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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 "i_attribute_functor.h"
#include "iattributevector.h"
namespace search::attribute {
/**
* This is an interface used to access all registered attribute vectors.
**/
class IAttributeContext : public IAttributeExecutor {
public:
using string = vespalib::string;
/** Convenience typedefs **/
using UP = std::unique_ptr<IAttributeContext>;
/**
* Returns the attribute vector with the given name.
*
* @param name the name of the attribute vector.
* @return const view of the attribute vector or NULL if the attribute vector does not exists.
**/
virtual const IAttributeVector * getAttribute(const string & name) const = 0;
/**
* Returns the attribute vector with the given name.
* Makes sure that the underlying enum values are stable during the use of this attribute.
*
* @param name the name of the attribute vector
* @return const view of the attribute vector or NULL if the attribute vector does not exists.
**/
virtual const IAttributeVector * getAttributeStableEnum(const string & name) const = 0;
/**
* Fill the given list with all attribute vectors registered.
*
* @param list the list to fill in attribute vectors.
**/
virtual void getAttributeList(std::vector<const IAttributeVector *> & list) const = 0;
/**
* Releases all cached attribute guards.
**/
virtual void releaseEnumGuards() {}
/**
* Must be called before multiple threads will access the context.
*/
virtual void enableMultiThreadSafe() {}
/**
* Virtual destructor to allow safe subclassing.
**/
virtual ~IAttributeContext() = default;
};
}
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