file_path.hh

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/*
 * file_name.hh
 *
 *  Created on: May 23, 2012
 *      Author: jb
 */

#ifndef FILE_NAME_HH_
#define FILE_NAME_HH_

#include <string>

#include "system/exceptions.hh"

using namespace std;




/**
 * @brief Dedicated class for storing path to input and output files.
 *
 * FilePath objects are constructed from given absolute or relative path to the file and its type (input or output).
 * Before you create any instance of the class you have to call static method @p set_io_dirs to set:
 * - working directory of the program (when it was started)
 * - root input directory, i.e. directory of the main input file (given by -s parameter)
 * - input directory, used to replace ${INPUT} placeholder (given by -i parameter)
 * - output directory, where all output files should be placed (given by -o parameter)
 *
 */

class FilePath {
public:


    TYPEDEF_ERR_INFO( EI_Path, string);
    DECLARE_EXCEPTION( ExcAbsOutputPath, << "Can not set absolute path " << EI_Path::qval << "for an output file."  );

    /// Possible types of file.
    enum FileType {
        input_file,
        output_file
    };

    /**
     * Default constructor, necessary when using  Input::Record::opt_val() to initialize a FilePath.
     */
    FilePath() : abs_file_path("/__NO_FILE_NAME_GIVEN__") {}

    /**
     * Translates the given absolute or relative path to a file @p file_path depending on the file type @p ft.
     *
     * For input files:
     * - For relative path prepend absolute path of the directory of the main input file (root directory).
     * - Replace ${INPUT} place holder with the input directory given at command line.
     *
     * For output files:
     * - Forbids absolute output paths.
     * - For relative output path prepends it by the output directory given at the command line.
     */
    FilePath(const string file_path, const  FileType ft);

    /**
     * Set:
     * - working directory (used only if the output directory is relative)
     * - root directory (of the main input file)
     * - input directory to replace ${INPUT} place holder
     * - output directory used as prefix to the output files (relative output dirs are relative to the working directory)
     */
    static void set_io_dirs(const string working_dir, const string root_input,const string input,const string output);

    /**
     * This class is implicitly convertible to string.
     */
    inline operator string() const
        {return abs_file_path;}

    /*!
     * @brief Add new item to place holder.
     *
     * Placeholder is extended by adding a single new item. The item can be used in the name of the input or output file name.
     * Currently, the only supported placeholder is ${INPUT}.
     *
     * @par Example usage:
     * @code
     *      FilePath::add_placeholder_item("${SUBST_VAL}", "path/value");
     * @endcode
     *
     * @param[in]   key Key of new item.
     * @param[in]   value Value of new item.
     */
    static void add_placeholder(string key,string value);

    /**
     * Return absolute path of actual working directory.
     */
    static const string get_absolute_working_dir();


private:
    /**
     * Substitutes placeholders in @p abs_file_path.
     */
    void substitute_value();


    /**
     * Test if get path is absolute for used operating system.
     */
    static bool is_absolute_path(const string path);


    /**
     * Check if directory stored in output_dir doesn't exist and create its
     */
    static bool create_output_dir();


    /**
     * Create canonical path of output directory given by relative path.
     */
    static void create_canonical_path(const string working_dir, const string output);


    /// Final absolute path to the file.
    string abs_file_path;

    /// dictionary of placeholders
    static std::map<string,string> placeholder;

    /// Prefix path for output files.
    static string output_dir;

    /// Prefix path for input files (directory of the main input file).
    static string root_dir;
};

#endif /* FILE_NAME_HH_ */