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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 "multiargfunctionnode.h"
#include "resultvector.h"
namespace search::expression {
class NumericFunctionNode : public MultiArgFunctionNode
{
public:
DECLARE_ABSTRACT_EXPRESSIONNODE(NumericFunctionNode);
NumericFunctionNode();
NumericFunctionNode(const NumericFunctionNode & rhs);
NumericFunctionNode & operator = (const NumericFunctionNode & rhs);
~NumericFunctionNode();
void reset() override { _handler.reset(); MultiArgFunctionNode::reset(); }
protected:
void onPrepare(bool preserveAccurateTypes) override;
class Handler
{
public:
Handler(const NumericFunctionNode & func) : _function(func) { }
virtual ~Handler() { }
virtual void handle(const ResultNode & arg) = 0;
virtual void handleFirst(const ResultNode & arg) = 0;
protected:
const NumericFunctionNode & function() const { return _function; }
private:
const NumericFunctionNode & _function;
};
template <typename T>
class VectorHandler : public Handler
{
protected:
VectorHandler(const NumericFunctionNode & func) :
Handler(func),
_result(static_cast<T &>(func.updateResult()))
{ }
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override;
private:
T & _result;
};
class VectorIntegerHandler : public VectorHandler<IntegerResultNodeVector>
{
private:
using BaseHandler = VectorHandler<IntegerResultNodeVector>;
public:
VectorIntegerHandler(const NumericFunctionNode & func) : BaseHandler(func) { }
};
class VectorFloatHandler : public VectorHandler<FloatResultNodeVector>
{
private:
using BaseHandler = VectorHandler<FloatResultNodeVector>;
public:
VectorFloatHandler(const NumericFunctionNode & func) : BaseHandler(func) { }
};
class VectorStringHandler : public VectorHandler<StringResultNodeVector>
{
private:
using BaseHandler = VectorHandler<StringResultNodeVector>;
public:
VectorStringHandler(const NumericFunctionNode & func) : BaseHandler(func) { }
};
private:
virtual ResultNode::CP getInitialValue() const = 0;
virtual ResultNode & flatten(const ResultNodeVector & v, ResultNode & result) const = 0;
class ScalarIntegerHandler : public Handler
{
public:
ScalarIntegerHandler(const NumericFunctionNode & func) :
Handler(func),
_result(static_cast<Int64ResultNode &>(func.updateResult()))
{ }
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override { _result.set(arg.getInteger()); }
protected:
Int64ResultNode & _result;
};
class ScalarFloatHandler : public Handler
{
public:
ScalarFloatHandler(const NumericFunctionNode & func) :
Handler(func),
_result(static_cast<FloatResultNode &>(func.updateResult()))
{ }
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override { _result.set(arg.getFloat()); }
protected:
FloatResultNode & _result;
};
class ScalarStringHandler : public Handler
{
public:
ScalarStringHandler(const NumericFunctionNode & func) :
Handler(func),
_result(static_cast<StringResultNode &>(func.updateResult()))
{ }
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override {
char buf[32];
vespalib::ConstBufferRef b = arg.getString(vespalib::BufferRef(buf, sizeof(buf)));
_result.set(vespalib::stringref(b.c_str(), b.size()));
}
protected:
StringResultNode & _result;
};
class ScalarRawHandler : public Handler
{
public:
ScalarRawHandler(const NumericFunctionNode & func) :
Handler(func),
_result(static_cast<RawResultNode &>(func.updateResult()))
{ }
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override {
char buf[32];
vespalib::ConstBufferRef b = arg.getString(vespalib::BufferRef(buf, sizeof(buf)));
_result.setBuffer(b.data(), b.size());
}
protected:
RawResultNode & _result;
};
class FlattenIntegerHandler : public ScalarIntegerHandler
{
public:
FlattenIntegerHandler(const NumericFunctionNode & func) :
ScalarIntegerHandler(func),
_initial()
{
_initial.set(*func.getInitialValue());
}
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override { handle(arg); }
private:
Int64ResultNode _initial;
};
class FlattenFloatHandler : public ScalarFloatHandler
{
public:
FlattenFloatHandler(const NumericFunctionNode & func) :
ScalarFloatHandler(func),
_initial()
{
_initial.set(*func.getInitialValue());
}
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override { handle(arg); }
private:
FloatResultNode _initial;
};
class FlattenStringHandler : public ScalarStringHandler
{
public:
FlattenStringHandler(const NumericFunctionNode & func) :
ScalarStringHandler(func),
_initial()
{
_initial.set(*func.getInitialValue());
}
void handle(const ResultNode & arg) override;
void handleFirst(const ResultNode & arg) override { handle(arg); }
private:
StringResultNode _initial;
};
bool onCalculate(const ExpressionNodeVector & args, ResultNode & result) const override;
std::unique_ptr<Handler> _handler;
};
}
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