src/parquet/hasher.h

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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#ifndef PARQUET_HASHER_H
#define PARQUET_HASHER_H

#include <cstdint>
#include "parquet/types.h"

namespace parquet {
// Abstract class for hash
class Hasher {
 public:
  /// Compute hash for 32 bits value by using its plain encoding result.
  ///
  /// @param value the value to hash.
  /// @return hash result.
  virtual uint64_t Hash(int32_t value) const = 0;

  /// Compute hash for 64 bits value by using its plain encoding result.
  ///
  /// @param value the value to hash.
  /// @return hash result.
  virtual uint64_t Hash(int64_t value) const = 0;

  /// Compute hash for float value by using its plain encoding result.
  ///
  /// @param value the value to hash.
  /// @return hash result.
  virtual uint64_t Hash(float value) const = 0;

  /// Compute hash for double value by using its plain encoding result.
  ///
  /// @param value the value to hash.
  /// @return hash result.
  virtual uint64_t Hash(double value) const = 0;

  /// Compute hash for Int96 value by using its plain encoding result.
  ///
  /// @param value the value to hash.
  /// @return hash result.
  virtual uint64_t Hash(const Int96* value) const = 0;

  /// Compute hash for ByteArray value by using its plain encoding result.
  ///
  /// @param value the value to hash.
  /// @return hash result.
  virtual uint64_t Hash(const ByteArray* value) const = 0;

  /// Compute hash for fixed byte array value by using its plain encoding result.
  ///
  /// @param value the value to hash.
  /// @return hash result.
  virtual uint64_t Hash(const FLBA* value, uint32_t len) const = 0;

  virtual ~Hasher() = default;
};

}  // namespace parquet

#endif  // PARQUET_HASHER_H