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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
********************************************************************************
* Copyright (C) 1997-2006, International Business Machines
* Corporation and others. All Rights Reserved.
********************************************************************************
*
* File FIELDPOS.H
*
* Modification History:
*
* Date Name Description
* 02/25/97 aliu Converted from java.
* 03/17/97 clhuang Updated per Format implementation.
* 07/17/98 stephen Added default/copy ctors, and operators =, ==, !=
********************************************************************************
*/
// *****************************************************************************
// This file was generated from the java source file FieldPosition.java
// *****************************************************************************
#ifndef FIELDPOS_H
#define FIELDPOS_H
#include "unicode/utypes.h"
/**
* \file
* \brief C++ API: FieldPosition identifies the fields in a formatted output.
*/
#if !UCONFIG_NO_FORMATTING
#include "unicode/uobject.h"
U_NAMESPACE_BEGIN
/**
* <code>FieldPosition</code> is a simple class used by <code>Format</code>
* and its subclasses to identify fields in formatted output. Fields are
* identified by constants, whose names typically end with <code>_FIELD</code>,
* defined in the various subclasses of <code>Format</code>. See
* <code>ERA_FIELD</code> and its friends in <code>DateFormat</code> for
* an example.
*
* <p>
* <code>FieldPosition</code> keeps track of the position of the
* field within the formatted output with two indices: the index
* of the first character of the field and the index of the last
* character of the field.
*
* <p>
* One version of the <code>format</code> method in the various
* <code>Format</code> classes requires a <code>FieldPosition</code>
* object as an argument. You use this <code>format</code> method
* to perform partial formatting or to get information about the
* formatted output (such as the position of a field).
*
* The FieldPosition class is not intended for public subclassing.
*
* <p>
* Below is an example of using <code>FieldPosition</code> to aid
* alignment of an array of formatted floating-point numbers on
* their decimal points:
* <pre>
* \code
* double doubleNum[] = {123456789.0, -12345678.9, 1234567.89, -123456.789,
* 12345.6789, -1234.56789, 123.456789, -12.3456789, 1.23456789};
* int dNumSize = (int)(sizeof(doubleNum)/sizeof(double));
*
* UErrorCode status = U_ZERO_ERROR;
* DecimalFormat* fmt = (DecimalFormat*) NumberFormat::createInstance(status);
* fmt->setDecimalSeparatorAlwaysShown(true);
*
* const int tempLen = 20;
* char temp[tempLen];
*
* for (int i=0; i<dNumSize; i++) {
* FieldPosition pos(NumberFormat::INTEGER_FIELD);
* UnicodeString buf;
* char fmtText[tempLen];
* ToCharString(fmt->format(doubleNum[i], buf, pos), fmtText);
* for (int j=0; j<tempLen; j++) temp[j] = ' '; // clear with spaces
* temp[__min(tempLen, tempLen-pos.getEndIndex())] = '\0';
* cout << temp << fmtText << endl;
* }
* delete fmt;
* \endcode
* </pre>
* <p>
* The code will generate the following output:
* <pre>
* \code
* 123,456,789.000
* -12,345,678.900
* 1,234,567.880
* -123,456.789
* 12,345.678
* -1,234.567
* 123.456
* -12.345
* 1.234
* \endcode
* </pre>
*/
class U_I18N_API FieldPosition : public UObject {
public:
/**
* DONT_CARE may be specified as the field to indicate that the
* caller doesn't need to specify a field.
* @stable ICU 2.0
*/
enum { DONT_CARE = -1 };
/**
* Creates a FieldPosition object with a non-specified field.
* @stable ICU 2.0
*/
FieldPosition()
: UObject(), fField(DONT_CARE), fBeginIndex(0), fEndIndex(0) {}
/**
* Creates a FieldPosition object for the given field. Fields are
* identified by constants, whose names typically end with _FIELD,
* in the various subclasses of Format.
*
* @see NumberFormat#INTEGER_FIELD
* @see NumberFormat#FRACTION_FIELD
* @see DateFormat#YEAR_FIELD
* @see DateFormat#MONTH_FIELD
* @stable ICU 2.0
*/
FieldPosition(int32_t field)
: UObject(), fField(field), fBeginIndex(0), fEndIndex(0) {}
/**
* Copy constructor
* @param copy the object to be copied from.
* @stable ICU 2.0
*/
FieldPosition(const FieldPosition& copy)
: UObject(copy), fField(copy.fField), fBeginIndex(copy.fBeginIndex), fEndIndex(copy.fEndIndex) {}
/**
* Destructor
* @stable ICU 2.0
*/
virtual ~FieldPosition();
/**
* Assignment operator
* @param copy the object to be copied from.
* @stable ICU 2.0
*/
FieldPosition& operator=(const FieldPosition& copy);
/**
* Equality operator.
* @param that the object to be compared with.
* @return TRUE if the two field positions are equal, FALSE otherwise.
* @stable ICU 2.0
*/
UBool operator==(const FieldPosition& that) const;
/**
* Equality operator.
* @param that the object to be compared with.
* @return TRUE if the two field positions are not equal, FALSE otherwise.
* @stable ICU 2.0
*/
UBool operator!=(const FieldPosition& that) const;
/**
* Clone this object.
* Clones can be used concurrently in multiple threads.
* If an error occurs, then NULL is returned.
* The caller must delete the clone.
*
* @return a clone of this object
*
* @see getDynamicClassID
* @stable ICU 2.8
*/
FieldPosition *clone() const;
/**
* Retrieve the field identifier.
* @return the field identifier.
* @stable ICU 2.0
*/
int32_t getField(void) const { return fField; }
/**
* Retrieve the index of the first character in the requested field.
* @return the index of the first character in the requested field.
* @stable ICU 2.0
*/
int32_t getBeginIndex(void) const { return fBeginIndex; }
/**
* Retrieve the index of the character following the last character in the
* requested field.
* @return the index of the character following the last character in the
* requested field.
* @stable ICU 2.0
*/
int32_t getEndIndex(void) const { return fEndIndex; }
/**
* Set the field.
* @param f the new value of the field.
* @stable ICU 2.0
*/
void setField(int32_t f) { fField = f; }
/**
* Set the begin index. For use by subclasses of Format.
* @param bi the new value of the begin index
* @stable ICU 2.0
*/
void setBeginIndex(int32_t bi) { fBeginIndex = bi; }
/**
* Set the end index. For use by subclasses of Format.
* @param ei the new value of the end index
* @stable ICU 2.0
*/
void setEndIndex(int32_t ei) { fEndIndex = ei; }
/**
* ICU "poor man's RTTI", returns a UClassID for the actual class.
*
* @stable ICU 2.2
*/
virtual UClassID getDynamicClassID() const;
/**
* ICU "poor man's RTTI", returns a UClassID for this class.
*
* @stable ICU 2.2
*/
static UClassID U_EXPORT2 getStaticClassID();
private:
/**
* Input: Desired field to determine start and end offsets for.
* The meaning depends on the subclass of Format.
*/
int32_t fField;
/**
* Output: Start offset of field in text.
* If the field does not occur in the text, 0 is returned.
*/
int32_t fBeginIndex;
/**
* Output: End offset of field in text.
* If the field does not occur in the text, 0 is returned.
*/
int32_t fEndIndex;
};
inline FieldPosition&
FieldPosition::operator=(const FieldPosition& copy)
{
fField = copy.fField;
fEndIndex = copy.fEndIndex;
fBeginIndex = copy.fBeginIndex;
return *this;
}
inline UBool
FieldPosition::operator==(const FieldPosition& copy) const
{
return (fField == copy.fField &&
fEndIndex == copy.fEndIndex &&
fBeginIndex == copy.fBeginIndex);
}
inline UBool
FieldPosition::operator!=(const FieldPosition& copy) const
{
return !operator==(copy);
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif // _FIELDPOS
//eof
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