346 lines
11 KiB
C++
346 lines
11 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 1997-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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******************************************************************************
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*/
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/**
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* File coleitr.h
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*
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*
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*
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* Created by: Helena Shih
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*
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* Modification History:
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*
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* Date Name Description
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*
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* 8/18/97 helena Added internal API documentation.
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* 08/03/98 erm Synched with 1.2 version CollationElementIterator.java
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* 12/10/99 aliu Ported Thai collation support from Java.
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* 01/25/01 swquek Modified into a C++ wrapper calling C APIs (ucoliter.h)
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* 02/19/01 swquek Removed CollationElementsIterator() since it is
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* private constructor and no calls are made to it
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*/
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#ifndef COLEITR_H
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#define COLEITR_H
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#include "unicode/tblcoll.h"
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#include "unicode/ucoleitr.h"
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typedef struct UCollationElements UCollationElements;
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U_NAMESPACE_BEGIN
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/**
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* The CollationElementIterator class is used as an iterator to walk through
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* each character of an international string. Use the iterator to return the
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* ordering priority of the positioned character. The ordering priority of a
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* character, which we refer to as a key, defines how a character is collated in
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* the given collation object.
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* For example, consider the following in Spanish:
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* <pre>
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* \code
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* "ca" -> the first key is key('c') and second key is key('a').
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* "cha" -> the first key is key('ch') and second key is key('a').
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* \endcode
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* </pre>
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* And in German,
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* <pre>
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* \code
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* "æb"-> the first key is key('a'), the second key is key('e'), and
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* the third key is key('b').
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* \endcode
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* </pre>
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* The key of a character, is an integer composed of primary order(short),
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* secondary order(char), and tertiary order(char). Java strictly defines the
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* size and signedness of its primitive data types. Therefore, the static
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* functions primaryOrder(), secondaryOrder(), and tertiaryOrder() return
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* int32_t to ensure the correctness of the key value.
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* <p>Example of the iterator usage: (without error checking)
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* <pre>
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* \code
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* void CollationElementIterator_Example()
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* {
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* UnicodeString str = "This is a test";
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* UErrorCode success = U_ZERO_ERROR;
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* RuleBasedCollator* rbc =
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* (RuleBasedCollator*) RuleBasedCollator::createInstance(success);
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* CollationElementIterator* c =
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* rbc->createCollationElementIterator( str );
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* int32_t order = c->next(success);
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* c->reset();
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* order = c->previous(success);
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* delete c;
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* delete rbc;
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* }
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* \endcode
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* </pre>
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* <p>
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* CollationElementIterator::next returns the collation order of the next
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* character based on the comparison level of the collator.
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* CollationElementIterator::previous returns the collation order of the
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* previous character based on the comparison level of the collator.
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* The Collation Element Iterator moves only in one direction between calls to
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* CollationElementIterator::reset. That is, CollationElementIterator::next()
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* and CollationElementIterator::previous can not be inter-used. Whenever
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* CollationElementIterator::previous is to be called after
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* CollationElementIterator::next() or vice versa,
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* CollationElementIterator::reset has to be called first to reset the status,
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* shifting pointers to either the end or the start of the string. Hence at the
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* next call of CollationElementIterator::previous or
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* CollationElementIterator::next(), the first or last collation order will be
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* returned.
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* If a change of direction is done without a CollationElementIterator::reset(),
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* the result is undefined.
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* The result of a forward iterate (CollationElementIterator::next) and
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* reversed result of the backward iterate (CollationElementIterator::previous)
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* on the same string are equivalent, if collation orders with the value
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* UCOL_IGNORABLE are ignored.
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* Character based on the comparison level of the collator. A collation order
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* consists of primary order, secondary order and tertiary order. The data
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* type of the collation order is <strong>t_int32</strong>.
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*
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* Note, CollationElementIterator should not be subclassed.
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* @see Collator
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* @see RuleBasedCollator
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* @version 1.8 Jan 16 2001
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*/
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class U_I18N_API CollationElementIterator
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{
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public:
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// CollationElementIterator public data member ------------------------------
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/**
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* NULLORDER indicates that an error has occured while processing
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*/
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static int32_t const NULLORDER;
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// CollationElementIterator public constructor/destructor -------------------
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/**
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* Copy constructor.
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*/
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CollationElementIterator(const CollationElementIterator& other);
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/**
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* Destructor
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*/
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~CollationElementIterator();
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// CollationElementIterator public methods ----------------------------------
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/**
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* Returns true if "other" is the same as "this"
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*/
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UBool operator==(const CollationElementIterator& other) const;
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/**
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* Returns true if "other" is not the same as "this".
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*/
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UBool operator!=(const CollationElementIterator& other) const;
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/**
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* Resets the cursor to the beginning of the string.
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*/
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void reset(void);
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/**
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* Gets the ordering priority of the next character in the string.
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* @param status the error code status.
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* @return the next character's ordering. otherwise returns NULLORDER if an
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* error has occured or if the end of string has been reached
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*/
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int32_t next(UErrorCode& status);
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/**
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* Get the ordering priority of the previous collation element in the string.
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* @param status the error code status.
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* @return the previous element's ordering. otherwise returns NULLORDER if an
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* error has occured or if the start of string has been reached
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*/
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int32_t previous(UErrorCode& status);
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/**
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* Gets the primary order of a collation order.
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* @param order the collation order
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* @return the primary order of a collation order.
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*/
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static int32_t primaryOrder(int32_t order);
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/**
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* Gets the secondary order of a collation order.
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* @param order the collation order
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* @return the secondary order of a collation order.
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*/
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static int32_t secondaryOrder(int32_t order);
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/**
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* Gets the tertiary order of a collation order.
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* @param order the collation order
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* @return the tertiary order of a collation order.
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*/
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static int32_t tertiaryOrder(int32_t order);
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/**
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* Return the maximum length of any expansion sequences that end with the
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* specified comparison order.
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* @param order a collation order returned by previous or next.
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* @return maximum size of the expansion sequences ending with the collation
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* element or 1 if collation element does not occur at the end of any
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* expansion sequence
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*/
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int32_t getMaxExpansion(int32_t order) const;
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/**
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* Gets the comparison order in the desired strength. Ignore the other
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* differences.
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* @param order The order value
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*/
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int32_t strengthOrder(int32_t order) const;
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/**
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* Sets the source string.
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* @param str the source string.
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* @param status the error code status.
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*/
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void setText(const UnicodeString& str, UErrorCode& status);
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/**
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* Sets the source string.
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* @param str the source character iterator.
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* @param status the error code status.
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*/
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void setText(CharacterIterator& str, UErrorCode& status);
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/**
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* Checks if a comparison order is ignorable.
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* @param order the collation order.
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* @return TRUE if a character is ignorable, FALSE otherwise.
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*/
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static UBool isIgnorable(int32_t order);
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/**
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* Gets the offset of the currently processed character in the source string.
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* @return the offset of the character.
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*/
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UTextOffset getOffset(void) const;
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/**
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* Sets the offset of the currently processed character in the source string.
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* @param newOffset the new offset.
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* @param status the error code status.
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* @return the offset of the character.
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*/
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void setOffset(UTextOffset newOffset, UErrorCode& status);
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protected:
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// CollationElementIterator protected constructors --------------------------
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friend class RuleBasedCollator;
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/**
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* CollationElementIterator constructor. This takes the source string and the
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* collation object. The cursor will walk thru the source string based on the
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* predefined collation rules. If the source string is empty, NULLORDER will
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* be returned on the calls to next().
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* @param sourceText the source string.
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* @param startOffset the beginning offset of the string where the cursor
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* starts the iterating.
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* @param endOffset the ending offset of the string where the cursor stops the
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* iterating.
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* @param order the collation object.
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*/
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CollationElementIterator(const UnicodeString& sourceText,
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const RuleBasedCollator* order, UErrorCode& status);
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/**
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* CollationElementIterator constructor. This takes the source string and the
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* collation object. The cursor will walk thru the source string based on the
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* predefined collation rules. If the source string is empty, NULLORDER will
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* be returned on the calls to next().
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* @param sourceText the source string.
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* @param startOffset the beginning offset of the string where the cursor
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* starts the iterating.
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* @param endOffset the ending offset of the string where the cursor stops the
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* iterating.
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* @param order the collation object.
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*/
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CollationElementIterator(const CharacterIterator& sourceText,
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const RuleBasedCollator* order, UErrorCode& status);
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// CollationElementIterator protected methods -------------------------------
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/**
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* Assignment operator
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*/
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const CollationElementIterator&
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operator=(const CollationElementIterator& other);
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private:
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// CollationElementIterator private data members ----------------------------
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/**
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* Data wrapper for collation elements
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*/
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UCollationElements *m_data_;
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/**
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* Indicates if m_data_ belongs to this object.
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*/
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UBool isDataOwned_;
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};
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// CollationElementIterator inline method defination --------------------------
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/**
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* Get the primary order of a collation order.
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* @param order the collation order
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* @return the primary order of a collation order.
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*/
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inline int32_t CollationElementIterator::primaryOrder(int32_t order)
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{
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order &= RuleBasedCollator::PRIMARYORDERMASK;
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return (order >> RuleBasedCollator::PRIMARYORDERSHIFT);
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}
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/**
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* Get the secondary order of a collation order.
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* @param order the collation order
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* @return the secondary order of a collation order.
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*/
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inline int32_t CollationElementIterator::secondaryOrder(int32_t order)
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{
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order = order & RuleBasedCollator::SECONDARYORDERMASK;
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return (order >> RuleBasedCollator::SECONDARYORDERSHIFT);
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}
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/**
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* Get the tertiary order of a collation order.
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* @param order the collation order
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* @return the tertiary order of a collation order.
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*/
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inline int32_t CollationElementIterator::tertiaryOrder(int32_t order)
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{
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return (order &= RuleBasedCollator::TERTIARYORDERMASK);
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}
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inline int32_t CollationElementIterator::getMaxExpansion(int32_t order) const
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{
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return ucol_getMaxExpansion(m_data_, (uint32_t)order);
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}
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inline UBool CollationElementIterator::isIgnorable(int32_t order)
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{
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return (primaryOrder(order) == RuleBasedCollator::PRIMIGNORABLE);
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}
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U_NAMESPACE_END
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#endif
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