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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "simplequerystackitem.h"
#include <vespa/searchlib/util/rawbuf.h>
#include <vespa/vespalib/stllike/string.h>
namespace search {
/**
* A stack of SimpleQueryStackItems.
*
* A simple stack consisting of a list of SimpleQueryStackItems.
* It is able to generate a binary encoding of itself
* to a RawBuf.
*/
class SimpleQueryStack
{
private:
/** The number of items on the stack. */
uint32_t _numItems;
/** The top of the stack.
* Warning: FastQT_ProximityEmul currently assumes this is the head
* of a singly linked list (linked with _next).
*/
SimpleQueryStackItem *_stack;
public:
SimpleQueryStack(const SimpleQueryStack &) = delete;
SimpleQueryStack& operator=(const SimpleQueryStack &) = delete;
/**
* Constructor for SimpleQueryStack.
*/
SimpleQueryStack();
/**
* Destructor for SimpleQueryStack.
*/
~SimpleQueryStack();
/**
* Push an item on the stack.
* @param item The SimpleQueryStackItem to push.
*/
void Push(SimpleQueryStackItem *item);
/**
* Encode the contents of the stack in a binary buffer.
* @param buf Pointer to a buffer containing the encoded contents.
*/
void AppendBuffer(RawBuf *buf) const;
/**
* Return the number of items on the stack.
* @return The number of items on the stack.
*/
uint32_t GetSize();
/**
* Set the number of items on the stack.
* This can be used by QTs that change the stack
* under the hood. Use with care!
* @param numItems The number of items on the stack.
*/
void SetSize(uint32_t numItems) { _numItems = numItems; }
};
} // namespace search
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