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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/vespalib/stllike/hash_map.h>
namespace search::fef {
/**
* Top level interface for things to store in an IObjectStore.
*/
class Anything
{
public:
using UP = std::unique_ptr<Anything>;
virtual ~Anything() { }
};
/**
* Implementation of the Anything interface that wraps a value of the given type.
*/
template<typename T>
class AnyWrapper : public Anything
{
public:
AnyWrapper(T value) : _value(std::move(value)) { }
const T & getValue() const { return _value; }
static const T & getValue(const Anything & any) { return static_cast<const AnyWrapper &>(any).getValue(); }
private:
T _value;
};
/**
* Interface for a key value store of Anything instances.
*/
class IObjectStore
{
public:
virtual ~IObjectStore() { }
virtual void add(const vespalib::string & key, Anything::UP value) = 0;
virtual const Anything * get(const vespalib::string & key) const = 0;
};
/**
* Object store implementation on top of a hash map.
*/
class ObjectStore : public IObjectStore
{
public:
ObjectStore();
~ObjectStore();
void add(const vespalib::string & key, Anything::UP value) override;
const Anything * get(const vespalib::string & key) const override;
private:
using ObjectMap = vespalib::hash_map<vespalib::string, Anything *>;
ObjectMap _objectMap;
};
namespace objectstore {
/**
* Utility function that gets the value stored in an Anything instance (via AnyWrapper).
*/
template<typename T>
const T &
as_value(const Anything &val) {
using WrapperType = AnyWrapper<T>;
const auto *wrapper = dynamic_cast<const WrapperType *>(&val);
return wrapper->getValue();
}
}
}
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