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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.having;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.Script.ScriptField;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorFactory;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class BucketSelectorParser 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 PARAMS_FIELD = new ParseField("params");
@Override
public String type() {
return BucketSelectorPipelineAggregator.TYPE.name();
}
@Override
public PipelineAggregatorFactory parse(String reducerName, XContentParser parser, SearchContext context) throws IOException {
XContentParser.Token token;
Script script = null;
String currentFieldName = null;
Map bucketsPathsMap = null;
GapPolicy gapPolicy = GapPolicy.SKIP;
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, BUCKETS_PATH)) {
bucketsPathsMap = new HashMap<>();
bucketsPathsMap.put("_value", parser.text());
} else if (context.parseFieldMatcher().match(currentFieldName, GAP_POLICY)) {
gapPolicy = GapPolicy.parse(context, parser.text(), parser.getTokenLocation());
} else if (context.parseFieldMatcher().match(currentFieldName, ScriptField.SCRIPT)) {
script = Script.parse(parser, context.parseFieldMatcher());
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + reducerName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (context.parseFieldMatcher().match(currentFieldName, BUCKETS_PATH)) {
List paths = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
String path = parser.text();
paths.add(path);
}
bucketsPathsMap = new HashMap<>();
for (int i = 0; i < paths.size(); i++) {
bucketsPathsMap.put("_value" + i, paths.get(i));
}
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + reducerName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token == XContentParser.Token.START_OBJECT) {
if (context.parseFieldMatcher().match(currentFieldName, ScriptField.SCRIPT)) {
script = Script.parse(parser, context.parseFieldMatcher());
} else if (context.parseFieldMatcher().match(currentFieldName, BUCKETS_PATH)) {
Map map = parser.map();
bucketsPathsMap = new HashMap<>();
for (Map.Entry entry : map.entrySet()) {
bucketsPathsMap.put(entry.getKey(), String.valueOf(entry.getValue()));
}
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + reducerName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + reducerName + "].",
parser.getTokenLocation());
}
}
if (bucketsPathsMap == null) {
throw new SearchParseException(context, "Missing required field [" + BUCKETS_PATH.getPreferredName()
+ "] for bucket_selector aggregation [" + reducerName + "]", parser.getTokenLocation());
}
if (script == null) {
throw new SearchParseException(context, "Missing required field [" + ScriptField.SCRIPT.getPreferredName()
+ "] for bucket_selector aggregation [" + reducerName + "]", parser.getTokenLocation());
}
return new BucketSelectorPipelineAggregator.Factory(reducerName, bucketsPathsMap, script, gapPolicy);
}
}