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org.elasticsearch.search.aggregations.matrix.ArrayValuesSourceParser Maven / Gradle / Ivy
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations.matrix;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.script.Script;
import org.elasticsearch.search.aggregations.AggregationBuilder.CommonFields;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.support.CoreValuesSourceType;
import org.elasticsearch.search.aggregations.support.ValueType;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregationBuilder;
import org.elasticsearch.search.aggregations.support.ValuesSourceType;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.XContentParser;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public abstract class ArrayValuesSourceParser implements Aggregator.Parser {
public abstract static class NumericValuesSourceParser extends ArrayValuesSourceParser {
protected NumericValuesSourceParser(boolean formattable) {
super(formattable, CoreValuesSourceType.NUMERIC, ValueType.NUMERIC);
}
}
public abstract static class BytesValuesSourceParser extends ArrayValuesSourceParser {
protected BytesValuesSourceParser(boolean formattable) {
super(formattable, CoreValuesSourceType.KEYWORD, ValueType.STRING);
}
}
public abstract static class GeoPointValuesSourceParser extends ArrayValuesSourceParser {
protected GeoPointValuesSourceParser(boolean formattable) {
super(formattable, CoreValuesSourceType.GEOPOINT, ValueType.GEOPOINT);
}
}
private boolean formattable = false;
private ValuesSourceType valuesSourceType = null;
private ValueType targetValueType = null;
private ArrayValuesSourceParser(boolean formattable, ValuesSourceType valuesSourceType, ValueType targetValueType) {
this.valuesSourceType = valuesSourceType;
this.targetValueType = targetValueType;
this.formattable = formattable;
}
@Override
public final ArrayValuesSourceAggregationBuilder parse(String aggregationName, XContentParser parser) throws IOException {
List fields = null;
String format = null;
Map missingMap = null;
Map otherOptions = new HashMap<>();
XContentParser.Token token;
String currentFieldName = null;
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 (CommonFields.FIELDS.match(currentFieldName, parser.getDeprecationHandler())) {
fields = Collections.singletonList(parser.text());
} else if (formattable && CommonFields.FORMAT.match(currentFieldName, parser.getDeprecationHandler())) {
format = parser.text();
} else if (CommonFields.VALUE_TYPE.match(currentFieldName, parser.getDeprecationHandler())) {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token "
+ token
+ " ["
+ currentFieldName
+ "] in ["
+ aggregationName
+ "]. "
+ "Multi-field aggregations do not support scripts."
);
} else if (token(aggregationName, currentFieldName, token, parser, otherOptions) == false) {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token " + token + " [" + currentFieldName + "] in [" + aggregationName + "]."
);
}
} else if (token == XContentParser.Token.START_OBJECT) {
if (CommonFields.MISSING.match(currentFieldName, parser.getDeprecationHandler())) {
missingMap = new HashMap<>();
while (parser.nextToken() != XContentParser.Token.END_OBJECT) {
parseMissingAndAdd(aggregationName, currentFieldName, parser, missingMap);
}
} else if (Script.SCRIPT_PARSE_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token "
+ token
+ " ["
+ currentFieldName
+ "] in ["
+ aggregationName
+ "]. "
+ "Multi-field aggregations do not support scripts."
);
} else if (token(aggregationName, currentFieldName, token, parser, otherOptions) == false) {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token " + token + " [" + currentFieldName + "] in [" + aggregationName + "]."
);
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (Script.SCRIPT_PARSE_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token "
+ token
+ " ["
+ currentFieldName
+ "] in ["
+ aggregationName
+ "]. "
+ "Multi-field aggregations do not support scripts."
);
} else if (CommonFields.FIELDS.match(currentFieldName, parser.getDeprecationHandler())) {
fields = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
if (token == XContentParser.Token.VALUE_STRING) {
fields.add(parser.text());
} else {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token " + token + " [" + currentFieldName + "] in [" + aggregationName + "]."
);
}
}
} else if (token(aggregationName, currentFieldName, token, parser, otherOptions) == false) {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token " + token + " [" + currentFieldName + "] in [" + aggregationName + "]."
);
}
} else if (token(aggregationName, currentFieldName, token, parser, otherOptions) == false) {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token " + token + " [" + currentFieldName + "] in [" + aggregationName + "]."
);
}
}
ArrayValuesSourceAggregationBuilder factory = createFactory(
aggregationName,
this.valuesSourceType,
this.targetValueType,
otherOptions
);
if (fields != null) {
factory.fields(fields);
}
if (format != null) {
factory.format(format);
}
if (missingMap != null) {
factory.missingMap(missingMap);
}
return factory;
}
private void parseMissingAndAdd(
final String aggregationName,
final String currentFieldName,
XContentParser parser,
final Map missing
) throws IOException {
XContentParser.Token token = parser.currentToken();
if (token == null) {
token = parser.nextToken();
}
if (token == XContentParser.Token.FIELD_NAME) {
final String fieldName = parser.currentName();
if (missing.containsKey(fieldName)) {
throw new ParsingException(
parser.getTokenLocation(),
"Missing field [" + fieldName + "] already defined as [" + missing.get(fieldName) + "] in [" + aggregationName + "]."
);
}
parser.nextToken();
missing.put(fieldName, parser.objectText());
} else {
throw new ParsingException(
parser.getTokenLocation(),
"Unexpected token " + token + " [" + currentFieldName + "] in [" + aggregationName + "]"
);
}
}
/**
* Creates a {@link ValuesSourceAggregationBuilder} from the information
* gathered by the subclass. Options parsed in
* {@link ArrayValuesSourceParser} itself will be added to the factory
* after it has been returned by this method.
*
* @param aggregationName
* the name of the aggregation
* @param valuesSourceType
* the type of the {@link ValuesSource}
* @param targetValueType
* the target type of the final value output by the aggregation
* @param otherOptions
* a {@link Map} containing the extra options parsed by the
* {@link #token(String, String, XContentParser.Token, XContentParser, Map)}
* method
* @return the created factory
*/
protected abstract ArrayValuesSourceAggregationBuilder createFactory(
String aggregationName,
ValuesSourceType valuesSourceType,
ValueType targetValueType,
Map otherOptions
);
/**
* Allows subclasses of {@link ArrayValuesSourceParser} to parse extra
* parameters and store them in a {@link Map} which will later be passed to
* {@link #createFactory(String, ValuesSourceType, ValueType, Map)}.
*
* @param aggregationName
* the name of the aggregation
* @param currentFieldName
* the name of the current field being parsed
* @param token
* the current token for the parser
* @param parser
* the parser
* @param otherOptions
* a {@link Map} of options to be populated by successive calls
* to this method which will then be passed to the
* {@link #createFactory(String, ValuesSourceType, ValueType, Map)}
* method
* @return true if the current token was correctly parsed,
* false otherwise
* @throws IOException
* if an error occurs whilst parsing
*/
protected abstract boolean token(
String aggregationName,
String currentFieldName,
XContentParser.Token token,
XContentParser parser,
Map otherOptions
) throws IOException;
}
