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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 "gromacs/options/optionflags.h"
49 #include "gromacs/utility/common.h"
58 /*! \libinternal \brief
59 * Abstract base class for converting, validating, and storing option values.
61 * This class should normally not be subclassed directly, but the
62 * OptionStorageTemplate should be used instead. The templated class provides
63 * basic functionality for most of the pure virtual methods, and also
64 * integrates well with option setting objects derived from OptionTemplate.
67 * \ingroup module_options
70 * This class really consists of two parts: the public interface that is
71 * used by the internal implementation of the options module, and the
72 * interface that derived classes use to provide type-dependent functionality.
73 * The latter consists of a few pure virtual methods, of which a few simple
74 * query methods are also part of the module-internal interface, others are
75 * protected and called by the non-virtual methods when needed.
76 * The reason why these two roles are in one class is twofold:
77 * -# Both the derived classes and the internal module implementation may need
78 * access to the same information like the allowed number of values and the
80 * -# Having only one class is consistent with the structure used for options
81 * settings objects: there is very direct correspondence between
82 * AbstractOption and AbstractOptionStorage and between OptionTemplate and
83 * OptionStorageTemplate.
85 class AbstractOptionStorage
88 virtual ~AbstractOptionStorage();
90 //! Returns true if the option has been set.
91 bool isSet() const { return hasFlag(efOption_Set); }
93 * Returns true if the option is a boolean option.
95 * This is used to optionally support an alternative syntax where an
96 * option provided with no value sets the value to true and an
97 * option prefixed with "no" clears the value.
99 bool isBoolean() const;
100 //! Returns true if the option is a hidden option.
101 bool isHidden() const { return hasFlag(efOption_Hidden); }
102 //! Returns true if the option is required.
103 bool isRequired() const { return hasFlag(efOption_Required); }
104 //! Returns true if the option is vector-valued.
105 bool isVector() const { return hasFlag(efOption_Vector); }
106 //! Returns the name of the option.
107 const std::string &name() const { return name_; }
108 //! Returns the description of the option set by the calling code.
109 const std::string &description() const { return descr_; }
111 //! Returns true if defaultValueIfSet() value is specified.
112 bool defaultValueIfSetExists() const
113 { return hasFlag(efOption_DefaultValueIfSetExists); }
114 //! Returns the minimum number of values required in one set.
115 int minValueCount() const { return minValueCount_; }
116 //! Returns the maximum allowed number of values in one set (-1 = no limit).
117 int maxValueCount() const { return maxValueCount_; }
120 * Returns an option info object corresponding to this option.
122 virtual OptionInfo &optionInfo() = 0;
124 * Returns a short string describing the type of the option.
126 virtual std::string typeString() const = 0;
128 * Formats additional description for the option.
130 * If this method returns a non-empty string, it is appended to the
131 * plain description when printing help texts.
132 * The default implementation returns an empty string.
134 virtual std::string formatExtraDescription() const
135 { return std::string(); }
137 * Returns the number of option values added so far.
139 virtual int valueCount() const = 0;
141 * Returns the i'th value formatted as a string.
143 * If \p i is DefaultValueIfSetIndex, should format the default value
144 * if set (see OptionTemplate::defaultValueIfSet()).
146 virtual std::string formatValue(int i) const = 0;
147 //! \copydoc OptionInfo::formatDefaultValueIfSet()
148 std::string formatDefaultValueIfSet() const
149 { return formatValue(DefaultValueIfSetIndex); }
152 * Starts adding values from a new source for the option.
154 * This marks the vurrent value of the option as a default value,
155 * causing next call to startSet() to clear it. This allows values
156 * from the new source to overwrite old values.
158 * This method does not throw.
162 * Starts adding a new set of values for the option.
164 * \throws InvalidInputError if option is specified multiple times,
165 * but is not specified to accept it.
167 * If the parameter is specified multiple times, startSet() should be
168 * called before the values for each instance.
170 * Strong exception safety guarantee.
174 * Adds a new value for the option, converting it from a string.
176 * \param[in] value String value to convert.
177 * \throws InvalidInputError if value cannot be converted, or
178 * if there are too many values.
180 * This method should only be called between startSet() and
183 void appendValue(const std::string &value);
185 * Performs validation and/or actions once a set of values has been
188 * \throws InvalidInputError if too few values have been provided, or
189 * if the valid values since previous startSet() are invalid as a
192 * If the parameter is specified multiple times, finishSet() should be
193 * called after the values for each instance.
197 * Performs validation and/or actions once all values have been added.
199 * \throws InvalidInputError if the option is required but not set, or
200 * if all valid values together are invalid as a set.
202 * This method should be called after all values have been provided
203 * with appendValue().
208 //! Index used with formatValue() for formatting default value if set.
209 static const int DefaultValueIfSetIndex = -1;
212 * Initializes the storage object from the settings object.
214 * \param[in] settings Option settings.
215 * \param[in] staticFlags Option flags that are always set and specify
216 * generic behavior of the option.
217 * \throws APIError if invalid settings have been provided.
219 AbstractOptionStorage(const AbstractOption &settings,
220 OptionFlags staticFlags);
222 //! Marks the option as set.
223 void markAsSet() { flags_.set(efOption_Set); }
224 //! Returns true if the given flag is set.
225 bool hasFlag(OptionFlag flag) const { return flags_.test(flag); }
226 //! Sets the given flag.
227 void setFlag(OptionFlag flag) { return flags_.set(flag); }
228 //! Clears the given flag.
229 void clearFlag(OptionFlag flag) { return flags_.clear(flag); }
232 * Sets a new minimum number of values required in one set.
234 * \param[in] count New minimum number of values (must be > 0).
235 * \throws InvalidInputError if already provided values violate the limit.
237 * If values have already been provided, it is checked that there are
240 * Cannot be called for options with ::efOption_MultipleTimes set,
241 * because it is impossible to check the requirement after the values
243 * If attempted, will assert.
245 void setMinValueCount(int count);
247 * Sets a new maximum number of values required in one set.
249 * \param[in] count New maximum number of values
250 * (must be > 0, or -1 for no limit).
251 * \throws InvalidInputError if already provided values violate the limit.
253 * If values have already been provided, it is checked that there are
256 * Cannot be called for options with ::efOption_MultipleTimes set,
257 * because it is impossible to check the requirement after the values
259 * If attempted, will assert.
261 void setMaxValueCount(int count);
264 * Removes all values from temporary storage for a set.
266 * This function is always called before starting to add values to
267 * a set, allowing the storage to clear its internal buffers.
271 virtual void clearSet() = 0;
273 * Adds a new value, converting it from a string.
275 * \param[in] value String value to convert.
276 * \throws InvalidInputError if \p value is not valid for this option
277 * or if there have been too many values in the set.
279 * This method may be called multiple times if the underlying
280 * option is defined to accept multiple values.
282 * \see OptionStorageTemplate::convertValue()
284 virtual void convertValue(const std::string &value) = 0;
286 * Performs validation and/or actions once a set of values has been
289 * \throws InvalidInputError if the values in the set are not valid
292 * This method may be called multiple times if the underlying option
293 * can be specified multiple times.
294 * This method is not currently called if one of the convertValue()
298 * Improve the call semantics.
300 * \see OptionStorageTemplate::processSetValues()
302 virtual void processSet() = 0;
304 * Performs validation and/or actions once all values have been added.
306 * \throws InvalidInputError if all provided values are not valid as
309 * This method is always called once.
311 * If the method throws, implementation should take care to leave the
312 * option in a consistent, meaningful state. However, currently none
313 * of the implementations actually throw in any situation where the
314 * option may be left in an inconsistent state.
316 virtual void processAll() = 0;
321 //! Flags for the option.
323 //! Minimum number of values required (in one set).
325 //! Maximum allowed number of values (in one set), or -1 if no limit.
327 //! Whether we are currently assigning values to a set.
329 //! Whether there were errors in set values.
330 bool bSetValuesHadErrors_;
332 GMX_DISALLOW_COPY_AND_ASSIGN(AbstractOptionStorage);