/usr/include/unicode/coleitr.h (14102B)
* "ca" -> the first key is key('c') and second key is key('a').
* "cha" -> the first key is key('ch') and second key is key('a').
* And in German phonebook collation,
* \htmlonly "æb"-> the first key is key('a'), the second key is key('e'), and
* the third key is key('b'). \endhtmlonly
* The key of a character, is an integer composed of primary order(short),
* secondary order(char), and tertiary order(char). Java strictly defines the
* size and signedness of its primitive data types. Therefore, the static
* functions primaryOrder(), secondaryOrder(), and tertiaryOrder() return
* int32_t to ensure the correctness of the key value.
* Example of the iterator usage: (without error checking) *
* \code
* void CollationElementIterator_Example()
* {
* UnicodeString str = "This is a test";
* UErrorCode success = U_ZERO_ERROR;
* RuleBasedCollator* rbc =
* (RuleBasedCollator*) RuleBasedCollator::createInstance(success);
* CollationElementIterator* c =
* rbc->createCollationElementIterator( str );
* int32_t order = c->next(success);
* c->reset();
* order = c->previous(success);
* delete c;
* delete rbc;
* }
* \endcode
*
* * The method next() returns the collation order of the next character based on * the comparison level of the collator. The method previous() returns the * collation order of the previous character based on the comparison level of * the collator. The Collation Element Iterator moves only in one direction * between calls to reset(), setOffset(), or setText(). That is, next() * and previous() can not be inter-used. Whenever previous() is to be called after * next() or vice versa, reset(), setOffset() or setText() has to be called first * to reset the status, shifting pointers to either the end or the start of * the string (reset() or setText()), or the specified position (setOffset()). * Hence at the next call of next() or previous(), the first or last collation order, * or collation order at the specified position will be returned. If a change of * direction is done without one of these calls, the result is undefined. *
* The result of a forward iterate (next()) and reversed result of the backward
* iterate (previous()) on the same string are equivalent, if collation orders
* with the value 0 are ignored.
* Character based on the comparison level of the collator. A collation order
* consists of primary order, secondary order and tertiary order. The data
* type of the collation order is int32_t.
*
* Note, CollationElementIterator should not be subclassed.
* @see Collator
* @see RuleBasedCollator
* @version 1.8 Jan 16 2001
*/
class U_I18N_API CollationElementIterator U_FINAL : public UObject {
public:
// CollationElementIterator public data member ------------------------------
enum {
/**
* NULLORDER indicates that an error has occurred while processing
* @stable ICU 2.0
*/
NULLORDER = (int32_t)0xffffffff
};
// CollationElementIterator public constructor/destructor -------------------
/**
* Copy constructor.
*
* @param other the object to be copied from
* @stable ICU 2.0
*/
CollationElementIterator(const CollationElementIterator& other);
/**
* Destructor
* @stable ICU 2.0
*/
virtual ~CollationElementIterator();
// CollationElementIterator public methods ----------------------------------
/**
* Returns true if "other" is the same as "this"
*
* @param other the object to be compared
* @return true if "other" is the same as "this"
* @stable ICU 2.0
*/
bool operator==(const CollationElementIterator& other) const;
/**
* Returns true if "other" is not the same as "this".
*
* @param other the object to be compared
* @return true if "other" is not the same as "this"
* @stable ICU 2.0
*/
bool operator!=(const CollationElementIterator& other) const;
/**
* Resets the cursor to the beginning of the string.
* @stable ICU 2.0
*/
void reset(void);
/**
* Gets the ordering priority of the next character in the string.
* @param status the error code status.
* @return the next character's ordering. otherwise returns NULLORDER if an
* error has occurred or if the end of string has been reached
* @stable ICU 2.0
*/
int32_t next(UErrorCode& status);
/**
* Get the ordering priority of the previous collation element in the string.
* @param status the error code status.
* @return the previous element's ordering. otherwise returns NULLORDER if an
* error has occurred or if the start of string has been reached
* @stable ICU 2.0
*/
int32_t previous(UErrorCode& status);
/**
* Gets the primary order of a collation order.
* @param order the collation order
* @return the primary order of a collation order.
* @stable ICU 2.0
*/
static inline int32_t primaryOrder(int32_t order);
/**
* Gets the secondary order of a collation order.
* @param order the collation order
* @return the secondary order of a collation order.
* @stable ICU 2.0
*/
static inline int32_t secondaryOrder(int32_t order);
/**
* Gets the tertiary order of a collation order.
* @param order the collation order
* @return the tertiary order of a collation order.
* @stable ICU 2.0
*/
static inline int32_t tertiaryOrder(int32_t order);
/**
* Return the maximum length of any expansion sequences that end with the
* specified comparison order.
* @param order a collation order returned by previous or next.
* @return maximum size of the expansion sequences ending with the collation
* element or 1 if collation element does not occur at the end of any
* expansion sequence
* @stable ICU 2.0
*/
int32_t getMaxExpansion(int32_t order) const;
/**
* Gets the comparison order in the desired strength. Ignore the other
* differences.
* @param order The order value
* @stable ICU 2.0
*/
int32_t strengthOrder(int32_t order) const;
/**
* Sets the source string.
* @param str the source string.
* @param status the error code status.
* @stable ICU 2.0
*/
void setText(const UnicodeString& str, UErrorCode& status);
/**
* Sets the source string.
* @param str the source character iterator.
* @param status the error code status.
* @stable ICU 2.0
*/
void setText(CharacterIterator& str, UErrorCode& status);
/**
* Checks if a comparison order is ignorable.
* @param order the collation order.
* @return true if a character is ignorable, false otherwise.
* @stable ICU 2.0
*/
static inline UBool isIgnorable(int32_t order);
/**
* Gets the offset of the currently processed character in the source string.
* @return the offset of the character.
* @stable ICU 2.0
*/
int32_t getOffset(void) const;
/**
* Sets the offset of the currently processed character in the source string.
* @param newOffset the new offset.
* @param status the error code status.
* @return the offset of the character.
* @stable ICU 2.0
*/
void setOffset(int32_t newOffset, UErrorCode& status);
/**
* ICU "poor man's RTTI", returns a UClassID for the actual class.
*
* @stable ICU 2.2
*/
virtual UClassID getDynamicClassID() const override;
/**
* ICU "poor man's RTTI", returns a UClassID for this class.
*
* @stable ICU 2.2
*/
static UClassID U_EXPORT2 getStaticClassID();
#ifndef U_HIDE_INTERNAL_API
/** @internal */
static inline CollationElementIterator *fromUCollationElements(UCollationElements *uc) {
return reinterpret_cast