/*
* 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.fetch.source;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* <pre>
* "source" : true/false
* "source" : "field"
* "source" : [ "include", "include" ]
* "source" : {
* "include" : ["obj"]
* "exclude" : ["obj"]
* }
* </pre>
*/
public class FetchSourceParseElement implements SearchParseElement {
@Override
public void parse(XContentParser parser, SearchContext context) throws Exception {
context.fetchSourceContext(parse(parser));
}
public FetchSourceContext parse(XContentParser parser) throws IOException {
XContentParser.Token token;
List<String> includes = null, excludes = null;
String currentFieldName = null;
token = parser.currentToken(); // we get it on the value
if (parser.isBooleanValue()) {
return new FetchSourceContext(parser.booleanValue());
} else if (token == XContentParser.Token.VALUE_STRING) {
return new FetchSourceContext(new String[]{parser.text()});
} else if (token == XContentParser.Token.START_ARRAY) {
includes = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
includes.add(parser.text());
}
} else if (token == XContentParser.Token.START_OBJECT) {
List<String> currentList = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
if ("includes".equals(currentFieldName) || "include".equals(currentFieldName)) {
currentList = includes != null ? includes : (includes = new ArrayList<>(2));
} else if ("excludes".equals(currentFieldName) || "exclude".equals(currentFieldName)) {
currentList = excludes != null ? excludes : (excludes = new ArrayList<>(2));
} else {
throw new ElasticsearchParseException("Source definition may not contain " + parser.text());
}
} else if (token == XContentParser.Token.START_ARRAY) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
currentList.add(parser.text());
}
} else if (token.isValue()) {
currentList.add(parser.text());
} else {
throw new ElasticsearchParseException("unexpected token while parsing source settings");
}
}
} else {
throw new ElasticsearchParseException("source element value can be of type " + token.name());
}
return new FetchSourceContext(
includes == null ? Strings.EMPTY_ARRAY : includes.toArray(new String[includes.size()]),
excludes == null ? Strings.EMPTY_ARRAY : excludes.toArray(new String[excludes.size()]));
}
}