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31 /*! \libinternal \file
33 * Declares gmx::AbstractOptionStorage.
35 * \author Teemu Murtola <teemu.murtola@cbr.su.se>
37 * \ingroup module_options
39 #ifndef GMX_OPTIONS_ABSTRACTOPTIONSTORAGE_H
40 #define GMX_OPTIONS_ABSTRACTOPTIONSTORAGE_H
44 #include "../utility/common.h"
46 #include "optionflags.h"
55 /*! \libinternal \brief
56 * Abstract base class for converting, validating, and storing option values.
58 * This class should normally not be subclassed directly, but the
59 * OptionStorageTemplate should be used instead. The templated class provides
60 * basic functionality for most of the pure virtual methods, and also
61 * integrates well with option setting objects derived from OptionTemplate.
64 * \ingroup module_options
67 * This class really consists of two parts: the public interface that is
68 * used by the internal implementation of the options module, and the
69 * interface that derived classes use to provide type-dependent functionality.
70 * The latter consists of a few pure virtual methods, of which a few simple
71 * query methods are also part of the module-internal interface, others are
72 * protected and called by the non-virtual methods when needed.
73 * The reason why these two roles are in one class is twofold:
74 * -# Both the derived classes and the internal module implementation may need
75 * access to the same information like the allowed number of values and the
77 * -# Having only one class is consistent with the structure used for options
78 * settings objects: there is very direct correspondence between
79 * AbstractOption and AbstractOptionStorage and between OptionTemplate and
80 * OptionStorageTemplate.
82 class AbstractOptionStorage
85 virtual ~AbstractOptionStorage();
87 //! Returns true if the option has been set.
88 bool isSet() const { return hasFlag(efSet); }
90 * Returns true if the option is a boolean option.
92 * This is used to optionally support an alternative syntax where an
93 * option provided with no value sets the value to true and an
94 * option prefixed with "no" clears the value.
96 bool isBoolean() const;
97 //! Returns true if the option is a hidden option.
98 bool isHidden() const { return hasFlag(efHidden); }
99 //! Returns the name of the option.
100 const std::string &name() const { return _name; }
101 //! Returns the description of the option.
102 const std::string &description() const { return _descr; }
105 * Returns an option info object corresponding to this option.
107 virtual OptionInfo &optionInfo() = 0;
109 * Returns a short string describing the type of the option.
111 * The caller is free to discard the returned string.
113 virtual const char *typeString() const = 0;
115 * Returns the number of option values added so far.
117 virtual int valueCount() const = 0;
119 * Returns the i'th value formatted as a string.
121 virtual std::string formatValue(int i) const = 0;
124 * Starts adding values from a new source for the option.
126 * This marks the vurrent value of the option as a default value,
127 * causing next call to startSet() to clear it. This allows values
128 * from the new source to overwrite old values.
130 * This method does not throw.
134 * Starts adding a new set of values for the option.
136 * \throws InvalidInputError if option is specified multiple times,
137 * but is not specified to accept it.
139 * If the parameter is specified multiple times, startSet() should be
140 * called before the values for each instance.
142 * Strong exception safety guarantee.
146 * Adds a new value for the option, converting it from a string.
148 * \param[in] value String value to convert.
149 * \throws InvalidInputError if value cannot be converted, or
150 * if there are too many values.
152 * This method should only be called between startSet() and
155 void appendValue(const std::string &value);
157 * Performs validation and/or actions once a set of values has been
160 * \throws InvalidInputError if too few values have been provided, or
161 * if the valid values since previous startSet() are invalid as a
164 * If the parameter is specified multiple times, finishSet() should be
165 * called after the values for each instance.
169 * Performs validation and/or actions once all values have been added.
171 * \throws InvalidInputError if the option is required but not set, or
172 * if all valid values together are invalid as a set.
174 * This method should be called after all values have been provided
175 * with appendValue().
181 * Initializes the storage object from the settings object.
183 * \param[in] settings Option settings.
184 * \param[in] options Option collection that will contain the
186 * \param[in] staticFlags Option flags that are always set and specify
187 * generic behavior of the option.
188 * \throws APIError if invalid settings have been provided.
190 AbstractOptionStorage(const AbstractOption &settings, Options *options,
191 OptionFlags staticFlags);
193 //! Returns true if the given flag is set.
194 bool hasFlag(OptionFlag flag) const { return _flags.test(flag); }
195 //! Sets the given flag.
196 void setFlag(OptionFlag flag) { return _flags.set(flag); }
197 //! Clears the given flag.
198 void clearFlag(OptionFlag flag) { return _flags.clear(flag); }
200 //! Returns the minimum number of values required in one set.
201 int minValueCount() const { return _minValueCount; }
202 //! Returns the maximum allowed number of values in one set (-1 = no limit).
203 int maxValueCount() const { return _maxValueCount; }
205 * Sets a new minimum number of values required in one set.
207 * \param[in] count New minimum number of values (must be > 0).
208 * \throws InvalidInputError if already provided values violate the limit.
210 * If values have already been provided, it is checked that there are
213 * Cannot be called for options with ::efMulti set, because it is
214 * impossible to check the requirement after the values have been set.
215 * If attempted, will assert.
217 void setMinValueCount(int count);
219 * Sets a new maximum number of values required in one set.
221 * \param[in] count New maximum number of values
222 * (must be > 0, or -1 for no limit).
223 * \throws InvalidInputError if already provided values violate the limit.
225 * If values have already been provided, it is checked that there are
228 * Cannot be called for options with ::efMulti set, because it is
229 * impossible to check the requirement after the values have been set.
230 * If attempted, will assert.
232 void setMaxValueCount(int count);
234 //! Returns the Options object that houses the option.
235 Options &hostOptions() { return *_options; }
236 //! \copydoc hostOptions()
237 const Options &hostOptions() const { return *_options; }
240 * Removes all values from temporary storage for a set.
242 * This function is always called before starting to add values to
243 * a set, allowing the storage to clear its internal buffers.
247 virtual void clearSet() = 0;
249 * Adds a new value, converting it from a string.
251 * \param[in] value String value to convert.
252 * \throws InvalidInputError if \p value is not valid for this option
253 * or if there have been too many values in the set.
255 * This method may be called multiple times if the underlying
256 * option is defined to accept multiple values.
258 * \see OptionStorageTemplate::convertValue()
260 virtual void convertValue(const std::string &value) = 0;
262 * Performs validation and/or actions once a set of values has been
265 * \throws InvalidInputError if the values in the set are not valid
268 * This method may be called multiple times if the underlying option
269 * can be specified multiple times.
271 * \see OptionStorageTemplate::processSetValues()
273 virtual void processSet() = 0;
275 * Performs validation and/or actions once all values have been added.
277 * \throws InvalidInputError if all provided values are not valid as
280 * This method is always called once.
282 * If the method throws, implementation should take care to leave the
283 * option in a consistent, meaningful state. However, currently none
284 * of the implementations actually throw in any situation where the
285 * option may be left in an inconsistent state.
287 virtual void processAll() = 0;
292 //! Flags for the option.
294 //! Minimum number of values required (in one set).
296 //! Maximum allowed number of values (in one set), or -1 if no limit.
298 //! Whether we are currently assigning values to a set.
300 //! Parent Options object.
303 GMX_DISALLOW_COPY_AND_ASSIGN(AbstractOptionStorage);