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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "unaryfunctionnode.h"
#include "integerresultnode.h"
#include "resultvector.h"
namespace search {
namespace expression {
class ZCurveFunctionNode : public UnaryFunctionNode
{
public:
enum Dimension {X=0, Y=1};
DECLARE_EXPRESSIONNODE(ZCurveFunctionNode);
DECLARE_NBO_SERIALIZE;
ZCurveFunctionNode() : _dim(X) { }
ZCurveFunctionNode(ExpressionNode::UP arg, Dimension dim) : UnaryFunctionNode(std::move(arg)), _dim(dim) { }
ZCurveFunctionNode(const ZCurveFunctionNode & rhs);
ZCurveFunctionNode & operator = (const ZCurveFunctionNode & rhs);
~ZCurveFunctionNode();
Dimension getDim() const { return _dim; }
private:
class Handler {
public:
Handler(Dimension dim) : _dim(dim) { }
virtual ~Handler() { }
virtual void handle(const ResultNode & arg) = 0;
protected:
void handleOne(const ResultNode & arg, Int64ResultNode & result) const {
result.set(getXorY(arg.getInteger()));
}
private:
int32_t getXorY(uint64_t z) const;
Dimension _dim;
};
class SingleValueHandler : public Handler {
public:
SingleValueHandler(ZCurveFunctionNode & ts) : Handler(ts.getDim()), _result(static_cast<Int64ResultNode &>(ts.updateResult())) { }
void handle(const ResultNode & arg) override;
private:
Int64ResultNode & _result;
};
class MultiValueHandler : public Handler {
public:
MultiValueHandler(ZCurveFunctionNode & ts) : Handler(ts.getDim()), _result(static_cast<IntegerResultNodeVector &>(ts.updateResult())) { }
void handle(const ResultNode & arg) override;
private:
IntegerResultNodeVector & _result;
};
bool onExecute() const override;
void onPrepareResult() override;
Dimension _dim;
std::unique_ptr<Handler> _handler;
};
}
}
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