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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.index.query.functionscore.fieldvaluefactor;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.lucene.search.function.FieldValueFactorFunction;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.index.query.functionscore.ScoreFunctionParser;
import java.io.IOException;
/**
* Parses out a function_score function that looks like:
*
* <pre>
* {
* "field_value_factor": {
* "field": "myfield",
* "factor": 1.5,
* "modifier": "square",
* "missing": 1
* }
* }
* </pre>
*/
public class FieldValueFactorFunctionParser implements ScoreFunctionParser<FieldValueFactorFunctionBuilder> {
public static String[] NAMES = { "field_value_factor", "fieldValueFactor" };
private static final FieldValueFactorFunctionBuilder PROTOTYPE = new FieldValueFactorFunctionBuilder("");
@Override
public FieldValueFactorFunctionBuilder fromXContent(QueryParseContext parseContext, XContentParser parser) throws IOException, ParsingException {
String currentFieldName = null;
String field = null;
float boostFactor = FieldValueFactorFunctionBuilder.DEFAULT_FACTOR;
FieldValueFactorFunction.Modifier modifier = FieldValueFactorFunction.Modifier.NONE;
Double missing = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if ("field".equals(currentFieldName)) {
field = parser.text();
} else if ("factor".equals(currentFieldName)) {
boostFactor = parser.floatValue();
} else if ("modifier".equals(currentFieldName)) {
modifier = FieldValueFactorFunction.Modifier.fromString(parser.text());
} else if ("missing".equals(currentFieldName)) {
missing = parser.doubleValue();
} else {
throw new ParsingException(parser.getTokenLocation(), NAMES[0] + " query does not support [" + currentFieldName + "]");
}
} else if("factor".equals(currentFieldName) && (token == XContentParser.Token.START_ARRAY || token == XContentParser.Token.START_OBJECT)) {
throw new ParsingException(parser.getTokenLocation(), "[" + NAMES[0] + "] field 'factor' does not support lists or objects");
}
}
if (field == null) {
throw new ParsingException(parser.getTokenLocation(), "[" + NAMES[0] + "] required field 'field' missing");
}
FieldValueFactorFunctionBuilder fieldValueFactorFunctionBuilder = new FieldValueFactorFunctionBuilder(field).factor(boostFactor).modifier(modifier);
if (missing != null) {
fieldValueFactorFunctionBuilder.missing(missing);
}
return fieldValueFactorFunctionBuilder;
}
@Override
public String[] getNames() {
return NAMES;
}
@Override
public FieldValueFactorFunctionBuilder getBuilderPrototype() {
return PROTOTYPE;
}
}
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