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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.grouping.request;
import com.yahoo.api.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 lookupArgument;
/**
* Constructs a new instance of this class.
*
* @param attributeName the attribute name to assign to this.
* @param lookupArgument Expression giving a floating-point value for the lookup argument
*/
public InterpolatedLookup(String attributeName, GroupingExpression lookupArgument) {
this(null, null, attributeName, lookupArgument);
}
private InterpolatedLookup(String label, Integer level, String attributeName, GroupingExpression lookupArgument) {
super("interpolatedlookup(" + attributeName + ", " + lookupArgument + ")", label, level);
this.attributeName = attributeName;
this.lookupArgument = lookupArgument;
}
@Override
public InterpolatedLookup copy() {
return new InterpolatedLookup(getLabel(), getLevelOrNull(), getAttributeName(), getLookupArgument().copy());
}
/** Returns the name of the attribute to retrieve from the input hit */
public String getAttributeName() {
return attributeName;
}
/** Return the expression to evaluate before lookup */
public GroupingExpression getLookupArgument() {
return lookupArgument;
}
}
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