118 lines
3.4 KiB
C++
118 lines
3.4 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2008-2010, Google, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*/
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#include <typeinfo> // for 'typeid' to work
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#include "unicode/tmunit.h"
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#if !UCONFIG_NO_FORMATTING
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TimeUnit)
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/*
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* There are only 7 time units.
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* So, TimeUnit could be made as singleton
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* (similar to uniset_props.cpp, or unorm.cpp,
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* in which a static TimeUnit* array is created, and
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* the creatInstance() returns a const TimeUnit*).
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* But the constraint is TimeUnit is a data member of Measure.
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* But Measure (which is an existing API) does not expect it's "unit" member
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* as singleton. Meaure takes ownership of the "unit" member.
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* In its constructor, it does not take a const "unit" pointer.
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* Also, Measure can clone and destruct the "unit" pointer.
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* In order to preserve the old behavior and let Measure handle singleton "unit",
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* 1. a flag need to be added in Measure;
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* 2. a new constructor which takes const "unit" as parameter need to be added,
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* and this new constructor will set the flag on.
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* 3. clone and destructor need to check upon this flag to distinguish on how
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* to handle the "unit".
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*
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* Since TimeUnit is such a light weight object, comparing with the heavy weight
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* format operation, we decided to avoid the above complication.
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*
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* So, both TimeUnit and CurrencyUnit (the 2 subclasses of MeasureUnit) are
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* immutable and non-singleton.
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*
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* Currently, TimeUnitAmount and CurrencyAmount are immutable.
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* If an application needs to create a long list of TimeUnitAmount on the same
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* time unit but different number, for example,
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* 1 hour, 2 hour, 3 hour, ................. 10,000 hour,
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* there might be performance hit because 10,000 TimeUnit object,
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* although all are the same time unit, will be created in heap and deleted.
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*
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* To address this performance issue, if there is any in the future,
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* we should and need to change TimeUnitAmount and CurrencyAmount to be
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* immutable by allowing a setter on the number.
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* Or we need to add 2 parallel mutable classes in order to
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* preserve the existing API.
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* Or we can use freezable.
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*/
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TimeUnit* U_EXPORT2
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TimeUnit::createInstance(TimeUnit::UTimeUnitFields timeUnitField,
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UErrorCode& status) {
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if (U_FAILURE(status)) {
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return NULL;
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}
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if (timeUnitField < 0 || timeUnitField >= UTIMEUNIT_FIELD_COUNT) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return NULL;
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}
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return new TimeUnit(timeUnitField);
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}
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TimeUnit::TimeUnit(TimeUnit::UTimeUnitFields timeUnitField) {
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fTimeUnitField = timeUnitField;
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}
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TimeUnit::TimeUnit(const TimeUnit& other)
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: MeasureUnit(other) {
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*this = other;
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}
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UObject*
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TimeUnit::clone() const {
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return new TimeUnit(*this);
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}
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TimeUnit&
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TimeUnit::operator=(const TimeUnit& other) {
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if (this == &other) {
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return *this;
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}
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fTimeUnitField = other.fTimeUnitField;
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return *this;
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}
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UBool
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TimeUnit::operator==(const UObject& other) const {
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return (typeid(*this) == typeid(other)
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&& fTimeUnitField == ((TimeUnit*)&other)->fTimeUnitField);
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}
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TimeUnit::UTimeUnitFields
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TimeUnit::getTimeUnitField() const {
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return fTimeUnitField;
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}
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TimeUnit::~TimeUnit() {
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}
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U_NAMESPACE_END
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#endif
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