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+/*
+ *******************************************************************************
+ * Copyright (C) 2014-2016, International Business Machines Corporation and others.
+ * All Rights Reserved.
+ *******************************************************************************
+ */
+
+#ifndef REGION_H
+#define REGION_H
+
+/**
+ * \file
+ * \brief C++ API: Region classes (territory containment)
+ */
+
+#include "unicode/utypes.h"
+#include "unicode/uregion.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/uobject.h"
+#include "unicode/uniset.h"
+#include "unicode/unistr.h"
+#include "unicode/strenum.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * <code>Region</code> is the class representing a Unicode Region Code, also known as a
+ * Unicode Region Subtag, which is defined based upon the BCP 47 standard. We often think of
+ * "regions" as "countries" when defining the characteristics of a locale.  Region codes There are different
+ * types of region codes that are important to distinguish.
+ * <p>
+ *  Macroregion - A code for a "macro geographical (continental) region, geographical sub-region, or
+ *  selected economic and other grouping" as defined in
+ *  UN M.49 (http://unstats.un.org/unsd/methods/m49/m49regin.htm).
+ *  These are typically 3-digit codes, but contain some 2-letter codes, such as the LDML code QO
+ *  added for Outlying Oceania.  Not all UNM.49 codes are defined in LDML, but most of them are.
+ *  Macroregions are represented in ICU by one of three region types: WORLD ( region code 001 ),
+ *  CONTINENTS ( regions contained directly by WORLD ), and SUBCONTINENTS ( things contained directly
+ *  by a continent ).
+ *  <p>
+ *  TERRITORY - A Region that is not a Macroregion. These are typically codes for countries, but also
+ *  include areas that are not separate countries, such as the code "AQ" for Antarctica or the code
+ *  "HK" for Hong Kong (SAR China). Overseas dependencies of countries may or may not have separate
+ *  codes. The codes are typically 2-letter codes aligned with the ISO 3166 standard, but BCP47 allows
+ *  for the use of 3-digit codes in the future.
+ *  <p>
+ *  UNKNOWN - The code ZZ is defined by Unicode LDML for use to indicate that the Region is unknown,
+ *  or that the value supplied as a region was invalid.
+ *  <p>
+ *  DEPRECATED - Region codes that have been defined in the past but are no longer in modern usage,
+ *  usually due to a country splitting into multiple territories or changing its name.
+ *  <p>
+ *  GROUPING - A widely understood grouping of territories that has a well defined membership such
+ *  that a region code has been assigned for it.  Some of these are UNM.49 codes that do't fall into
+ *  the world/continent/sub-continent hierarchy, while others are just well known groupings that have
+ *  their own region code. Region "EU" (European Union) is one such region code that is a grouping.
+ *  Groupings will never be returned by the getContainingRegion() API, since a different type of region
+ *  ( WORLD, CONTINENT, or SUBCONTINENT ) will always be the containing region instead.
+ *
+ * The Region class is not intended for public subclassing.
+ *
+ * @author       John Emmons
+ * @stable ICU 51
+ */
+
+class U_I18N_API Region : public UObject {
+public:
+    /**
+     * Destructor.
+     * @stable ICU 51
+     */
+    virtual ~Region();
+
+    /**
+     * Returns true if the two regions are equal.
+     * @stable ICU 51
+     */
+    UBool operator==(const Region &that) const;
+
+    /**
+     * Returns true if the two regions are NOT equal; that is, if operator ==() returns false.
+     * @stable ICU 51
+     */
+    UBool operator!=(const Region &that) const;
+
+    /**
+     * Returns a pointer to a Region using the given region code.  The region code can be either 2-letter ISO code,
+     * 3-letter ISO code,  UNM.49 numeric code, or other valid Unicode Region Code as defined by the LDML specification.
+     * The identifier will be canonicalized internally using the supplemental metadata as defined in the CLDR.
+     * If the region code is NULL or not recognized, the appropriate error code will be set ( U_ILLEGAL_ARGUMENT_ERROR )
+     * @stable ICU 51
+     */
+    static const Region* U_EXPORT2 getInstance(const char *region_code, UErrorCode &status);
+
+    /**
+     * Returns a pointer to a Region using the given numeric region code. If the numeric region code is not recognized,
+     * the appropriate error code will be set ( U_ILLEGAL_ARGUMENT_ERROR ).
+     * @stable ICU 51
+     */
+    static const Region* U_EXPORT2 getInstance (int32_t code, UErrorCode &status);
+
+    /**
+     * Returns an enumeration over the IDs of all known regions that match the given type.
+     * @stable ICU 55
+     */
+    static StringEnumeration* U_EXPORT2 getAvailable(URegionType type, UErrorCode &status);
+
+    /**
+     * Returns a pointer to the region that contains this region.  Returns NULL if this region is code "001" (World)
+     * or "ZZ" (Unknown region). For example, calling this method with region "IT" (Italy) returns the
+     * region "039" (Southern Europe).
+     * @stable ICU 51
+     */
+    const Region* getContainingRegion() const;
+
+    /**
+     * Return a pointer to the region that geographically contains this region and matches the given type,
+     * moving multiple steps up the containment chain if necessary.  Returns NULL if no containing region can be found
+     * that matches the given type. Note: The URegionTypes = "URGN_GROUPING", "URGN_DEPRECATED", or "URGN_UNKNOWN"
+     * are not appropriate for use in this API. NULL will be returned in this case. For example, calling this method
+     * with region "IT" (Italy) for type "URGN_CONTINENT" returns the region "150" ( Europe ).
+     * @stable ICU 51
+     */
+    const Region* getContainingRegion(URegionType type) const;
+
+    /**
+     * Return an enumeration over the IDs of all the regions that are immediate children of this region in the
+     * region hierarchy. These returned regions could be either macro regions, territories, or a mixture of the two,
+     * depending on the containment data as defined in CLDR.  This API may return NULL if this region doesn't have
+     * any sub-regions. For example, calling this method with region "150" (Europe) returns an enumeration containing
+     * the various sub regions of Europe - "039" (Southern Europe) - "151" (Eastern Europe) - "154" (Northern Europe)
+     * and "155" (Western Europe).
+     * @stable ICU 55
+     */
+    StringEnumeration* getContainedRegions(UErrorCode &status) const;
+
+    /**
+     * Returns an enumeration over the IDs of all the regions that are children of this region anywhere in the region
+     * hierarchy and match the given type.  This API may return an empty enumeration if this region doesn't have any
+     * sub-regions that match the given type. For example, calling this method with region "150" (Europe) and type
+     * "URGN_TERRITORY" returns a set containing all the territories in Europe ( "FR" (France) - "IT" (Italy) - "DE" (Germany) etc. )
+     * @stable ICU 55
+     */
+    StringEnumeration* getContainedRegions( URegionType type, UErrorCode &status ) const;
+
+    /**
+     * Returns true if this region contains the supplied other region anywhere in the region hierarchy.
+     * @stable ICU 51
+     */
+    UBool contains(const Region &other) const;
+
+    /**
+     * For deprecated regions, return an enumeration over the IDs of the regions that are the preferred replacement
+     * regions for this region.  Returns null for a non-deprecated region.  For example, calling this method with region
+     * "SU" (Soviet Union) would return a list of the regions containing "RU" (Russia), "AM" (Armenia), "AZ" (Azerbaijan), etc...
+     * @stable ICU 55
+     */
+    StringEnumeration* getPreferredValues(UErrorCode &status) const;
+
+    /**
+     * Return this region's canonical region code.
+     * @stable ICU 51
+     */
+    const char* getRegionCode() const;
+
+    /**
+     * Return this region's numeric code.
+     * Returns a negative value if the given region does not have a numeric code assigned to it.
+     * @stable ICU 51
+     */
+    int32_t getNumericCode() const;
+
+    /**
+     * Returns the region type of this region.
+     * @stable ICU 51
+     */
+    URegionType getType() const;
+
+#ifndef U_HIDE_INTERNAL_API
+    /**
+     * Cleans up statically allocated memory.
+     * @internal
+     */
+    static void cleanupRegionData();
+#endif  /* U_HIDE_INTERNAL_API */
+
+private:
+    char id[4];
+    UnicodeString idStr;
+    int32_t code;
+    URegionType type;
+    Region *containingRegion;
+    UVector *containedRegions;
+    UVector *preferredValues;
+
+    /**
+     * Default Constructor. Internal - use factory methods only.
+     */
+    Region();
+
+
+    /*
+     * Initializes the region data from the ICU resource bundles.  The region data
+     * contains the basic relationships such as which regions are known, what the numeric
+     * codes are, any known aliases, and the territory containment data.
+     *
+     * If the region data has already loaded, then this method simply returns without doing
+     * anything meaningful.
+     */
+
+    static void loadRegionData(UErrorCode &status);
+
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+#endif // REGION_H
+
+//eof