472 lines
14 KiB
C++
472 lines
14 KiB
C++
/*
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********************************************************************************
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* Copyright (C) 1997-2003, 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 FMTABLE.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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* 02/29/97 aliu Creation.
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********************************************************************************
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*/
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#ifndef FMTABLE_H
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#define FMTABLE_H
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/unistr.h"
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#include "unicode/utypes.h"
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U_NAMESPACE_BEGIN
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/**
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* Formattable objects can be passed to the Format class or
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* its subclasses for formatting. Formattable is a thin wrapper
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* class which interconverts between the primitive numeric types
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* (double, long, etc.) as well as UDate and UnicodeString.
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* <P>
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* Note that this is fundamentally different from the Java behavior, since
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* in this case the various formattable objects do not occupy a hierarchy,
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* but are all wrapped within this one class. Formattable encapsulates all
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* the polymorphism in itself.
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* <P>
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* It would be easy to change this so that Formattable was an abstract base
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* class of a genuine hierarchy, and that would clean up the code that
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* currently must explicitly check for type, but that seems like overkill at
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* this point.
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*/
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class U_I18N_API Formattable : public UObject {
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public:
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/**
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* This enum is only used to let callers distinguish between
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* the Formattable(UDate) constructor and the Formattable(double)
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* constructor; the compiler cannot distinguish the signatures,
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* since UDate is currently typedefed to be either double or long.
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* If UDate is changed later to be a bonafide class
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* or struct, then we no longer need this enum.
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* @draft ICU 2.4
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*/
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enum ISDATE { kIsDate };
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/**
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* Default constructor
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* @draft ICU 2.4
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*/
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Formattable(); // Type kLong, value 0
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/**
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* Creates a Formattable object with a UDate instance.
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* @param d the UDate instance.
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* @param flag the flag to indicate this is a date. Always set it to kIsDate
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* @stable ICU 2.0
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*/
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Formattable(UDate d, ISDATE flag);
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/**
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* Creates a Formattable object with a double number.
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* @param d the double number.
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* @stable ICU 2.0
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*/
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Formattable(double d);
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/**
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* Creates a Formattable object with a long number.
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* @param l the long number.
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* @stable ICU 2.0
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*/
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Formattable(int32_t l);
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/**
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* Creates a Formattable object with an int64_t number
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* @param ll the int64_t number.
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* @draft ICU 2.8
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*/
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Formattable(int64_t ll);
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/**
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* Creates a Formattable object with a char string pointer.
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* Assumes that the char string is null terminated.
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* @param strToCopy the char string.
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* @stable ICU 2.0
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*/
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Formattable(const char* strToCopy);
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/**
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* Creates a Formattable object with a UnicodeString object to copy from.
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* @param strToCopy the UnicodeString string.
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* @stable ICU 2.0
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*/
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Formattable(const UnicodeString& strToCopy);
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/**
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* Creates a Formattable object with a UnicodeString object to adopt from.
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* @param strToAdopt the UnicodeString string.
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* @stable ICU 2.0
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*/
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Formattable(UnicodeString* strToAdopt);
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/**
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* Creates a Formattable object with an array of Formattable objects.
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* @param arrayToCopy the Formattable object array.
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* @param count the array count.
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* @stable ICU 2.0
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*/
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Formattable(const Formattable* arrayToCopy, int32_t count);
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/**
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* Copy constructor.
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* @stable ICU 2.0
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*/
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Formattable(const Formattable&);
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/**
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* Assignment operator.
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* @param rhs The Formattable object to copy into this object.
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* @stable ICU 2.0
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*/
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Formattable& operator=(const Formattable &rhs);
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/**
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* Equality comparison.
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* @param other the object to be compared with.
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* @return TRUE if other are equal to this, FALSE otherwise.
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* @stable ICU 2.0
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*/
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UBool operator==(const Formattable &other) const;
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/**
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* Equality operator.
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* @param other the object to be compared with.
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* @return TRUE if other are unequal to this, FALSE otherwise.
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* @stable ICU 2.0
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*/
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UBool operator!=(const Formattable& other) const
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{ return !operator==(other); }
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/**
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* Destructor.
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* @stable ICU 2.0
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*/
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virtual ~Formattable();
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/**
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* The list of possible data types of this Formattable object.
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* @draft ICU 2.4
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*/
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enum Type {
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/** @draft ICU 2.4 */
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kDate, // Date
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/** @draft ICU 2.4 */
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kDouble, // double
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/** @draft ICU 2.4 */
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kLong, // long
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/** @draft ICU 2.4 */
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kString, // UnicodeString
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/** @draft ICU 2.4 */
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kArray, // Formattable[]
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/** @draft ICU 2.8 */
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kInt64 // int64
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};
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/**
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* Gets the data type of this Formattable object.
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* @return the data type of this Formattable object.
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* @stable ICU 2.0
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*/
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Type getType(void) const;
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/**
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* Gets the double value of this object.
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* @return the double value of this object.
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* @stable ICU 2.0
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*/
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double getDouble(void) const { return fValue.fDouble; }
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/**
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* Gets the double value of this object. This converts from long or
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* int64 values as required (conversion from int64 can lose precision).
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* If the type is not a numeric type, 0 is returned and the status
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* is set to U_INVALID_FORMAT_ERROR.
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* @param status the error code
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* @return the double value of this object.
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* @draft ICU 2.8
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*/
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double getDouble(UErrorCode* status) const;
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/**
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* Gets the long value of this object.
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* @return the long value of this object.
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* @stable ICU 2.0
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*/
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int32_t getLong(void) const { return (int32_t)fValue.fInt64; }
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/**
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* Gets the long value of this object. This converts from double or
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* int64 values as required. If the magnitude is too large to fit in a long,
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* the maximum or minimum long value, as appropriate, is returned and
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* the status is set to U_INVALID_FORMAT_ERROR.
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* If the type is not a numeric type, 0 is returned and the status
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* is set to U_INVALID_FORMAT_ERROR.
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* @param status the error code
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* @return the long value of this object.
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* @stable ICU 2.0
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*/
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int32_t getLong(UErrorCode* status) const;
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/**
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* Gets the int64 value of this object.
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* @return the int64 value of this object.
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* @draft ICU 2.8
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*/
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int64_t getInt64(void) const { return fValue.fInt64; }
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/**
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* Gets the int64 value of this object. This converts from double or
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* int64 values as required. If the value value won't fit in an int64,
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* the maximum or minimum in64 value, as appropriate, is returned and
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* the status is set to U_INVALID_FORMAT_ERROR.
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* If the type is not a numeric type, 0 is returned and the status
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* is set to U_INVALID_FORMAT_ERROR.
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* @param status the error code
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* @return the int64 value of this object.
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* @draft ICU 2.8
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*/
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int64_t getInt64(UErrorCode* status) const;
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/**
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* Gets the Date value of this object.
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* @return the Date value of this object.
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* @stable ICU 2.0
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*/
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UDate getDate() const { return fValue.fDate; }
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/**
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* Gets the Date value of this object.
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* @param status the error code. If the type is not a date, status
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* is set to U_INVALID_FORMAT_ERROR and the return value is undefined.
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* @return the Date value of this object.
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* @draft ICU 2.8
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*/
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UDate getDate(UErrorCode* status) const;
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/**
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* Gets the string value of this object.
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* @param result Output param to receive the Date value of this object.
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* @return A reference to 'result'.
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* @stable ICU 2.0
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*/
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UnicodeString& getString(UnicodeString& result) const
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{ result=*fValue.fString; return result; }
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/**
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* Gets the string value of this object.
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* @param result Output param to receive the Date value of this object.
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* @param status the error code. If the type is not a string, status
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* is set to U_INVALID_FORMAT_ERROR and the result is set to bogus.
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* @return A reference to 'result'.
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* @draft ICU 2.8
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*/
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UnicodeString& getString(UnicodeString& result, UErrorCode* status) const;
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/**
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* Gets a const reference to the string value of this object.
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* @return a const reference to the string value of this object.
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* @stable ICU 2.0
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*/
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inline const UnicodeString& getString(void) const;
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/**
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* Gets a const reference to the string value of this object.
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* @param status the error code. If the type is not a string, status
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* is set to U_INVALID_FORMAT_ERROR and the result is a bogus string.
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* @return a const reference to the string value of this object.
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* @draft ICU 2.8
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*/
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const UnicodeString& getString(UErrorCode* status) const;
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/**
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* Gets a reference to the string value of this object.
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* @return a reference to the string value of this object.
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* @stable ICU 2.0
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*/
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inline UnicodeString& getString(void);
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/**
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* Gets a reference to the string value of this object.
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* @param status the error code. If the type is not a string, status
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* is set to U_INVALID_FORMAT_ERROR and the result is a bogus string.
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* @return a reference to the string value of this object.
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* @draft ICU 2.8
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*/
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UnicodeString& getString(UErrorCode* status);
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/**
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* Gets the array value and count of this object.
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* @param count fill-in with the count of this object.
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* @return the array value of this object.
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* @stable ICU 2.0
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*/
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const Formattable* getArray(int32_t& count) const
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{ count=fValue.fArrayAndCount.fCount; return fValue.fArrayAndCount.fArray; }
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/**
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* Gets the array value and count of this object.
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* @param count fill-in with the count of this object.
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* @param status the error code. If the type is not an array, status
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* is set to U_INVALID_FORMAT_ERROR, count is set to 0, and the result is NULL.
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* @return the array value of this object.
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* @draft ICU 2.8
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*/
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const Formattable* getArray(int32_t& count, UErrorCode* status) const;
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/**
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* Accesses the specified element in the array value of this Formattable object.
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* @param index the specified index.
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* @return the accessed element in the array.
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* @stable ICU 2.0
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*/
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Formattable& operator[](int32_t index) { return fValue.fArrayAndCount.fArray[index]; }
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/**
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* Sets the double value of this object.
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* @param d the new double value to be set.
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* @stable ICU 2.0
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*/
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void setDouble(double d);
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/**
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* Sets the long value of this object.
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* @param l the new long value to be set.
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* @stable ICU 2.0
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*/
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void setLong(int32_t l);
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/**
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* Sets the int64 value of this object.
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* @param ll the new int64 value to be set.
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* @draft ICU 2.8
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*/
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void setInt64(int64_t ll);
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/**
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* Sets the Date value of this object.
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* @param d the new Date value to be set.
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* @stable ICU 2.0
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*/
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void setDate(UDate d);
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/**
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* Sets the string value of this object.
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* @param stringToCopy the new string value to be set.
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* @stable ICU 2.0
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*/
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void setString(const UnicodeString& stringToCopy);
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/**
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* Sets the array value and count of this object.
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* @param array the array value.
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* @param count the number of array elements to be copied.
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* @stable ICU 2.0
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*/
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void setArray(const Formattable* array, int32_t count);
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/**
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* Sets and adopts the string value and count of this object.
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* @param stringToAdopt the new string value to be adopted.
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* @stable ICU 2.0
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*/
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void adoptString(UnicodeString* stringToAdopt);
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/**
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* Sets and adopts the array value and count of this object.
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* @stable ICU 2.0
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*/
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void adoptArray(Formattable* array, int32_t count);
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*
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* @draft ICU 2.2
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*/
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virtual UClassID getDynamicClassID() const;
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*
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* @draft ICU 2.2
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*/
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static UClassID getStaticClassID();
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private:
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/**
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* Cleans up the memory for unwanted values. For example, the adopted
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* string or array objects.
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*/
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void dispose(void);
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/**
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* Creates a new Formattable array and copies the values from the specified
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* original.
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* @param array the original array
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* @param count the original array count
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* @return the new Formattable array.
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*/
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static Formattable* createArrayCopy(const Formattable* array, int32_t count);
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static UnicodeString* gBogus;
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static UnicodeString* getBogus();
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// Note: For now, we do not handle unsigned long and unsigned
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// double types. Smaller unsigned types, such as unsigned
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// short, can fit within a long.
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union {
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UnicodeString* fString;
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double fDouble;
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int64_t fInt64;
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UDate fDate;
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struct
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{
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Formattable* fArray;
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int32_t fCount;
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} fArrayAndCount;
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} fValue;
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Type fType;
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};
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inline Formattable*
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Formattable::createArrayCopy(const Formattable* array, int32_t count)
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{
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Formattable *result = new Formattable[count];
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for (int32_t i=0; i<count; ++i) result[i] = array[i]; // Don't memcpy!
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return result;
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}
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inline UDate Formattable::getDate(UErrorCode* status) const {
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if (status && U_SUCCESS(*status) && fType != kDate) {
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*status = U_INVALID_FORMAT_ERROR;
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return 0;
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}
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return fValue.fDate;
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}
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inline const UnicodeString& Formattable::getString(void) const {
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return *fValue.fString;
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}
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inline UnicodeString& Formattable::getString(void) {
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return *fValue.fString;
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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#endif //_FMTABLE
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//eof
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