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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.grouping.request;
import com.google.common.annotations.Beta;
/**
* This class represents a lookup in a multivalue document
* attribute in a {@link GroupingExpression}. It takes the
* attribute (assumed to contain a sorted array) from the input
* {@link com.yahoo.search.result.Hit} and finds the index that
* the second (lookup) argument expression would have, with linear
* interpolation when the lookup argument is between two array
* element values.
*
* @author arnej27959
*/
@Beta
public class InterpolatedLookup extends DocumentValue {
private final String attributeName;
private final GroupingExpression arg2;
/**
* Constructs a new instance of this class.
*
* @param attributeName The attribute name the lookup should happen in
* @param lookupArg Expression giving a floating-point value for the lookup argument
*/
public InterpolatedLookup(String attributeName, GroupingExpression lookupArg) {
super("interpolatedlookup(" + attributeName + ", " + lookupArg + ")");
this.attributeName = attributeName;
this.arg2 = lookupArg;
}
/**
* Get the name of the attribute to be retrieved from the input hit.
* @return The attribute name.
*/
public String getAttributeName() {
return attributeName;
}
/**
* Get the expression that will be evaluated before lookup.
* @return grouping expression argument
*/
public GroupingExpression getLookupArgument() {
return arg2;
}
}
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