org.elasticsearch.search.aggregations.metrics.scripted.ScriptedMetricParser Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch - Open Source, Distributed, RESTful Search Engine
/*
* 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.metrics.scripted;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptParameterParser;
import org.elasticsearch.script.ScriptParameterParser.ScriptParameterValue;
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 INIT_SCRIPT_FIELD = new ParseField("init_script");
public static final ParseField MAP_SCRIPT_FIELD = new ParseField("map_script");
public static final ParseField COMBINE_SCRIPT_FIELD = new ParseField("combine_script");
public static final ParseField REDUCE_SCRIPT_FIELD = new ParseField("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 {
Script initScript = null;
Script mapScript = null;
Script combineScript = null;
Script reduceScript = null;
Map params = null;
Map reduceParams = null;
XContentParser.Token token;
String currentFieldName = null;
Set 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 (context.parseFieldMatcher().match(currentFieldName, INIT_SCRIPT_FIELD)) {
initScript = Script.parse(parser, context.parseFieldMatcher());
} else if (context.parseFieldMatcher().match(currentFieldName, MAP_SCRIPT_FIELD)) {
mapScript = Script.parse(parser, context.parseFieldMatcher());
} else if (context.parseFieldMatcher().match(currentFieldName, COMBINE_SCRIPT_FIELD)) {
combineScript = Script.parse(parser, context.parseFieldMatcher());
} else if (context.parseFieldMatcher().match(currentFieldName, REDUCE_SCRIPT_FIELD)) {
reduceScript = Script.parse(parser, context.parseFieldMatcher());
} else if (context.parseFieldMatcher().match(currentFieldName, PARAMS_FIELD)) {
params = parser.map();
} else if (context.parseFieldMatcher().match(currentFieldName, REDUCE_PARAMS_FIELD)) {
reduceParams = parser.map();
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token.isValue()) {
if (!scriptParameterParser.token(currentFieldName, token, parser, context.parseFieldMatcher())) {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + aggregationName + "].",
parser.getTokenLocation());
}
}
if (initScript == null) { // Didn't find anything using the new API so try using the old one instead
ScriptParameterValue scriptValue = scriptParameterParser.getScriptParameterValue(INIT_SCRIPT);
if (scriptValue != null) {
initScript = new Script(scriptValue.script(), scriptValue.scriptType(), scriptParameterParser.lang(), params);
}
} else if (initScript.getParams() != null) {
throw new SearchParseException(
context,
"init_script params are not supported. Parameters for the init_script must be specified in the params field on the scripted_metric aggregator not inside the init_script object",
parser.getTokenLocation());
}
if (mapScript == null) { // Didn't find anything using the new API so try using the old one instead
ScriptParameterValue scriptValue = scriptParameterParser.getScriptParameterValue(MAP_SCRIPT);
if (scriptValue != null) {
mapScript = new Script(scriptValue.script(), scriptValue.scriptType(), scriptParameterParser.lang(), params);
}
} else if (mapScript.getParams() != null) {
throw new SearchParseException(
context,
"map_script params are not supported. Parameters for the map_script must be specified in the params field on the scripted_metric aggregator not inside the map_script object",
parser.getTokenLocation());
}
if (combineScript == null) { // Didn't find anything using the new API so try using the old one instead
ScriptParameterValue scriptValue = scriptParameterParser.getScriptParameterValue(COMBINE_SCRIPT);
if (scriptValue != null) {
combineScript = new Script(scriptValue.script(), scriptValue.scriptType(), scriptParameterParser.lang(), params);
}
} else if (combineScript.getParams() != null) {
throw new SearchParseException(
context,
"combine_script params are not supported. Parameters for the combine_script must be specified in the params field on the scripted_metric aggregator not inside the combine_script object",
parser.getTokenLocation());
}
if (reduceScript == null) { // Didn't find anything using the new API so try using the old one instead
ScriptParameterValue scriptValue = scriptParameterParser.getScriptParameterValue(REDUCE_SCRIPT);
if (scriptValue != null) {
reduceScript = new Script(scriptValue.script(), scriptValue.scriptType(), scriptParameterParser.lang(), reduceParams);
}
}
if (mapScript == null) {
throw new SearchParseException(context, "map_script field is required in [" + aggregationName + "].", parser.getTokenLocation());
}
return new ScriptedMetricAggregator.Factory(aggregationName, initScript, mapScript, combineScript, reduceScript, params);
}
}