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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.grouping.request;
/**
* This class represents a document attribute function in a {@link GroupingExpression}. It evaluates to the value of the
* named attribute in the input {@link com.yahoo.search.result.Hit}.
*
* @author Simon Thoresen Hult
* @author bratseth
*/
public class AttributeFunction extends DocumentValue {
private final String name;
/**
* Constructs a new instance of this class.
*
* @param attributeName the attribute name to assign to this.
*/
public AttributeFunction(String attributeName) {
this(null, null, attributeName);
}
private AttributeFunction(String label, Integer level, String attributeName) {
super("attribute(" + attributeName + ")", label, level);
this.name = attributeName;
}
@Override
public AttributeFunction copy() {
return new AttributeFunction(getLabel(), getLevelOrNull(), getAttributeName());
}
/**
* Returns the name of the attribute to retrieve from the input hit.
*
* @return the attribute name.
*/
public String getAttributeName() {
return name;
}
}
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