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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 "optionflags.h"
53 /*! \libinternal \brief
54 * Abstract base class for converting, validating, and storing option values.
56 * This class should normally not be subclassed directly, but the
57 * OptionStorageTemplate should be used instead. The templated class provides
58 * basic functionality for most of the pure virtual methods, and also
59 * integrates well with option setting objects derived from OptionTemplate.
62 * \ingroup module_options
65 * This class really consists of two parts: the public interface that is
66 * used by the internal implementation of the options module, and the
67 * interface that derived classes use to provide type-dependent functionality.
68 * The latter consists of a few pure virtual methods, of which a few simple
69 * query methods are also part of the module-internal interface, others are
70 * protected and called by the non-virtual methods when needed.
71 * The reason why these two roles are in one class is twofold:
72 * -# Both the derived classes and the internal module implementation may need
73 * access to the same information like the allowed number of values and the
75 * -# Having only one class is consistent with the structure used for options
76 * settings objects: there is very direct correspondence between
77 * AbstractOption and AbstractOptionStorage and between OptionTemplate and
78 * OptionStorageTemplate.
80 class AbstractOptionStorage
83 virtual ~AbstractOptionStorage();
85 //! Returns true if the option has been set.
86 bool isSet() const { return hasFlag(efSet); }
88 * Returns true if the option is a boolean option.
90 * This is used to optionally support an alternative syntax where an
91 * option provided with no value sets the value to true and an
92 * option prefixed with "no" clears the value.
94 bool isBoolean() const;
95 //! Returns true if the option is a hidden option.
96 bool isHidden() const { return hasFlag(efHidden); }
97 //! Returns the name of the option.
98 const std::string &name() const { return _name; }
99 //! Returns the description of the option.
100 const std::string &description() const { return _descr; }
103 * Returns an option info object corresponding to this option.
105 virtual OptionInfo &optionInfo() = 0;
107 * Returns a short string describing the type of the option.
109 * The caller is free to discard the returned string.
111 virtual const char *typeString() const = 0;
113 * Returns the number of option values added so far.
115 virtual int valueCount() const = 0;
117 * Returns the i'th value formatted as a string.
119 virtual std::string formatValue(int i) const = 0;
122 * Starts adding values from a new source for the option.
124 * This marks the vurrent value of the option as a default value,
125 * causing next call to startSet() to clear it. This allows values
126 * from the new source to overwrite old values.
128 * This method does not throw.
132 * Starts adding a new set of values for the option.
134 * \throws InvalidInputError if option is specified multiple times,
135 * but is not specified to accept it.
137 * If the parameter is specified multiple times, startSet() should be
138 * called before the values for each instance.
140 * Strong exception safety guarantee.
144 * Adds a new value for the option, converting it from a string.
146 * \param[in] value String value to convert.
147 * \throws InvalidInputError if value cannot be converted, or
148 * if there are too many values.
150 * This method should only be called between startSet() and
153 void appendValue(const std::string &value);
155 * Performs validation and/or actions once a set of values has been
158 * \throws InvalidInputError if too few values have been provided, or
159 * if the valid values since previous startSet() are invalid as a
162 * If the parameter is specified multiple times, finishSet() should be
163 * called after the values for each instance.
167 * Performs validation and/or actions once all values have been added.
169 * \throws InvalidInputError if the option is required but not set, or
170 * if all valid values together are invalid as a set.
172 * This method should be called after all values have been provided
173 * with appendValue().
179 * Initializes the storage object from the settings object.
181 * \param[in] settings Option settings.
182 * \param[in] options Option collection that will contain the
184 * \param[in] staticFlags Option flags that are always set and specify
185 * generic behavior of the option.
186 * \throws APIError if invalid settings have been provided.
188 AbstractOptionStorage(const AbstractOption &settings, Options *options,
189 OptionFlags staticFlags);
191 //! Returns true if the given flag is set.
192 bool hasFlag(OptionFlag flag) const { return _flags.test(flag); }
193 //! Sets the given flag.
194 void setFlag(OptionFlag flag) { return _flags.set(flag); }
195 //! Clears the given flag.
196 void clearFlag(OptionFlag flag) { return _flags.clear(flag); }
198 //! Returns the minimum number of values required in one set.
199 int minValueCount() const { return _minValueCount; }
200 //! Returns the maximum allowed number of values in one set (-1 = no limit).
201 int maxValueCount() const { return _maxValueCount; }
203 * Sets a new minimum number of values required in one set.
205 * \param[in] count New minimum number of values (must be > 0).
206 * \throws InvalidInputError if already provided values violate the limit.
208 * If values have already been provided, it is checked that there are
211 * Cannot be called for options with ::efMulti set, because it is
212 * impossible to check the requirement after the values have been set.
213 * If attempted, will assert.
215 void setMinValueCount(int count);
217 * Sets a new maximum number of values required in one set.
219 * \param[in] count New maximum number of values
220 * (must be > 0, or -1 for no limit).
221 * \throws InvalidInputError if already provided values violate the limit.
223 * If values have already been provided, it is checked that there are
226 * Cannot be called for options with ::efMulti set, because it is
227 * impossible to check the requirement after the values have been set.
228 * If attempted, will assert.
230 void setMaxValueCount(int count);
232 //! Returns the Options object that houses the option.
233 Options &hostOptions() { return *_options; }
234 //! \copydoc hostOptions()
235 const Options &hostOptions() const { return *_options; }
238 * Removes all values from temporary storage for a set.
240 * This function is always called before starting to add values to
241 * a set, allowing the storage to clear its internal buffers.
245 virtual void clearSet() = 0;
247 * Adds a new value, converting it from a string.
249 * \param[in] value String value to convert.
250 * \throws InvalidInputError if \p value is not valid for this option
251 * or if there have been too many values in the set.
253 * This method may be called multiple times if the underlying
254 * option is defined to accept multiple values.
256 * \see OptionStorageTemplate::convertValue()
258 virtual void convertValue(const std::string &value) = 0;
260 * Performs validation and/or actions once a set of values has been
263 * \throws InvalidInputError if the values in the set are not valid
266 * This method may be called multiple times if the underlying option
267 * can be specified multiple times.
269 * \see OptionStorageTemplate::processSetValues()
271 virtual void processSet() = 0;
273 * Performs validation and/or actions once all values have been added.
275 * \throws InvalidInputError if all provided values are not valid as
278 * This method is always called once.
280 * If the method throws, implementation should take care to leave the
281 * option in a consistent, meaningful state. However, currently none
282 * of the implementations actually throw in any situation where the
283 * option may be left in an inconsistent state.
285 virtual void processAll() = 0;
290 //! Flags for the option.
292 //! Minimum number of values required (in one set).
294 //! Maximum allowed number of values (in one set), or -1 if no limit.
296 //! Whether we are currently assigning values to a set.
298 //! Parent Options object.
301 // Disallow copy and assign.
302 AbstractOptionStorage(const AbstractOptionStorage &);
303 void operator =(const AbstractOptionStorage &);