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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.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.core.CompletionFieldMapper;
import org.elasticsearch.search.suggest.SuggestContextParser;
import org.elasticsearch.search.suggest.SuggestionSearchContext;
import org.elasticsearch.search.suggest.context.ContextMapping.ContextQuery;
import java.io.IOException;
import java.util.List;
import static org.elasticsearch.search.suggest.SuggestUtils.parseSuggestContext;
/**
*
*/
public class CompletionSuggestParser implements SuggestContextParser {
private CompletionSuggester completionSuggester;
private static final ParseField FUZZINESS = Fuzziness.FIELD.withDeprecation("edit_distance");
public CompletionSuggestParser(CompletionSuggester completionSuggester) {
this.completionSuggester = completionSuggester;
}
@Override
public SuggestionSearchContext.SuggestionContext parse(XContentParser parser, MapperService mapperService) throws IOException {
XContentParser.Token token;
String fieldName = null;
CompletionSuggestionContext suggestion = new CompletionSuggestionContext(completionSuggester);
XContentParser contextParser = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
fieldName = parser.currentName();
} else if (token.isValue()) {
if (!parseSuggestContext(parser, mapperService, fieldName, suggestion)) {
if (token == XContentParser.Token.VALUE_BOOLEAN && "fuzzy".equals(fieldName)) {
suggestion.setFuzzy(parser.booleanValue());
}
}
} else if (token == XContentParser.Token.START_OBJECT) {
if("fuzzy".equals(fieldName)) {
suggestion.setFuzzy(true);
String fuzzyConfigName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
fuzzyConfigName = parser.currentName();
} else if (token.isValue()) {
if (FUZZINESS.match(fuzzyConfigName, ParseField.EMPTY_FLAGS)) {
suggestion.setFuzzyEditDistance(Fuzziness.parse(parser).asDistance());
} else if ("transpositions".equals(fuzzyConfigName)) {
suggestion.setFuzzyTranspositions(parser.booleanValue());
} else if ("min_length".equals(fuzzyConfigName) || "minLength".equals(fuzzyConfigName)) {
suggestion.setFuzzyMinLength(parser.intValue());
} else if ("prefix_length".equals(fuzzyConfigName) || "prefixLength".equals(fuzzyConfigName)) {
suggestion.setFuzzyPrefixLength(parser.intValue());
} else if ("unicode_aware".equals(fuzzyConfigName) || "unicodeAware".equals(fuzzyConfigName)) {
suggestion.setFuzzyUnicodeAware(parser.booleanValue());
}
}
}
} else if("context".equals(fieldName)) {
// Copy the current structure. We will parse, once the mapping is provided
XContentBuilder builder = XContentFactory.contentBuilder(parser.contentType());
builder.copyCurrentStructure(parser);
BytesReference bytes = builder.bytes();
contextParser = parser.contentType().xContent().createParser(bytes);
} else {
throw new ElasticsearchIllegalArgumentException("suggester [completion] doesn't support field [" + fieldName + "]");
}
} else {
throw new ElasticsearchIllegalArgumentException("suggester[completion] doesn't support field [" + fieldName + "]");
}
}
suggestion.mapper((CompletionFieldMapper)mapperService.smartNameFieldMapper(suggestion.getField()));
CompletionFieldMapper mapper = suggestion.mapper();
if (mapper != null) {
if (mapper.requiresContext()) {
if (contextParser == null) {
throw new ElasticsearchIllegalArgumentException("suggester [completion] requires context to be setup");
} else {
contextParser.nextToken();
List<ContextQuery> contextQueries = ContextQuery.parseQueries(mapper.getContextMapping(), contextParser);
suggestion.setContextQuery(contextQueries);
}
} else if (contextParser != null) {
throw new ElasticsearchIllegalArgumentException("suggester [completion] doesn't expect any context");
}
}
return suggestion;
}
}