feat: Add InputStreamBase, base class of InputTextStream

Paved the way to share its source code with InputBinaryStream.

Author: N-Dekker

include/itkInputStreamBase.h

@@ -0,0 +1,112 @@
+/*=========================================================================
+ *
+ *  Copyright NumFOCUS
+ *
+ *  Licensed 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
+ *
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *=========================================================================*/
+#ifndef itkInputStreamBase_h
+#define itkInputStreamBase_h
+
+#include "itkPipeline.h"
+#include "itkWasmStringStream.h"
+
+#include <string>
+#include <sstream>
+#include <fstream>
+
+#include "WebAssemblyInterfaceExport.h"
+
+namespace itk
+{
+namespace wasm
+{
+
+/**
+ *\class InputStreamBase
+ * \brief Base class of input stream for an itk::wasm::Pipeline
+ *
+ * This stream is read from the filesystem or memory when ITK_WASM_PARSE_ARGS is called.
+ *
+ * Call `Get()` to get the std::istream & to use an input to a pipeline.
+ *
+ * \ingroup WebAssemblyInterface
+ */
+class WebAssemblyInterface_EXPORT InputStreamBase
+{
+public:
+  std::istream &
+  Get()
+  {
+    return *m_IStream;
+  }
+
+  std::istream *
+  GetPointer()
+  {
+    return m_IStream;
+  }
+
+  void
+  SetJSON(const std::string & json)
+  {
+    if (m_DeleteIStream && m_IStream != nullptr)
+    {
+      delete m_IStream;
+    }
+    m_DeleteIStream = false;
+    m_WasmStringStream = WasmStringStream::New();
+    m_WasmStringStream->SetJSON(json.c_str());
+
+    m_IStream = &(m_WasmStringStream->GetStringStream());
+  }
+
+  virtual void
+  SetFileName(const std::string & fileName) = 0;
+
+protected:
+  void
+  SetFile(const std::string & fileName, const std::ios_base::openmode openMode)
+  {
+    if (m_DeleteIStream && m_IStream != nullptr)
+    {
+      delete m_IStream;
+    }
+    m_IStream = new std::ifstream(fileName, openMode);
+    m_DeleteIStream = true;
+  }
+
+  InputStreamBase() = default;
+  virtual ~InputStreamBase()
+  {
+    if (m_DeleteIStream && m_IStream != nullptr)
+    {
+      delete m_IStream;
+    }
+  }
+
+private:
+  std::istream * m_IStream{ nullptr };
+  bool           m_DeleteIStream{ false };
+
+  WasmStringStream::Pointer m_WasmStringStream;
+};
+
+
+WebAssemblyInterface_EXPORT bool
+lexical_cast(const std::string & input, InputStreamBase & inputStream);
+
+} // end namespace wasm
+} // end namespace itk
+
+#endif

include/itkInputTextStream.h

@@ -18,14 +18,10 @@
 #ifndef itkInputTextStream_h
 #define itkInputTextStream_h
 
-#include "itkPipeline.h"
-#include "itkWasmStringStream.h"
+#include "itkInputStreamBase.h"
 
+#include <ios>
 #include <string>
-#include <sstream>
-#include <fstream>
-
-#include "WebAssemblyInterfaceExport.h"
 
 namespace itk
 {
@@ -36,72 +32,18 @@ namespace wasm
  *\class InputTextStream
  * \brief Input text std::istream for an itk::wasm::Pipeline
  *
- * This stream is read from the filesystem or memory when ITK_WASM_PARSE_ARGS is called.
- *
- * Call `Get()` to get the std::istream & to use an input to a pipeline.
- *
  * \ingroup WebAssemblyInterface
  */
-class WebAssemblyInterface_EXPORT InputTextStream
+class InputTextStream: public InputStreamBase
 {
 public:
-  std::istream &
-  Get()
-  {
-    return *m_IStream;
-  }
-
-  std::istream *
-  GetPointer()
-  {
-    return m_IStream;
-  }
-
   void
-  SetJSON(const std::string & json)
+  SetFileName(const std::string & fileName) override
   {
-    if (m_DeleteIStream && m_IStream != nullptr)
-    {
-      delete m_IStream;
-    }
-    m_DeleteIStream = false;
-    m_WasmStringStream = WasmStringStream::New();
-    m_WasmStringStream->SetJSON(json.c_str());
-
-    m_IStream = &(m_WasmStringStream->GetStringStream());
+    InputStreamBase::SetFile(fileName, std::ios_base::openmode{});
   }
-
-  void
-  SetFileName(const std::string & fileName)
-  {
-    if (m_DeleteIStream && m_IStream != nullptr)
-    {
-      delete m_IStream;
-    }
-    m_IStream = new std::ifstream(fileName, std::ifstream::in);
-    m_DeleteIStream = true;
-  }
-
-  InputTextStream() = default;
-  ~InputTextStream()
-  {
-    if (m_DeleteIStream && m_IStream != nullptr)
-    {
-      delete m_IStream;
-    }
-  }
-
-private:
-  std::istream * m_IStream{ nullptr };
-  bool           m_DeleteIStream{ false };
-
-  WasmStringStream::Pointer m_WasmStringStream;
 };
 
-
-WebAssemblyInterface_EXPORT bool
-lexical_cast(const std::string & input, InputTextStream & inputStream);
-
 } // end namespace wasm
 } // end namespace itk
 

src/CMakeLists.txt

@@ -14,7 +14,7 @@ set(WebAssemblyInterface_SRCS
   itkWasmTransformIOFactory.cxx
   itkWasmTransformIO.cxx
   itkWasmStringStream.cxx
-  itkInputTextStream.cxx
+  itkInputStreamBase.cxx
   itkOutputTextStream.cxx
   itkInputBinaryStream.cxx
   itkOutputBinaryStream.cxx

src/itkInputTextStream.cxx renamed to src/itkInputStreamBase.cxx

@@ -15,7 +15,7 @@
  *  limitations under the License.
  *
  *=========================================================================*/
-#include "itkInputTextStream.h"
+#include "itkInputStreamBase.h"
 
 #include <string>
 #ifndef ITK_WASM_NO_MEMORY_IO
@@ -28,7 +28,7 @@ namespace wasm
 {
 
 bool
-lexical_cast(const std::string & input, InputTextStream & inputStream)
+lexical_cast(const std::string & input, InputStreamBase & inputStream)
 {
   if (input.empty())
   {