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Edit File : sortkey.h \| Size : 11.12 KB
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ***************************************************************************** * Copyright (C) 1996-2014, International Business Machines Corporation and others. * All Rights Reserved. ***************************************************************************** * * File sortkey.h * * Created by: Helena Shih * * Modification History: * * Date Name Description * * 6/20/97 helena Java class name change. * 8/18/97 helena Added internal API documentation. * 6/26/98 erm Changed to use byte arrays and memcmp. ***************************************************************************** / #ifndef SORTKEY_H #define SORTKEY_H #include "unicode/utypes.h" /* * \file * \brief C++ API: Keys for comparing strings multiple times. / #if !UCONFIG_NO_COLLATION #include "unicode/uobject.h" #include "unicode/unistr.h" #include "unicode/coll.h" U_NAMESPACE_BEGIN / forward declaration / class RuleBasedCollator; class CollationKeyByteSink; /* * * Collation keys are generated by the Collator class. Use the CollationKey objects * instead of Collator to compare strings multiple times. A CollationKey * preprocesses the comparison information from the Collator object to * make the comparison faster. If you are not going to comparing strings * multiple times, then using the Collator object is generally faster, * since it only processes as much of the string as needed to make a * comparison. * <p> For example (with strength == tertiary) * <p>When comparing "Abernathy" to "Baggins-Smythworthy", Collator * only needs to process a couple of characters, while a comparison * with CollationKeys will process all of the characters. On the other hand, * if you are doing a sort of a number of fields, it is much faster to use * CollationKeys, since you will be comparing strings multiple times. * <p>Typical use of CollationKeys are in databases, where you store a CollationKey * in a hidden field, and use it for sorting or indexing. * * <p>Example of use: * <pre> * \code * UErrorCode success = U_ZERO_ERROR; * Collator* myCollator = Collator::createInstance(success); * CollationKey* keys = new CollationKey [3]; * myCollator->getCollationKey("Tom", keys[0], success ); * myCollator->getCollationKey("Dick", keys[1], success ); * myCollator->getCollationKey("Harry", keys[2], success ); * * // Inside body of sort routine, compare keys this way: * CollationKey tmp; * if(keys[0].compareTo( keys[1] ) > 0 ) { * tmp = keys[0]; keys[0] = keys[1]; keys[1] = tmp; * } * //... * \endcode * </pre> * <p>Because Collator::compare()'s algorithm is complex, it is faster to sort * long lists of words by retrieving collation keys with Collator::getCollationKey(). * You can then cache the collation keys and compare them using CollationKey::compareTo(). * <p> * <strong>Note:</strong> <code>Collator</code>s with different Locale, * CollationStrength and DecompositionMode settings will return different * CollationKeys for the same set of strings. Locales have specific * collation rules, and the way in which secondary and tertiary differences * are taken into account, for example, will result in different CollationKeys * for same strings. * <p> * @see Collator * @see RuleBasedCollator * @version 1.3 12/18/96 * @author Helena Shih * @stable ICU 2.0 / class U_I18N_API CollationKey : public UObject { public: /* * This creates an empty collation key based on the null string. An empty * collation key contains no sorting information. When comparing two empty * collation keys, the result is Collator::EQUAL. Comparing empty collation key * with non-empty collation key is always Collator::LESS. * @stable ICU 2.0 / CollationKey(); /* * Creates a collation key based on the collation key values. * @param values the collation key values * @param count number of collation key values, including trailing nulls. * @stable ICU 2.0 / CollationKey(const uint8_t values, int32_t count); /** * Copy constructor. * @param other the object to be copied. * @stable ICU 2.0 / CollationKey(const CollationKey& other); /* * Sort key destructor. * @stable ICU 2.0 / virtual ~CollationKey(); /* * Assignment operator * @param other the object to be copied. * @stable ICU 2.0 / const CollationKey& operator=(const CollationKey& other); /* * Compare if two collation keys are the same. * @param source the collation key to compare to. * @return Returns true if two collation keys are equal, false otherwise. * @stable ICU 2.0 / UBool operator==(const CollationKey& source) const; /* * Compare if two collation keys are not the same. * @param source the collation key to compare to. * @return Returns TRUE if two collation keys are different, FALSE otherwise. * @stable ICU 2.0 / UBool operator!=(const CollationKey& source) const; /* * Test to see if the key is in an invalid state. The key will be in an * invalid state if it couldn't allocate memory for some operation. * @return Returns TRUE if the key is in an invalid, FALSE otherwise. * @stable ICU 2.0 / UBool isBogus(void) const; /* * Returns a pointer to the collation key values. The storage is owned * by the collation key and the pointer will become invalid if the key * is deleted. * @param count the output parameter of number of collation key values, * including any trailing nulls. * @return a pointer to the collation key values. * @stable ICU 2.0 / const uint8_t getByteArray(int32_t& count) const; #ifdef U_USE_COLLATION_KEY_DEPRECATES /** * Extracts the collation key values into a new array. The caller owns * this storage and should free it. * @param count the output parameter of number of collation key values, * including any trailing nulls. * @obsolete ICU 2.6. Use getByteArray instead since this API will be removed in that release. / uint8_t toByteArray(int32_t& count) const; #endif #ifndef U_HIDE_DEPRECATED_API /** * Convenience method which does a string(bit-wise) comparison of the * two collation keys. * @param target target collation key to be compared with * @return Returns Collator::LESS if sourceKey < targetKey, * Collator::GREATER if sourceKey > targetKey and Collator::EQUAL * otherwise. * @deprecated ICU 2.6 use the overload with error code / Collator::EComparisonResult compareTo(const CollationKey& target) const; #endif / U_HIDE_DEPRECATED_API / /* * Convenience method which does a string(bit-wise) comparison of the * two collation keys. * @param target target collation key to be compared with * @param status error code * @return Returns UCOL_LESS if sourceKey < targetKey, * UCOL_GREATER if sourceKey > targetKey and UCOL_EQUAL * otherwise. * @stable ICU 2.6 / UCollationResult compareTo(const CollationKey& target, UErrorCode &status) const; /* * Creates an integer that is unique to the collation key. NOTE: this * is not the same as String.hashCode. * <p>Example of use: * <pre> * . UErrorCode status = U_ZERO_ERROR; * . Collator myCollation = Collator::createInstance(Locale::US, status); . if (U_FAILURE(status)) return; * . CollationKey key1, key2; * . UErrorCode status1 = U_ZERO_ERROR, status2 = U_ZERO_ERROR; * . myCollation->getCollationKey("abc", key1, status1); * . if (U_FAILURE(status1)) { delete myCollation; return; } * . myCollation->getCollationKey("ABC", key2, status2); * . if (U_FAILURE(status2)) { delete myCollation; return; } * . // key1.hashCode() != key2.hashCode() * </pre> * @return the hash value based on the string's collation order. * @see UnicodeString#hashCode * @stable ICU 2.0 / int32_t hashCode(void) const; /* * 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(); private: /* * Replaces the current bytes buffer with a new one of newCapacity * and copies length bytes from the old buffer to the new one. * @return the new buffer, or NULL if the allocation failed / uint8_t reallocate(int32_t newCapacity, int32_t length); /** * Set a new length for a new sort key in the existing fBytes. / void setLength(int32_t newLength); uint8_t getBytes() { return (fFlagAndLength >= 0) ? fUnion.fStackBuffer : fUnion.fFields.fBytes; } const uint8_t getBytes() const { return (fFlagAndLength >= 0) ? fUnion.fStackBuffer : fUnion.fFields.fBytes; } int32_t getCapacity() const { return (fFlagAndLength >= 0) ? (int32_t)sizeof(fUnion) : fUnion.fFields.fCapacity; } int32_t getLength() const { return fFlagAndLength & 0x7fffffff; } /* * Set the CollationKey to a "bogus" or invalid state * @return this CollationKey / CollationKey& setToBogus(void); /* * Resets this CollationKey to an empty state * @return this CollationKey / CollationKey& reset(void); /* * Allow private access to RuleBasedCollator / friend class RuleBasedCollator; friend class CollationKeyByteSink; // Class fields. sizeof(CollationKey) is intended to be 48 bytes // on a machine with 64-bit pointers. // We use a union to maximize the size of the internal buffer, // similar to UnicodeString but not as tight and complex. // (implicit) vtable; /** * Sort key length and flag. * Bit 31 is set if the buffer is heap-allocated. * Bits 30..0 contain the sort key length. / int32_t fFlagAndLength; /* * Unique hash value of this CollationKey. * Special value 2 if the key is bogus. / mutable int32_t fHashCode; /* * fUnion provides 32 bytes for the internal buffer or for * pointer+capacity. / union StackBufferOrFields { /* fStackBuffer is used iff fFlagAndLength>=0, else fFields is used / uint8_t fStackBuffer[32]; struct { uint8_t fBytes; int32_t fCapacity; } fFields; } fUnion; }; inline UBool CollationKey::operator!=(const CollationKey& other) const { return !(this == other); } inline UBool CollationKey::isBogus() const { return fHashCode == 2; // kBogusHashCode } inline const uint8_t CollationKey::getByteArray(int32_t &count) const { count = getLength(); return getBytes(); } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_COLLATION */ #endif Back

Edit File : sortkey.h | Size : 11.12 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 *****************************************************************************
 * Copyright (C) 1996-2014, International Business Machines Corporation and others.
 * All Rights Reserved.
 *****************************************************************************
 *
 * File sortkey.h
 *
 * Created by: Helena Shih
 *
 * Modification History:
 *
 *  Date         Name          Description
 *
 *  6/20/97     helena      Java class name change.
 *  8/18/97     helena      Added internal API documentation.
 *  6/26/98     erm         Changed to use byte arrays and memcmp.
 *****************************************************************************
 */

#ifndef SORTKEY_H
#define SORTKEY_H

#include "unicode/utypes.h"

/**
 * \file 
 * \brief C++ API: Keys for comparing strings multiple times. 
 */
 
#if !UCONFIG_NO_COLLATION

#include "unicode/uobject.h"
#include "unicode/unistr.h"
#include "unicode/coll.h"

U_NAMESPACE_BEGIN

/* forward declaration */
class RuleBasedCollator;
class CollationKeyByteSink;

/**
 *
 * Collation keys are generated by the Collator class. Use the CollationKey objects
 * instead of Collator to compare strings multiple times. A CollationKey
 * preprocesses the comparison information from the Collator object to
 * make the comparison faster. If you are not going to comparing strings
 * multiple times, then using the Collator object is generally faster,
 * since it only processes as much of the string as needed to make a
 * comparison.
 * For example (with strength == tertiary)
 * When comparing "Abernathy" to "Baggins-Smythworthy", Collator
 * only needs to process a couple of characters, while a comparison
 * with CollationKeys will process all of the characters. On the other hand,
 * if you are doing a sort of a number of fields, it is much faster to use
 * CollationKeys, since you will be comparing strings multiple times.
 * Typical use of CollationKeys are in databases, where you store a CollationKey
 * in a hidden field, and use it for sorting or indexing.
 *
 * Example of use:
 * <pre>
 * \code
 * UErrorCode success = U_ZERO_ERROR;
 * Collator* myCollator = Collator::createInstance(success);
 * CollationKey* keys = new CollationKey [3];
 * myCollator->getCollationKey("Tom", keys[0], success );
 * myCollator->getCollationKey("Dick", keys[1], success );
 * myCollator->getCollationKey("Harry", keys[2], success );
 *
 * // Inside body of sort routine, compare keys this way:
 * CollationKey tmp;
 * if(keys[0].compareTo( keys[1] ) > 0 ) {
 * tmp = keys[0]; keys[0] = keys[1]; keys[1] = tmp;
 * }
 * //...
 * \endcode
 * </pre>
 * Because Collator::compare()'s algorithm is complex, it is faster to sort
 * long lists of words by retrieving collation keys with Collator::getCollationKey().
 * You can then cache the collation keys and compare them using CollationKey::compareTo().
 * 
 * Note: <code>Collator</code>s with different Locale,
 * CollationStrength and DecompositionMode settings will return different
 * CollationKeys for the same set of strings. Locales have specific
 * collation rules, and the way in which secondary and tertiary differences
 * are taken into account, for example, will result in different CollationKeys
 * for same strings.
 *

* @see          Collator
 * @see          RuleBasedCollator
 * @version      1.3 12/18/96
 * @author       Helena Shih
 * @stable ICU 2.0
 */
class U_I18N_API CollationKey : public UObject {
public:
    /**
    * This creates an empty collation key based on the null string.  An empty
    * collation key contains no sorting information.  When comparing two empty
    * collation keys, the result is Collator::EQUAL.  Comparing empty collation key
    * with non-empty collation key is always Collator::LESS.
    * @stable ICU 2.0
    */
    CollationKey();

/**
    * Creates a collation key based on the collation key values.
    * @param values the collation key values
    * @param count number of collation key values, including trailing nulls.
    * @stable ICU 2.0
    */
    CollationKey(const  uint8_t*    values,
                int32_t     count);

/**
    * Copy constructor.
    * @param other    the object to be copied.
    * @stable ICU 2.0
    */
    CollationKey(const CollationKey& other);

/**
    * Sort key destructor.
    * @stable ICU 2.0
    */
    virtual ~CollationKey();

/**
    * Assignment operator
    * @param other    the object to be copied.
    * @stable ICU 2.0
    */
    const   CollationKey&   operator=(const CollationKey& other);

/**
    * Compare if two collation keys are the same.
    * @param source the collation key to compare to.
    * @return Returns true if two collation keys are equal, false otherwise.
    * @stable ICU 2.0
    */
    UBool                   operator==(const CollationKey& source) const;

/**
    * Compare if two collation keys are not the same.
    * @param source the collation key to compare to.
    * @return Returns TRUE if two collation keys are different, FALSE otherwise.
    * @stable ICU 2.0
    */
    UBool                   operator!=(const CollationKey& source) const;

/**
    * Test to see if the key is in an invalid state. The key will be in an
    * invalid state if it couldn't allocate memory for some operation.
    * @return Returns TRUE if the key is in an invalid, FALSE otherwise.
    * @stable ICU 2.0
    */
    UBool                   isBogus(void) const;

/**
    * Returns a pointer to the collation key values. The storage is owned
    * by the collation key and the pointer will become invalid if the key
    * is deleted.
    * @param count the output parameter of number of collation key values,
    * including any trailing nulls.
    * @return a pointer to the collation key values.
    * @stable ICU 2.0
    */
    const    uint8_t*       getByteArray(int32_t& count) const;

#ifdef U_USE_COLLATION_KEY_DEPRECATES
    /**
    * Extracts the collation key values into a new array. The caller owns
    * this storage and should free it.
    * @param count the output parameter of number of collation key values,
    * including any trailing nulls.
    * @obsolete ICU 2.6. Use getByteArray instead since this API will be removed in that release.
    */
    uint8_t*                toByteArray(int32_t& count) const;
#endif

#ifndef U_HIDE_DEPRECATED_API 
    /**
    * Convenience method which does a string(bit-wise) comparison of the
    * two collation keys.
    * @param target target collation key to be compared with
    * @return Returns Collator::LESS if sourceKey &lt; targetKey,
    * Collator::GREATER if sourceKey > targetKey and Collator::EQUAL
    * otherwise.
    * @deprecated ICU 2.6 use the overload with error code
    */
    Collator::EComparisonResult compareTo(const CollationKey& target) const;
#endif  /* U_HIDE_DEPRECATED_API */

/**
    * Convenience method which does a string(bit-wise) comparison of the
    * two collation keys.
    * @param target target collation key to be compared with
    * @param status error code
    * @return Returns UCOL_LESS if sourceKey &lt; targetKey,
    * UCOL_GREATER if sourceKey > targetKey and UCOL_EQUAL
    * otherwise.
    * @stable ICU 2.6
    */
    UCollationResult compareTo(const CollationKey& target, UErrorCode &status) const;

/**
 * Creates an integer that is unique to the collation key. NOTE: this
 * is not the same as String.hashCode.
 * Example of use:
 * <pre>
 * . UErrorCode status = U_ZERO_ERROR;
 * . Collator *myCollation = Collator::createInstance(Locale::US, status);
 * . if (U_FAILURE(status)) return;
 * . CollationKey key1, key2;
 * . UErrorCode status1 = U_ZERO_ERROR, status2 = U_ZERO_ERROR;
 * . myCollation->getCollationKey("abc", key1, status1);
 * . if (U_FAILURE(status1)) { delete myCollation; return; }
 * . myCollation->getCollationKey("ABC", key2, status2);
 * . if (U_FAILURE(status2)) { delete myCollation; return; }
 * . // key1.hashCode() != key2.hashCode()
 * </pre>
 * @return the hash value based on the string's collation order.
 * @see UnicodeString#hashCode
 * @stable ICU 2.0
 */
 int32_t hashCode(void) const;

/**
     * 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();

private:
    /**
     * Replaces the current bytes buffer with a new one of newCapacity
     * and copies length bytes from the old buffer to the new one.
     * @return the new buffer, or NULL if the allocation failed
     */
    uint8_t *reallocate(int32_t newCapacity, int32_t length);
    /**
     * Set a new length for a new sort key in the existing fBytes.
     */
    void setLength(int32_t newLength);

uint8_t *getBytes() {
        return (fFlagAndLength >= 0) ? fUnion.fStackBuffer : fUnion.fFields.fBytes;
    }
    const uint8_t *getBytes() const {
        return (fFlagAndLength >= 0) ? fUnion.fStackBuffer : fUnion.fFields.fBytes;
    }
    int32_t getCapacity() const {
        return (fFlagAndLength >= 0) ? (int32_t)sizeof(fUnion) : fUnion.fFields.fCapacity;
    }
    int32_t getLength() const { return fFlagAndLength & 0x7fffffff; }

/**
    * Set the CollationKey to a "bogus" or invalid state
    * @return this CollationKey
    */
    CollationKey&           setToBogus(void);
    /**
    * Resets this CollationKey to an empty state
    * @return this CollationKey
    */
    CollationKey&           reset(void);

/**
    * Allow private access to RuleBasedCollator
    */
    friend  class           RuleBasedCollator;
    friend  class           CollationKeyByteSink;

// Class fields. sizeof(CollationKey) is intended to be 48 bytes
    // on a machine with 64-bit pointers.
    // We use a union to maximize the size of the internal buffer,
    // similar to UnicodeString but not as tight and complex.

// (implicit) *vtable;
    /**
     * Sort key length and flag.
     * Bit 31 is set if the buffer is heap-allocated.
     * Bits 30..0 contain the sort key length.
     */
    int32_t fFlagAndLength;
    /**
    * Unique hash value of this CollationKey.
    * Special value 2 if the key is bogus.
    */
    mutable int32_t fHashCode;
    /**
     * fUnion provides 32 bytes for the internal buffer or for
     * pointer+capacity.
     */
    union StackBufferOrFields {
        /** fStackBuffer is used iff fFlagAndLength>=0, else fFields is used */
        uint8_t fStackBuffer[32];
        struct {
            uint8_t *fBytes;
            int32_t fCapacity;
        } fFields;
    } fUnion;
};

inline UBool
CollationKey::operator!=(const CollationKey& other) const
{
    return !(*this == other);
}

inline UBool
CollationKey::isBogus() const
{
    return fHashCode == 2;  // kBogusHashCode
}

inline const uint8_t*
CollationKey::getByteArray(int32_t &count) const
{
    count = getLength();
    return getBytes();
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_COLLATION */

#endif

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