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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 *
6 *   Copyright (C) 2002-2006, International Business Machines
7 *   Corporation and others.  All Rights Reserved.
8 *
9 *******************************************************************************
10 *   file name:  uenumimp.h
11 *   encoding:   UTF-8
12 *   tab size:   8 (not used)
13 *   indentation:2
14 *
15 *   created on: 2002jul08
16 *   created by: Vladimir Weinstein
17 */
18 
19 #ifndef __UENUMIMP_H
20 #define __UENUMIMP_H
21 
22 #include "unicode/uenum.h"
23 
24 U_CDECL_BEGIN
25 
26 /**
27  * following are the type declarations for
28  * implementations of APIs. If any of these
29  * functions are NULL, U_UNSUPPORTED_ERROR
30  * is returned. If close is NULL, the enumeration
31  * object is going to be released.
32  * Initial error checking is done in the body
33  * of API function, so the implementations
34  * need not to check the initial error condition.
35  */
36 
37 /**
38  * Function type declaration for uenum_close().
39  *
40  * This function should cleanup the enumerator object
41  *
42  * @param en enumeration to be closed
43  */
44 typedef void U_CALLCONV
45 UEnumClose(UEnumeration *en);
46 
47 /**
48  * Function type declaration for uenum_count().
49  *
50  * This function should count the number of elements
51  * in this enumeration
52  *
53  * @param en enumeration to be counted
54  * @param status pointer to UErrorCode variable
55  * @return number of elements in enumeration
56  */
57 typedef int32_t U_CALLCONV
58 UEnumCount(UEnumeration *en, UErrorCode *status);
59 
60 /**
61  * Function type declaration for uenum_unext().
62  *
63  * This function returns the next element as a UChar *,
64  * or NULL after all elements haven been enumerated.
65  *
66  * @param en enumeration
67  * @param resultLength pointer to result length
68  * @param status pointer to UErrorCode variable
69  * @return next element as UChar *,
70  *         or NULL after all elements haven been enumerated
71  */
72 typedef const UChar* U_CALLCONV
73 UEnumUNext(UEnumeration* en,
74             int32_t* resultLength,
75             UErrorCode* status);
76 
77 /**
78  * Function type declaration for uenum_next().
79  *
80  * This function returns the next element as a char *,
81  * or NULL after all elements haven been enumerated.
82  *
83  * @param en enumeration
84  * @param resultLength pointer to result length
85  * @param status pointer to UErrorCode variable
86  * @return next element as char *,
87  *         or NULL after all elements haven been enumerated
88  */
89 typedef const char* U_CALLCONV
90 UEnumNext(UEnumeration* en,
91            int32_t* resultLength,
92            UErrorCode* status);
93 
94 /**
95  * Function type declaration for uenum_reset().
96  *
97  * This function should reset the enumeration
98  * object
99  *
100  * @param en enumeration
101  * @param status pointer to UErrorCode variable
102  */
103 typedef void U_CALLCONV
104 UEnumReset(UEnumeration* en,
105             UErrorCode* status);
106 
107 
108 struct UEnumeration {
109     /* baseContext. For the base class only. Don't touch! */
110     void *baseContext;
111 
112     /* context. Use it for what you need */
113     void *context;
114 
115     /**
116      * these are functions that will
117      * be used for APIs
118      */
119     /* called from uenum_close */
120     UEnumClose *close;
121     /* called from uenum_count */
122     UEnumCount *count;
123     /* called from uenum_unext */
124     UEnumUNext *uNext;
125     /* called from uenum_next */
126     UEnumNext  *next;
127     /* called from uenum_reset */
128     UEnumReset *reset;
129 };
130 
131 U_CDECL_END
132 
133 /* This is the default implementation for uenum_unext().
134  * It automatically converts the char * string to UChar *.
135  * Don't call this directly.  This is called internally by uenum_unext
136  * when a UEnumeration is defined with 'uNext' pointing to this
137  * function.
138  */
139 U_CAPI const UChar* U_EXPORT2
140 uenum_unextDefault(UEnumeration* en,
141             int32_t* resultLength,
142             UErrorCode* status);
143 
144 /* This is the default implementation for uenum_next().
145  * It automatically converts the UChar * string to char *.
146  * Don't call this directly.  This is called internally by uenum_next
147  * when a UEnumeration is defined with 'next' pointing to this
148  * function.
149  */
150 U_CAPI const char* U_EXPORT2
151 uenum_nextDefault(UEnumeration* en,
152             int32_t* resultLength,
153             UErrorCode* status);
154 
155 #endif
156