GL Studio C++ Runtime API
file_path_class.h
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1 /*! \file
2  \brief A class to handle file paths.
3 
4  \par Copyright Information
5 
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39 */
40 #ifndef INCLUDED_FILE_PATH_CLASS_H
41 #define INCLUDED_FILE_PATH_CLASS_H
42 
43 #include "disti_metadata.h"
44 #include "util.h" // This is glstudio specific
45 #include <string>
46 
47 namespace disti
48 {
49 /** \class FilePathClass
50  *
51  * The FilePathClass represents a single absolute path.
52  * There are methods for getting the directory, filename,
53  * file extension, and checking the validity of the path.
54  * You can get a relative path string by comparing two FilePathClass objects.
55  * FilePathClass also has methods for reading/writing absolute or relative
56  * path strings, the class remembers which was last read and writes out
57  * the same way. You can change this behavior by modifying the
58  * WriteAsAbsolutePath() flag.
59  */
61 {
62 protected:
63  /** The complete path: format is "<directory>/<filename>.<extension>" where /
64  * is last slash and . is the first dot after the last slash */
65  std::string _path;
66 
67  /** Controls how the Path is written out when WritePathString is called
68  * Defaults to false */
70 
71 public:
72  /** Constructor. Path() is initially "" and invalid */
73  GLS_EXPORT FilePathClass();
74  /** Implicit conversion - Path() is set to stringPath */
75  GLS_EXPORT FilePathClass( const std::string& stringPath );
76  GLS_EXPORT FilePathClass( const char* stringPath );
77 
78  /** Return true if the path points to a directory or file that COULD exist
79  * (i.e. Path() will return a valid path as close as we can verify it.)*/
80  GLS_EXPORT bool IsValid() const;
81 
82  /** Return a string containing the characters that invalid to use in a path */
83  static GLS_EXPORT const std::string& InvalidPathChars();
84 
85  /** Return true if this file path references a file that exists.
86  * Applies only to files; returns false for directories.
87  * Returns true for symbolic links that exist, regardless whether the link's target exists.
88  */
89  GLS_EXPORT bool FileExists() const;
90 
91  /** Return true if the Directory() of this path DOES exist */
92  // Not Implemented
93  //GLS_EXPORT bool DirectoryExists() const;
94 
95  /** Create the Directory() for this path if it doesn't exist
96  * \return true if the directory exists
97  * \return false if there was an error creating the directory */
98  // Not Implemented
99  //GLS_EXPORT bool CreateDirectory() const;
100 
101  /** Return a string containing the relative path
102  * to this path from the given path's Directory
103  * Returns Path() if the relative path cannot be determined */
104  GLS_EXPORT std::string PathRelativeTo( const FilePathClass& basePath ) const;
105 
106  /** Return a string containing the complete path
107  * \note this method returns whatever is stored
108  * in the path whether it is valid or not */
109  const std::string& Path() const { return _path; }
110 
111  /** Get the directory containing the referenced file (includes trailing slash)
112  * "" if the Path is not valid */
113  GLS_EXPORT std::string Directory() const;
114 
115  /** Get the filename of the file (including the extension)
116  * "" if the Path is not valid or doesn't reference a file */
117  GLS_EXPORT std::string FileName() const;
118 
119  /** Get the file extension for the file (everything after the last ".")
120  * "" if the Path is not valid, doesn't reference a file, or the file has no extension */
121  GLS_EXPORT std::string FileExtension() const;
122 
123  /** Replace the current file extension with the specified string.
124  * This will also insert a '.' into the filename if needed.
125  * \param ext The new extension (e.g. "txt")
126  */
127  GLS_EXPORT void FileExtension( const std::string& ext );
128 
129  /** Equality operators
130  * If paths are equal they reference the same file
131  * If paths are not equal it doesn't guarantee that they reference different files */
132  GLS_EXPORT bool operator==( const FilePathClass& path ) const;
133  inline bool operator!=( const FilePathClass& path ) const { return !( *this == path ); }
134 
135  friend std::ostream& operator<<( std::ostream& outstr, const FilePathClass& path )
136  {
137  outstr << path.Path();
138  return outstr;
139  }
140 
141  friend std::istream& operator>>( std::istream& instr, FilePathClass& path )
142  {
143  instr >> path._path;
144  return instr;
145  }
146 
147  /** Assignment operator (absolute path) */
148  GLS_EXPORT FilePathClass& operator=( const FilePathClass& path );
149 
150  /** Set this object to point to the current working directory
151  * \return true on success, false if there was an error */
152  GLS_EXPORT bool SetToCWD();
153 
154  /** return true if the given string contains an absolute path */
155  static GLS_EXPORT bool StringIsAbsolutePath( const std::string& strPath );
156 
157  /** return true if the given string contains an relative path */
158  static GLS_EXPORT bool StringIsRelativePath( const std::string& strPath );
159 
160  /** return true if the given string contains a valid or absolute path as close as we can verify it */
161  static GLS_EXPORT bool StringIsValidPath( const std::string& strPath );
162 
163  /** Get and set the WriteAsAbsolutePath flag */
164  inline void WriteAsAbsolutePath( bool value ) { _writeAsAbsolutePath = value; }
165  inline bool WriteAsAbsolutePath() { return _writeAsAbsolutePath; }
166 
167  /** Read a relative or absolute path from a string
168  * \pre None
169  * \post If strPath was an absolute path or invalid then this path will be set to strPath and WriteAsAbsolutePath() will be true
170  * If strPath was relative, this path will be set to basePath + strPath and WriteAsAbsolutePath() will be false
171  * \param basePath Used to build a complete path if strPath contains a relative path
172  * \param strPath The string to read into
173  * \returns true on success or false if there was an error (basePath or strPath are invalid)
174  */
175  GLS_EXPORT bool ReadPathString( const FilePathClass& basePath, const std::string& strPath );
176 
177  /** Get the path string to write to a file
178  * This strPath will be either the absolute or relative path depending
179  * on the current setting of the WriteAsAbsolutePath() flag
180  * \param basePath Used to build a relative path if WriteAsAbsolutePath is false
181  * \param strPath The string to write to
182  */
183  GLS_EXPORT void WritePathString( const FilePathClass& basePath, std::string* strPath );
184 };
185 
186 /** Attribute for reading and writing FilePathClass objects as a clear string. */
188 {
189 protected:
190  FilePathClass* _attribPtr; // Pointer to the actual storage location
191  FilePathClass _localStoragePath; // only used by local storage constructor
192  const FilePathClass& _basePath; // Used for reading relative paths
193  bool _useEmptyTag; /**< true to use _emptyTag when writing path with WriteValue() if path does not have a filename */
194  static GLS_EXPORT const char _emptyTag[];
195 
196 public:
197  /** This constructor has the storage external
198  * \param basePath
199  * \param callback
200  * \param name
201  * \param attribPtr
202  * \param useEmptyTag [optional, defaults to false] true to use _emptyTag when writing path with WriteValue()
203  * if path does not have a filename
204  */
205  GLS_EXPORT DistiAttributeFilePathClass( const FilePathClass& basePath, CallbackMethodCallerBase* callback, const AttributeName& name, FilePathClass* attribPtr, bool useEmptyTag = false )
206  : DistiAttributeBase( callback, name, false )
207  , _attribPtr( attribPtr )
208  , _basePath( basePath )
209  , _useEmptyTag( useEmptyTag )
210  {
211  }
212 
213  /** Creates local storage, and will resize as needed
214  * \param basePath
215  * \param callback
216  * \param name
217  * \param initialValue
218  * \param useEmptyTag [optional, defaults to false] true to use _emptyTag when writing path with WriteValue()
219  * if path does not have a filename
220  */
221  GLS_EXPORT DistiAttributeFilePathClass( const FilePathClass& basePath, CallbackMethodCallerBase* callback, const AttributeName& name, FilePathClass initialValue, bool useEmptyTag = false )
222  : DistiAttributeBase( callback, name, true )
223  , _attribPtr( &_localStoragePath )
224  , _localStoragePath( initialValue )
225  , _basePath( basePath )
226  , _useEmptyTag( useEmptyTag )
227  {
228  }
229 
230  static const char* GetEmptyTag() { return _emptyTag; }
231 
232  virtual GLS_EXPORT DistiAttributeBase& operator=( const DistiAttributeBase& oldClass )
233  {
234  const DistiAttributeFilePathClass* ptr;
235  ptr = dynamic_cast<const DistiAttributeFilePathClass*>( &oldClass );
236  if( ptr )
237  {
238  *_attribPtr = *( ptr->_attribPtr );
239  CallCallback();
240  }
241  else
242  {
243  return DistiAttributeBase::operator=( oldClass );
244  }
245  return *this;
246  }
247 
248  virtual GLS_EXPORT std::ostream& WriteValue( std::ostream& outstr )
249  {
250  if( _attribPtr )
251  {
252  std::string strPath;
253 
254  if( _useEmptyTag && _attribPtr->FileName().empty() )
255  {
256  strPath = _emptyTag;
257  }
258  else
259  {
260  _attribPtr->WritePathString( _basePath, &strPath );
261  }
262 
263  outstr << strPath;
264  }
265 
266  return outstr;
267  }
268  virtual GLS_EXPORT std::istream& ReadValue( std::istream& instr )
269  {
270  std::string strPath;
271  GetToEnd( instr, strPath, true );
272 
273  if( _attribPtr )
274  {
275  // We have to always check for the empty tag
276  // for any backward compatability
277  if( strPath == _emptyTag )
278  {
279  strPath = "";
280  }
281 
282  _attribPtr->ReadPathString( _basePath, strPath );
283  CallCallback();
284  }
285 
286  return instr;
287  }
288 };
289 
290 /** This is a FilePathClass attribute that will save/read the path relative to the current working directory. */
292 {
293  FilePathClass _parentDocumentPath; // The parent document path, this is updated when we read and write
294 public:
295  /** This constructor has the storage external */
296  GLS_EXPORT DistiAttributeCWDRelativePath( CallbackMethodCallerBase* callback, const AttributeName& name, FilePathClass* attribPtr, bool useEmptyTag = false )
297  : DistiAttributeFilePathClass( _parentDocumentPath, callback, name, attribPtr, useEmptyTag )
298  {
299  }
300 
301  /** Creates local storage, and will resize as needed */
302  GLS_EXPORT DistiAttributeCWDRelativePath( CallbackMethodCallerBase* callback, const AttributeName& name, FilePathClass initialValue, bool useEmptyTag = false )
303  : DistiAttributeFilePathClass( _parentDocumentPath, callback, name, initialValue, useEmptyTag )
304  {
305  }
306 
307  virtual GLS_EXPORT std::ostream& WriteValue( std::ostream& outstr )
308  {
309  // update base path
310  _parentDocumentPath.SetToCWD();
311 
312  // write value as normal
314  }
315  virtual GLS_EXPORT std::istream& ReadValue( std::istream& instr )
316  {
317  // update base path
318  _parentDocumentPath.SetToCWD();
319 
320  // read value as normal
322  }
323 };
324 
325 } // end namespace disti
326 
327 #endif //_PATH_CLASS_H
std::string FileName() const
bool IsValid() const
FilePathClass & operator=(const FilePathClass &path)
The disti metadata.
virtual std::istream & ReadValue(std::istream &instr)
Definition: file_path_class.h:315
static bool StringIsValidPath(const std::string &strPath)
void WritePathString(const FilePathClass &basePath, std::string *strPath)
static bool StringIsAbsolutePath(const std::string &strPath)
bool FileExists() const
virtual DistiAttributeBase & operator=(const DistiAttributeBase &oldClass)
virtual DistiAttributeBase & operator=(const DistiAttributeBase &oldClass)
Definition: file_path_class.h:232
const std::string & Path() const
Definition: file_path_class.h:109
virtual std::ostream & WriteValue(std::ostream &outstr)
Definition: file_path_class.h:307
bool ReadPathString(const FilePathClass &basePath, const std::string &strPath)
std::string FileExtension() const
DistiAttributeCWDRelativePath(CallbackMethodCallerBase *callback, const AttributeName &name, FilePathClass *attribPtr, bool useEmptyTag=false)
Definition: file_path_class.h:296
virtual std::istream & ReadValue(std::istream &instr)
Definition: file_path_class.h:268
virtual void CallCallback()
DistiAttributeCWDRelativePath(CallbackMethodCallerBase *callback, const AttributeName &name, FilePathClass initialValue, bool useEmptyTag=false)
Definition: file_path_class.h:302
static const std::string & InvalidPathChars()
virtual std::ostream & WriteValue(std::ostream &outstr)
Definition: file_path_class.h:248
Generally useful defines, macros, enumerations and function prototypes.
static bool StringIsRelativePath(const std::string &strPath)
DistiAttributeFilePathClass(const FilePathClass &basePath, CallbackMethodCallerBase *callback, const AttributeName &name, FilePathClass initialValue, bool useEmptyTag=false)
Definition: file_path_class.h:221
Definition: disti_metadata.h:174
std::string Directory() const
Definition: file_path_class.h:60
Definition: callback_caller_base.h:55
std::string PathRelativeTo(const FilePathClass &basePath) const
Definition: file_path_class.h:291
bool _writeAsAbsolutePath
Definition: file_path_class.h:69
bool operator==(const FilePathClass &path) const
DistiAttributeFilePathClass(const FilePathClass &basePath, CallbackMethodCallerBase *callback, const AttributeName &name, FilePathClass *attribPtr, bool useEmptyTag=false)
Definition: file_path_class.h:205
bool _useEmptyTag
Definition: file_path_class.h:193
Definition: file_path_class.h:187
Definition: disti_metadata.h:79
Definition: bmpimage.h:46
void WriteAsAbsolutePath(bool value)
Definition: file_path_class.h:164
std::string _path
Definition: file_path_class.h:65