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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;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.HasContextAndHeaders;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.fielddata.IndexFieldDataService;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.suggest.SuggestionSearchContext.SuggestionContext;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
*
*/
public final class SuggestParseElement implements SearchParseElement {
private Suggesters suggesters;
@Inject
public SuggestParseElement(Suggesters suggesters) {
this.suggesters = suggesters;
}
@Override
public void parse(XContentParser parser, SearchContext context) throws Exception {
SuggestionSearchContext suggestionSearchContext = parseInternal(parser, context.mapperService(), context.fieldData(),
context.shardTarget().index(), context.shardTarget().shardId(), context);
context.suggest(suggestionSearchContext);
}
public SuggestionSearchContext parseInternal(XContentParser parser, MapperService mapperService, IndexFieldDataService fieldDataService,
String index, int shardId, HasContextAndHeaders headersContext) throws IOException {
SuggestionSearchContext suggestionSearchContext = new SuggestionSearchContext();
BytesRef globalText = null;
String fieldName = null;
Map<String, SuggestionContext> suggestionContexts = new HashMap<>();
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
fieldName = parser.currentName();
} else if (token.isValue()) {
if ("text".equals(fieldName)) {
globalText = parser.utf8Bytes();
} else {
throw new IllegalArgumentException("[suggest] does not support [" + fieldName + "]");
}
} else if (token == XContentParser.Token.START_OBJECT) {
String suggestionName = fieldName;
BytesRef suggestText = null;
BytesRef prefix = null;
BytesRef regex = null;
SuggestionContext suggestionContext = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
fieldName = parser.currentName();
} else if (token.isValue()) {
if ("text".equals(fieldName)) {
suggestText = parser.utf8Bytes();
} else if ("prefix".equals(fieldName)) {
prefix = parser.utf8Bytes();
} else if ("regex".equals(fieldName)) {
regex = parser.utf8Bytes();
} else {
throw new IllegalArgumentException("[suggest] does not support [" + fieldName + "]");
}
} else if (token == XContentParser.Token.START_OBJECT) {
if (suggestionName == null) {
throw new IllegalArgumentException("Suggestion must have name");
}
if (suggesters.get(fieldName) == null) {
throw new IllegalArgumentException("Suggester[" + fieldName + "] not supported");
}
final SuggestContextParser contextParser = suggesters.get(fieldName).getContextParser();
suggestionContext = contextParser.parse(parser, mapperService, fieldDataService, headersContext);
}
}
if (suggestionContext != null) {
if (suggestText != null && prefix == null) {
suggestionContext.setPrefix(suggestText);
suggestionContext.setText(suggestText);
} else if (suggestText == null && prefix != null) {
suggestionContext.setPrefix(prefix);
suggestionContext.setText(prefix);
} else if (regex != null) {
suggestionContext.setRegex(regex);
suggestionContext.setText(regex);
}
suggestionContexts.put(suggestionName, suggestionContext);
}
}
}
for (Map.Entry<String, SuggestionContext> entry : suggestionContexts.entrySet()) {
String suggestionName = entry.getKey();
SuggestionContext suggestionContext = entry.getValue();
suggestionContext.setShard(shardId);
suggestionContext.setIndex(index);
SuggestUtils.verifySuggestion(mapperService, globalText, suggestionContext);
suggestionSearchContext.addSuggestion(suggestionName, suggestionContext);
}
return suggestionSearchContext;
}
}
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