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// Author: wan@google.com (Zhanyong Wan)

// Google Mock - a framework for writing C++ mock classes.

//

// This file implements some commonly used cardinalities.  More

// cardinalities can be defined by the user implementing the

// CardinalityInterface interface if necessary.

#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_

#define GMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_

#include <limits.h>

#include <ostream>  // NOLINT

#include "gmock/internal/gmock-port.h"

#include "gtest/gtest.h"

namespace testing {

// To implement a cardinality Foo, define:

//   1. a class FooCardinality that implements the

//      CardinalityInterface interface, and

//   2. a factory function that creates a Cardinality object from a

//      const FooCardinality*.

//

// The two-level delegation design follows that of Matcher, providing

// consistency for extension developers.  It also eases ownership

// management as Cardinality objects can now be copied like plain values.

// The implementation of a cardinality.

class CardinalityInterface {

 public:

  virtual ~CardinalityInterface() {}

  // Conservative estimate on the lower/upper bound of the number of

  // calls allowed.

  virtual int ConservativeLowerBound() const { return 0; }

  virtual int ConservativeUpperBound() const { return INT_MAX; }

  // Returns true iff call_count calls will satisfy this cardinality.

  virtual bool IsSatisfiedByCallCount(int call_count) const = 0;

  // Returns true iff call_count calls will saturate this cardinality.

  virtual bool IsSaturatedByCallCount(int call_count) const = 0;

  // Describes self to an ostream.

  virtual void DescribeTo(::std::ostream* os) const = 0;

};

// A Cardinality is a copyable and IMMUTABLE (except by assignment)

// object that specifies how many times a mock function is expected to

// be called.  The implementation of Cardinality is just a linked_ptr

// to const CardinalityInterface, so copying is fairly cheap.

// Don't inherit from Cardinality!

class GTEST_API_ Cardinality {

 public:

  // Constructs a null cardinality.  Needed for storing Cardinality

  // objects in STL containers.

  Cardinality() {}

  // Constructs a Cardinality from its implementation.

  explicit Cardinality(const CardinalityInterface* impl) : impl_(impl) {}

  // Conservative estimate on the lower/upper bound of the number of

  // calls allowed.

  int ConservativeLowerBound() const { return impl_->ConservativeLowerBound(); }

  int ConservativeUpperBound() const { return impl_->ConservativeUpperBound(); }

  // Returns true iff call_count calls will satisfy this cardinality.

  bool IsSatisfiedByCallCount(int call_count) const {

    return impl_->IsSatisfiedByCallCount(call_count);

  }

  // Returns true iff call_count calls will saturate this cardinality.

  bool IsSaturatedByCallCount(int call_count) const {

    return impl_->IsSaturatedByCallCount(call_count);

  }

  // Returns true iff call_count calls will over-saturate this

  // cardinality, i.e. exceed the maximum number of allowed calls.

  bool IsOverSaturatedByCallCount(int call_count) const {

    return impl_->IsSaturatedByCallCount(call_count) &&

        !impl_->IsSatisfiedByCallCount(call_count);

  }

  // Describes self to an ostream

  void DescribeTo(::std::ostream* os) const { impl_->DescribeTo(os); }

  // Describes the given actual call count to an ostream.

  static void DescribeActualCallCountTo(int actual_call_count,

                                        ::std::ostream* os);

 private:

  internal::linked_ptr<const CardinalityInterface> impl_;

};

// Creates a cardinality that allows at least n calls.

GTEST_API_ Cardinality AtLeast(int n);

// Creates a cardinality that allows at most n calls.

GTEST_API_ Cardinality AtMost(int n);

// Creates a cardinality that allows any number of calls.

GTEST_API_ Cardinality AnyNumber();

// Creates a cardinality that allows between min and max calls.

GTEST_API_ Cardinality Between(int min, int max);

// Creates a cardinality that allows exactly n calls.

GTEST_API_ Cardinality Exactly(int n);

// Creates a cardinality from its implementation.

inline Cardinality MakeCardinality(const CardinalityInterface* c) {

  return Cardinality(c);

}

}  // namespace testing

#endif  // GMOCK_INCLUDE_GMOCK_GMOCK_CARDINALITIES_H_