file_path_class.h

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/*! \file
  \brief  A class to handle file paths.

  \par Copyright Information

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*/
#ifndef INCLUDED_FILE_PATH_CLASS_H
#define INCLUDED_FILE_PATH_CLASS_H

#include <string>
#include "disti_metadata.h"
#include "util.h" // This is glstudio specific

namespace disti {

/** \class FilePathClass
  * 
  * The FilePathClass represents a single absolute path.
  * There are methods for getting the directory, filename, 
  * file extension, and checking the validity of the path.
  * You can get a relative path string by comparing two FilePathClass objects. 
  * FilePathClass also has methods for reading/writing absolute or relative
  * path strings, the class remembers which was last read and writes out
  * the same way.  You can change this behavior by modifying the
  * WriteAsAbsolutePath() flag.
  */
class FilePathClass
{
protected:
    /** The complete path: format is "<directory>/<filename>.<extension>" where /
      * is last slash and . is the first dot after the last slash */
    std::string _path;

    /** Controls how the Path is written out when WritePathString is called
      * Defaults to false */
    bool _writeAsAbsolutePath; 
public:
    /** Constructor. Path() is initially "" and invalid */
    GLS_EXPORT FilePathClass();
    /** Implicit conversion - Path() is set to stringPath */
    GLS_EXPORT FilePathClass(const std::string& stringPath);
    GLS_EXPORT FilePathClass(const char* stringPath);

    /** Return true if the path points to a directory or file that COULD exist 
      * (i.e. Path() will return a valid path as close as we can verify it.)*/
    GLS_EXPORT bool IsValid() const;

    /** Return a string containing the characters that invalid to use in a path */
    static GLS_EXPORT const std::string& InvalidPathChars();


    /** Return true if this file path references a file that exists.
      * Applies only to files; returns false for directories.
      * Returns true for symbolic links that exist, regardless whether the link's target exists.
      */
    GLS_EXPORT bool FileExists() const;

    /** Return true if the Directory() of this path DOES exist */
    // Not Implemented
    //GLS_EXPORT bool DirectoryExists() const;

    /** Create the Directory() for this path if it doesn't exist
      * \return true if the directory exists
      * \return false if there was an error creating the directory */
    // Not Implemented
    //GLS_EXPORT bool CreateDirectory() const;

    /** Return a string containing the relative path
      * to this path from the given path's Directory
      * Returns Path() if the relative path cannot be determined */
    GLS_EXPORT std::string PathRelativeTo(const FilePathClass& basePath) const;

    /** Return a string containing the complete path
      * \note this method returns whatever is stored
      * in the path whether it is valid or not */
    const std::string& Path() const {return _path;}

    /** Get the directory containing the referenced file (includes trailing slash)
      * "" if the Path is not valid */
    GLS_EXPORT std::string Directory() const;

    /** Get the filename of the file (including the extension)
      * "" if the Path is not valid or doesn't reference a file */
    GLS_EXPORT std::string FileName() const;

    /** Get the file extension for the file (everything after the last ".")
      * "" if the Path is not valid, doesn't reference a file, or the file has no extension */
    GLS_EXPORT std::string FileExtension() const;

    /** Replace the current file extension with the specified string.
      * This will also insert a '.' into the filename if needed.
      * \param ext The new extension (e.g. "txt")
      */
    GLS_EXPORT void FileExtension(const std::string& ext);

    /** Equality operators
      * If paths are equal they reference the same file
      * If paths are not equal it doesn't guarantee that they reference different files */
    GLS_EXPORT bool operator==(const FilePathClass& path) const;
    inline bool operator!=(const FilePathClass& path) const { return !(*this == path); }
    
    friend std::ostream& operator<<( std::ostream& outstr, const FilePathClass& path )
    {
        outstr << path.Path();
        return outstr;
    }   

    friend std::istream& operator>>( std::istream& instr, FilePathClass& path )
    {
        instr >> path._path;
        return instr;
    }

    /** Assignment operator (absolute path) */
    GLS_EXPORT FilePathClass& operator=(const FilePathClass& path);

    /** Set this object to point to the current working directory 
      * \return true on success, false if there was an error */
    GLS_EXPORT bool SetToCWD();

    /** return true if the given string contains an absolute path */
    static GLS_EXPORT bool StringIsAbsolutePath(const std::string& strPath);

    /** return true if the given string contains an relative path */
    static GLS_EXPORT bool StringIsRelativePath(const std::string& strPath);

    /** return true if the given string contains a valid or absolute path as close as we can verify it */
    static GLS_EXPORT bool StringIsValidPath(const std::string& strPath);

    /** Get and set the WriteAsAbsolutePath flag */
    inline void WriteAsAbsolutePath(bool value) { _writeAsAbsolutePath = value; }
    inline bool WriteAsAbsolutePath() { return _writeAsAbsolutePath; }

    /** Read a relative or absolute path from a string
      * \pre None
      * \post If strPath was an absolute path or invalid then this path will be set to strPath and WriteAsAbsolutePath() will be true
      *       If strPath was relative, this path will be set to basePath + strPath and WriteAsAbsolutePath() will be false
      * \param basePath Used to build a complete path if strPath contains a relative path
      * \param strPath The string to read into
      * \returns true on success or false if there was an error (basePath or strPath are invalid)
      */
    GLS_EXPORT bool ReadPathString(const FilePathClass& basePath, const std::string& strPath);

    /** Get the path string to write to a file
      * This strPath will be either the absolute or relative path depending
      * on the current setting of the WriteAsAbsolutePath() flag
      * \param basePath Used to build a relative path if WriteAsAbsolutePath is false
      * \param strPath The string to write to   
      */
    GLS_EXPORT void WritePathString(const FilePathClass& basePath, std::string* strPath);
};


/** Attribute for reading and writing FilePathClass objects as a clear string. */
class DistiAttributeFilePathClass : public DistiAttributeBase
{
protected:
    FilePathClass* _attribPtr; // Pointer to the actual storage location
    FilePathClass _localStoragePath; // only used by local storage constructor 
    const FilePathClass& _basePath;  // Used for reading relative paths
    bool _useEmptyTag;  /**< true to use _emptyTag when writing path with WriteValue() if path does not have a filename */
    static GLS_EXPORT const char _emptyTag[];
public:
    /** This constructor has the storage external 
      * \param basePath
      * \param callback
      * \param name
      * \param attribPtr
      * \param useEmptyTag [optional, defaults to false]  true to use _emptyTag when writing path with WriteValue()
      *                    if path does not have a filename
      */
    GLS_EXPORT DistiAttributeFilePathClass(const FilePathClass &basePath, CallbackMethodCallerBase* callback, const AttributeName &name, FilePathClass *attribPtr, bool useEmptyTag = false):
        DistiAttributeBase(callback, name, false),
        _attribPtr(attribPtr),
        _basePath(basePath),
        _useEmptyTag(useEmptyTag)
    {
    }

    /** Creates local storage, and will resize as needed
      * \param basePath
      * \param callback
      * \param name
      * \param initialValue
      * \param useEmptyTag [optional, defaults to false]  true to use _emptyTag when writing path with WriteValue()
      *                    if path does not have a filename
      */
    GLS_EXPORT DistiAttributeFilePathClass(const FilePathClass &basePath, CallbackMethodCallerBase* callback, const AttributeName &name, FilePathClass initialValue, bool useEmptyTag = false):
        DistiAttributeBase(callback, name, true),
        _attribPtr(&_localStoragePath),
        _localStoragePath(initialValue),
        _basePath(basePath),
        _useEmptyTag(useEmptyTag)
    {
    }

    static const char* GetEmptyTag(){ return _emptyTag; }

    virtual GLS_EXPORT DistiAttributeBase& operator = (const DistiAttributeBase & oldClass)
    {
        const DistiAttributeFilePathClass* ptr;
        ptr = dynamic_cast<const DistiAttributeFilePathClass*>(&oldClass);
        if (ptr)
        {
            *_attribPtr = *(ptr->_attribPtr);
            CallCallback();
        }
        else
        {
            return DistiAttributeBase::operator = (oldClass);
        }
        return *this;
    }

    virtual GLS_EXPORT std::ostream& WriteValue(std::ostream &outstr)
    {
        if(_attribPtr)
        {
            std::string strPath;

            if (_useEmptyTag && _attribPtr->FileName().empty())
            {
                strPath = _emptyTag;
            }
            else
            {
                _attribPtr->WritePathString(_basePath, &strPath);
            }

            outstr << strPath;
        }

        return outstr;
    }
    virtual GLS_EXPORT std::istream& ReadValue(std::istream &instr)
    {
        std::string strPath;
        GetToEnd(instr, strPath, true);
        
        if(_attribPtr)
        {
            // We have to always check for the empty tag
            // for any backward compatability
            if (strPath == _emptyTag)
            {
                strPath = "";
            }

            _attribPtr->ReadPathString(_basePath, strPath);
            CallCallback();
        }

        return instr;
    }
};

/** This is a FilePathClass attribute that will save/read the path relative to the current working directory. */
class DistiAttributeCWDRelativePath : public DistiAttributeFilePathClass
{
    FilePathClass _parentDocumentPath; // The parent document path, this is updated when we read and write
public:
    /** This constructor has the storage external */
    GLS_EXPORT DistiAttributeCWDRelativePath(CallbackMethodCallerBase* callback, const AttributeName &name, FilePathClass *attribPtr, bool useEmptyTag = false):
        DistiAttributeFilePathClass(_parentDocumentPath, callback, name, attribPtr, useEmptyTag)
    {
    }

    /** Creates local storage, and will resize as needed */
    GLS_EXPORT DistiAttributeCWDRelativePath(CallbackMethodCallerBase* callback, const AttributeName &name, FilePathClass initialValue, bool useEmptyTag = false):
        DistiAttributeFilePathClass(_parentDocumentPath, callback, name, initialValue, useEmptyTag)
    {
    }

    virtual GLS_EXPORT std::ostream& WriteValue(std::ostream &outstr)
    {
        // update base path
        _parentDocumentPath.SetToCWD();
        
        // write value as normal
        return DistiAttributeFilePathClass::WriteValue(outstr);
    }
    virtual GLS_EXPORT std::istream& ReadValue(std::istream &instr)
    {
        // update base path
        _parentDocumentPath.SetToCWD();

        // read value as normal
        return DistiAttributeFilePathClass::ReadValue(instr);
    }
};


} // end namespace disti

#endif //_PATH_CLASS_H