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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.tensor.functions;
/**
* A context which is passed down to all nested functions when returning a string representation.
*
* @author bratseth
*/
public interface ToStringContext {
static ToStringContext 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 parent context of this (the context we're in scope of when this is created),
* or null if this is the root.
*/
ToStringContext parent();
class EmptyStringContext implements ToStringContext {
@Override
public String getBinding(String name) { return null; }
@Override
public ToStringContext parent() { return null; }
}
}
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