277 lines
8.0 KiB
C++
277 lines
8.0 KiB
C++
/*
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********************************************************************************
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* Copyright (C) 1997-1999, 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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#include "unicode/utypes.h"
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#include "unicode/unistr.h"
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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 {
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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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*/
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enum ISDATE { kIsDate };
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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 ISDATE the flag to indicate this is a date.
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* @stable
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*/
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Formattable(UDate d, ISDATE);
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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
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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 d the long number.
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* @stable
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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 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
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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
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*/
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Formattable(const UnicodeString& stringToCopy);
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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
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*/
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Formattable(UnicodeString* stringToAdopt);
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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
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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
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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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* @stable
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*/
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Formattable& operator=(const Formattable&);
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/**
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* Equality comparison.
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* @stable
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*/
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UBool operator==(const Formattable&) const;
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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
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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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*/
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enum Type {
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kDate, // Date
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kDouble, // double
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kLong, // long
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kString, // UnicodeString
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kArray // Formattable[]
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};
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/**
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* Gets the data type of this Formattable object.
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* @stable
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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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* @stable
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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 long value of this object.
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* @stable
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*/
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int32_t getLong(void) const { return fValue.fLong; }
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/**
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* Gets the Date value of this object.
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* @stable
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*/
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UDate getDate(void) const { return fValue.fDate; }
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/**
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* Gets the string value of this object.
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* @stable
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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 a const reference to the string value of this object.
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* @draft
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*/
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inline const UnicodeString& getString(void) const;
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/**
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* Gets a reference to the string value of this object.
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* @draft
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*/
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inline UnicodeString& getString(void);
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/**
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* Gets the array value and count of this object.
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* @stable
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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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* 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
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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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* @stable
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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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* @stable
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*/
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void setLong(int32_t l);
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/**
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* Sets the Date value of this object.
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* @stable
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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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* @stable
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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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* @stable
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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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* @stable
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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
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*/
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void adoptArray(Formattable* array, int32_t count);
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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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// 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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int32_t fLong;
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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 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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#endif //_FMTABLE
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//eof
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