/*
* 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.lucene.search.function.FieldValueFactorFunction;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilder;
import java.io.IOException;
import java.util.Locale;
/**
* Builder to construct {@code field_value_factor} functions for a function
* score query.
*/
public class FieldValueFactorFunctionBuilder extends ScoreFunctionBuilder {
private String field = null;
private Float factor = null;
private Double missing = null;
private FieldValueFactorFunction.Modifier modifier = null;
public FieldValueFactorFunctionBuilder(String fieldName) {
this.field = fieldName;
}
@Override
public String getName() {
return FieldValueFactorFunctionParser.NAMES[0];
}
public FieldValueFactorFunctionBuilder factor(float boostFactor) {
this.factor = boostFactor;
return this;
}
/**
* Value used instead of the field value for documents that don't have that field defined.
*/
public FieldValueFactorFunctionBuilder missing(double missing) {
this.missing = missing;
return this;
}
public FieldValueFactorFunctionBuilder modifier(FieldValueFactorFunction.Modifier modifier) {
this.modifier = modifier;
return this;
}
@Override
public void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(getName());
if (field != null) {
builder.field("field", field);
}
if (factor != null) {
builder.field("factor", factor);
}
if (missing != null) {
builder.field("missing", missing);
}
if (modifier != null) {
builder.field("modifier", modifier.toString().toLowerCase(Locale.ROOT));
}
builder.endObject();
}
}