1 : /*
2 : ********************************************************************************
3 : * Copyright (C) 1997-2005, International Business Machines
4 : * Corporation and others. All Rights Reserved.
5 : ********************************************************************************
6 : *
7 : * File FIELDPOS.H
8 : *
9 : * Modification History:
10 : *
11 : * Date Name Description
12 : * 02/25/97 aliu Converted from java.
13 : * 03/17/97 clhuang Updated per Format implementation.
14 : * 07/17/98 stephen Added default/copy ctors, and operators =, ==, !=
15 : ********************************************************************************
16 : */
17 :
18 : // *****************************************************************************
19 : // This file was generated from the java source file FieldPosition.java
20 : // *****************************************************************************
21 :
22 : #ifndef FIELDPOS_H
23 : #define FIELDPOS_H
24 :
25 : #include "unicode/utypes.h"
26 :
27 : /**
28 : * \file
29 : * \brief C++ API: FieldPosition identifies the fields in a formatted output.
30 : */
31 :
32 : #if !UCONFIG_NO_FORMATTING
33 :
34 : #include "unicode/uobject.h"
35 :
36 : U_NAMESPACE_BEGIN
37 :
38 : /**
39 : * <code>FieldPosition</code> is a simple class used by <code>Format</code>
40 : * and its subclasses to identify fields in formatted output. Fields are
41 : * identified by constants, whose names typically end with <code>_FIELD</code>,
42 : * defined in the various subclasses of <code>Format</code>. See
43 : * <code>ERA_FIELD</code> and its friends in <code>DateFormat</code> for
44 : * an example.
45 : *
46 : * <p>
47 : * <code>FieldPosition</code> keeps track of the position of the
48 : * field within the formatted output with two indices: the index
49 : * of the first character of the field and the index of the last
50 : * character of the field.
51 : *
52 : * <p>
53 : * One version of the <code>format</code> method in the various
54 : * <code>Format</code> classes requires a <code>FieldPosition</code>
55 : * object as an argument. You use this <code>format</code> method
56 : * to perform partial formatting or to get information about the
57 : * formatted output (such as the position of a field).
58 : *
59 : * The FieldPosition class is not suitable for subclassing.
60 : *
61 : * <p>
62 : * Below is an example of using <code>FieldPosition</code> to aid
63 : * alignment of an array of formatted floating-point numbers on
64 : * their decimal points:
65 : * <pre>
66 : * \code
67 : * double doubleNum[] = {123456789.0, -12345678.9, 1234567.89, -123456.789,
68 : * 12345.6789, -1234.56789, 123.456789, -12.3456789, 1.23456789};
69 : * int dNumSize = (int)(sizeof(doubleNum)/sizeof(double));
70 : *
71 : * UErrorCode status = U_ZERO_ERROR;
72 : * DecimalFormat* fmt = (DecimalFormat*) NumberFormat::createInstance(status);
73 : * fmt->setDecimalSeparatorAlwaysShown(true);
74 : *
75 : * const int tempLen = 20;
76 : * char temp[tempLen];
77 : *
78 : * for (int i=0; i<dNumSize; i++) {
79 : * FieldPosition pos(NumberFormat::INTEGER_FIELD);
80 : * UnicodeString buf;
81 : * char fmtText[tempLen];
82 : * ToCharString(fmt->format(doubleNum[i], buf, pos), fmtText);
83 : * for (int j=0; j<tempLen; j++) temp[j] = ' '; // clear with spaces
84 : * temp[__min(tempLen, tempLen-pos.getEndIndex())] = '\0';
85 : * cout << temp << fmtText << endl;
86 : * }
87 : * delete fmt;
88 : * \endcode
89 : * </pre>
90 : * <p>
91 : * The code will generate the following output:
92 : * <pre>
93 : * \code
94 : * 123,456,789.000
95 : * -12,345,678.900
96 : * 1,234,567.880
97 : * -123,456.789
98 : * 12,345.678
99 : * -1,234.567
100 : * 123.456
101 : * -12.345
102 : * 1.234
103 : * \endcode
104 : * </pre>
105 : */
106 : class U_I18N_API FieldPosition : public UObject {
107 : public:
108 : /**
109 : * DONT_CARE may be specified as the field to indicate that the
110 : * caller doesn't need to specify a field. Do not subclass.
111 : */
112 : enum { DONT_CARE = -1 };
113 :
114 : /**
115 : * Creates a FieldPosition object with a non-specified field.
116 : * @stable ICU 2.0
117 : */
118 : FieldPosition()
119 : : UObject(), fField(DONT_CARE), fBeginIndex(0), fEndIndex(0) {}
120 :
121 : /**
122 : * Creates a FieldPosition object for the given field. Fields are
123 : * identified by constants, whose names typically end with _FIELD,
124 : * in the various subclasses of Format.
125 : *
126 : * @see NumberFormat#INTEGER_FIELD
127 : * @see NumberFormat#FRACTION_FIELD
128 : * @see DateFormat#YEAR_FIELD
129 : * @see DateFormat#MONTH_FIELD
130 : * @stable ICU 2.0
131 : */
132 26 : FieldPosition(int32_t field)
133 26 : : UObject(), fField(field), fBeginIndex(0), fEndIndex(0) {}
134 :
135 : /**
136 : * Copy constructor
137 : * @param copy the object to be copied from.
138 : * @stable ICU 2.0
139 : */
140 : FieldPosition(const FieldPosition& copy)
141 : : UObject(copy), fField(copy.fField), fBeginIndex(copy.fBeginIndex), fEndIndex(copy.fEndIndex) {}
142 :
143 : /**
144 : * Destructor
145 : * @stable ICU 2.0
146 : */
147 : virtual ~FieldPosition();
148 :
149 : /**
150 : * Assignment operator
151 : * @param copy the object to be copied from.
152 : * @stable ICU 2.0
153 : */
154 : FieldPosition& operator=(const FieldPosition& copy);
155 :
156 : /**
157 : * Equality operator.
158 : * @param that the object to be compared with.
159 : * @return TRUE if the two field positions are equal, FALSE otherwise.
160 : * @stable ICU 2.0
161 : */
162 : UBool operator==(const FieldPosition& that) const;
163 :
164 : /**
165 : * Equality operator.
166 : * @param that the object to be compared with.
167 : * @return TRUE if the two field positions are not equal, FALSE otherwise.
168 : * @stable ICU 2.0
169 : */
170 : UBool operator!=(const FieldPosition& that) const;
171 :
172 : /**
173 : * Clone this object.
174 : * Clones can be used concurrently in multiple threads.
175 : * If an error occurs, then NULL is returned.
176 : * The caller must delete the clone.
177 : *
178 : * @return a clone of this object
179 : *
180 : * @see getDynamicClassID
181 : * @stable ICU 2.8
182 : */
183 : FieldPosition *clone() const;
184 :
185 : /**
186 : * Retrieve the field identifier.
187 : * @return the field identifier.
188 : * @stable ICU 2.0
189 : */
190 : int32_t getField(void) const { return fField; }
191 :
192 : /**
193 : * Retrieve the index of the first character in the requested field.
194 : * @return the index of the first character in the requested field.
195 : * @stable ICU 2.0
196 : */
197 : int32_t getBeginIndex(void) const { return fBeginIndex; }
198 :
199 : /**
200 : * Retrieve the index of the character following the last character in the
201 : * requested field.
202 : * @return the index of the character following the last character in the
203 : * requested field.
204 : * @stable ICU 2.0
205 : */
206 : int32_t getEndIndex(void) const { return fEndIndex; }
207 :
208 : /**
209 : * Set the field.
210 : * @param f the new value of the field.
211 : * @stable ICU 2.0
212 : */
213 : void setField(int32_t f) { fField = f; }
214 :
215 : /**
216 : * Set the begin index. For use by subclasses of Format.
217 : * @param bi the new value of the begin index
218 : * @stable ICU 2.0
219 : */
220 : void setBeginIndex(int32_t bi) { fBeginIndex = bi; }
221 :
222 : /**
223 : * Set the end index. For use by subclasses of Format.
224 : * @param ei the new value of the end index
225 : * @stable ICU 2.0
226 : */
227 : void setEndIndex(int32_t ei) { fEndIndex = ei; }
228 :
229 : /**
230 : * ICU "poor man's RTTI", returns a UClassID for the actual class.
231 : *
232 : * @stable ICU 2.2
233 : */
234 : virtual UClassID getDynamicClassID() const;
235 :
236 : /**
237 : * ICU "poor man's RTTI", returns a UClassID for this class.
238 : *
239 : * @stable ICU 2.2
240 : */
241 : static UClassID U_EXPORT2 getStaticClassID();
242 :
243 : private:
244 : /**
245 : * Input: Desired field to determine start and end offsets for.
246 : * The meaning depends on the subclass of Format.
247 : */
248 : int32_t fField;
249 :
250 : /**
251 : * Output: Start offset of field in text.
252 : * If the field does not occur in the text, 0 is returned.
253 : */
254 : int32_t fBeginIndex;
255 :
256 : /**
257 : * Output: End offset of field in text.
258 : * If the field does not occur in the text, 0 is returned.
259 : */
260 : int32_t fEndIndex;
261 : };
262 :
263 : inline FieldPosition&
264 : FieldPosition::operator=(const FieldPosition& copy)
265 : {
266 : fField = copy.fField;
267 : fEndIndex = copy.fEndIndex;
268 : fBeginIndex = copy.fBeginIndex;
269 : return *this;
270 : }
271 :
272 : inline UBool
273 : FieldPosition::operator==(const FieldPosition& copy) const
274 : {
275 : if( fField != copy.fField ||
276 : fEndIndex != copy.fEndIndex ||
277 : fBeginIndex != copy.fBeginIndex)
278 : return FALSE;
279 : else
280 : return TRUE;
281 : }
282 :
283 : inline UBool
284 : FieldPosition::operator!=(const FieldPosition& copy) const
285 : {
286 : return !operator==(copy);
287 : }
288 :
289 : U_NAMESPACE_END
290 :
291 : #endif /* #if !UCONFIG_NO_FORMATTING */
292 :
293 : #endif // _FIELDPOS
294 : //eof
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