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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
namespace vespalib {
class TraceNode;
/**
* This class is an abstract visitor of {@link TraceNode}. See {@link TraceNode#accept(TraceVisitor)}.
*/
struct TraceVisitor {
virtual ~TraceVisitor() { }
/**
* Visits a {@link TraceNode}. Called by {@link TraceNode#accept(TraceVisitor)}, before visiting its children.
*
* @param node the TraceNode being visited
* @see TraceNode#accept(TraceVisitor)
*/
virtual void visit(const TraceNode & node) = 0;
/**
* Enters a {@link TraceNode}. This method is called after {@link #visit(TraceNode)}, but before visiting its children.
* Note that this method is NOT called if TraceNode has zero children. The default implementation of this method does nothing.
*
* @param node The TraceNode being entered
* @see #leaving(TraceNode)
*/
virtual void entering(const TraceNode & node) { (void) node; }
/**
* Leaves a {@link TraceNode}. This method is called after {@link #entering(TraceNode)}, and after visiting its
* children. Note that this method is NOT called if TraceNode has zero children.
* The default implementation of this method does nothing.
*
* @param node the TraceNode being left
*/
virtual void leaving(const TraceNode & node) { (void) node; }
};
} // namespace vespalib
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