244 lines
7.0 KiB
C++
244 lines
7.0 KiB
C++
/*
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********************************************************************************
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* Copyright (C) 1997-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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********************************************************************************
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*
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* File FIELDPOS.H
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*
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* Modification History:
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*
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* Date Name Description
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* 02/25/97 aliu Converted from java.
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* 03/17/97 clhuang Updated per Format implementation.
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* 07/17/98 stephen Added default/copy ctors, and operators =, ==, !=
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********************************************************************************
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*/
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// *****************************************************************************
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// This file was generated from the java source file FieldPosition.java
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// *****************************************************************************
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#ifndef FIELDPOS_H
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#define FIELDPOS_H
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#include "unicode/utypes.h"
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U_NAMESPACE_BEGIN
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/**
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* <code>FieldPosition</code> is a simple class used by <code>Format</code>
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* and its subclasses to identify fields in formatted output. Fields are
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* identified by constants, whose names typically end with <code>_FIELD</code>,
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* defined in the various subclasses of <code>Format</code>. See
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* <code>ERA_FIELD</code> and its friends in <code>DateFormat</code> for
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* an example.
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*
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* <p>
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* <code>FieldPosition</code> keeps track of the position of the
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* field within the formatted output with two indices: the index
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* of the first character of the field and the index of the last
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* character of the field.
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*
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* <p>
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* One version of the <code>format</code> method in the various
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* <code>Format</code> classes requires a <code>FieldPosition</code>
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* object as an argument. You use this <code>format</code> method
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* to perform partial formatting or to get information about the
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* formatted output (such as the position of a field).
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*
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* <p>
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* Below is an example of using <code>FieldPosition</code> to aid
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* alignment of an array of formatted floating-point numbers on
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* their decimal points:
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* <pre>
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* \code
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* double doubleNum[] = {123456789.0, -12345678.9, 1234567.89, -123456.789,
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* 12345.6789, -1234.56789, 123.456789, -12.3456789, 1.23456789};
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* int dNumSize = (int)(sizeof(doubleNum)/sizeof(double));
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*
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* UErrorCode status = U_ZERO_ERROR;
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* DecimalFormat* fmt = (DecimalFormat*) NumberFormat::createInstance(status);
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* fmt->setDecimalSeparatorAlwaysShown(true);
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*
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* const int tempLen = 20;
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* char temp[tempLen];
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*
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* for (int i=0; i<dNumSize; i++) {
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* FieldPosition pos(NumberFormat::INTEGER_FIELD);
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* UnicodeString buf;
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* char fmtText[tempLen];
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* ToCharString(fmt->format(doubleNum[i], buf, pos), fmtText);
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* for (int j=0; j<tempLen; j++) temp[j] = ' '; // clear with spaces
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* temp[__min(tempLen, tempLen-pos.getEndIndex())] = '\0';
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* cout << temp << fmtText << endl;
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* }
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* delete fmt;
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* \endcode
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* </pre>
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* <p>
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* The code will generate the following output:
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* <pre>
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* \code
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* 123,456,789.000
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* -12,345,678.900
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* 1,234,567.880
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* -123,456.789
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* 12,345.678
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* -1,234.567
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* 123.456
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* -12.345
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* 1.234
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* \endcode
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* </pre>
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*/
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class U_I18N_API FieldPosition {
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public:
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/**
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* DONT_CARE may be specified as the field to indicate that the
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* caller doesn't need to specify a field. Do not subclass.
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*/
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enum { DONT_CARE = -1 };
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/**
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* Creates a FieldPosition object with a non-specified field.
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* @stable
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*/
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FieldPosition()
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: fField(DONT_CARE), fBeginIndex(0), fEndIndex(0) {}
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/**
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* Creates a FieldPosition object for the given field. Fields are
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* identified by constants, whose names typically end with _FIELD,
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* in the various subclasses of Format.
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*
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* @see NumberFormat#INTEGER_FIELD
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* @see NumberFormat#FRACTION_FIELD
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* @see DateFormat#YEAR_FIELD
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* @see DateFormat#MONTH_FIELD
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* @stable
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*/
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FieldPosition(int32_t field)
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: fField(field), fBeginIndex(0), fEndIndex(0) {}
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/**
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* Copy constructor
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* @param copy the object to be copied from.
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* @stable
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*/
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FieldPosition(const FieldPosition& copy)
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: fField(copy.fField), fBeginIndex(copy.fBeginIndex), fEndIndex(copy.fEndIndex) {}
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/**
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* Destructor
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* @stable
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*/
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~FieldPosition() {}
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/**
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* Assignment operator
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* @stable
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*/
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FieldPosition& operator=(const FieldPosition& copy);
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/**
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* Equality operator.
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* @return TRUE if the two field positions are equal, FALSE otherwise.
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* @stable
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*/
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UBool operator==(const FieldPosition& that) const;
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/**
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* Equality operator.
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* @return TRUE if the two field positions are not equal, FALSE otherwise.
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* @stable
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*/
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UBool operator!=(const FieldPosition& that) const;
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/**
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* Retrieve the field identifier.
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* @stable
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*/
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int32_t getField(void) const { return fField; }
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/**
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* Retrieve the index of the first character in the requested field.
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* @stable
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*/
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int32_t getBeginIndex(void) const { return fBeginIndex; }
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/**
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* Retrieve the index of the character following the last character in the
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* requested field.
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* @stable
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*/
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int32_t getEndIndex(void) const { return fEndIndex; }
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/**
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* Set the field.
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* @stable
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*/
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void setField(int32_t f) { fField = f; }
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/**
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* Set the begin index. For use by subclasses of Format.
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* @stable
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*/
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void setBeginIndex(int32_t bi) { fBeginIndex = bi; }
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/**
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* Set the end index. For use by subclasses of Format.
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* @stable
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*/
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void setEndIndex(int32_t ei) { fEndIndex = ei; }
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private:
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/**
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* Input: Desired field to determine start and end offsets for.
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* The meaning depends on the subclass of Format.
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*/
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int32_t fField;
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/**
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* Output: Start offset of field in text.
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* If the field does not occur in the text, 0 is returned.
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*/
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int32_t fBeginIndex;
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/**
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* Output: End offset of field in text.
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* If the field does not occur in the text, 0 is returned.
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*/
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int32_t fEndIndex;
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};
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inline FieldPosition&
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FieldPosition::operator=(const FieldPosition& copy)
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{
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fField = copy.fField;
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fEndIndex = copy.fEndIndex;
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fBeginIndex = copy.fBeginIndex;
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return *this;
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}
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inline UBool
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FieldPosition::operator==(const FieldPosition& copy) const
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{
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if( fField != copy.fField ||
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fEndIndex != copy.fEndIndex ||
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fBeginIndex != copy.fBeginIndex)
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return FALSE;
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else
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return TRUE;
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}
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inline UBool
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FieldPosition::operator!=(const FieldPosition& copy) const
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{
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return !operator==(copy);
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}
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U_NAMESPACE_END
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#endif // _FIELDPOS
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//eof
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