/usr/include/unicode/fmtable.h (18794B)
Internally, a Formattable object is a union of primitive types. * As such, it can only store one flavor of data at a time. To * determine what flavor of data it contains, use the getType method. * *
As of ICU 3.0, Formattable may also wrap a UObject pointer, * which it owns. This allows an instance of any ICU class to be * encapsulated in a Formattable. For legacy reasons and for * efficiency, primitive numeric types are still stored directly * within a Formattable. * *
The Formattable class is not suitable for subclassing. */ class U_I18N_API Formattable : public UObject { public: /** * This enum is only used to let callers distinguish between * the Formattable(UDate) constructor and the Formattable(double) * constructor; the compiler cannot distinguish the signatures, * since UDate is currently typedefed to be either double or long. * If UDate is changed later to be a bonafide class * or struct, then we no longer need this enum. * @stable ICU 2.4 */ enum ISDATE { kIsDate }; /** * Default constructor * @stable ICU 2.4 */ Formattable(); // Type kLong, value 0 /** * Creates a Formattable object with a UDate instance. * @param d the UDate instance. * @param flag the flag to indicate this is a date. Always set it to kIsDate * @stable ICU 2.0 */ Formattable(UDate d, ISDATE flag); /** * Creates a Formattable object with a double number. * @param d the double number. * @stable ICU 2.0 */ Formattable(double d); /** * Creates a Formattable object with a long number. * @param l the long number. * @stable ICU 2.0 */ Formattable(int32_t l); /** * Creates a Formattable object with an int64_t number * @param ll the int64_t number. * @stable ICU 2.8 */ Formattable(int64_t ll); #if !UCONFIG_NO_CONVERSION /** * Creates a Formattable object with a char string pointer. * Assumes that the char string is null terminated. * @param strToCopy the char string. * @stable ICU 2.0 */ Formattable(const char* strToCopy); #endif /** * Creates a Formattable object with a UnicodeString object to copy from. * @param strToCopy the UnicodeString string. * @stable ICU 2.0 */ Formattable(const UnicodeString& strToCopy); /** * Creates a Formattable object with a UnicodeString object to adopt from. * @param strToAdopt the UnicodeString string. * @stable ICU 2.0 */ Formattable(UnicodeString* strToAdopt); /** * Creates a Formattable object with an array of Formattable objects. * @param arrayToCopy the Formattable object array. * @param count the array count. * @stable ICU 2.0 */ Formattable(const Formattable* arrayToCopy, int32_t count); /** * Creates a Formattable object that adopts the given UObject. * @param objectToAdopt the UObject to set this object to * @stable ICU 3.0 */ Formattable(UObject* objectToAdopt); /** * Copy constructor. * @stable ICU 2.0 */ Formattable(const Formattable&); /** * Assignment operator. * @param rhs The Formattable object to copy into this object. * @stable ICU 2.0 */ Formattable& operator=(const Formattable &rhs); /** * Equality comparison. * @param other the object to be compared with. * @return TRUE if other are equal to this, FALSE otherwise. * @stable ICU 2.0 */ UBool operator==(const Formattable &other) const; /** * Equality operator. * @param other the object to be compared with. * @return TRUE if other are unequal to this, FALSE otherwise. * @stable ICU 2.0 */ UBool operator!=(const Formattable& other) const { return !operator==(other); } /** * Destructor. * @stable ICU 2.0 */ virtual ~Formattable(); /** * Clone this object. * Clones can be used concurrently in multiple threads. * If an error occurs, then NULL is returned. * The caller must delete the clone. * * @return a clone of this object * * @see getDynamicClassID * @stable ICU 2.8 */ Formattable *clone() const; /** * Selector for flavor of data type contained within a * Formattable object. Formattable is a union of several * different types, and at any time contains exactly one type. * @stable ICU 2.4 */ enum Type { /** * Selector indicating a UDate value. Use getDate to retrieve * the value. * @stable ICU 2.4 */ kDate, /** * Selector indicating a double value. Use getDouble to * retrieve the value. * @stable ICU 2.4 */ kDouble, /** * Selector indicating a 32-bit integer value. Use getLong to * retrieve the value. * @stable ICU 2.4 */ kLong, /** * Selector indicating a UnicodeString value. Use getString * to retrieve the value. * @stable ICU 2.4 */ kString, /** * Selector indicating an array of Formattables. Use getArray * to retrieve the value. * @stable ICU 2.4 */ kArray, /** * Selector indicating a 64-bit integer value. Use getInt64 * to retrieve the value. * @stable ICU 2.8 */ kInt64, /** * Selector indicating a UObject value. Use getObject to * retrieve the value. * @stable ICU 3.0 */ kObject }; /** * Gets the data type of this Formattable object. * @return the data type of this Formattable object. * @stable ICU 2.0 */ Type getType(void) const; /** * Returns TRUE if the data type of this Formattable object * is kDouble, kLong, or kInt64. * @return TRUE if this is a pure numeric object * @stable ICU 3.0 */ UBool isNumeric() const; /** * Gets the double value of this object. If this object is not of type * kDouble then the result is undefined. * @return the double value of this object. * @stable ICU 2.0 */ double getDouble(void) const { return fValue.fDouble; } /** * Gets the double value of this object. If this object is of type * long or int64 then a casting conversion is peformed, with * possible loss of precision. If the type is kObject and the * object is a Measure, then the result of * getNumber().getDouble(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param status the error code * @return the double value of this object. * @stable ICU 3.0 */ double getDouble(UErrorCode& status) const; /** * Gets the long value of this object. If this object is not of type * kLong then the result is undefined. * @return the long value of this object. * @stable ICU 2.0 */ int32_t getLong(void) const { return (int32_t)fValue.fInt64; } /** * Gets the long value of this object. If the magnitude is too * large to fit in a long, then the maximum or minimum long value, * as appropriate, is returned and the status is set to * U_INVALID_FORMAT_ERROR. If this object is of type kInt64 and * it fits within a long, then no precision is lost. If it is of * type kDouble, then a casting conversion is peformed, with * truncation of any fractional part. If the type is kObject and * the object is a Measure, then the result of * getNumber().getLong(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param status the error code * @return the long value of this object. * @stable ICU 3.0 */ int32_t getLong(UErrorCode& status) const; /** * Gets the int64 value of this object. If this object is not of type * kInt64 then the result is undefined. * @return the int64 value of this object. * @stable ICU 2.8 */ int64_t getInt64(void) const { return fValue.fInt64; } /** * Gets the int64 value of this object. If this object is of type * kDouble and the magnitude is too large to fit in an int64, then * the maximum or minimum int64 value, as appropriate, is returned * and the status is set to U_INVALID_FORMAT_ERROR. If the * magnitude fits in an int64, then a casting conversion is * peformed, with truncation of any fractional part. If the type * is kObject and the object is a Measure, then the result of * getNumber().getDouble(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param status the error code * @return the int64 value of this object. * @stable ICU 3.0 */ int64_t getInt64(UErrorCode& status) const; /** * Gets the Date value of this object. If this object is not of type * kDate then the result is undefined. * @return the Date value of this object. * @stable ICU 2.0 */ UDate getDate() const { return fValue.fDate; } /** * Gets the Date value of this object. If the type is not a date, * status is set to U_INVALID_FORMAT_ERROR and the return value is * undefined. * @param status the error code. * @return the Date value of this object. * @stable ICU 3.0 */ UDate getDate(UErrorCode& status) const; /** * Gets the string value of this object. If this object is not of type * kString then the result is undefined. * @param result Output param to receive the Date value of this object. * @return A reference to 'result'. * @stable ICU 2.0 */ UnicodeString& getString(UnicodeString& result) const { result=*fValue.fString; return result; } /** * Gets the string value of this object. If the type is not a * string, status is set to U_INVALID_FORMAT_ERROR and a bogus * string is returned. * @param result Output param to receive the Date value of this object. * @param status the error code. * @return A reference to 'result'. * @stable ICU 3.0 */ UnicodeString& getString(UnicodeString& result, UErrorCode& status) const; /** * Gets a const reference to the string value of this object. If * this object is not of type kString then the result is * undefined. * @return a const reference to the string value of this object. * @stable ICU 2.0 */ inline const UnicodeString& getString(void) const; /** * Gets a const reference to the string value of this object. If * the type is not a string, status is set to * U_INVALID_FORMAT_ERROR and the result is a bogus string. * @param status the error code. * @return a const reference to the string value of this object. * @stable ICU 3.0 */ const UnicodeString& getString(UErrorCode& status) const; /** * Gets a reference to the string value of this object. If this * object is not of type kString then the result is undefined. * @return a reference to the string value of this object. * @stable ICU 2.0 */ inline UnicodeString& getString(void); /** * Gets a reference to the string value of this object. If the * type is not a string, status is set to U_INVALID_FORMAT_ERROR * and the result is a bogus string. * @param status the error code. * @return a reference to the string value of this object. * @stable ICU 3.0 */ UnicodeString& getString(UErrorCode& status); /** * Gets the array value and count of this object. If this object * is not of type kArray then the result is undefined. * @param count fill-in with the count of this object. * @return the array value of this object. * @stable ICU 2.0 */ const Formattable* getArray(int32_t& count) const { count=fValue.fArrayAndCount.fCount; return fValue.fArrayAndCount.fArray; } /** * Gets the array value and count of this object. If the type is * not an array, status is set to U_INVALID_FORMAT_ERROR, count is * set to 0, and the result is NULL. * @param count fill-in with the count of this object. * @param status the error code. * @return the array value of this object. * @stable ICU 3.0 */ const Formattable* getArray(int32_t& count, UErrorCode& status) const; /** * Accesses the specified element in the array value of this * Formattable object. If this object is not of type kArray then * the result is undefined. * @param index the specified index. * @return the accessed element in the array. * @stable ICU 2.0 */ Formattable& operator[](int32_t index) { return fValue.fArrayAndCount.fArray[index]; } /** * Returns a pointer to the UObject contained within this * formattable, or NULL if this object does not contain a UObject. * @return a UObject pointer, or NULL * @stable ICU 3.0 */ const UObject* getObject() const; /** * Sets the double value of this object and changes the type to * kDouble. * @param d the new double value to be set. * @stable ICU 2.0 */ void setDouble(double d); /** * Sets the long value of this object and changes the type to * kLong. * @param l the new long value to be set. * @stable ICU 2.0 */ void setLong(int32_t l); /** * Sets the int64 value of this object and changes the type to * kInt64. * @param ll the new int64 value to be set. * @stable ICU 2.8 */ void setInt64(int64_t ll); /** * Sets the Date value of this object and changes the type to * kDate. * @param d the new Date value to be set. * @stable ICU 2.0 */ void setDate(UDate d); /** * Sets the string value of this object and changes the type to * kString. * @param stringToCopy the new string value to be set. * @stable ICU 2.0 */ void setString(const UnicodeString& stringToCopy); /** * Sets the array value and count of this object and changes the * type to kArray. * @param array the array value. * @param count the number of array elements to be copied. * @stable ICU 2.0 */ void setArray(const Formattable* array, int32_t count); /** * Sets and adopts the string value and count of this object and * changes the type to kArray. * @param stringToAdopt the new string value to be adopted. * @stable ICU 2.0 */ void adoptString(UnicodeString* stringToAdopt); /** * Sets and adopts the array value and count of this object and * changes the type to kArray. * @stable ICU 2.0 */ void adoptArray(Formattable* array, int32_t count); /** * Sets and adopts the UObject value of this object and changes * the type to kObject. After this call, the caller must not * delete the given object. * @param objectToAdopt the UObject value to be adopted * @stable ICU 3.0 */ void adoptObject(UObject* objectToAdopt); /** * ICU "poor man's RTTI", returns a UClassID for the actual class. * * @stable ICU 2.2 */ virtual UClassID getDynamicClassID() const; /** * ICU "poor man's RTTI", returns a UClassID for this class. * * @stable ICU 2.2 */ static UClassID U_EXPORT2 getStaticClassID(); /** * Deprecated variant of getLong(UErrorCode&). * @param status the error code * @return the long value of this object. * @deprecated ICU 3.0 use getLong(UErrorCode&) instead */ inline int32_t getLong(UErrorCode* status) const; private: /** * Cleans up the memory for unwanted values. For example, the adopted * string or array objects. */ void dispose(void); UnicodeString* getBogus() const; union { UObject* fObject; UnicodeString* fString; double fDouble; int64_t fInt64; UDate fDate; struct { Formattable* fArray; int32_t fCount; } fArrayAndCount; } fValue; Type fType; UnicodeString fBogus; // Bogus string when it's needed. }; inline UDate Formattable::getDate(UErrorCode& status) const { if (fType != kDate) { if (U_SUCCESS(status)) { status = U_INVALID_FORMAT_ERROR; } return 0; } return fValue.fDate; } inline const UnicodeString& Formattable::getString(void) const { return *fValue.fString; } inline UnicodeString& Formattable::getString(void) { return *fValue.fString; } inline int32_t Formattable::getLong(UErrorCode* status) const { return getLong(*status); } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_FORMATTING */ #endif //_FMTABLE //eof