org.elasticsearch.index.query.functionscore.DecayFunctionBuilder Maven / Gradle / Ivy
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* the Apache License, Version 2.0 (the "License"); you may
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
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package org.elasticsearch.index.query.functionscore;
import org.elasticsearch.ElasticsearchIllegalStateException;
import org.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
public abstract class DecayFunctionBuilder implements ScoreFunctionBuilder {
protected static final String ORIGIN = "origin";
protected static final String SCALE = "scale";
protected static final String DECAY = "decay";
protected static final String OFFSET = "offset";
private String fieldName;
private Object origin;
private Object scale;
private double decay = -1;
private Object offset;
public DecayFunctionBuilder(String fieldName, Object origin, Object scale) {
this.fieldName = fieldName;
this.origin = origin;
this.scale = scale;
}
public DecayFunctionBuilder setDecay(double decay) {
if (decay <= 0 || decay >= 1.0) {
throw new ElasticsearchIllegalStateException("scale weight parameter must be in range 0..1!");
}
this.decay = decay;
return this;
}
public DecayFunctionBuilder setOffset(Object offset) {
this.offset = offset;
return this;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(getName());
builder.startObject(fieldName);
if (origin != null) {
builder.field(ORIGIN, origin);
}
builder.field(SCALE, scale);
if (decay > 0) {
builder.field(DECAY, decay);
}
if (offset != null) {
builder.field(OFFSET, offset);
}
builder.endObject();
builder.endObject();
return builder;
}
}