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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.bucket.sampler;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSourceParser;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
/**
*
*/
public class SamplerParser implements Aggregator.Parser {
public static final int DEFAULT_SHARD_SAMPLE_SIZE = 100;
public static final ParseField SHARD_SIZE_FIELD = new ParseField("shard_size");
public static final ParseField MAX_DOCS_PER_VALUE_FIELD = new ParseField("max_docs_per_value");
public static final ParseField EXECUTION_HINT_FIELD = new ParseField("execution_hint");
public static final boolean DEFAULT_USE_GLOBAL_ORDINALS = false;
public static final int MAX_DOCS_PER_VALUE_DEFAULT = 1;
@Override
public String type() {
return InternalSampler.TYPE.name();
}
@Override
public AggregatorFactory parse(String aggregationName, XContentParser parser, SearchContext context) throws IOException {
XContentParser.Token token;
String currentFieldName = null;
String executionHint = null;
int shardSize = DEFAULT_SHARD_SAMPLE_SIZE;
int maxDocsPerValue = MAX_DOCS_PER_VALUE_DEFAULT;
ValuesSourceParser vsParser = null;
boolean diversityChoiceMade = false;
vsParser = ValuesSourceParser.any(aggregationName, InternalSampler.TYPE, context).scriptable(true).formattable(false).build();
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (vsParser.token(currentFieldName, token, parser)) {
continue;
} else if (token == XContentParser.Token.VALUE_NUMBER) {
if (context.parseFieldMatcher().match(currentFieldName, SHARD_SIZE_FIELD)) {
shardSize = parser.intValue();
} else if (context.parseFieldMatcher().match(currentFieldName, MAX_DOCS_PER_VALUE_FIELD)) {
diversityChoiceMade = true;
maxDocsPerValue = parser.intValue();
} else {
throw new SearchParseException(context, "Unsupported property \"" + currentFieldName + "\" for aggregation \""
+ aggregationName, parser.getTokenLocation());
}
} else if (!vsParser.token(currentFieldName, token, parser)) {
if (context.parseFieldMatcher().match(currentFieldName, EXECUTION_HINT_FIELD)) {
executionHint = parser.text();
} else {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + aggregationName + "].",
parser.getTokenLocation());
}
} else {
throw new SearchParseException(context, "Unsupported property \"" + currentFieldName + "\" for aggregation \""
+ aggregationName, parser.getTokenLocation());
}
}
ValuesSourceConfig vsConfig = vsParser.config();
if (vsConfig.valid()) {
return new SamplerAggregator.DiversifiedFactory(aggregationName, shardSize, executionHint, vsConfig, maxDocsPerValue);
} else {
if (diversityChoiceMade) {
throw new SearchParseException(context, "Sampler aggregation has " + MAX_DOCS_PER_VALUE_FIELD.getPreferredName()
+ " setting but no \"field\" or \"script\" setting to provide values for aggregation \"" + aggregationName + "\"",
parser.getTokenLocation());
}
return new SamplerAggregator.Factory(aggregationName, shardSize);
}
}
}