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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.tensor.functions;
import com.yahoo.tensor.evaluation.Name;
import com.yahoo.tensor.evaluation.TypeContext;
import java.util.Optional;
/**
* A context which is passed down to all nested functions when returning a string representation.
*
* @author bratseth
*/
public interface ToStringContext<NAMETYPE extends Name> {
static <NAMETYPE extends Name> ToStringContext<NAMETYPE> empty() { return new EmptyStringContext<>(); }
/** Returns the name an identifier is bound to, or null if not bound in this context */
String getBinding(String name);
/**
* Returns the context used to resolve types in this, if present.
* In some functions serialization depends on type information.
*/
default Optional<TypeContext<NAMETYPE>> typeContext() { return Optional.empty(); }
/**
* Returns the parent context of this (the context we're in scope of when this is created),
* or null if this is the root.
*/
ToStringContext<NAMETYPE> parent();
class EmptyStringContext<NAMETYPE extends Name> implements ToStringContext<NAMETYPE> {
@Override
public String getBinding(String name) { return null; }
@Override
public ToStringContext<NAMETYPE> parent() { return null; }
}
}
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