src/gromacs/options/filenameoptionmanager.h

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  35 /*! \file
  36  * \brief
  37  * Declares gmx::FileNameOptionManager.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inpublicapi
  41  * \ingroup module_options
  42  */
  43 #ifndef GMX_OPTIONS_FILENAMEOPTIONMANAGER_H
  44 #define GMX_OPTIONS_FILENAMEOPTIONMANAGER_H
  45
  46 #include <string>
  47
  48 #include "gromacs/options/options.h"
  49 #include "gromacs/utility/classhelpers.h"
  50
  51 namespace gmx
  52 {
  53
  54 class FileNameOptionInfo;
  55 class IFileInputRedirector;
  56 class IOptionsContainer;
  57
  58 /*! \brief
  59  * Handles interaction of file name options with global options.
  60  *
  61  * This class contains all logic that completes file names based on user input
  62  * and file system contents.  Additionally, this class implements support for a
  63  * global default file name that overrides any option-specific default, as well
  64  * as additional control over how the completion is done.
  65  *
  66  * \todo
  67  * Most of the functionality in this class is specific to command line parsing,
  68  * so it would be cleaner to replace this with an interface, and have the
  69  * actual code in the `commandline` module.
  70  *
  71  * Adding a FileNameOptionManager for an Options object is optional, even if
  72  * the Options contains FileNameOption options.  Features from the manager are
  73  * not available if the manager is not created, but otherwise the options work:
  74  * the values provided to FileNameOption are used as they are, and exceptions
  75  * are thrown if they are no valid instead of attempting to complete them.
  76  *
  77  * \see Options::addManager()
  78  *
  79  * \inpublicapi
  80  * \ingroup module_selection
  81  */
  82 class FileNameOptionManager : public IOptionManager
  83 {
  84     public:
  85         FileNameOptionManager();
  86         virtual ~FileNameOptionManager();
  87
  88         /*! \brief
  89          * Redirects file existence checks.
  90          *
  91          * \param[in] redirector  File redirector to use for existence checks.
  92          *
  93          * The manager checks for existence of various files on the file system
  94          * to complete file extensions.  This method can be used to redirect
  95          * those checks to an alternative implementation.
  96          *
  97          * This is used for unit tests to more easily control the result of the
  98          * checks and to keep the tests as fast as possible by avoiding real
  99          * file system access.  To keep implementation options open, behavior
 100          * with `redirector == NULL` is undefined and should not be relied on.
 101          * For tests, there should only be need to call this a single time,
 102          * right after creating the manager.
 103          */
 104         void setInputRedirector(const IFileInputRedirector *redirector);
 105
 106         /*! \brief
 107          * Disables special input file option handling.
 108          *
 109          * If disabled, this removes all file system calls from the file
 110          * name option parsing.
 111          * The values returned by FileNameOption for input and input/output
 112          * files are handled with the same simple rule as for output files:
 113          * the default extension is added if the file does not end in a
 114          * recognized extension, and no other checking is done.
 115          *
 116          * This changes the following behavior:
 117          *  - Providing non-existent files does not trigger errors.
 118          *  - Extensions for input files are not completed to an existing file.
 119          *  - Compressed input files do not work.
 120          */
 121         void disableInputOptionChecking(bool bDisable);
 122
 123         /*! \brief
 124          * Adds an option for setting the default global file name.
 125          *
 126          * \param     options Options to add the option to.
 127          * \param[in] name    Name of the option to add.
 128          *
 129          * If the user sets the option, it affects all file name options that
 130          * would normally return a default value: the basename for the returned
 131          * value is taken from the value of the default file name option,
 132          * instead from an option-specific default
 133          * (FileNameOption::defaultBaseName()).
 134          */
 135         void addDefaultFileNameOption(IOptionsContainer *options, const char *name);
 136
 137         /*! \brief
 138          * Completes file name option values.
 139          *
 140          * \param[in] value  Value provided by the user.
 141          * \param[in] option Option for which the value should be completed.
 142          * \returns   Value for the file name option.
 143          * \throws    std::bad_alloc if out of memory.
 144          * \throws    InvalidInputError if the value is not valid for this
 145          *     option.
 146          *
 147          * This method is called for each value that the user provides to
 148          * a FileNameOption.  The return value (if non-empty) is used as the
 149          * value of the option instead of the user-provided one.
 150          */
 151         std::string completeFileName(const std::string        &value,
 152                                      const FileNameOptionInfo &option);
 153         /*! \brief
 154          * Completes default values for file name options.
 155          *
 156          * \param[in] prefix Default prefix for the file name.
 157          * \param[in] option Option for which the value should be completed.
 158          * \returns   Value for the file name option.
 159          * \throws    std::bad_alloc if out of memory.
 160          * \throws    InvalidInputError if the value is not valid for this
 161          *     option.
 162          *
 163          * This method is called for each FileNameOption that has a default
 164          * value (either a standard default value, or if the user provided the
 165          * option without an explicit value).  \p prefix is the default value
 166          * without the default extension for the option.
 167          * If the return value is non-empty, it is used as the default value
 168          * for the option instead of \p prefix + default extension.
 169          */
 170         std::string completeDefaultFileName(const std::string        &prefix,
 171                                             const FileNameOptionInfo &option);
 172
 173     private:
 174         class Impl;
 175
 176         PrivateImplPointer<Impl> impl_;
 177 };
 178
 179 } // namespace gmx
 180
 181 #endif