itkFileTools.h

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/*=========================================================================
 *
 *  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 itkFileTools_h
#define itkFileTools_h
 
#include <string>
 
namespace itk
{
 
class FileTools
{
public:
 
  static void
  CreateDirectory(const std::string & dir);
 
  static void
  CreateFile(const std::string & fn);
};
 
} // namespace itk
 
// here comes the implementation
 
#include "itksys/SystemTools.hxx"
#include "itkMacro.h"
 
namespace itk
{
 
inline void
FileTools::CreateDirectory(const std::string & dir)
{
  if (dir.empty() || itksys::SystemTools::FileExists(dir.c_str(), true))
  {
    ExceptionObject eo(__FILE__, __LINE__, "directory cannot be created");
    throw eo;
  }
  // do nothing if it already exists
  if (dir.empty() || "." == dir || itksys::SystemTools::FileIsDirectory(dir.c_str()))
  {
    return;
  }
 
  // create it
  itksys::SystemTools::MakeDirectory(dir.c_str());
 
  // check successful or not
  if (!itksys::SystemTools::FileIsDirectory(dir.c_str()))
  {
    ExceptionObject eo(__FILE__, __LINE__, "directory cannot be created");
    throw eo;
  }
}
 
inline void
FileTools::CreateFile(const std::string & fn)
{
  if (fn.empty() || itksys::SystemTools::FileIsDirectory(fn.c_str()))
  {
    ExceptionObject eo(__FILE__, __LINE__, "file cannot be created");
    throw eo;
  }
  // do nothing if it already exists
  if (itksys::SystemTools::FileExists(fn.c_str(), true))
  {
    return;
  }
 
  // make sure the directory exists
  const std::string dir = itksys::SystemTools::GetFilenamePath(fn.c_str());
  FileTools::CreateDirectory(dir);
 
  // create the file
  itksys::SystemTools::Touch(fn.c_str(), true);
 
  // check successful or not
  if (!itksys::SystemTools::FileExists(fn.c_str(), true))
  {
    ExceptionObject eo(__FILE__, __LINE__, "file cannot be created");
    throw eo;
  }
}
 
} // namespace itk
 
#endif // itkFileTools_h