includes/opentelemetry/sdk/metrics/view/predicate_factory.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include <memory>
 
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/sdk/metrics/view/predicate.h"
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
 
enum class PredicateType : uint8_t
{
  kPattern,
  kExact
};
 
class PredicateFactory
{
public:
  static std::unique_ptr<Predicate> GetPredicate(opentelemetry::nostd::string_view pattern,
                                                 PredicateType type)
  {
    if ((type == PredicateType::kPattern && pattern == "*") ||
        (type == PredicateType::kExact && pattern == ""))
    {
      return std::unique_ptr<Predicate>(new MatchEverythingPattern());
    }
    if (type == PredicateType::kPattern)
    {
      return std::unique_ptr<Predicate>(new PatternPredicate(pattern));
    }
    if (type == PredicateType::kExact)
    {
      return std::unique_ptr<Predicate>(new ExactPredicate(pattern));
    }
    return std::unique_ptr<Predicate>(new MatchNothingPattern());
  }
};
}  // namespace metrics
}  // namespace sdk
OPENTELEMETRY_END_NAMESPACE