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* 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.
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package org.elasticsearch.search.aggregations.metrics.scripted;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.script.ScriptParameterParser;
import org.elasticsearch.script.ScriptParameterParser.ScriptParameterValue;
import org.elasticsearch.script.ScriptService.ScriptType;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class ScriptedMetricParser implements Aggregator.Parser {
public static final String INIT_SCRIPT = "init_script";
public static final String MAP_SCRIPT = "map_script";
public static final String COMBINE_SCRIPT = "combine_script";
public static final String REDUCE_SCRIPT = "reduce_script";
public static final ParseField PARAMS_FIELD = new ParseField("params");
public static final ParseField REDUCE_PARAMS_FIELD = new ParseField("reduce_params");
public static final ParseField LANG_FIELD = new ParseField("lang");
@Override
public String type() {
return InternalScriptedMetric.TYPE.name();
}
@Override
public AggregatorFactory parse(String aggregationName, XContentParser parser, SearchContext context) throws IOException {
String scriptLang = null;
Map<String, Object> params = null;
Map<String, Object> reduceParams = null;
XContentParser.Token token;
String currentFieldName = null;
Set<String> scriptParameters = new HashSet<>();
scriptParameters.add(INIT_SCRIPT);
scriptParameters.add(MAP_SCRIPT);
scriptParameters.add(COMBINE_SCRIPT);
scriptParameters.add(REDUCE_SCRIPT);
ScriptParameterParser scriptParameterParser = new ScriptParameterParser(scriptParameters);
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if (PARAMS_FIELD.match(currentFieldName)) {
params = parser.map();
} else if (REDUCE_PARAMS_FIELD.match(currentFieldName)) {
reduceParams = parser.map();
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: [" + currentFieldName + "].");
}
} else if (token.isValue()) {
if (!scriptParameterParser.token(currentFieldName, token, parser)) {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: [" + currentFieldName + "].");
}
} else {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + aggregationName + "].");
}
}
ScriptParameterValue initScriptValue = scriptParameterParser.getScriptParameterValue(INIT_SCRIPT);
String initScript = null;
ScriptType initScriptType = null;
if (initScriptValue != null) {
initScript = initScriptValue.script();
initScriptType = initScriptValue.scriptType();
}
ScriptParameterValue mapScriptValue = scriptParameterParser.getScriptParameterValue(MAP_SCRIPT);
String mapScript = null;
ScriptType mapScriptType = null;
if (mapScriptValue != null) {
mapScript = mapScriptValue.script();
mapScriptType = mapScriptValue.scriptType();
}
ScriptParameterValue combineScriptValue = scriptParameterParser.getScriptParameterValue(COMBINE_SCRIPT);
String combineScript = null;
ScriptType combineScriptType = null;
if (combineScriptValue != null) {
combineScript = combineScriptValue.script();
combineScriptType = combineScriptValue.scriptType();
}
ScriptParameterValue reduceScriptValue = scriptParameterParser.getScriptParameterValue(REDUCE_SCRIPT);
String reduceScript = null;
ScriptType reduceScriptType = null;
if (reduceScriptValue != null) {
reduceScript = reduceScriptValue.script();
reduceScriptType = reduceScriptValue.scriptType();
}
scriptLang = scriptParameterParser.lang();
if (mapScript == null) {
throw new SearchParseException(context, "map_script field is required in [" + aggregationName + "].");
}
return new ScriptedMetricAggregator.Factory(aggregationName, scriptLang, initScriptType, initScript, mapScriptType, mapScript,
combineScriptType, combineScript, reduceScriptType, reduceScript, params, reduceParams);
}
}