refactor(core): Fix clang-tidy warnings in the streaming compressor interface and its implementations; Modernize and refactor test-StreamingCompression for conciseness.

components/core/src/clp/TraceableException.hpp

@@ -39,6 +39,7 @@ class TraceableException : public std::exception {
 // Macros
 // Define a version of __FILE__ that's relative to the source directory
 #ifdef SOURCE_PATH_SIZE
+   // NOLINTNEXTLINE
     #define __FILENAME__ ((__FILE__) + SOURCE_PATH_SIZE)
 #else
    // We don't know the source path size, so just default to __FILE__

components/core/src/clp/streaming_compression/Compressor.hpp

@@ -1,61 +1,81 @@
 #ifndef CLP_STREAMING_COMPRESSION_COMPRESSOR_HPP
 #define CLP_STREAMING_COMPRESSION_COMPRESSOR_HPP
 
-#include <cstdint>
-#include <string>
+#include <sys/types.h>
 
+#include <cstddef>
+
+#include "../ErrorCode.hpp"
+#include "../FileWriter.hpp"
 #include "../TraceableException.hpp"
 #include "../WriterInterface.hpp"
 #include "Constants.hpp"
 
 namespace clp::streaming_compression {
+/**
+ * Generic compressor interface.
+ */
 class Compressor : public WriterInterface {
 public:
     // Types
     class OperationFailed : public TraceableException {
     public:
         // Constructors
         OperationFailed(ErrorCode error_code, char const* const filename, int line_number)
-                : TraceableException(error_code, filename, line_number) {}
+                : TraceableException{error_code, filename, line_number} {}
 
         // Methods
-        char const* what() const noexcept override {
+        [[nodiscard]] auto what() const noexcept -> char const* override {
             return "streaming_compression::Compressor operation failed";
         }
     };
 
     // Constructor
-    explicit Compressor(CompressorType type) : m_type(type) {}
+    explicit Compressor(CompressorType type) : m_type{type} {}
 
     // Destructor
     virtual ~Compressor() = default;
 
-    // Explicitly disable copy and move constructor/assignment
+    // Delete copy constructor and assignment operator
     Compressor(Compressor const&) = delete;
-    Compressor& operator=(Compressor const&) = delete;
+    auto operator=(Compressor const&) -> Compressor& = delete;
+
+    // Default move constructor and assignment operator
+    Compressor(Compressor&&) noexcept = default;
+    auto operator=(Compressor&&) noexcept -> Compressor& = default;
 
     // Methods implementing the WriterInterface
     /**
      * Unsupported operation
      * @param pos
      * @return ErrorCode_Unsupported
      */
-    ErrorCode try_seek_from_begin(size_t pos) override { return ErrorCode_Unsupported; }
+    [[nodiscard]] auto try_seek_from_begin([[maybe_unused]] size_t pos) -> ErrorCode override {
+        return ErrorCode_Unsupported;
+    }
 
     /**
      * Unsupported operation
      * @param pos
      * @return ErrorCode_Unsupported
      */
-    ErrorCode try_seek_from_current(off_t offset) override { return ErrorCode_Unsupported; }
+    [[nodiscard]] auto try_seek_from_current([[maybe_unused]] off_t offset) -> ErrorCode override {
+        return ErrorCode_Unsupported;
+    }
 
     // Methods
     /**
-     * Closes the compression stream
+     * Closes the compressor
+     */
+    virtual auto close() -> void = 0;
+
+    /**
+     * Initializes the compression stream
+     * @param file_writer
      */
-    virtual void close() = 0;
+    virtual auto open(FileWriter& file_writer) -> void = 0;
 
-protected:
+private:
     // Variables
     CompressorType m_type;
 };

components/core/src/clp/streaming_compression/Constants.hpp

@@ -1,7 +1,6 @@
 #ifndef CLP_STREAMING_COMPRESSION_CONSTANTS_HPP
 #define CLP_STREAMING_COMPRESSION_CONSTANTS_HPP
 
-#include <cstddef>
 #include <cstdint>
 
 namespace clp::streaming_compression {

components/core/src/clp/streaming_compression/passthrough/Compressor.cpp

@@ -1,9 +1,18 @@
 #include "Compressor.hpp"
 
-#include "../../Defs.h"
+#include <cstddef>
+
+#include "../../ErrorCode.hpp"
+#include "../../TraceableException.hpp"
+#include "../Compressor.hpp"
+#include "../Constants.hpp"
 
 namespace clp::streaming_compression::passthrough {
-void Compressor::write(char const* data, size_t const data_length) {
+Compressor::Compressor()
+        : ::clp::streaming_compression::Compressor{CompressorType::ZSTD},
+          m_compressed_stream_file_writer{nullptr} {}
+
+auto Compressor::write(char const* data, size_t const data_length) -> void {
     if (nullptr == m_compressed_stream_file_writer) {
         throw OperationFailed(ErrorCode_NotInit, __FILENAME__, __LINE__);
     }
@@ -19,27 +28,27 @@ void Compressor::write(char const* data, size_t const data_length) {
     m_compressed_stream_file_writer->write(data, data_length);
 }
 
-void Compressor::flush() {
+auto Compressor::flush() -> void {
     if (nullptr == m_compressed_stream_file_writer) {
         throw OperationFailed(ErrorCode_NotInit, __FILENAME__, __LINE__);
     }
 
     m_compressed_stream_file_writer->flush();
 }
 
-ErrorCode Compressor::try_get_pos(size_t& pos) const {
+auto Compressor::try_get_pos(size_t& pos) const -> ErrorCode {
     if (nullptr == m_compressed_stream_file_writer) {
         return ErrorCode_NotInit;
     }
 
     return m_compressed_stream_file_writer->try_get_pos(pos);
 }
 
-void Compressor::close() {
+auto Compressor::close() -> void {
     m_compressed_stream_file_writer = nullptr;
 }
 
-void Compressor::open(FileWriter& file_writer) {
+auto Compressor::open(FileWriter& file_writer) -> void {
     m_compressed_stream_file_writer = &file_writer;
 }
 }  // namespace clp::streaming_compression::passthrough

components/core/src/clp/streaming_compression/passthrough/Compressor.hpp

@@ -1,6 +1,9 @@
 #ifndef CLP_STREAMING_COMPRESSION_PASSTHROUGH_COMPRESSOR_HPP
 #define CLP_STREAMING_COMPRESSION_PASSTHROUGH_COMPRESSOR_HPP
 
+#include <cstddef>
+
+#include "../../ErrorCode.hpp"
 #include "../../FileWriter.hpp"
 #include "../../TraceableException.hpp"
 #include "../Compressor.hpp"
@@ -16,54 +19,60 @@ class Compressor : public ::clp::streaming_compression::Compressor {
     public:
         // Constructors
         OperationFailed(ErrorCode error_code, char const* const filename, int line_number)
-                : TraceableException(error_code, filename, line_number) {}
+                : TraceableException{error_code, filename, line_number} {}
 
         // Methods
-        char const* what() const noexcept override {
+        [[nodiscard]] auto what() const noexcept -> char const* override {
             return "streaming_compression::passthrough::Compressor operation failed";
         }
     };
 
     // Constructors
-    Compressor()
-            : ::clp::streaming_compression::Compressor(CompressorType::Passthrough),
-              m_compressed_stream_file_writer(nullptr) {}
+    Compressor();
+
+    // Destructor
+    ~Compressor() override = default;
 
-    // Explicitly disable copy and move constructor/assignment
+    // Delete copy constructor and assignment operator
     Compressor(Compressor const&) = delete;
-    Compressor& operator=(Compressor const&) = delete;
+    auto operator=(Compressor const&) -> Compressor& = delete;
+
+    // Default move constructor and assignment operator
+    Compressor(Compressor&&) noexcept = default;
+    auto operator=(Compressor&&) noexcept -> Compressor& = default;
 
     // Methods implementing the WriterInterface
     /**
      * Writes the given data to the compressor
      * @param data
      * @param data_length
      */
-    void write(char const* data, size_t data_length) override;
+    auto write(char const* data, size_t data_length) -> void override;
+
     /**
      * Flushes any buffered data
      */
-    void flush() override;
+    auto flush() -> void override;
+
     /**
      * Tries to get the current position of the write head
      * @param pos Position of the write head
      * @return ErrorCode_NotInit if the compressor is not open
      * @return Same as FileWriter::try_get_pos
      */
-    ErrorCode try_get_pos(size_t& pos) const override;
+    [[nodiscard]] auto try_get_pos(size_t& pos) const -> ErrorCode override;
 
     // Methods implementing the Compressor interface
     /**
      * Closes the compressor
      */
-    void close() override;
+    auto close() -> void override;
 
-    // Methods
     /**
-     * Initializes the compressor
+     * Initializes the compression stream
      * @param file_writer
      */
-    void open(FileWriter& file_writer);
+    auto open(FileWriter& file_writer) -> void override;
 
 private:
     // Variables