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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.aggregations.pipeline.cumulativesum;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class CumulativeSumParser implements PipelineAggregator.Parser {
public static final ParseField FORMAT = new ParseField("format");
public static final ParseField GAP_POLICY = new ParseField("gap_policy");
public static final ParseField UNIT = new ParseField("unit");
@Override
public String type() {
return CumulativeSumPipelineAggregator.TYPE.name();
}
@Override
public CumulativeSumPipelineAggregatorBuilder parse(String pipelineAggregatorName, QueryParseContext context) throws IOException {
XContentParser parser = context.parser();
XContentParser.Token token;
String currentFieldName = null;
String[] bucketsPaths = null;
String format = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.VALUE_STRING) {
if (context.parseFieldMatcher().match(currentFieldName, FORMAT)) {
format = parser.text();
} else if (context.parseFieldMatcher().match(currentFieldName, BUCKETS_PATH)) {
bucketsPaths = new String[] { parser.text() };
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + pipelineAggregatorName + "]: [" + currentFieldName + "].");
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (context.parseFieldMatcher().match(currentFieldName, BUCKETS_PATH)) {
List<String> paths = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
String path = parser.text();
paths.add(path);
}
bucketsPaths = paths.toArray(new String[paths.size()]);
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + pipelineAggregatorName + "]: [" + currentFieldName + "].");
}
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unexpected token " + token + " in [" + pipelineAggregatorName + "].");
}
}
if (bucketsPaths == null) {
throw new ParsingException(parser.getTokenLocation(), "Missing required field [" + BUCKETS_PATH.getPreferredName()
+ "] for derivative aggregation [" + pipelineAggregatorName + "]");
}
CumulativeSumPipelineAggregatorBuilder factory =
new CumulativeSumPipelineAggregatorBuilder(pipelineAggregatorName, bucketsPaths[0]);
if (format != null) {
factory.format(format);
}
return factory;
}
@Override
public CumulativeSumPipelineAggregatorBuilder getFactoryPrototype() {
return CumulativeSumPipelineAggregatorBuilder.PROTOTYPE;
}
}
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