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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 <vespa/searchlib/fef/blueprint.h>
namespace vespalib { namespace eval { struct ConstantValue; } }
namespace search::features {
/**
* Implements the blueprint for the constant feature.
*
* An executor of this outputs the value of a named constant.
* This can either be a number or a tensor value.
*/
class ConstantBlueprint : public fef::Blueprint {
private:
vespalib::string _key; // 'foo'
std::unique_ptr<vespalib::eval::ConstantValue> _value;
public:
/**
* Constructs a constant blueprint.
*/
ConstantBlueprint();
~ConstantBlueprint() override;
void visitDumpFeatures(const fef::IIndexEnvironment &env, fef::IDumpFeatureVisitor &visitor) const override;
fef::Blueprint::UP createInstance() const override;
fef::ParameterDescriptions getDescriptions() const override {
return fef::ParameterDescriptions().desc().string();
}
bool setup(const fef::IIndexEnvironment &env, const fef::ParameterList ¶ms) override;
fef::FeatureExecutor &createExecutor(const fef::IQueryEnvironment &env, vespalib::Stash &stash) const override;
};
}
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