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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.ParseField;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.unit.Fuzziness;
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.fielddata.IndexFieldDataService;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.core.CompletionFieldMapper;
import org.elasticsearch.index.query.RegexpFlag;
import org.elasticsearch.search.suggest.SuggestContextParser;
import org.elasticsearch.search.suggest.SuggestionSearchContext;
import org.elasticsearch.search.suggest.completion.context.ContextMapping;
import org.elasticsearch.search.suggest.completion.context.ContextMappings;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* 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<>("completion", null);
private static ObjectParser<CompletionSuggestionBuilder.RegexOptionsBuilder, ContextAndSuggest> REGEXP_PARSER = new ObjectParser<>("regexp", CompletionSuggestionBuilder.RegexOptionsBuilder::new);
private static ObjectParser<CompletionSuggestionBuilder.FuzzyOptionsBuilder, ContextAndSuggest> FUZZY_PARSER = new ObjectParser<>("fuzzy", CompletionSuggestionBuilder.FuzzyOptionsBuilder::new);
static {
FUZZY_PARSER.declareInt(CompletionSuggestionBuilder.FuzzyOptionsBuilder::setFuzzyMinLength, new ParseField("min_length"));
FUZZY_PARSER.declareInt(CompletionSuggestionBuilder.FuzzyOptionsBuilder::setMaxDeterminizedStates, new ParseField("max_determinized_states"));
FUZZY_PARSER.declareBoolean(CompletionSuggestionBuilder.FuzzyOptionsBuilder::setUnicodeAware, new ParseField("unicode_aware"));
FUZZY_PARSER.declareInt(CompletionSuggestionBuilder.FuzzyOptionsBuilder::setFuzzyPrefixLength, new ParseField("prefix_length"));
FUZZY_PARSER.declareBoolean(CompletionSuggestionBuilder.FuzzyOptionsBuilder::setTranspositions, new ParseField("transpositions"));
FUZZY_PARSER.declareValue((a, b) -> {
try {
a.setFuzziness(Fuzziness.parse(b).asDistance());
} catch (IOException e) {
throw new ElasticsearchException(e);
}
}, new ParseField("fuzziness"));
REGEXP_PARSER.declareInt(CompletionSuggestionBuilder.RegexOptionsBuilder::setMaxDeterminizedStates, new ParseField("max_determinized_states"));
REGEXP_PARSER.declareStringOrNull(CompletionSuggestionBuilder.RegexOptionsBuilder::setFlags, new ParseField("flags"));
TLP_PARSER.declareStringArray(CompletionSuggestionContext::setPayloadFields, new ParseField("payload"));
TLP_PARSER.declareObjectOrDefault(CompletionSuggestionContext::setFuzzyOptionsBuilder, FUZZY_PARSER, CompletionSuggestionBuilder.FuzzyOptionsBuilder::new, new ParseField("fuzzy"));
TLP_PARSER.declareObject(CompletionSuggestionContext::setRegexOptionsBuilder, REGEXP_PARSER, new ParseField("regexp"));
TLP_PARSER.declareString(SuggestionSearchContext.SuggestionContext::setField, new ParseField("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);
}, new ParseField("analyzer"), ObjectParser.ValueType.STRING);
TLP_PARSER.declareString(SuggestionSearchContext.SuggestionContext::setField, new ParseField("analyzer"));
TLP_PARSER.declareInt(SuggestionSearchContext.SuggestionContext::setSize, new ParseField("size"));
TLP_PARSER.declareInt(SuggestionSearchContext.SuggestionContext::setShardSize, new ParseField("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();
}, new ParseField("contexts", "context"), 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, MapperService mapperService, IndexFieldDataService fieldDataService) throws IOException {
final CompletionSuggestionContext suggestion = new CompletionSuggestionContext(completionSuggester, mapperService, fieldDataService);
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");
}
Map<String, List<ContextMapping.QueryContext>> queryContexts = Collections.emptyMap();
if (type.hasContextMappings() && contextParser != null) {
ContextMappings contextMappings = type.getContextMappings();
contextParser.nextToken();
queryContexts = new HashMap<>(contextMappings.size());
assert contextParser.currentToken() == XContentParser.Token.START_OBJECT;
XContentParser.Token currentToken;
String currentFieldName;
while ((currentToken = contextParser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (currentToken == XContentParser.Token.FIELD_NAME) {
currentFieldName = contextParser.currentName();
final ContextMapping mapping = contextMappings.get(currentFieldName);
queryContexts.put(currentFieldName, mapping.parseQueryContext(contextParser));
}
}
contextParser.close();
}
suggestion.setFieldType(type);
suggestion.setQueryContexts(queryContexts);
return suggestion;
} else {
throw new IllegalArgumentException("Field [" + suggestion.getField() + "] is not a completion suggest field");
}
}
}
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