Note: UnicodeFilter currently stubs out two pure virtual methods * of its base class, UnicodeMatcher. These methods are toPattern() * and matchesIndexValue(). This is done so that filter classes that * are not actually used as matchers -- specifically, those in the * UnicodeFilterLogic component, and those in tests -- can continue to * work without defining these methods. As long as a filter is not * used in an RBT during real transliteration, these methods will not * be called. However, this breaks the UnicodeMatcher base class * protocol, and it is not a correct solution. * *

In the future we may revisit the UnicodeMatcher / UnicodeFilter * hierarchy and either redesign it, or simply remove the stubs in * UnicodeFilter and force subclasses to implement the full * UnicodeMatcher protocol. * * @see UnicodeFilterLogic * @stable ICU 2.0 */ class U_COMMON_API UnicodeFilter : public UnicodeFunctor, public UnicodeMatcher { public: /** * Destructor * @stable ICU 2.0 */ virtual ~UnicodeFilter(); /** * Returns true for characters that are in the selected * subset. In other words, if a character is to be * filtered, then contains() returns * false. * @stable ICU 2.0 */ virtual UBool contains(UChar32 c) const = 0; /** * UnicodeFunctor API. Cast 'this' to a UnicodeMatcher* pointer * and return the pointer. * @stable ICU 2.4 */ virtual UnicodeMatcher* toMatcher() const; /** * Implement UnicodeMatcher API. * @stable ICU 2.4 */ virtual UMatchDegree matches(const Replaceable& text, int32_t& offset, int32_t limit, UBool incremental); /** * UnicodeFunctor API. Nothing to do. * @stable ICU 2.4 */ virtual void setData(const TransliterationRuleData*); /** * ICU "poor man's RTTI", returns a UClassID for this class. * * @stable ICU 2.2 */ static UClassID U_EXPORT2 getStaticClassID(); protected: /* * Since this class has pure virtual functions, * a constructor can't be used. * @stable ICU 2.0 */ /* UnicodeFilter();*/ }; /*inline UnicodeFilter::UnicodeFilter() {}*/ U_NAMESPACE_END #endif