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Initial revision
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@581 72102866-910b-0410-8b05-ffd578937521
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Andrew McCallum
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397
Source/NSTimeZone.m
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397
Source/NSTimeZone.m
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/* Implementation for NSTimeZone for GNUStep
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Written by: Peter Burka <pburka@upei.ca>
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Date: July 1995
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This file is part of the GNU Objective C Class Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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This is about complete, but mostly untested. Many of the methods
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rely on NSDictionary and NSUserDefaults, neither of which are
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complete yet. I am testing and fixing as the supporting classes
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materialize.
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Note: in this implementation, all objects returned are always
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instances of NSTimeZoneDetail.
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*/
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#include <Foundation/NSDate.h>
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#include <Foundation/NSDictionary.h>
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#include <Foundation/NSArray.h>
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#include <Foundation/NSString.h>
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#include <Foundation/NSCoder.h>
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//#include <Foundation/NSUserDefaults.h>
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@class NSUserDefaults;
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#define MINUTES 60
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#define HOURS (60 * MINUTES)
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@interface NSConcreteTimeZoneDetail: NSTimeZoneDetail
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{
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@private
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BOOL dst; // true if Daylight Savings Time is in effect in this zone
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NSString* abbreviation; // the abbreviation
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NSString* name; // the name
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int deltaGMT; // difference (in seconds) from Greenwich
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}
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// initializing
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- initWithName:(NSString*)aName
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abbreviation:(NSString*)anAbbreviation
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secondsFromGMT:(int)aDifference
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isDaylightSaving:(BOOL)aDst;
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// querying
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- (BOOL)isDaylightSavingTimeZone;
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- (NSString *)timeZoneAbbreviation;
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- (int)timeZoneSecondsFromGMT;
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- (NSString*)timeZoneName;
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// archiving
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- (NSString*)description;
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@end
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@interface NSConcreteTimeZoneDetail (NSCopying)
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- (id)copyWithZone:(NSZone *)zone;
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@end
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@interface NSConcreteTimeZoneDetail (Archiving)
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- (void)encodeWithCoder:(NSCoder *)aCoder;
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- (id)initWithCoder:(NSCoder *)aDecoder;
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@end
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@implementation NSConcreteTimeZoneDetail
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- initWithName:(NSString*)aName
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abbreviation:(NSString*)anAbbreviation
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secondsFromGMT:(int)aDifference
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isDaylightSaving:(BOOL)aDst
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{
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[super init];
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//xxx initWithString is not yet available
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//name = [[NSString alloc] initWithString:aName];
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//abbreviation = [[NSString alloc] initWithString:anAbbreviation];
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name = [NSString stringWithCString: [aName cString]];
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abbreviation = [NSString stringWithCString: [anAbbreviation cString]];
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deltaGMT = aDifference;
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dst = aDst;
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return self;
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}
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- (NSString*)timeZoneName
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{
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return name;
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}
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- (BOOL)isDaylightSavingTimeZone
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{
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return dst;
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}
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- (NSString *)timeZoneAbbreviation
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{
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return abbreviation;
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}
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- (int)timeZoneSecondsFromGMT
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{
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return deltaGMT;
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}
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- (NSString*)description
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{
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char astr[1024]; // xxx ugly! But it'll do until NSString is done
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BOOL hasAbbreviation = [[self timeZoneAbbreviation] length] > 0;
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sprintf (astr,"%s %s%s%s %+is %s",
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[[self timeZoneName] cString],
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(hasAbbreviation ? "(" : ""),
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[[self timeZoneAbbreviation] cString],
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(hasAbbreviation ? ")" : ""),
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[self timeZoneSecondsFromGMT],
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([self isDaylightSavingTimeZone] ? "(DST)" : ""));
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return [NSString stringWithCString:astr];
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}
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@end
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@implementation NSConcreteTimeZoneDetail (NSCopying)
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- (id)copyWithZone:(NSZone *)zone
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{
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return [[[self class] allocWithZone:zone]
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initWithName:name
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abbreviation:abbreviation
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secondsFromGMT:deltaGMT
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isDaylightSaving:dst];
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}
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@end
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@implementation NSConcreteTimeZoneDetail (NSCoding)
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- (void)encodeWithCoder:(NSCoder *)aCoder
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{
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[super encodeWithCoder:aCoder];
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[aCoder encodeValuesOfObjCTypes:"i@@i", &dst, &abbreviation, &name, &deltaGMT];
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}
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- (id)initWithCoder:(NSCoder *)aDecoder
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{
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self = [super initWithCoder:aDecoder];
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[aDecoder decodeValuesOfObjCTypes:"i@@i", &dst, &abbreviation, &name, &deltaGMT];
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return self;
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}
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@end
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@implementation NSTimeZoneDetail
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- (BOOL)isDaylightSavingTimeZone
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{
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[self notImplemented:_cmd];
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return NO;
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}
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- (NSString *)timeZoneAbbreviation
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{
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[self notImplemented:_cmd];
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return nil;
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}
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- (int)timeZoneSecondsFromGMT
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{
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[self notImplemented:_cmd];
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return 0;
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}
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- (BOOL)isEqual:anObject
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{
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if (anObject == self) return YES;
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if ([super isEqual:anObject]) // this checks to ensure that they're the same class, no?
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if ([[self timeZoneName] isEqual: [anObject timeZoneName]])
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if ([[self timeZoneAbbreviation] isEqual: [anObject timeZoneAbbreviation]])
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if ([self isDaylightSavingTimeZone] == [anObject isDaylightSavingTimeZone])
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if ([self timeZoneSecondsFromGMT] == [anObject timeZoneSecondsFromGMT])
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return YES;
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return NO;
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}
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- (unsigned int)hash
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{
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// This should be sufficient for hashing
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return ([[self timeZoneName] hash] + 1) *
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([self timeZoneSecondsFromGMT] / MINUTES);
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}
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@end
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@implementation NSTimeZone
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#define DEFAULTDBKEY "Time Zone"
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#define LOCALDBKEY "Local Time Zone"
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#define TIMEZONEFILE "NSTimeZones"
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NSDictionary* abbreviationDictionary;
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+ (void)initialize
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{
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// initialize super
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[super initialize];
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#if 0
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if ((abbreviationDictionary =
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// [NSDictionary dictionaryWithContentsOfFile:@TIMEZONEFILE] //NIY
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[[NSDictionary dictionary] initWithContentsOfFile:@TIMEZONEFILE])
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== nil)
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#else
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if (1)
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#endif
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{
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NSConcreteTimeZoneDetail *tzones[] = {
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[[NSConcreteTimeZoneDetail alloc]
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initWithName: @"Greenwich Mean Time"
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abbreviation: @"GMT"
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secondsFromGMT: 0 * HOURS
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isDaylightSaving: NO],
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[[NSConcreteTimeZoneDetail alloc]
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initWithName: @"Atlantic STandard Time"
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abbreviation: @"AST"
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secondsFromGMT: -4 * HOURS
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isDaylightSaving: NO],
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[[NSConcreteTimeZoneDetail alloc]
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initWithName: @"Atlantic Daylight Time"
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abbreviation: @"ADT"
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secondsFromGMT: -3 * HOURS
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isDaylightSaving: YES],
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[[NSConcreteTimeZoneDetail alloc]
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initWithName: @"Eastern Standard Time"
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abbreviation: @"EST"
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secondsFromGMT: -5 * HOURS
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isDaylightSaving: NO],
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[[NSConcreteTimeZoneDetail alloc]
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initWithName: @"Eastern Daylight Time"
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abbreviation: @"EDT"
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secondsFromGMT: -4 * HOURS
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isDaylightSaving: YES]
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};
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NSString* abbrevs[] = {@"GMT", @"AST", @"ADT", @"EST", @"EDT"};
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fprintf (stderr, "Unable to load TimeZones from data file: '%s'\n",
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TIMEZONEFILE);
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abbreviationDictionary = [NSDictionary dictionaryWithObjects:tzones
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forKeys: abbrevs count:5];
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}
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return;
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}
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+ (id) allocWithZone: (NSZone*)z
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{
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if (self != [NSTimeZone class])
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return [super allocWithZone:z];
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return [NSConcreteTimeZoneDetail allocWithZone:z];
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}
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//Creating and Initializing an NSTimeZone
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+ (NSTimeZoneDetail *)defaultTimeZone
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{
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/* NSUserDefaults *db = [NSUserDefaults standardUserDefaults];
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return [self timeZoneWithName: [db stringForKey: @DEFAULTDBKEY]];
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*/
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return nil;
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}
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+ (NSTimeZone *)localTimeZone
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{
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/* NSUserDefaults *db = [NSUserDefaults standardUserDefaults];
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return [self timeZoneWithName: [db stringForKey: @LOCALDBKEY]];
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*/
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return nil;
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}
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+ (NSTimeZone *)timeZoneForSecondsFromGMT:(int)seconds
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{
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id step = [abbreviationDictionary objectEnumerator];
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NSConcreteTimeZoneDetail* zone;
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while ((zone = [step nextObject]) != nil)
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if (seconds == [zone timeZoneSecondsFromGMT]) break;
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[step autorelease];
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if (zone == nil)
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zone = [[NSConcreteTimeZoneDetail alloc]
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initWithName:
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[[NSString stringWithFormat:@"%+i", seconds] autorelease]
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abbreviation: @""
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secondsFromGMT: seconds
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isDaylightSaving: NO];
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return zone;
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}
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+ (NSTimeZoneDetail *)timeZoneWithAbbreviation:(NSString *)abbreviation
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{
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return [abbreviationDictionary objectForKey:abbreviation];
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}
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+ (NSTimeZone *)timeZoneWithName:(NSString *)aTimeZoneName
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{
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NSEnumerator* step = [abbreviationDictionary objectEnumerator];
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NSConcreteTimeZoneDetail* zone;
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while ((zone = [step nextObject]) != nil)
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if ([aTimeZoneName isEqual:[zone timeZoneName]]) break;
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[step release];
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return zone;
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}
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- (NSTimeZoneDetail *)timeZoneDetailForDate:(NSDate *)date
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// XXX not implemented yet!
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{
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return nil;
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}
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//Managing Time Zones
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+ (void)setDefaultTimeZone:(NSTimeZone *)aTimeZone
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{
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/* NSUserDefaults *db = [NSUserDefaults standardUserDefaults];
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if (aTimeZone != nil)
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[db setObject:[aTimeZone name] forKey: @DEFAULTDBKEY];
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else
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[db removeObjectForKey: @DEFAULTDBKEY];
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return;
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*/
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return;
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}
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// Getting Time Zone Information
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+ (NSDictionary *)abbreviationDictionary
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{
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return abbreviationDictionary;
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}
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- (NSString *)timeZoneName
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/* this is really the subclass's responsibility */
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{
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return @"";
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}
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//Getting Arrays of Time Zones
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+ (NSArray *)timeZoneArray
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/* this should return a NSArray of NSTimeZones.
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Instead, it returns a NSArray of NSTimeZoneDetail:NSTimeZone.
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This shouldn't cause problems, as far as I can tell.
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*/
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{
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return [abbreviationDictionary allValues];
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}
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- (NSArray *)timeZoneDetailArray
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{
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return [abbreviationDictionary allValues];
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}
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@end
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@implementation NSTimeZone (NSCopying)
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- (id)copyWithZone:(NSZone *)zone
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{
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return [super copyWithZone:zone];
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}
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@end
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@implementation NSTimeZone (Archiving)
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- (void)encodeWithCoder:(NSCoder *)aCoder
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{
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return [super encodeWithCoder:aCoder];
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}
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- (id)initWithCoder:(NSCoder *)aDecoder
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{
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return [super initWithCoder:aDecoder];
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}
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@end
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