// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
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// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef GOOGLE_PROTOBUF_UTIL_INTERNAL_ERROR_LISTENER_H__
#define GOOGLE_PROTOBUF_UTIL_INTERNAL_ERROR_LISTENER_H__

#include <algorithm>
#include <memory>
#include <string>
#include <vector>

#include <google/protobuf/stubs/callback.h>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/stubs/logging.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/util/internal/location_tracker.h>

// Must be included last.
#include <google/protobuf/port_def.inc>

namespace google {
namespace protobuf {
namespace util {
namespace converter {

// Interface for error listener.
class PROTOBUF_EXPORT ErrorListener {
 public:
  virtual ~ErrorListener() {}

  // Reports an invalid name at the given location.
  virtual void InvalidName(const LocationTrackerInterface& loc,
                           StringPiece invalid_name,
                           StringPiece message) = 0;

  // Reports an invalid value for a field.
  virtual void InvalidValue(const LocationTrackerInterface& loc,
                            StringPiece type_name,
                            StringPiece value) = 0;

  // Reports a missing required field.
  virtual void MissingField(const LocationTrackerInterface& loc,
                            StringPiece missing_name) = 0;

 protected:
  ErrorListener() {}

 private:
  // Do not add any data members to this class.
  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ErrorListener);
};

// An error listener that ignores all errors.
class PROTOBUF_EXPORT NoopErrorListener : public ErrorListener {
 public:
  NoopErrorListener() {}
  ~NoopErrorListener() override {}

  void InvalidName(const LocationTrackerInterface& /*loc*/,
                   StringPiece /* invalid_name */,
                   StringPiece /* message */) override {}

  void InvalidValue(const LocationTrackerInterface& /*loc*/,
                    StringPiece /* type_name */,
                    StringPiece /* value */) override {}

  void MissingField(const LocationTrackerInterface& /* loc */,
                    StringPiece /* missing_name */) override {}

 private:
  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(NoopErrorListener);
};


}  // namespace converter
}  // namespace util
}  // namespace protobuf
}  // namespace google

#include <google/protobuf/port_undef.inc>

#endif  // GOOGLE_PROTOBUF_UTIL_INTERNAL_ERROR_LISTENER_H__
