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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.searchlib.rankingexpression.evaluation;
/**
* Indexed context lookup methods.
* Any context which implements these methods supports optimizations where map lookups
* are replaced by indexed lookups.
*
* @author bratseth
*/
public interface ContextIndex {
/** Returns the number of bound variables in this */
int size();
/**
* Returns the index from a name.
*
* @throws NullPointerException is this name is not known to this context
*/
int getIndex(String name);
Value get(int index);
double getDouble(int index);
}
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