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Provide a concrete baltzo::Loader for Zoneinfo binary files.
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| namespace | baltzo |
baltzo::Loader for Zoneinfo binary files. | baltzo::DataFileLoader | concrete baltzo::Loader for Zoneinfo binary data |
baltzo::DataFileLoader, that is a concrete implementation of the baltzo::Loader protocol for loading, into a baltzo::Zoneinfo object, the properties of a time zone described in a Zoneinfo binary database file. The following inheritance hierarchy diagram shows the classes involved and their methods: ,----------------------. ( baltzo::DataFileLoader ) `----------------------' | ctor | configureRootPath | configureRootPathIfPlausible | loadTimeZoneFilePath | rootPath | isRootPathPlausible V ,--------------. ( baltzo::Loader ) `--------------' dtor loadTimeZone
baltzo::DataFileLoader is supplied a file-system location using the configureRootPath method. This location should correspond to the root directory of a hierarchy containing Zoneinfo binary data files, where each Zoneinfo time-zone identifier indicates a relative path from the root directory to the binary data file containing the information for that time zone. Accordingly, baltzo::DataFileLoader provides a method that, given a time-zone identifier, will open the corresponding data file (relative to the root directory tree supplied at construction), and load, into a baltzo::Zoneinfo object, the data from that file. http://www.twinsun.com/tz/tz-link.htm, including the time-zone rules for the supported time zones, and source code for the zic compiler (for compiling those rules into the binary representation used by this component). See baltzo_zoneinfobinaryreader for more information about the binary file format. /) to the file containing data for the time zone. So, given a hypothetical root directory "/etc/time_zones", the time-zone data file for "America/New_York" will be located in "/etc/time_zones/America/New_York". baltzo::DataFileLoader is const thread-safe, meaning that accessors may be invoked concurrently from different threads, but it is not safe to access or modify a baltzo::DataFileLoader in one thread while another thread modifies the same object. baltzo::DataFileLoader to load the Zoneinfo time-zone data for a time zone. zic compiler -- a publicly available tool provided as part of the standard Zoneinfo distribution (see http://www.twinsun.com/tz/tz-link.htm) -- and deployed in a standard directory location (see baltzo_defaultzoneinfocache). const char ASIA_BANGKOK_DATA[] = { 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x08, 0xa2, 0x6a, 0x67, 0xc4, 0x01, 0x00, 0x00, 0x5e, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x62, 0x70, 0x00, 0x04, 0x42, 0x4d, 0x54, 0x00, 0x49, 0x43, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0c, 0xff, 0xff, 0xff, 0xff, 0x56, 0xb6, 0x85, 0xc4, 0xff, 0xff, 0xff, 0xff, 0xa2, 0x6a, 0x67, 0xc4, 0x01, 0x02, 0x00, 0x00, 0x5e, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x5e, 0x3c, 0x00, 0x04, 0x00, 0x00, 0x62, 0x70, 0x00, 0x08, 0x4c, 0x4d, 0x54, 0x00, 0x42, 0x4d, 0x54, 0x00, 0x49, 0x43, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x49, 0x43, 0x54, 0x2d, 0x37, 0x0a };
#ifdef BSLS_PLATFORM_OS_WINDOWS const char *TEST_DIRECTORY = "test\\Asia"; const char *TEST_FILE = "test\\Asia\\Bangkok"; #else const char *TEST_DIRECTORY = "test/Asia"; const char *TEST_FILE = "test/Asia/Bangkok"; #endif int rc = bdls::FileUtil::createDirectories(TEST_DIRECTORY, true); assert(0 == rc);
bsl::ofstream outputFile(TEST_FILE, bsl::ofstream::binary);
assert(outputFile.is_open());
outputFile.write(ASIA_BANGKOK_DATA, sizeof(ASIA_BANGKOK_DATA));
assert(outputFile);
outputFile.close();
Bangkok should now appear in the Asia sub-directory, under out test directory. baltzo::DataFileLoader to load a time-zone data file into a baltzo::Zoneinfo object. We start by creating a baltzo::DataFileLoader object, loader, and configure it with the relative path "test" which we created in Example 1 (Prologue). baltzo::DataFileLoader loader; loader.configureRootPath("test");
loadTimeZoneFilePath method to verify that loader will correctly locate the test data file we've created: const char *BANGKOK_ID = "Asia/Bangkok"; bsl::string bangkokDataPath; rc = loader.loadTimeZoneFilePath(&bangkokDataPath, BANGKOK_ID); assert(0 == rc); assert(TEST_FILE == bangkokDataPath); // Note 'TEST_FILE' from Example 1.
baltzo::Zoneinfo object, timeZone, and load it using loader: baltzo::Zoneinfo timeZone; rc = loader.loadTimeZone(&timeZone, BANGKOK_ID); assert(0 == rc);
timezone object are in agreement with the properties defined in the binary data (see baltzo_zoneinfobinaryreader): (1) That the object's identifier is "Asia/Bangkok", and (2) the object contains three local time descriptors, "LMT" (Local Mean Time), "BMT" (Bangkok Mean Time) and "ICT" (Indochina Time), in that order: assert(BANGKOK_ID == timeZone.identifier()); baltzo::Zoneinfo::LocalTimeDescriptorConstIterator iterator = timeZone.descriptorBegin(); assert("LMT" == iterator->description()); ++iterator; assert("BMT" == iterator->description()); ++iterator; assert("ICT" == iterator->description());
timeZone object can now be use for time-zone calculations. See baltzo_zoneinfoutil. int rc = bdls::FileUtil::remove(TEST_DIRECTORY, true); assert(0 == rc);
1.7.1