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35 /*! \libinternal \file
37 * Declares gmx::AbstractOptionStorage.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_options
43 #ifndef GMX_OPTIONS_ABSTRACTOPTIONSTORAGE_H
44 #define GMX_OPTIONS_ABSTRACTOPTIONSTORAGE_H
48 #include "../utility/common.h"
50 #include "optionflags.h"
59 /*! \libinternal \brief
60 * Abstract base class for converting, validating, and storing option values.
62 * This class should normally not be subclassed directly, but the
63 * OptionStorageTemplate should be used instead. The templated class provides
64 * basic functionality for most of the pure virtual methods, and also
65 * integrates well with option setting objects derived from OptionTemplate.
68 * \ingroup module_options
71 * This class really consists of two parts: the public interface that is
72 * used by the internal implementation of the options module, and the
73 * interface that derived classes use to provide type-dependent functionality.
74 * The latter consists of a few pure virtual methods, of which a few simple
75 * query methods are also part of the module-internal interface, others are
76 * protected and called by the non-virtual methods when needed.
77 * The reason why these two roles are in one class is twofold:
78 * -# Both the derived classes and the internal module implementation may need
79 * access to the same information like the allowed number of values and the
81 * -# Having only one class is consistent with the structure used for options
82 * settings objects: there is very direct correspondence between
83 * AbstractOption and AbstractOptionStorage and between OptionTemplate and
84 * OptionStorageTemplate.
86 class AbstractOptionStorage
89 virtual ~AbstractOptionStorage();
91 //! Returns true if the option has been set.
92 bool isSet() const { return hasFlag(efOption_Set); }
94 * Returns true if the option is a boolean option.
96 * This is used to optionally support an alternative syntax where an
97 * option provided with no value sets the value to true and an
98 * option prefixed with "no" clears the value.
100 bool isBoolean() const;
101 //! Returns true if the option is a hidden option.
102 bool isHidden() const { return hasFlag(efOption_Hidden); }
103 //! Returns true if the option is required.
104 bool isRequired() const { return hasFlag(efOption_Required); }
105 //! Returns true if the option is vector-valued.
106 bool isVector() const { return hasFlag(efOption_Vector); }
107 //! Returns the name of the option.
108 const std::string &name() const { return name_; }
109 //! Returns the description of the option.
110 const std::string &description() const { return descr_; }
113 * Returns an option info object corresponding to this option.
115 virtual OptionInfo &optionInfo() = 0;
117 * Returns a short string describing the type of the option.
119 * The caller is free to discard the returned string.
121 virtual const char *typeString() const = 0;
123 * Returns the number of option values added so far.
125 virtual int valueCount() const = 0;
127 * Returns the i'th value formatted as a string.
129 * If \p i is DefaultValueIfSetIndex, should format the default value
130 * if set (see OptionTemplate::defaultValueIfSet()).
132 virtual std::string formatValue(int i) const = 0;
133 //! \copydoc OptionInfo::formatDefaultValueIfSet()
134 std::string formatDefaultValueIfSet() const
135 { return formatValue(DefaultValueIfSetIndex); }
138 * Starts adding values from a new source for the option.
140 * This marks the vurrent value of the option as a default value,
141 * causing next call to startSet() to clear it. This allows values
142 * from the new source to overwrite old values.
144 * This method does not throw.
148 * Starts adding a new set of values for the option.
150 * \throws InvalidInputError if option is specified multiple times,
151 * but is not specified to accept it.
153 * If the parameter is specified multiple times, startSet() should be
154 * called before the values for each instance.
156 * Strong exception safety guarantee.
160 * Adds a new value for the option, converting it from a string.
162 * \param[in] value String value to convert.
163 * \throws InvalidInputError if value cannot be converted, or
164 * if there are too many values.
166 * This method should only be called between startSet() and
169 void appendValue(const std::string &value);
171 * Performs validation and/or actions once a set of values has been
174 * \throws InvalidInputError if too few values have been provided, or
175 * if the valid values since previous startSet() are invalid as a
178 * If the parameter is specified multiple times, finishSet() should be
179 * called after the values for each instance.
183 * Performs validation and/or actions once all values have been added.
185 * \throws InvalidInputError if the option is required but not set, or
186 * if all valid values together are invalid as a set.
188 * This method should be called after all values have been provided
189 * with appendValue().
194 //! Index used with formatValue() for formatting default value if set.
195 static const int DefaultValueIfSetIndex = -1;
198 * Initializes the storage object from the settings object.
200 * \param[in] settings Option settings.
201 * \param[in] staticFlags Option flags that are always set and specify
202 * generic behavior of the option.
203 * \throws APIError if invalid settings have been provided.
205 AbstractOptionStorage(const AbstractOption &settings,
206 OptionFlags staticFlags);
208 //! Marks the option as set.
209 void markAsSet() { flags_.set(efOption_Set); }
210 //! Returns true if the given flag is set.
211 bool hasFlag(OptionFlag flag) const { return flags_.test(flag); }
212 //! Sets the given flag.
213 void setFlag(OptionFlag flag) { return flags_.set(flag); }
214 //! Clears the given flag.
215 void clearFlag(OptionFlag flag) { return flags_.clear(flag); }
217 //! Returns the minimum number of values required in one set.
218 int minValueCount() const { return minValueCount_; }
219 //! Returns the maximum allowed number of values in one set (-1 = no limit).
220 int maxValueCount() const { return maxValueCount_; }
222 * Sets a new minimum number of values required in one set.
224 * \param[in] count New minimum number of values (must be > 0).
225 * \throws InvalidInputError if already provided values violate the limit.
227 * If values have already been provided, it is checked that there are
230 * Cannot be called for options with ::efOption_MultipleTimes set,
231 * because it is impossible to check the requirement after the values
233 * If attempted, will assert.
235 void setMinValueCount(int count);
237 * Sets a new maximum number of values required in one set.
239 * \param[in] count New maximum number of values
240 * (must be > 0, or -1 for no limit).
241 * \throws InvalidInputError if already provided values violate the limit.
243 * If values have already been provided, it is checked that there are
246 * Cannot be called for options with ::efOption_MultipleTimes set,
247 * because it is impossible to check the requirement after the values
249 * If attempted, will assert.
251 void setMaxValueCount(int count);
254 * Removes all values from temporary storage for a set.
256 * This function is always called before starting to add values to
257 * a set, allowing the storage to clear its internal buffers.
261 virtual void clearSet() = 0;
263 * Adds a new value, converting it from a string.
265 * \param[in] value String value to convert.
266 * \throws InvalidInputError if \p value is not valid for this option
267 * or if there have been too many values in the set.
269 * This method may be called multiple times if the underlying
270 * option is defined to accept multiple values.
272 * \see OptionStorageTemplate::convertValue()
274 virtual void convertValue(const std::string &value) = 0;
276 * Performs validation and/or actions once a set of values has been
279 * \throws InvalidInputError if the values in the set are not valid
282 * This method may be called multiple times if the underlying option
283 * can be specified multiple times.
284 * This method is not currently called if one of the convertValue()
288 * Improve the call semantics.
290 * \see OptionStorageTemplate::processSetValues()
292 virtual void processSet() = 0;
294 * Performs validation and/or actions once all values have been added.
296 * \throws InvalidInputError if all provided values are not valid as
299 * This method is always called once.
301 * If the method throws, implementation should take care to leave the
302 * option in a consistent, meaningful state. However, currently none
303 * of the implementations actually throw in any situation where the
304 * option may be left in an inconsistent state.
306 virtual void processAll() = 0;
311 //! Flags for the option.
313 //! Minimum number of values required (in one set).
315 //! Maximum allowed number of values (in one set), or -1 if no limit.
317 //! Whether we are currently assigning values to a set.
319 //! Whether there were errors in set values.
320 bool bSetValuesHadErrors_;
322 GMX_DISALLOW_COPY_AND_ASSIGN(AbstractOptionStorage);