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/* -*-objc-*-
*
* GNUstep RSS Kit
* Copyright (C) 2006 Guenther Noack
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, in version 2.1
* of the License
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#import "RSSFactory.h"
#import "RSSArticle+Storage.h"
#import "GNUstep.h"
static id<RSSFactory> sharedFactory = nil;
static NSString* RSSArticleStorageDirectory = nil;
/**
* Converts a string to a string that's usable as a file system name. This is done
* by removing several forbidden characters, only leaving the allowed ones. (A helper method)
*/
NSString* stringToFSString( NSString* aString )
{
NSScanner* scanner = [NSScanner scannerWithString: aString];
NSMutableString* string = AUTORELEASE([[NSMutableString alloc] init]);
NSCharacterSet* allowedSet = [NSCharacterSet alphanumericCharacterSet];
do {
NSString* nextPart;
BOOL success;
// discard any unknown characters
if ([scanner scanUpToCharactersFromSet: allowedSet intoString: NULL] == YES) {
[string appendString: @"_"];
}
// scan known characters...
success = [scanner scanCharactersFromSet: allowedSet intoString: &nextPart];
// ...and add them to the string
if (success == YES) {
[string appendString: nextPart];
}
} while ([scanner isAtEnd] == NO);
return [NSString stringWithString: string];
}
@implementation RSSFactory
/**
* Returns the shared factory instance.
*/
+ (id<RSSFactory>) sharedFactory
{
if (sharedFactory == nil) {
ASSIGN(sharedFactory, AUTORELEASE([[RSSFactory alloc] init]));
}
return sharedFactory;
}
/**
* Sets another shared factory instance than the currently selected one.
*/
+ (void) setFactory: (id<RSSFactory>) aFactory
{
ASSIGN(sharedFactory, aFactory);
}
/**
* The default implementation of this method returns a new feed of
* the RSSFeed class.
*/
- (id<RSSFeed>) feedWithURL: (NSURL*) aURL
{
return [RSSFeed feedWithURL: aURL];
}
/**
* The default implementation of this method returns a new article
* of the RSSArticle class.
*/
- (id<RSSArticle>) articleWithHeadline: (NSString*) aHeadline
URL: (NSString*) aURL
content: (NSString*) aContent
date: (NSDate*) aDate
{
id <RSSArticle> article = [[RSSArticle alloc] initWithHeadline: aHeadline
url: aURL
description: aContent
date: aDate];
return AUTORELEASE(article);
}
/**
* The default implementation of this method returns a new article
* of the RSSArticle class.
*/
- (id<RSSArticle>) articleFromStorageWithURL: (NSString*) aURL
{
return [self articleFromDictionary:
[NSDictionary dictionaryWithContentsOfFile:
[self storagePathForURL: aURL]]];
}
/**
* The default implementation of this method returns a article
* of the RSSArticle class.
*/
- (id<RSSArticle>) articleFromDictionary: (NSDictionary*) aDictionary
{
return AUTORELEASE([[RSSArticle alloc] initWithDictionary: aDictionary]);
}
/**
* Returns the file path where an article with the anURL URL would be stored to.
*/
-(NSString*) storagePathForURL: (NSString*) anURL
{
if (RSSArticleStorageDirectory == nil) {
NSFileManager* manager;
BOOL isDir, exists;
NSString *storagePath;
storagePath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];
storagePath = [storagePath stringByAppendingPathComponent:[[NSProcessInfo processInfo] processName]];
storagePath = [storagePath stringByAppendingPathComponent:@"RSSArticles"];
ASSIGN(RSSArticleStorageDirectory, storagePath);
manager = [NSFileManager defaultManager];
exists = [manager fileExistsAtPath: RSSArticleStorageDirectory isDirectory: &isDir];
if (exists) {
if (isDir == NO) {
[[NSException exceptionWithName: @"RSSArticleStorageDirectoryIsNotADirectory"
reason: @"The storage directory for RSS articles is not a directory."
userInfo: nil] raise];
}
} else {
if ([manager createDirectoryAtPath: RSSArticleStorageDirectory
attributes: nil] == NO) {
[[NSException exceptionWithName: @"RSSArticleStorageDirectoryCreationFailed"
reason: @"Creation of the storage directory for RSS Articles failed."
userInfo: nil] raise];
}
}
}
return [NSString stringWithFormat: @"%@/%@.rssarticle", RSSArticleStorageDirectory, stringToFSString(anURL)];
}
@end
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