parserForHighlighter.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parserForHighlighter.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if ("doc".equals(currentFieldName)) {
BytesStreamOutput bStream = new BytesStreamOutput();
XContentBuilder builder = XContentFactory.contentBuilder(XContentType.SMILE, bStream);
builder.copyCurrentStructure(parserForHighlighter);
builder.close();
doc.setSource(bStream.bytes());
break;
} else {
parserForHighlighter.skipChildren();
}
} else if (token == null) {
break;
}
}
}
}
} catch (Throwable e) {
throw new ElasticsearchParseException("failed to parse request", e);
} finally {
context.types(previousTypes);
}
if (request.docSource() != null && request.docSource().length() != 0) {
if (doc != null) {
throw new IllegalArgumentException("Can't specify the document to percolate in the source of the request and as document id");
}
doc = parseFetchedDoc(context, request.docSource(), mapperService, request.shardId().getIndexName(), request.documentType());
}
if (doc == null) {
throw new IllegalArgumentException("Nothing to percolate");
}
return doc;
}
private void parseSort(XContentParser parser, PercolateContext context) throws Exception {
context.trackScores(true);
sortParseElement.parse(parser, context);
// null, means default sorting by relevancy
if (context.sort() != null) {
throw new ElasticsearchParseException("Only _score desc is supported");
}
}
private ParsedDocument parseFetchedDoc(PercolateContext context, BytesReference fetchedDoc, MapperService mapperService, String index, String type) {
try (XContentParser parser = XContentFactory.xContent(fetchedDoc).createParser(fetchedDoc)) {
DocumentMapperForType docMapper = mapperService.documentMapperWithAutoCreate(type);
ParsedDocument doc = docMapper.getDocumentMapper().parse(source(parser).index(index).type(type).flyweight(true));
if (doc == null) {
throw new ElasticsearchParseException("No doc to percolate in the request");
}
if (context.highlight() != null) {
doc.setSource(fetchedDoc);
}
return doc;
} catch (Throwable e) {
throw new ElasticsearchParseException("failed to parse request", e);
}
}
}
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