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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
- *******************************************************************************
- * Copyright (C) 2008-2014, Google, International Business Machines Corporation and
- * others. All Rights Reserved.
- *******************************************************************************
- */
-
-#include "unicode/tmunit.h"
-#include "uassert.h"
-
-#if !UCONFIG_NO_FORMATTING
-
-U_NAMESPACE_BEGIN
-
-UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TimeUnit)
-
-
-/*
- * There are only 7 time units.
- * So, TimeUnit could be made as singleton
- * (similar to uniset_props.cpp, or unorm.cpp,
- * in which a static TimeUnit* array is created, and
- * the creatInstance() returns a const TimeUnit*).
- * But the constraint is TimeUnit is a data member of Measure.
- * But Measure (which is an existing API) does not expect it's "unit" member
- * as singleton. Meaure takes ownership of the "unit" member.
- * In its constructor, it does not take a const "unit" pointer.
- * Also, Measure can clone and destruct the "unit" pointer.
- * In order to preserve the old behavior and let Measure handle singleton "unit",
- * 1. a flag need to be added in Measure;
- * 2. a new constructor which takes const "unit" as parameter need to be added,
- * and this new constructor will set the flag on.
- * 3. clone and destructor need to check upon this flag to distinguish on how
- * to handle the "unit".
- *
- * Since TimeUnit is such a light weight object, comparing with the heavy weight
- * format operation, we decided to avoid the above complication.
- *
- * So, both TimeUnit and CurrencyUnit (the 2 subclasses of MeasureUnit) are
- * immutable and non-singleton.
- *
- * Currently, TimeUnitAmount and CurrencyAmount are immutable.
- * If an application needs to create a long list of TimeUnitAmount on the same
- * time unit but different number, for example,
- * 1 hour, 2 hour, 3 hour, ................. 10,000 hour,
- * there might be performance hit because 10,000 TimeUnit object,
- * although all are the same time unit, will be created in heap and deleted.
- *
- * To address this performance issue, if there is any in the future,
- * we should and need to change TimeUnitAmount and CurrencyAmount to be
- * immutable by allowing a setter on the number.
- * Or we need to add 2 parallel mutable classes in order to
- * preserve the existing API.
- * Or we can use freezable.
- */
-TimeUnit* U_EXPORT2
-TimeUnit::createInstance(TimeUnit::UTimeUnitFields timeUnitField,
- UErrorCode& status) {
- if (U_FAILURE(status)) {
- return NULL;
- }
- if (timeUnitField < 0 || timeUnitField >= UTIMEUNIT_FIELD_COUNT) {
- status = U_ILLEGAL_ARGUMENT_ERROR;
- return NULL;
- }
- return new TimeUnit(timeUnitField);
-}
-
-
-TimeUnit::TimeUnit(TimeUnit::UTimeUnitFields timeUnitField) {
- fTimeUnitField = timeUnitField;
- switch (fTimeUnitField) {
- case UTIMEUNIT_YEAR:
- initTime("year");
- break;
- case UTIMEUNIT_MONTH:
- initTime("month");
- break;
- case UTIMEUNIT_DAY:
- initTime("day");
- break;
- case UTIMEUNIT_WEEK:
- initTime("week");
- break;
- case UTIMEUNIT_HOUR:
- initTime("hour");
- break;
- case UTIMEUNIT_MINUTE:
- initTime("minute");
- break;
- case UTIMEUNIT_SECOND:
- initTime("second");
- break;
- default:
- U_ASSERT(false);
- break;
- }
-}
-
-TimeUnit::TimeUnit(const TimeUnit& other)
-: MeasureUnit(other), fTimeUnitField(other.fTimeUnitField) {
-}
-
-UObject*
-TimeUnit::clone() const {
- return new TimeUnit(*this);
-}
-
-TimeUnit&
-TimeUnit::operator=(const TimeUnit& other) {
- if (this == &other) {
- return *this;
- }
- MeasureUnit::operator=(other);
- fTimeUnitField = other.fTimeUnitField;
- return *this;
-}
-
-TimeUnit::UTimeUnitFields
-TimeUnit::getTimeUnitField() const {
- return fTimeUnitField;
-}
-
-TimeUnit::~TimeUnit() {
-}
-
-
-U_NAMESPACE_END
-
-#endif