third_party/icu/source/common/pluralmap.h - cobalt - Git at Google

 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 ******************************************************************************
 * Copyright (C) 2015, International Business Machines Corporation and
 * others. All Rights Reserved.
 ******************************************************************************
 *
 * File pluralmap.h - PluralMap class that maps plural categories to values.
 ******************************************************************************
 */

 #ifndef __PLURAL_MAP_H__
 #define __PLURAL_MAP_H__

 #include "unicode/uobject.h"
 #include "cmemory.h"

 U_NAMESPACE_BEGIN

 class UnicodeString;

 class U_COMMON_API PluralMapBase : public UMemory {
 public:
     /**
      * The names of all the plural categories. NONE is not an actual plural
      * category, but rather represents the absense of a plural category.
      */
     enum Category {
         NONE = -1,
         OTHER,
         ZERO,
         ONE,
         TWO,
         FEW,
         MANY,
         CATEGORY_COUNT
     };

     /**
      * Converts a category name such as "zero", "one", "two", "few", "many"
      * or "other" to a category enum. Returns NONE for an unrecognized
      * category name.
      */
     static Category toCategory(const char *categoryName);

     /**
      * Converts a category name such as "zero", "one", "two", "few", "many"
      * or "other" to a category enum.  Returns NONE for urecongized
      * category name.
      */
     static Category toCategory(const UnicodeString &categoryName);

     /**
      * Converts a category to a name.
      * Passing NONE or CATEGORY_COUNT for category returns NULL.
      */
     static const char *getCategoryName(Category category);
 };

 /**
  * A Map of plural categories to values. It maintains ownership of the
  * values.
  *
  * Type T is the value type. T must provide the followng:
  * 1) Default constructor
  * 2) Copy constructor
  * 3) Assignment operator
  * 4) Must extend UMemory
  */
 template<typename T>
 class PluralMap : public PluralMapBase {
 public:
     /**
      * Other category is maps to a copy of the default value.
      */
     PluralMap() : fOtherVariant() {
         initializeNew();
     }

     /**
      * Other category is mapped to otherVariant.
      */
     PluralMap(const T &otherVariant) : fOtherVariant(otherVariant) {
         initializeNew();
     }

     PluralMap(const PluralMap<T> &other) : fOtherVariant(other.fOtherVariant) {
         fVariants[0] = &fOtherVariant;
         for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
             fVariants[i] = other.fVariants[i] ?
                     new T(*other.fVariants[i]) : NULL;
         }
     }

     PluralMap<T> &operator=(const PluralMap<T> &other) {
         if (this == &other) {
             return *this;
         }
         for (int32_t i = 0; i < UPRV_LENGTHOF(fVariants); ++i) {
             if (fVariants[i] != NULL && other.fVariants[i] != NULL) {
                 *fVariants[i] = *other.fVariants[i];
             } else if (fVariants[i] != NULL) {
                 delete fVariants[i];
                 fVariants[i] = NULL;
             } else if (other.fVariants[i] != NULL) {
                 fVariants[i] = new T(*other.fVariants[i]);
             } else {
                 // do nothing
             }
         }
         return *this;
     }

     ~PluralMap() {
         for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
             delete fVariants[i];
         }
     }

     /**
      * Removes all mappings and makes 'other' point to the default value.
      */
     void clear() {
         *fVariants[0] = T();
         for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
             delete fVariants[i];
             fVariants[i] = NULL;
         }
     }

     /**
      * Iterates through the mappings in this instance, set index to NONE
      * prior to using. Call next repeatedly to get the values until it
      * returns NULL. Each time next returns, caller may pass index
      * to getCategoryName() to get the name of the plural category.
      * When this function returns NULL, index is CATEGORY_COUNT
      */
     const T *next(Category &index) const {
         int32_t idx = index;
         ++idx;
         for (; idx < UPRV_LENGTHOF(fVariants); ++idx) {
             if (fVariants[idx] != NULL) {
                 index = static_cast<Category>(idx);
                 return fVariants[idx];
             }
         }
         index = static_cast<Category>(idx);
         return NULL;
     }

     /**
      * non const version of next.
      */
     T *nextMutable(Category &index) {
         const T *result = next(index);
         return const_cast<T *>(result);
     }

     /**
      * Returns the 'other' variant.
      * Same as calling get(OTHER).
      */
     const T &getOther() const {
         return get(OTHER);
     }

     /**
      * Returns the value associated with a category.
      * If no value found, or v is NONE or CATEGORY_COUNT, falls
      * back to returning the value for the 'other' category.
      */
     const T &get(Category v) const {
         int32_t index = v;
         if (index < 0 || index >= UPRV_LENGTHOF(fVariants) || fVariants[index] == NULL) {
             return *fVariants[0];
         }
         return *fVariants[index];
     }

     /**
      * Convenience routine to get the value by category name. Otherwise
      * works just like get(Category).
      */
     const T &get(const char *category) const {
         return get(toCategory(category));
     }

     /**
      * Convenience routine to get the value by category name as a
      * UnicodeString. Otherwise works just like get(category).
      */
     const T &get(const UnicodeString &category) const {
         return get(toCategory(category));
     }

     /**
      * Returns a pointer to the value associated with a category
      * that caller can safely modify. If the value was defaulting to the 'other'
      * variant because no explicit value was stored, this method creates a
      * new value using the default constructor at the returned pointer.
      *
      * @param category the category with the value to change.
      * @param status error returned here if index is NONE or CATEGORY_COUNT
      *  or memory could not be allocated, or any other error happens.
      */
     T *getMutable(
             Category category,
             UErrorCode &status) {
         return getMutable(category, NULL, status);
     }

     /**
      * Convenience routine to get a mutable pointer to a value by category name.
      * Otherwise works just like getMutable(Category, UErrorCode &).
      * reports an error if the category name is invalid.
      */
     T *getMutable(
             const char *category,
             UErrorCode &status) {
         return getMutable(toCategory(category), NULL, status);
     }

     /**
      * Just like getMutable(Category, UErrorCode &) but copies defaultValue to
      * returned pointer if it was defaulting to the 'other' variant
      * because no explicit value was stored.
      */
     T *getMutableWithDefault(
             Category category,
             const T &defaultValue,
             UErrorCode &status) {
         return getMutable(category, &defaultValue, status);
     }

     /**
      * Returns true if this object equals rhs.
      */
     UBool equals(
             const PluralMap<T> &rhs,
             UBool (*eqFunc)(const T &, const T &)) const {
         for (int32_t i = 0; i < UPRV_LENGTHOF(fVariants); ++i) {
             if (fVariants[i] == rhs.fVariants[i]) {
                 continue;
             }
             if (fVariants[i] == NULL || rhs.fVariants[i] == NULL) {
                 return false;
             }
             if (!eqFunc(*fVariants[i], *rhs.fVariants[i])) {
                 return false;
             }
         }
         return true;
     }

 private:
     T fOtherVariant;
     T* fVariants[6];

     T *getMutable(
             Category category,
             const T *defaultValue,
             UErrorCode &status) {
         if (U_FAILURE(status)) {
             return NULL;
         }
         int32_t index = category;
         if (index < 0 || index >= UPRV_LENGTHOF(fVariants)) {
             status = U_ILLEGAL_ARGUMENT_ERROR;
             return NULL;
         }
         if (fVariants[index] == NULL) {
             fVariants[index] = defaultValue == NULL ?
                     new T() : new T(*defaultValue);
         }
         if (!fVariants[index]) {
             status = U_MEMORY_ALLOCATION_ERROR;
         }
         return fVariants[index];
     }

     void initializeNew() {
         fVariants[0] = &fOtherVariant;
         for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
             fVariants[i] = NULL;
         }
     }
 };

 U_NAMESPACE_END

 #endif
	// © 2016 and later: Unicode, Inc. and others.
	// License & terms of use: http://www.unicode.org/copyright.html
	/*
	******************************************************************************
	* Copyright (C) 2015, International Business Machines Corporation and
	* others. All Rights Reserved.
	******************************************************************************
	*
	* File pluralmap.h - PluralMap class that maps plural categories to values.
	******************************************************************************
	*/

	#ifndef __PLURAL_MAP_H__
	#define __PLURAL_MAP_H__

	#include "unicode/uobject.h"
	#include "cmemory.h"

	U_NAMESPACE_BEGIN

	class UnicodeString;

	class U_COMMON_API PluralMapBase : public UMemory {
	public:
	/**
	* The names of all the plural categories. NONE is not an actual plural
	* category, but rather represents the absense of a plural category.
	*/
	enum Category {
	NONE = -1,
	OTHER,
	ZERO,
	ONE,
	TWO,
	FEW,
	MANY,
	CATEGORY_COUNT
	};

	/**
	* Converts a category name such as "zero", "one", "two", "few", "many"
	* or "other" to a category enum. Returns NONE for an unrecognized
	* category name.
	*/
	static Category toCategory(const char *categoryName);

	/**
	* Converts a category name such as "zero", "one", "two", "few", "many"
	* or "other" to a category enum. Returns NONE for urecongized
	* category name.
	*/
	static Category toCategory(const UnicodeString &categoryName);

	/**
	* Converts a category to a name.
	* Passing NONE or CATEGORY_COUNT for category returns NULL.
	*/
	static const char *getCategoryName(Category category);
	};

	/**
	* A Map of plural categories to values. It maintains ownership of the
	* values.
	*
	* Type T is the value type. T must provide the followng:
	* 1) Default constructor
	* 2) Copy constructor
	* 3) Assignment operator
	* 4) Must extend UMemory
	*/
	template<typename T>
	class PluralMap : public PluralMapBase {
	public:
	/**
	* Other category is maps to a copy of the default value.
	*/
	PluralMap() : fOtherVariant() {
	initializeNew();
	}

	/**
	* Other category is mapped to otherVariant.
	*/
	PluralMap(const T &otherVariant) : fOtherVariant(otherVariant) {
	initializeNew();
	}

	PluralMap(const PluralMap<T> &other) : fOtherVariant(other.fOtherVariant) {
	fVariants[0] = &fOtherVariant;
	for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
	fVariants[i] = other.fVariants[i] ?
	new T(*other.fVariants[i]) : NULL;
	}
	}

	PluralMap<T> &operator=(const PluralMap<T> &other) {
	if (this == &other) {
	return *this;
	}
	for (int32_t i = 0; i < UPRV_LENGTHOF(fVariants); ++i) {
	if (fVariants[i] != NULL && other.fVariants[i] != NULL) {
	fVariants[i] = other.fVariants[i];
	} else if (fVariants[i] != NULL) {
	delete fVariants[i];
	fVariants[i] = NULL;
	} else if (other.fVariants[i] != NULL) {
	fVariants[i] = new T(*other.fVariants[i]);
	} else {
	// do nothing
	}
	}
	return *this;
	}

	~PluralMap() {
	for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
	delete fVariants[i];
	}
	}

	/**
	* Removes all mappings and makes 'other' point to the default value.
	*/
	void clear() {
	*fVariants[0] = T();
	for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
	delete fVariants[i];
	fVariants[i] = NULL;
	}
	}

	/**
	* Iterates through the mappings in this instance, set index to NONE
	* prior to using. Call next repeatedly to get the values until it
	* returns NULL. Each time next returns, caller may pass index
	* to getCategoryName() to get the name of the plural category.
	* When this function returns NULL, index is CATEGORY_COUNT
	*/
	const T *next(Category &index) const {
	int32_t idx = index;
	++idx;
	for (; idx < UPRV_LENGTHOF(fVariants); ++idx) {
	if (fVariants[idx] != NULL) {
	index = static_cast<Category>(idx);
	return fVariants[idx];
	}
	}
	index = static_cast<Category>(idx);
	return NULL;
	}

	/**
	* non const version of next.
	*/
	T *nextMutable(Category &index) {
	const T *result = next(index);
	return const_cast<T *>(result);
	}

	/**
	* Returns the 'other' variant.
	* Same as calling get(OTHER).
	*/
	const T &getOther() const {
	return get(OTHER);
	}

	/**
	* Returns the value associated with a category.
	* If no value found, or v is NONE or CATEGORY_COUNT, falls
	* back to returning the value for the 'other' category.
	*/
	const T &get(Category v) const {
	int32_t index = v;
	if (index < 0 \|\| index >= UPRV_LENGTHOF(fVariants) \|\| fVariants[index] == NULL) {
	return *fVariants[0];
	}
	return *fVariants[index];
	}

	/**
	* Convenience routine to get the value by category name. Otherwise
	* works just like get(Category).
	*/
	const T &get(const char *category) const {
	return get(toCategory(category));
	}

	/**
	* Convenience routine to get the value by category name as a
	* UnicodeString. Otherwise works just like get(category).
	*/
	const T &get(const UnicodeString &category) const {
	return get(toCategory(category));
	}

	/**
	* Returns a pointer to the value associated with a category
	* that caller can safely modify. If the value was defaulting to the 'other'
	* variant because no explicit value was stored, this method creates a
	* new value using the default constructor at the returned pointer.
	*
	* @param category the category with the value to change.
	* @param status error returned here if index is NONE or CATEGORY_COUNT
	* or memory could not be allocated, or any other error happens.
	*/
	T *getMutable(
	Category category,
	UErrorCode &status) {
	return getMutable(category, NULL, status);
	}

	/**
	* Convenience routine to get a mutable pointer to a value by category name.
	* Otherwise works just like getMutable(Category, UErrorCode &).
	* reports an error if the category name is invalid.
	*/
	T *getMutable(
	const char *category,
	UErrorCode &status) {
	return getMutable(toCategory(category), NULL, status);
	}

	/**
	* Just like getMutable(Category, UErrorCode &) but copies defaultValue to
	* returned pointer if it was defaulting to the 'other' variant
	* because no explicit value was stored.
	*/
	T *getMutableWithDefault(
	Category category,
	const T &defaultValue,
	UErrorCode &status) {
	return getMutable(category, &defaultValue, status);
	}

	/**
	* Returns true if this object equals rhs.
	*/
	UBool equals(
	const PluralMap<T> &rhs,
	UBool (*eqFunc)(const T &, const T &)) const {
	for (int32_t i = 0; i < UPRV_LENGTHOF(fVariants); ++i) {
	if (fVariants[i] == rhs.fVariants[i]) {
	continue;
	}
	if (fVariants[i] == NULL \|\| rhs.fVariants[i] == NULL) {
	return false;
	}
	if (!eqFunc(fVariants[i], rhs.fVariants[i])) {
	return false;
	}
	}
	return true;
	}

	private:
	T fOtherVariant;
	T* fVariants[6];

	T *getMutable(
	Category category,
	const T *defaultValue,
	UErrorCode &status) {
	if (U_FAILURE(status)) {
	return NULL;
	}
	int32_t index = category;
	if (index < 0 \|\| index >= UPRV_LENGTHOF(fVariants)) {
	status = U_ILLEGAL_ARGUMENT_ERROR;
	return NULL;
	}
	if (fVariants[index] == NULL) {
	fVariants[index] = defaultValue == NULL ?
	new T() : new T(*defaultValue);
	}
	if (!fVariants[index]) {
	status = U_MEMORY_ALLOCATION_ERROR;
	}
	return fVariants[index];
	}

	void initializeNew() {
	fVariants[0] = &fOtherVariant;
	for (int32_t i = 1; i < UPRV_LENGTHOF(fVariants); ++i) {
	fVariants[i] = NULL;
	}
	}
	};

	U_NAMESPACE_END

	#endif