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36 /*! \libinternal \file
38 * Declares gmx::AbstractOptionStorage.
40 * \author Teemu Murtola <teemu.murtola@gmail.com>
42 * \ingroup module_options
44 #ifndef GMX_OPTIONS_ABSTRACTOPTIONSTORAGE_H
45 #define GMX_OPTIONS_ABSTRACTOPTIONSTORAGE_H
51 #include "gromacs/utility/classhelpers.h"
53 #include "optionflags.h"
63 /*! \libinternal \brief
64 * Abstract base class for converting, validating, and storing option values.
66 * This class should normally not be subclassed directly, but the
67 * OptionStorageTemplate should be used instead. The templated class provides
68 * basic functionality for most of the pure virtual methods, and also
69 * integrates well with option setting objects derived from OptionTemplate.
72 * \ingroup module_options
75 * This class really consists of two parts: the public interface that is
76 * used by the internal implementation of the options module, and the
77 * interface that derived classes use to provide type-dependent functionality.
78 * The latter consists of a few pure virtual methods, of which a few simple
79 * query methods are also part of the module-internal interface, others are
80 * protected and called by the non-virtual methods when needed.
81 * The reason why these two roles are in one class is twofold:
82 * -# Both the derived classes and the internal module implementation may need
83 * access to the same information like the allowed number of values and the
85 * -# Having only one class is consistent with the structure used for options
86 * settings objects: there is very direct correspondence between
87 * AbstractOption and AbstractOptionStorage and between OptionTemplate and
88 * OptionStorageTemplate.
90 class AbstractOptionStorage
93 virtual ~AbstractOptionStorage();
95 //! Returns true if the option has been set.
96 bool isSet() const { return hasFlag(efOption_Set); }
98 * Returns true if the option is a boolean option.
100 * This is used to optionally support an alternative syntax where an
101 * option provided with no value sets the value to true and an
102 * option prefixed with "no" clears the value.
104 bool isBoolean() const;
105 //! Returns true if the option is a hidden option.
106 bool isHidden() const { return hasFlag(efOption_Hidden); }
107 //! Returns true if the option is required.
108 bool isRequired() const { return hasFlag(efOption_Required); }
109 //! Returns true if the option is vector-valued.
110 bool isVector() const { return hasFlag(efOption_Vector); }
111 //! Returns the name of the option.
112 const std::string& name() const { return name_; }
113 //! Returns the description of the option set by the calling code.
114 const std::string& description() const { return descr_; }
116 //! Returns true if defaultValueIfSet() value is specified.
117 bool defaultValueIfSetExists() const { return hasFlag(efOption_DefaultValueIfSetExists); }
118 //! Returns the minimum number of values required in one set.
119 int minValueCount() const { return minValueCount_; }
120 //! Returns the maximum allowed number of values in one set (-1 = no limit).
121 int maxValueCount() const { return maxValueCount_; }
124 * Returns an option info object corresponding to this option.
126 virtual OptionInfo& optionInfo() = 0;
128 * Returns a short string describing the type of the option.
130 virtual std::string typeString() const = 0;
132 * Formats additional description for the option.
134 * If this method returns a non-empty string, it is appended to the
135 * plain description when printing help texts.
136 * The default implementation returns an empty string.
138 virtual std::string formatExtraDescription() const { return std::string(); }
140 * Returns the number of option values added so far.
142 virtual int valueCount() const = 0;
143 //! \copydoc OptionInfo::defaultValues()
144 virtual std::vector<Any> defaultValues() const = 0;
145 //! \copydoc OptionInfo::defaultValuesAsStrings()
146 virtual std::vector<std::string> defaultValuesAsStrings() const = 0;
147 //! \copydoc OptionInfo::normalizeValues()
148 virtual std::vector<Any> normalizeValues(const std::vector<Any>& values) const = 0;
151 * Starts adding values from a new source for the option.
153 * This marks the vurrent value of the option as a default value,
154 * causing next call to startSet() to clear it. This allows values
155 * from the new source to overwrite old values.
157 * This method does not throw.
161 * Starts adding a new set of values for the option.
163 * \throws InvalidInputError if option is specified multiple times,
164 * but is not specified to accept it.
166 * If the parameter is specified multiple times, startSet() should be
167 * called before the values for each instance.
169 * Strong exception safety guarantee.
173 * Adds a new value for the option.
175 * \param[in] value Value to convert.
176 * \throws InvalidInputError if value cannot be converted, or
177 * if there are too many values.
179 * This method should only be called between startSet() and
182 void appendValue(const Any& value);
184 * Performs validation and/or actions once a set of values has been
187 * \throws InvalidInputError if too few values have been provided, or
188 * if the valid values since previous startSet() are invalid as a
191 * If the parameter is specified multiple times, finishSet() should be
192 * called after the values for each instance.
196 * Performs validation and/or actions once all values have been added.
198 * \throws InvalidInputError if the option is required but not set, or
199 * if all valid values together are invalid as a set.
201 * This method should be called after all values have been provided
202 * with appendValue().
208 * Initializes the storage object from the settings object.
210 * \param[in] settings Option settings.
211 * \param[in] staticFlags Option flags that are always set and specify
212 * generic behavior of the option.
213 * \throws APIError if invalid settings have been provided.
215 AbstractOptionStorage(const AbstractOption& settings, OptionFlags staticFlags);
217 //! Marks the option as set.
219 //! Returns true if the given flag is set.
220 bool hasFlag(OptionFlag flag) const { return flags_.test(flag); }
221 //! Sets the given flag.
222 void setFlag(OptionFlag flag) { return flags_.set(flag); }
223 //! Clears the given flag.
224 void clearFlag(OptionFlag flag) { return flags_.clear(flag); }
227 * Sets a new minimum number of values required in one set.
229 * \param[in] count New minimum number of values (must be > 0).
230 * \throws InvalidInputError if already provided values violate the limit.
232 * If values have already been provided, it is checked that there are
235 * Cannot be called for options with ::efOption_MultipleTimes set,
236 * because it is impossible to check the requirement after the values
238 * If attempted, will assert.
240 void setMinValueCount(int count);
242 * Sets a new maximum number of values required in one set.
244 * \param[in] count New maximum number of values
245 * (must be > 0, or -1 for no limit).
246 * \throws InvalidInputError if already provided values violate the limit.
248 * If values have already been provided, it is checked that there are
251 * Cannot be called for options with ::efOption_MultipleTimes set,
252 * because it is impossible to check the requirement after the values
254 * If attempted, will assert.
256 void setMaxValueCount(int count);
259 * Removes all values from temporary storage for a set.
261 * This function is always called before starting to add values to
262 * a set, allowing the storage to clear its internal buffers.
266 virtual void clearSet() = 0;
270 * \param[in] value Value to convert.
271 * \throws InvalidInputError if \p value is not valid for this option
272 * or if there have been too many values in the set.
274 * This method may be called multiple times if the underlying
275 * option is defined to accept multiple values.
277 * \see OptionStorageTemplate::convertValue()
279 virtual void convertValue(const Any& value) = 0;
281 * Performs validation and/or actions once a set of values has been
284 * \throws InvalidInputError if the values in the set are not valid
287 * This method may be called multiple times if the underlying option
288 * can be specified multiple times.
289 * This method is not currently called if one of the convertValue()
293 * Improve the call semantics.
295 * \see OptionStorageTemplate::processSetValues()
297 virtual void processSet() = 0;
299 * Performs validation and/or actions once all values have been added.
301 * \throws InvalidInputError if all provided values are not valid as
304 * This method is always called once.
306 * If the method throws, implementation should take care to leave the
307 * option in a consistent, meaningful state. However, currently none
308 * of the implementations actually throw in any situation where the
309 * option may be left in an inconsistent state.
311 virtual void processAll() = 0;
316 //! Flags for the option.
319 //! Minimum number of values required (in one set).
321 //! Maximum allowed number of values (in one set), or -1 if no limit.
323 //! Whether we are currently assigning values to a set.
325 //! Whether there were errors in set values.
326 bool bSetValuesHadErrors_;
328 GMX_DISALLOW_COPY_AND_ASSIGN(AbstractOptionStorage);