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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.bucketmetrics;
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.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A parser for parsing requests for a {@link BucketMetricsPipelineAggregator}
*/
public abstract class BucketMetricsParser implements PipelineAggregator.Parser {
public static final ParseField FORMAT = new ParseField("format");
public BucketMetricsParser() {
super();
}
@Override
public final BucketMetricsPipelineAggregationBuilder<?> parse(String pipelineAggregatorName, QueryParseContext context)
throws IOException {
XContentParser parser = context.parser();
XContentParser.Token token;
String currentFieldName = null;
String[] bucketsPaths = null;
String format = null;
GapPolicy gapPolicy = null;
Map<String, Object> params = new HashMap<>(5);
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 (FORMAT.match(currentFieldName)) {
format = parser.text();
} else if (BUCKETS_PATH.match(currentFieldName)) {
bucketsPaths = new String[] { parser.text() };
} else if (GAP_POLICY.match(currentFieldName)) {
gapPolicy = GapPolicy.parse(context, parser.text(), parser.getTokenLocation());
} else {
parseToken(pipelineAggregatorName, parser, context, currentFieldName, token, params);
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (BUCKETS_PATH.match(currentFieldName)) {
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 {
parseToken(pipelineAggregatorName, parser, context, currentFieldName, token, params);
}
} else {
parseToken(pipelineAggregatorName, parser, context, currentFieldName, token, params);
}
}
if (bucketsPaths == null) {
throw new ParsingException(parser.getTokenLocation(),
"Missing required field [" + BUCKETS_PATH.getPreferredName() + "] for aggregation [" + pipelineAggregatorName + "]");
}
BucketMetricsPipelineAggregationBuilder<?> factory = buildFactory(pipelineAggregatorName, bucketsPaths[0], params);
if (format != null) {
factory.format(format);
}
if (gapPolicy != null) {
factory.gapPolicy(gapPolicy);
}
assert(factory != null);
return factory;
}
protected abstract BucketMetricsPipelineAggregationBuilder<?> buildFactory(String pipelineAggregatorName, String bucketsPaths,
Map<String, Object> params);
protected boolean token(XContentParser parser, QueryParseContext context, String field,
XContentParser.Token token, Map<String, Object> params) throws IOException {
return false;
}
private void parseToken(String aggregationName, XContentParser parser, QueryParseContext context, String currentFieldName,
XContentParser.Token currentToken, Map<String, Object> params) throws IOException {
if (token(parser, context, currentFieldName, currentToken, params) == false) {
throw new ParsingException(parser.getTokenLocation(),
"Unexpected token " + currentToken + " [" + currentFieldName + "] in [" + aggregationName + "]");
}
}
}
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