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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 set by the calling code.
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 virtual std::string typeString() const = 0;
121 * Formats additional description for the option.
123 * If this method returns a non-empty string, it is appended to the
124 * plain description when printing help texts.
125 * The default implementation returns an empty string.
127 virtual std::string formatExtraDescription() const
128 { return std::string(); }
130 * Returns the number of option values added so far.
132 virtual int valueCount() const = 0;
134 * Returns the i'th value formatted as a string.
136 * If \p i is DefaultValueIfSetIndex, should format the default value
137 * if set (see OptionTemplate::defaultValueIfSet()).
139 virtual std::string formatValue(int i) const = 0;
140 //! \copydoc OptionInfo::formatDefaultValueIfSet()
141 std::string formatDefaultValueIfSet() const
142 { return formatValue(DefaultValueIfSetIndex); }
145 * Starts adding values from a new source for the option.
147 * This marks the vurrent value of the option as a default value,
148 * causing next call to startSet() to clear it. This allows values
149 * from the new source to overwrite old values.
151 * This method does not throw.
155 * Starts adding a new set of values for the option.
157 * \throws InvalidInputError if option is specified multiple times,
158 * but is not specified to accept it.
160 * If the parameter is specified multiple times, startSet() should be
161 * called before the values for each instance.
163 * Strong exception safety guarantee.
167 * Adds a new value for the option, converting it from a string.
169 * \param[in] value String value to convert.
170 * \throws InvalidInputError if value cannot be converted, or
171 * if there are too many values.
173 * This method should only be called between startSet() and
176 void appendValue(const std::string &value);
178 * Performs validation and/or actions once a set of values has been
181 * \throws InvalidInputError if too few values have been provided, or
182 * if the valid values since previous startSet() are invalid as a
185 * If the parameter is specified multiple times, finishSet() should be
186 * called after the values for each instance.
190 * Performs validation and/or actions once all values have been added.
192 * \throws InvalidInputError if the option is required but not set, or
193 * if all valid values together are invalid as a set.
195 * This method should be called after all values have been provided
196 * with appendValue().
201 //! Index used with formatValue() for formatting default value if set.
202 static const int DefaultValueIfSetIndex = -1;
205 * Initializes the storage object from the settings object.
207 * \param[in] settings Option settings.
208 * \param[in] staticFlags Option flags that are always set and specify
209 * generic behavior of the option.
210 * \throws APIError if invalid settings have been provided.
212 AbstractOptionStorage(const AbstractOption &settings,
213 OptionFlags staticFlags);
215 //! Marks the option as set.
216 void markAsSet() { flags_.set(efOption_Set); }
217 //! Returns true if the given flag is set.
218 bool hasFlag(OptionFlag flag) const { return flags_.test(flag); }
219 //! Sets the given flag.
220 void setFlag(OptionFlag flag) { return flags_.set(flag); }
221 //! Clears the given flag.
222 void clearFlag(OptionFlag flag) { return flags_.clear(flag); }
224 //! Returns the minimum number of values required in one set.
225 int minValueCount() const { return minValueCount_; }
226 //! Returns the maximum allowed number of values in one set (-1 = no limit).
227 int maxValueCount() const { return maxValueCount_; }
229 * Sets a new minimum number of values required in one set.
231 * \param[in] count New minimum number of values (must be > 0).
232 * \throws InvalidInputError if already provided values violate the limit.
234 * If values have already been provided, it is checked that there are
237 * Cannot be called for options with ::efOption_MultipleTimes set,
238 * because it is impossible to check the requirement after the values
240 * If attempted, will assert.
242 void setMinValueCount(int count);
244 * Sets a new maximum number of values required in one set.
246 * \param[in] count New maximum number of values
247 * (must be > 0, or -1 for no limit).
248 * \throws InvalidInputError if already provided values violate the limit.
250 * If values have already been provided, it is checked that there are
253 * Cannot be called for options with ::efOption_MultipleTimes set,
254 * because it is impossible to check the requirement after the values
256 * If attempted, will assert.
258 void setMaxValueCount(int count);
261 * Removes all values from temporary storage for a set.
263 * This function is always called before starting to add values to
264 * a set, allowing the storage to clear its internal buffers.
268 virtual void clearSet() = 0;
270 * Adds a new value, converting it from a string.
272 * \param[in] value String value to convert.
273 * \throws InvalidInputError if \p value is not valid for this option
274 * or if there have been too many values in the set.
276 * This method may be called multiple times if the underlying
277 * option is defined to accept multiple values.
279 * \see OptionStorageTemplate::convertValue()
281 virtual void convertValue(const std::string &value) = 0;
283 * Performs validation and/or actions once a set of values has been
286 * \throws InvalidInputError if the values in the set are not valid
289 * This method may be called multiple times if the underlying option
290 * can be specified multiple times.
291 * This method is not currently called if one of the convertValue()
295 * Improve the call semantics.
297 * \see OptionStorageTemplate::processSetValues()
299 virtual void processSet() = 0;
301 * Performs validation and/or actions once all values have been added.
303 * \throws InvalidInputError if all provided values are not valid as
306 * This method is always called once.
308 * If the method throws, implementation should take care to leave the
309 * option in a consistent, meaningful state. However, currently none
310 * of the implementations actually throw in any situation where the
311 * option may be left in an inconsistent state.
313 virtual void processAll() = 0;
318 //! Flags for the option.
320 //! Minimum number of values required (in one set).
322 //! Maximum allowed number of values (in one set), or -1 if no limit.
324 //! Whether we are currently assigning values to a set.
326 //! Whether there were errors in set values.
327 bool bSetValuesHadErrors_;
329 GMX_DISALLOW_COPY_AND_ASSIGN(AbstractOptionStorage);