/*
**********************************************************************
* Copyright (C) 1997-2006, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*
* File resbund.cpp
*
* Modification History:
*
* Date Name Description
* 02/05/97 aliu Fixed bug in chopLocale. Added scanForLocaleInFile
* based on code taken from scanForLocale. Added
* constructor which attempts to read resource bundle
* from a specific file, without searching other files.
* 02/11/97 aliu Added UErrorCode return values to constructors. Fixed
* infinite loops in scanForFile and scanForLocale.
* Modified getRawResourceData to not delete storage in
* localeData and resourceData which it doesn't own.
* Added Mac compatibility #ifdefs for tellp() and
* ios::nocreate.
* 03/04/97 aliu Modified to use ExpandingDataSink objects instead of
* the highly inefficient ostrstream objects.
* 03/13/97 aliu Rewrote to load in entire resource bundle and store
* it as a Hashtable of ResourceBundleData objects.
* Added state table to govern parsing of files.
* Modified to load locale index out of new file distinct
* from default.txt.
* 03/25/97 aliu Modified to support 2-d arrays, needed for timezone data.
* Added support for custom file suffixes. Again, needed
* to support timezone data. Improved error handling to
* detect duplicate tags and subtags.
* 04/07/97 aliu Fixed bug in getHashtableForLocale(). Fixed handling
* of failing UErrorCode values on entry to API methods.
* Fixed bugs in getArrayItem() for negative indices.
* 04/29/97 aliu Update to use new Hashtable deletion protocol.
* 05/06/97 aliu Flattened kTransitionTable for HP compiler.
* Fixed usage of CharString.
* 06/11/99 stephen Removed parsing of .txt files.
* Reworked to use new binary format.
* Cleaned up.
* 06/14/99 stephen Removed methods taking a filename suffix.
* 06/22/99 stephen Added missing T_FileStream_close in parse()
* 11/09/99 weiv Added getLocale(), rewritten constructForLocale()
* March 2000 weiv complete overhaul.
******************************************************************************
*/
#include "unicode/utypes.h"
#include "unicode/resbund.h"
#include "umutex.h"
#include "uresimp.h"
U_NAMESPACE_BEGIN
/*-----------------------------------------------------------------------------
* Implementation Notes
*
* Resource bundles are read in once, and thereafter cached.
* ResourceBundle statically keeps track of which files have been
* read, so we are guaranteed that each file is read at most once.
* Resource bundles can be loaded from different data directories and
* will be treated as distinct, even if they are for the same locale.
*
* Resource bundles are lightweight objects, which have pointers to
* one or more shared Hashtable objects containing all the data.
* Copying would be cheap, but there is no copy constructor, since
* there wasn't one in the original API.
*
* The ResourceBundle parsing mechanism is implemented as a transition
* network, for easy maintenance and modification. The network is
* implemented as a matrix (instead of in code) to make this even
* easier. The matrix contains Transition objects. Each Transition
* object describes a destination node and an action to take before
* moving to the destination node. The source node is encoded by the
* index of the object in the array that contains it. The pieces
* needed to understand the transition network are the enums for node
* IDs and actions, the parse() method, which walks through the
* network and implements the actions, and the network itself. The
* network guarantees certain conditions, for example, that a new
* resource will not be closed until one has been opened first; or
* that data will not be stored into a TaggedList until a TaggedList
* has been created. Nonetheless, the code in parse() does some
* consistency checks as it runs the network, and fails with an
* U_INTERNAL_PROGRAM_ERROR if one of these checks fails. If the input
* data has a bad format, an U_INVALID_FORMAT_ERROR is returned. If you
* see an U_INTERNAL_PROGRAM_ERROR the transition matrix has a bug in
* it.
*
* Old functionality of multiple locales in a single file is still
* supported. For this reason, LOCALE names override FILE names. If
* data for en_US is located in the en.txt file, once it is loaded,
* the code will not care where it came from (other than remembering
* which directory it came from). However, if there is an en_US
* resource in en_US.txt, that will take precedence. There is no
* limit to the number or type of resources that can be stored in a
* file, however, files are only searched in a specific way. If
* en_US_CA is requested, then first en_US_CA.txt is searched, then
* en_US.txt, then en.txt, then default.txt. So it only makes sense
* to put certain locales in certain files. In this example, it would
* be logical to put en_US_CA, en_US, and en into the en.txt file,
* since they would be found there if asked for. The extreme example
* is to place all locale resources into default.txt, which should
* also work.
*
* Inheritance is implemented. For example, xx_YY_zz inherits as
* follows: xx_YY_zz, xx_YY, xx, default. Inheritance is implemented
* as an array of hashtables. There will be from 1 to 4 hashtables in
* the array.
*
* Fallback files are implemented. The fallback pattern is Language
* Country Variant (LCV) -> LC -> L. Fallback is first done for the
* requested locale. Then it is done for the default locale, as
* returned by Locale::getDefault(). Then the special file
* default.txt is searched for the default locale. The overall FILE
* fallback path is LCV -> LC -> L -> dLCV -> dLC -> dL -> default.
*
* Note that although file name searching includes the default locale,
* once a ResourceBundle object is constructed, the inheritance path
* no longer includes the default locale. The path is LCV -> LC -> L
* -> default.
*
* File parsing is lazy. Nothing is parsed unless it is called for by
* someone. So when a ResourceBundle for xx_YY_zz is constructed,
* only that locale is parsed (along with anything else in the same
* file). Later, if the FooBar tag is asked for, and if it isn't
* found in xx_YY_zz, then xx_YY.txt will be parsed and checked, and
* so forth, until the chain is exhausted or the tag is found.
*
* Thread-safety is implemented around caches, both the cache that
* stores all the resouce data, and the cache that stores flags
* indicating whether or not a file has been visited. These caches
* delete their storage at static cleanup time, when the process
* quits.
*
* ResourceBundle supports TableCollation as a special case. This
* involves having special ResourceBundle objects which DO own their
* data, since we don't want large collation rule strings in the
* ResourceBundle cache (these are already cached in the
* TableCollation cache). TableCollation files (.ctx files) have the
* same format as normal resource data files, with a different
* interpretation, from the standpoint of ResourceBundle. .ctx files
* are loaded into otherwise ordinary ResourceBundle objects. They
* don't inherit (that's implemented by TableCollation) and they own
* their data (as mentioned above). However, they still support
* possible multiple locales in a single .ctx file. (This is in
* practice a bad idea, since you only want the one locale you're
* looking for, and only one tag will be present
* ("CollationElements"), so you don't need an inheritance chain of
* multiple locales.) Up to 4 locale resources will be loaded from a
* .ctx file; everything after the first 4 is ignored (parsed and
* deleted). (Normal .txt files have no limit.) Instead of being
* loaded into the cache, and then looked up as needed, the locale
* resources are read straight into the ResourceBundle object.
*
* The Index, which used to reside in default.txt, has been moved to a
* new file, index.txt. This file contains a slightly modified format
* with the addition of the "InstalledLocales" tag; it looks like:
*
* Index {
* InstalledLocales {
* ar
* ..
* zh_TW
* }
* }
*/
//-----------------------------------------------------------------------------
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ResourceBundle)
ResourceBundle::ResourceBundle(UErrorCode &err)
:UObject(), fLocale(NULL)
{
fResource = ures_open(0, Locale::getDefault().getName(), &err);
}
ResourceBundle::ResourceBundle(const ResourceBundle &other)
:UObject(other), fLocale(NULL)
{
UErrorCode status = U_ZERO_ERROR;
if (other.fResource) {
fResource = ures_copyResb(0, other.fResource, &status);
} else {
/* Copying a bad resource bundle */
fResource = NULL;
}
}
ResourceBundle::ResourceBundle(UResourceBundle *res, UErrorCode& err)
:UObject(), fLocale(NULL)
{
if (res) {
fResource = ures_copyResb(0, res, &err);
} else {
/* Copying a bad resource bundle */
fResource = NULL;
}
}
ResourceBundle::ResourceBundle(const char* path, const Locale& locale, UErrorCode& err)
:UObject(), fLocale(NULL)
{
fResource = ures_open(path, locale.getName(), &err);
}
ResourceBundle& ResourceBundle::operator=(const ResourceBundle& other)
{
if(this == &other) {
return *this;
}
if(fResource != 0) {
ures_close(fResource);
fResource = NULL;
}
UErrorCode status = U_ZERO_ERROR;
if (other.fResource) {
fResource = ures_copyResb(0, other.fResource, &status);
} else {
/* Copying a bad resource bundle */
fResource = NULL;
}
return *this;
}
ResourceBundle::~ResourceBundle()
{
if(fResource != 0) {
ures_close(fResource);
}
if(fLocale != NULL) {
delete(fLocale);
}
}
ResourceBundle *
ResourceBundle::clone() const {
return new ResourceBundle(*this);
}
UnicodeString ResourceBundle::getString(UErrorCode& status) const {
int32_t len = 0;
const UChar *r = ures_getString(fResource, &len, &status);
return UnicodeString(TRUE, r, len);
}
const uint8_t *ResourceBundle::getBinary(int32_t& len, UErrorCode& status) const {
return ures_getBinary(fResource, &len, &status);
}
const int32_t *ResourceBundle::getIntVector(int32_t& len, UErrorCode& status) const {
return ures_getIntVector(fResource, &len, &status);
}
uint32_t ResourceBundle::getUInt(UErrorCode& status) const {
return ures_getUInt(fResource, &status);
}
int32_t ResourceBundle::getInt(UErrorCode& status) const {
return ures_getInt(fResource, &status);
}
const char *ResourceBundle::getName(void) const {
return ures_getName(fResource);
}
const char *ResourceBundle::getKey(void) const {
return ures_getKey(fResource);
}
UResType ResourceBundle::getType(void) const {
return ures_getType(fResource);
}
int32_t ResourceBundle::getSize(void) const {
return ures_getSize(fResource);
}
UBool ResourceBundle::hasNext(void) const {
return ures_hasNext(fResource);
}
void ResourceBundle::resetIterator(void) {
ures_resetIterator(fResource);
}
ResourceBundle ResourceBundle::getNext(UErrorCode& status) {
UResourceBundle r;
ures_initStackObject(&r);
ures_getNextResource(fResource, &r, &status);
ResourceBundle res(&r, status);
if (U_SUCCESS(status)) {
ures_close(&r);
}
return res;
}
UnicodeString ResourceBundle::getNextString(UErrorCode& status) {
int32_t len = 0;
const UChar* r = ures_getNextString(fResource, &len, 0, &status);
return UnicodeString(TRUE, r, len);
}
UnicodeString ResourceBundle::getNextString(const char ** key, UErrorCode& status) {
int32_t len = 0;
const UChar* r = ures_getNextString(fResource, &len, key, &status);
return UnicodeString(TRUE, r, len);
}
ResourceBundle ResourceBundle::get(int32_t indexR, UErrorCode& status) const {
UResourceBundle r;
ures_initStackObject(&r);
ures_getByIndex(fResource, indexR, &r, &status);
ResourceBundle res(&r, status);
if (U_SUCCESS(status)) {
ures_close(&r);
}
return res;
}
UnicodeString ResourceBundle::getStringEx(int32_t indexS, UErrorCode& status) const {
int32_t len = 0;
const UChar* r = ures_getStringByIndex(fResource, indexS, &len, &status);
return UnicodeString(TRUE, r, len);
}
ResourceBundle ResourceBundle::get(const char* key, UErrorCode& status) const {
UResourceBundle r;
ures_initStackObject(&r);
ures_getByKey(fResource, key, &r, &status);
ResourceBundle res(&r, status);
if (U_SUCCESS(status)) {
ures_close(&r);
}
return res;
}
ResourceBundle ResourceBundle::getWithFallback(const char* key, UErrorCode& status){
UResourceBundle r;
ures_initStackObject(&r);
ures_getByKeyWithFallback(fResource, key, &r, &status);
ResourceBundle res(&r, status);
if(U_SUCCESS(status)){
ures_close(&r);
}
return res;
}
UnicodeString ResourceBundle::getStringEx(const char* key, UErrorCode& status) const {
int32_t len = 0;
const UChar* r = ures_getStringByKey(fResource, key, &len, &status);
return UnicodeString(TRUE, r, len);
}
const char*
ResourceBundle::getVersionNumber() const
{
return ures_getVersionNumber(fResource);
}
void ResourceBundle::getVersion(UVersionInfo versionInfo) const {
ures_getVersion(fResource, versionInfo);
}
const Locale &ResourceBundle::getLocale(void) const
{
UBool needInit;
UMTX_CHECK(NULL, (fLocale == NULL), needInit);
if(needInit) {
UErrorCode status = U_ZERO_ERROR;
const char *localeName = ures_getLocale(fResource, &status);
Locale *tLocale = new Locale(localeName);
umtx_lock(NULL);
ResourceBundle *me = (ResourceBundle *)this; // semantically const
if (me->fLocale == NULL) {
me->fLocale = tLocale;
tLocale = NULL;
}
umtx_unlock(NULL);
delete tLocale;
}
return *fLocale;
}
const Locale ResourceBundle::getLocale(ULocDataLocaleType type, UErrorCode &status) const
{
return ures_getLocaleByType(fResource, type, &status);
}
//eof
U_NAMESPACE_END