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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.search.suggest.completion;
import org.apache.lucene.analysis.Analyzer;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.core.CompletionFieldMapper;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.index.query.RegexpFlag;
import org.elasticsearch.search.suggest.SuggestContextParser;
import org.elasticsearch.search.suggest.SuggestUtils.Fields;
import org.elasticsearch.search.suggest.SuggestionSearchContext;
import java.io.IOException;
/**
* Parses query options for {@link CompletionSuggester}
*
* Acceptable input:
* {
* "field" : STRING
* "size" : INT
* "fuzzy" : BOOLEAN | FUZZY_OBJECT
* "contexts" : QUERY_CONTEXTS
* "regex" : REGEX_OBJECT
* }
*
* FUZZY_OBJECT : {
* "edit_distance" : STRING | INT
* "transpositions" : BOOLEAN
* "min_length" : INT
* "prefix_length" : INT
* "unicode_aware" : BOOLEAN
* "max_determinized_states" : INT
* }
*
* REGEX_OBJECT: {
* "flags" : REGEX_FLAGS
* "max_determinized_states" : INT
* }
*
* see {@link RegexpFlag} for REGEX_FLAGS
*/
public class CompletionSuggestParser implements SuggestContextParser {
private static ObjectParser<CompletionSuggestionContext, ContextAndSuggest> TLP_PARSER = new ObjectParser<>(CompletionSuggestionBuilder.SUGGESTION_NAME, null);
static {
TLP_PARSER.declareStringArray(CompletionSuggestionContext::setPayloadFields, CompletionSuggestionBuilder.PAYLOAD_FIELD);
TLP_PARSER.declareField((parser, completionSuggestionContext, context) -> {
if (parser.currentToken() == XContentParser.Token.VALUE_BOOLEAN) {
if (parser.booleanValue()) {
completionSuggestionContext.setFuzzyOptions(new FuzzyOptions.Builder().build());
}
} else {
completionSuggestionContext.setFuzzyOptions(FuzzyOptions.parse(parser));
}
},
FuzzyOptions.FUZZY_OPTIONS, ObjectParser.ValueType.OBJECT_OR_BOOLEAN);
TLP_PARSER.declareField((parser, completionSuggestionContext, context) -> completionSuggestionContext.setRegexOptions(RegexOptions.parse(parser)),
RegexOptions.REGEX_OPTIONS, ObjectParser.ValueType.OBJECT);
TLP_PARSER.declareString(SuggestionSearchContext.SuggestionContext::setField, Fields.FIELD);
TLP_PARSER.declareField((p, v, c) -> {
String analyzerName = p.text();
Analyzer analyzer = c.mapperService.analysisService().analyzer(analyzerName);
if (analyzer == null) {
throw new IllegalArgumentException("Analyzer [" + analyzerName + "] doesn't exists");
}
v.setAnalyzer(analyzer);
}, Fields.ANALYZER, ObjectParser.ValueType.STRING);
TLP_PARSER.declareInt(SuggestionSearchContext.SuggestionContext::setSize, Fields.SIZE);
TLP_PARSER.declareInt(SuggestionSearchContext.SuggestionContext::setShardSize, Fields.SHARD_SIZE);
TLP_PARSER.declareField((p, v, c) -> {
// Copy the current structure. We will parse, once the mapping is provided
XContentBuilder builder = XContentFactory.contentBuilder(p.contentType());
builder.copyCurrentStructure(p);
BytesReference bytes = builder.bytes();
c.contextParser = XContentFactory.xContent(bytes).createParser(bytes);
p.skipChildren();
}, CompletionSuggestionBuilder.CONTEXTS_FIELD, ObjectParser.ValueType.OBJECT); // context is deprecated
}
private static class ContextAndSuggest {
XContentParser contextParser;
final MapperService mapperService;
ContextAndSuggest(MapperService mapperService) {
this.mapperService = mapperService;
}
}
private final CompletionSuggester completionSuggester;
public CompletionSuggestParser(CompletionSuggester completionSuggester) {
this.completionSuggester = completionSuggester;
}
@Override
public SuggestionSearchContext.SuggestionContext parse(XContentParser parser, QueryShardContext shardContext) throws IOException {
MapperService mapperService = shardContext.getMapperService();
final CompletionSuggestionContext suggestion = new CompletionSuggestionContext(shardContext);
final ContextAndSuggest contextAndSuggest = new ContextAndSuggest(mapperService);
TLP_PARSER.parse(parser, suggestion, contextAndSuggest);
final XContentParser contextParser = contextAndSuggest.contextParser;
MappedFieldType mappedFieldType = mapperService.fullName(suggestion.getField());
if (mappedFieldType == null) {
throw new ElasticsearchException("Field [" + suggestion.getField() + "] is not a completion suggest field");
} else if (mappedFieldType instanceof CompletionFieldMapper.CompletionFieldType) {
CompletionFieldMapper.CompletionFieldType type = (CompletionFieldMapper.CompletionFieldType) mappedFieldType;
if (type.hasContextMappings() == false && contextParser != null) {
throw new IllegalArgumentException("suggester [" + type.name() + "] doesn't expect any context");
}
suggestion.setQueryContexts(CompletionSuggestionBuilder.parseQueryContexts(contextParser, type));
suggestion.setFieldType(type);
return suggestion;
} else {
throw new IllegalArgumentException("Field [" + suggestion.getField() + "] is not a completion suggest field");
}
}
}
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