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comparison: intl/icu/source/i18n/unicode/compactdecimalformat.h

intl/icu/source/i18n/unicode/compactdecimalformat.h

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1 /*
2 ********************************************************************************
3 * Copyright (C) 2012-2013, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 ********************************************************************************
6 *
7 * File COMPACTDECIMALFORMAT.H
8 ********************************************************************************
9 */
10
11 #ifndef __COMPACT_DECIMAL_FORMAT_H__
12 #define __COMPACT_DECIMAL_FORMAT_H__
13
14 #include "unicode/utypes.h"
15 /**
16 * \file
17 * \brief C++ API: Formats decimal numbers in compact form.
18 */
19
20 #if !UCONFIG_NO_FORMATTING
21 #ifndef U_HIDE_DRAFT_API
22
23 #include "unicode/decimfmt.h"
24
25 struct UHashtable;
26
27 U_NAMESPACE_BEGIN
28
29 class PluralRules;
30
31 /**
32 * The CompactDecimalFormat produces abbreviated numbers, suitable for display in
33 * environments will limited real estate. For example, 'Hits: 1.2B' instead of
34 * 'Hits: 1,200,000,000'. The format will be appropriate for the given language,
35 * such as "1,2 Mrd." for German.
36 * <p>
37 * For numbers under 1000 trillion (under 10^15, such as 123,456,789,012,345),
38 * the result will be short for supported languages. However, the result may
39 * sometimes exceed 7 characters, such as when there are combining marks or thin
40 * characters. In such cases, the visual width in fonts should still be short.
41 * <p>
42 * By default, there are 3 significant digits. After creation, if more than
43 * three significant digits are set (with setMaximumSignificantDigits), or if a
44 * fixed number of digits are set (with setMaximumIntegerDigits or
45 * setMaximumFractionDigits), then result may be wider.
46 * <p>
47 * At this time, parsing is not supported, and will produce a U_UNSUPPORTED_ERROR.
48 * Resetting the pattern prefixes or suffixes is not supported; the method calls
49 * are ignored.
50 * <p>
51 * @draft ICU 51
52 */
53 class U_I18N_API CompactDecimalFormat : public DecimalFormat {
54 public:
55
56 /**
57 * Returns a compact decimal instance for specified locale.
58 * @param inLocale the given locale.
59 * @param style whether to use short or long style.
60 * @param status error code returned here.
61 * @draft ICU 51
62 */
63 static CompactDecimalFormat* U_EXPORT2 createInstance(
64 const Locale& inLocale, UNumberCompactStyle style, UErrorCode& status);
65
66 /**
67 * Copy constructor.
68 *
69 * @param source the DecimalFormat object to be copied from.
70 * @draft ICU 51
71 */
72 CompactDecimalFormat(const CompactDecimalFormat& source);
73
74 /**
75 * Destructor.
76 * @draft ICU 51
77 */
78 virtual ~CompactDecimalFormat();
79
80 /**
81 * Assignment operator.
82 *
83 * @param rhs the DecimalFormat object to be copied.
84 * @draft ICU 51
85 */
86 CompactDecimalFormat& operator=(const CompactDecimalFormat& rhs);
87
88 /**
89 * Clone this Format object polymorphically. The caller owns the
90 * result and should delete it when done.
91 *
92 * @return a polymorphic copy of this CompactDecimalFormat.
93 * @draft ICU 51
94 */
95 virtual Format* clone() const;
96
97 /**
98 * Return TRUE if the given Format objects are semantically equal.
99 * Objects of different subclasses are considered unequal.
100 *
101 * @param other the object to be compared with.
102 * @return TRUE if the given Format objects are semantically equal.
103 * @draft ICU 51
104 */
105 virtual UBool operator==(const Format& other) const;
106
107
108 using DecimalFormat::format;
109
110 /**
111 * Format a double or long number using base-10 representation.
112 *
113 * @param number The value to be formatted.
114 * @param appendTo Output parameter to receive result.
115 * Result is appended to existing contents.
116 * @param pos On input: an alignment field, if desired.
117 * On output: the offsets of the alignment field.
118 * @return Reference to 'appendTo' parameter.
119 * @draft ICU 51
120 */
121 virtual UnicodeString& format(double number,
122 UnicodeString& appendTo,
123 FieldPosition& pos) const;
124
125 /**
126 * Format a double or long number using base-10 representation.
127 * Currently sets status to U_UNSUPPORTED_ERROR.
128 *
129 * @param number The value to be formatted.
130 * @param appendTo Output parameter to receive result.
131 * Result is appended to existing contents.
132 * @param posIter On return, can be used to iterate over positions
133 * of fields generated by this format call.
134 * Can be NULL.
135 * @param status Output param filled with success/failure status.
136 * @return Reference to 'appendTo' parameter.
137 * @internal
138 */
139 virtual UnicodeString& format(double number,
140 UnicodeString& appendTo,
141 FieldPositionIterator* posIter,
142 UErrorCode& status) const;
143
144 /**
145 * Format an int64 number using base-10 representation.
146 *
147 * @param number The value to be formatted.
148 * @param appendTo Output parameter to receive result.
149 * Result is appended to existing contents.
150 * @param pos On input: an alignment field, if desired.
151 * On output: the offsets of the alignment field.
152 * @return Reference to 'appendTo' parameter.
153 * @draft ICU 51
154 */
155 virtual UnicodeString& format(int64_t number,
156 UnicodeString& appendTo,
157 FieldPosition& pos) const;
158
159 /**
160 * Format an int64 number using base-10 representation.
161 * Currently sets status to U_UNSUPPORTED_ERROR
162 *
163 * @param number The value to be formatted.
164 * @param appendTo Output parameter to receive result.
165 * Result is appended to existing contents.
166 * @param posIter On return, can be used to iterate over positions
167 * of fields generated by this format call.
168 * Can be NULL.
169 * @param status Output param filled with success/failure status.
170 * @return Reference to 'appendTo' parameter.
171 * @internal
172 */
173 virtual UnicodeString& format(int64_t number,
174 UnicodeString& appendTo,
175 FieldPositionIterator* posIter,
176 UErrorCode& status) const;
177
178 /**
179 * Format a decimal number. Currently sets status to U_UNSUPPORTED_ERROR
180 * The syntax of the unformatted number is a "numeric string"
181 * as defined in the Decimal Arithmetic Specification, available at
182 * http://speleotrove.com/decimal
183 *
184 * @param number The unformatted number, as a string.
185 * @param appendTo Output parameter to receive result.
186 * Result is appended to existing contents.
187 * @param posIter On return, can be used to iterate over positions
188 * of fields generated by this format call.
189 * Can be NULL.
190 * @param status Output param filled with success/failure status.
191 * @return Reference to 'appendTo' parameter.
192 * @internal
193 */
194 virtual UnicodeString& format(const StringPiece &number,
195 UnicodeString& appendTo,
196 FieldPositionIterator* posIter,
197 UErrorCode& status) const;
198
199 /**
200 * Format a decimal number. Currently sets status to U_UNSUPPORTED_ERROR
201 * The number is a DigitList wrapper onto a floating point decimal number.
202 * The default implementation in NumberFormat converts the decimal number
203 * to a double and formats that.
204 *
205 * @param number The number, a DigitList format Decimal Floating Point.
206 * @param appendTo Output parameter to receive result.
207 * Result is appended to existing contents.
208 * @param posIter On return, can be used to iterate over positions
209 * of fields generated by this format call.
210 * @param status Output param filled with success/failure status.
211 * @return Reference to 'appendTo' parameter.
212 * @internal
213 */
214 virtual UnicodeString& format(const DigitList &number,
215 UnicodeString& appendTo,
216 FieldPositionIterator* posIter,
217 UErrorCode& status) const;
218
219 /**
220 * Format a decimal number. Currently sets status to U_UNSUPPORTED_ERROR.
221 * The number is a DigitList wrapper onto a floating point decimal number.
222 * The default implementation in NumberFormat converts the decimal number
223 * to a double and formats that.
224 *
225 * @param number The number, a DigitList format Decimal Floating Point.
226 * @param appendTo Output parameter to receive result.
227 * Result is appended to existing contents.
228 * @param pos On input: an alignment field, if desired.
229 * On output: the offsets of the alignment field.
230 * @param status Output param filled with success/failure status.
231 * @return Reference to 'appendTo' parameter.
232 * @internal
233 */
234 virtual UnicodeString& format(const DigitList &number,
235 UnicodeString& appendTo,
236 FieldPosition& pos,
237 UErrorCode& status) const;
238
239 /**
240 * CompactDecimalFormat does not support parsing. This implementation
241 * does nothing.
242 * @param text Unused.
243 * @param result Does not change.
244 * @param parsePosition Does not change.
245 * @see Formattable
246 * @draft ICU 51
247 */
248 virtual void parse(const UnicodeString& text,
249 Formattable& result,
250 ParsePosition& parsePosition) const;
251
252 /**
253 * CompactDecimalFormat does not support parsing. This implementation
254 * sets status to U_UNSUPPORTED_ERROR
255 *
256 * @param text Unused.
257 * @param result Does not change.
258 * @param status Always set to U_UNSUPPORTED_ERROR.
259 * @draft ICU 51
260 */
261 virtual void parse(const UnicodeString& text,
262 Formattable& result,
263 UErrorCode& status) const;
264
265 /* Cannot use #ifndef U_HIDE_INTERNAL_API for the following draft method since it is virtual */
266 /**
267 * Parses text from the given string as a currency amount. Unlike
268 * the parse() method, this method will attempt to parse a generic
269 * currency name, searching for a match of this object's locale's
270 * currency display names, or for a 3-letter ISO currency code.
271 * This method will fail if this format is not a currency format,
272 * that is, if it does not contain the currency pattern symbol
273 * (U+00A4) in its prefix or suffix. This implementation always returns
274 * NULL.
275 *
276 * @param text the string to parse
277 * @param pos input-output position; on input, the position within text
278 * to match; must have 0 <= pos.getIndex() < text.length();
279 * on output, the position after the last matched character.
280 * If the parse fails, the position in unchanged upon output.
281 * @return if parse succeeds, a pointer to a newly-created CurrencyAmount
282 * object (owned by the caller) containing information about
283 * the parsed currency; if parse fails, this is NULL.
284 * @internal
285 */
286 virtual CurrencyAmount* parseCurrency(const UnicodeString& text,
287 ParsePosition& pos) const;
288
289 /**
290 * Return the class ID for this class. This is useful only for
291 * comparing to a return value from getDynamicClassID(). For example:
292 * <pre>
293 * . Base* polymorphic_pointer = createPolymorphicObject();
294 * . if (polymorphic_pointer->getDynamicClassID() ==
295 * . Derived::getStaticClassID()) ...
296 * </pre>
297 * @return The class ID for all objects of this class.
298 * @draft ICU 51
299 */
300 static UClassID U_EXPORT2 getStaticClassID();
301
302 /**
303 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override.
304 * This method is to implement a simple version of RTTI, since not all
305 * C++ compilers support genuine RTTI. Polymorphic operator==() and
306 * clone() methods call this method.
307 *
308 * @return The class ID for this object. All objects of a
309 * given class have the same class ID. Objects of
310 * other classes have different class IDs.
311 * @draft ICU 51
312 */
313 virtual UClassID getDynamicClassID() const;
314
315 private:
316
317 const UHashtable* _unitsByVariant;
318 const double* _divisors;
319 PluralRules* _pluralRules;
320
321 // Default constructor not implemented.
322 CompactDecimalFormat(const DecimalFormat &, const UHashtable* unitsByVariant, const double* divisors, PluralRules* pluralRules);
323
324 UBool eqHelper(const CompactDecimalFormat& that) const;
325 };
326
327 U_NAMESPACE_END
328
329 #endif /* U_HIDE_DRAFT_API */
330 #endif /* #if !UCONFIG_NO_FORMATTING */
331
332 #endif // __COMPACT_DECIMAL_FORMAT_H__
333 //eof

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