icuSources/i18n/unicode/fieldpos.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4  ********************************************************************************
   5  *   Copyright (C) 1997-2006, International Business Machines
   6  *   Corporation and others.  All Rights Reserved.
   7  ********************************************************************************
   8  *
   9  * File FIELDPOS.H
  10  *
  11  * Modification History:
  12  *
  13  *   Date        Name        Description
  14  *   02/25/97    aliu        Converted from java.
  15  *   03/17/97    clhuang     Updated per Format implementation.
  16  *    07/17/98    stephen        Added default/copy ctors, and operators =, ==, !=
  17  ********************************************************************************
  18  */
  19
  20 // *****************************************************************************
  21 // This file was generated from the java source file FieldPosition.java
  22 // *****************************************************************************
  23
  24 #ifndef FIELDPOS_H
  25 #define FIELDPOS_H
  26
  27 #include "unicode/utypes.h"
  28
  29 #if U_SHOW_CPLUSPLUS_API
  30
  31 /**
  32  * \file
  33  * \brief C++ API: FieldPosition identifies the fields in a formatted output.
  34  */
  35
  36 #if !UCONFIG_NO_FORMATTING
  37
  38 #include "unicode/uobject.h"
  39
  40 U_NAMESPACE_BEGIN
  41
  42 /**
  43  * <code>FieldPosition</code> is a simple class used by <code>Format</code>
  44  * and its subclasses to identify fields in formatted output. Fields are
  45  * identified by constants, whose names typically end with <code>_FIELD</code>,
  46  * defined in the various subclasses of <code>Format</code>. See
  47  * <code>ERA_FIELD</code> and its friends in <code>DateFormat</code> for
  48  * an example.
  49  *
  50  * <p>
  51  * <code>FieldPosition</code> keeps track of the position of the
  52  * field within the formatted output with two indices: the index
  53  * of the first character of the field and the index of the last
  54  * character of the field.
  55  *
  56  * <p>
  57  * One version of the <code>format</code> method in the various
  58  * <code>Format</code> classes requires a <code>FieldPosition</code>
  59  * object as an argument. You use this <code>format</code> method
  60  * to perform partial formatting or to get information about the
  61  * formatted output (such as the position of a field).
  62  *
  63  * The FieldPosition class is not intended for public subclassing.
  64  *
  65  * <p>
  66  * Below is an example of using <code>FieldPosition</code> to aid
  67  * alignment of an array of formatted floating-point numbers on
  68  * their decimal points:
  69  * <pre>
  70  * \code
  71  *       double doubleNum[] = {123456789.0, -12345678.9, 1234567.89, -123456.789,
  72  *                  12345.6789, -1234.56789, 123.456789, -12.3456789, 1.23456789};
  73  *       int dNumSize = (int)(sizeof(doubleNum)/sizeof(double));
  74  *
  75  *       UErrorCode status = U_ZERO_ERROR;
  76  *       DecimalFormat* fmt = (DecimalFormat*) NumberFormat::createInstance(status);
  77  *       fmt->setDecimalSeparatorAlwaysShown(true);
  78  *
  79  *       const int tempLen = 20;
  80  *       char temp[tempLen];
  81  *
  82  *       for (int i=0; i<dNumSize; i++) {
  83  *           FieldPosition pos(NumberFormat::INTEGER_FIELD);
  84  *           UnicodeString buf;
  85  *           char fmtText[tempLen];
  86  *           ToCharString(fmt->format(doubleNum[i], buf, pos), fmtText);
  87  *           for (int j=0; j<tempLen; j++) temp[j] = ' '; // clear with spaces
  88  *           temp[__min(tempLen, tempLen-pos.getEndIndex())] = '\0';
  89  *           cout << temp << fmtText   << endl;
  90  *       }
  91  *       delete fmt;
  92  * \endcode
  93  * </pre>
  94  * <p>
  95  * The code will generate the following output:
  96  * <pre>
  97  * \code
  98  *           123,456,789.000
  99  *           -12,345,678.900
 100  *             1,234,567.880
 101  *              -123,456.789
 102  *                12,345.678
 103  *                -1,234.567
 104  *                   123.456
 105  *                   -12.345
 106  *                     1.234
 107  *  \endcode
 108  * </pre>
 109  */
 110 class U_I18N_API FieldPosition : public UObject {
 111 public:
 112     /**
 113      * DONT_CARE may be specified as the field to indicate that the
 114      * caller doesn't need to specify a field.
 115      * @stable ICU 2.0
 116      */
 117     enum { DONT_CARE = -1 };
 118
 119     /**
 120      * Creates a FieldPosition object with a non-specified field.
 121      * @stable ICU 2.0
 122      */
 123     FieldPosition()
 124         : UObject(), fField(DONT_CARE), fBeginIndex(0), fEndIndex(0) {}
 125
 126     /**
 127      * Creates a FieldPosition object for the given field.  Fields are
 128      * identified by constants, whose names typically end with _FIELD,
 129      * in the various subclasses of Format.
 130      *
 131      * @see NumberFormat#INTEGER_FIELD
 132      * @see NumberFormat#FRACTION_FIELD
 133      * @see DateFormat#YEAR_FIELD
 134      * @see DateFormat#MONTH_FIELD
 135      * @stable ICU 2.0
 136      */
 137     FieldPosition(int32_t field)
 138         : UObject(), fField(field), fBeginIndex(0), fEndIndex(0) {}
 139
 140     /**
 141      * Copy constructor
 142      * @param copy the object to be copied from.
 143      * @stable ICU 2.0
 144      */
 145     FieldPosition(const FieldPosition& copy)
 146         : UObject(copy), fField(copy.fField), fBeginIndex(copy.fBeginIndex), fEndIndex(copy.fEndIndex) {}
 147
 148     /**
 149      * Destructor
 150      * @stable ICU 2.0
 151      */
 152     virtual ~FieldPosition();
 153
 154     /**
 155      * Assignment operator
 156      * @param copy the object to be copied from.
 157      * @stable ICU 2.0
 158      */
 159     FieldPosition&      operator=(const FieldPosition& copy);
 160
 161     /**
 162      * Equality operator.
 163      * @param that    the object to be compared with.
 164      * @return        TRUE if the two field positions are equal, FALSE otherwise.
 165      * @stable ICU 2.0
 166      */
 167     UBool              operator==(const FieldPosition& that) const;
 168
 169     /**
 170      * Equality operator.
 171      * @param that    the object to be compared with.
 172      * @return        TRUE if the two field positions are not equal, FALSE otherwise.
 173      * @stable ICU 2.0
 174      */
 175     UBool              operator!=(const FieldPosition& that) const;
 176
 177     /**
 178      * Clone this object.
 179      * Clones can be used concurrently in multiple threads.
 180      * If an error occurs, then NULL is returned.
 181      * The caller must delete the clone.
 182      *
 183      * @return a clone of this object
 184      *
 185      * @see getDynamicClassID
 186      * @stable ICU 2.8
 187      */
 188     FieldPosition *clone() const;
 189
 190     /**
 191      * Retrieve the field identifier.
 192      * @return    the field identifier.
 193      * @stable ICU 2.0
 194      */
 195     int32_t getField(void) const { return fField; }
 196
 197     /**
 198      * Retrieve the index of the first character in the requested field.
 199      * @return    the index of the first character in the requested field.
 200      * @stable ICU 2.0
 201      */
 202     int32_t getBeginIndex(void) const { return fBeginIndex; }
 203
 204     /**
 205      * Retrieve the index of the character following the last character in the
 206      * requested field.
 207      * @return    the index of the character following the last character in the
 208      *            requested field.
 209      * @stable ICU 2.0
 210      */
 211     int32_t getEndIndex(void) const { return fEndIndex; }
 212
 213     /**
 214      * Set the field.
 215      * @param f    the new value of the field.
 216      * @stable ICU 2.0
 217      */
 218     void setField(int32_t f) { fField = f; }
 219
 220     /**
 221      * Set the begin index.  For use by subclasses of Format.
 222      * @param bi    the new value of the begin index
 223      * @stable ICU 2.0
 224      */
 225     void setBeginIndex(int32_t bi) { fBeginIndex = bi; }
 226
 227     /**
 228      * Set the end index.  For use by subclasses of Format.
 229      * @param ei    the new value of the end index
 230      * @stable ICU 2.0
 231      */
 232     void setEndIndex(int32_t ei) { fEndIndex = ei; }
 233
 234     /**
 235      * ICU "poor man's RTTI", returns a UClassID for the actual class.
 236      *
 237      * @stable ICU 2.2
 238      */
 239     virtual UClassID getDynamicClassID() const;
 240
 241     /**
 242      * ICU "poor man's RTTI", returns a UClassID for this class.
 243      *
 244      * @stable ICU 2.2
 245      */
 246     static UClassID U_EXPORT2 getStaticClassID();
 247
 248 private:
 249     /**
 250      * Input: Desired field to determine start and end offsets for.
 251      * The meaning depends on the subclass of Format.
 252      */
 253     int32_t fField;
 254
 255     /**
 256      * Output: Start offset of field in text.
 257      * If the field does not occur in the text, 0 is returned.
 258      */
 259     int32_t fBeginIndex;
 260
 261     /**
 262      * Output: End offset of field in text.
 263      * If the field does not occur in the text, 0 is returned.
 264      */
 265     int32_t fEndIndex;
 266 };
 267
 268 inline FieldPosition&
 269 FieldPosition::operator=(const FieldPosition& copy)
 270 {
 271     fField         = copy.fField;
 272     fEndIndex     = copy.fEndIndex;
 273     fBeginIndex = copy.fBeginIndex;
 274     return *this;
 275 }
 276
 277 inline UBool
 278 FieldPosition::operator==(const FieldPosition& copy) const
 279 {
 280     return (fField == copy.fField &&
 281         fEndIndex == copy.fEndIndex &&
 282         fBeginIndex == copy.fBeginIndex);
 283 }
 284
 285 inline UBool
 286 FieldPosition::operator!=(const FieldPosition& copy) const
 287 {
 288     return !operator==(copy);
 289 }
 290
 291 U_NAMESPACE_END
 292
 293 #endif /* #if !UCONFIG_NO_FORMATTING */
 294
 295 #endif /* U_SHOW_CPLUSPLUS_API */
 296
 297 #endif // _FIELDPOS
 298 //eof