Cocoa ( Objective-C )での 4store の Client Library (?)

動機
4storeを入れてみた．rubyのclient用ライブラリをみて，似たものをcocoaでやってみようと思った(たぶん既にどこかにあるだろうけど)．

入れる際(環境: MacOSX10.7)にハマった点

MacPortsでraptorとrasqalを入れたのだがraptorに1.x(www/raptor)と2.x(www/raptor2)があり, rasqal0.9.26がraptor2.xを利用して入っているのにraptor 1.xが入ったままだと4storeのmake時にエラーがでたこと．

"git clone https://github.com/garlik/4store.git"でとってきたらconfigureがなかったので(そういうものなのかな?), "sh autogen.sh"から始めたこと．

やってみた(rubyにあるload作ってないしsetもマネの途中)

FourStore.h

@interface FourStore : NSObject
{
    NSURL *_urlSPARQL;
    NSURL *_urlDATA;
    NSMutableArray *_prefixs;
}
- (id)initWithEndpoint:(NSString *)endpoint;
- (void)addPrefix:(NSString *)prefix uri:(NSString *)uri;
- (NSString *)addTurtle:(NSString *)turtle graph:(NSString *)graph;
//- (NSString *)setTurtle:(NSString *)turtle graph:(NSString *)graph;
- (NSString *)queryWithString:(NSString *)query;
- (NSString *)deleteWithGraph:(NSString *)graph;
@end

FourStore.m

#import "FourStore.h"

@implementation FourStore

- (id)init
{
    self = [super init];
    if (self) {
    }
    return self;
}
- (id)initWithEndpoint:(NSString *)endpoint
{
    if (![endpoint hasSuffix:@"/sparql/"]) {
        return nil;
    }
    self = [self init];
    if (self) {
        _urlSPARQL= [[NSURL URLWithString:endpoint] retain];
        NSArray *ary= [endpoint componentsSeparatedByString:@"/sparql/"];
        _urlDATA= [[NSURL URLWithString:[NSString stringWithFormat:@"%@/data/", [ary objectAtIndex:0]]] retain];
        _prefixs= [[NSMutableArray array] retain];
    }
    return self;
}
- (void)dealloc
{
    [_urlSPARQL release];
    [_urlDATA release];
    [super dealloc];
}
+ (NSString *)sendRequest:(NSURLRequest *)request
{
    NSURLResponse *response=nil;
    NSError *error= nil;
    NSData *data= [NSURLConnection sendSynchronousRequest:request
                                        returningResponse:&response
                                                    error:&error];
    if (error) {
        NSLog(@"statusCode %ld", [response statusCode]);
        NSLog(@"error code %ld", [error code]);
    }
    
    NSString *message= [[NSString alloc] initWithData:data
                                             encoding:NSUTF8StringEncoding];
    return [message autorelease];
}
+ (NSString *)send:(NSString *)request url:(NSURL *)url method:(NSString *)method
{
    NSMutableURLRequest *requestWithBodyParams = [[NSMutableURLRequest alloc] initWithURL:url];
    NSData *requestData = [request dataUsingEncoding:NSASCIIStringEncoding 
                                allowLossyConversion:YES];
    [requestWithBodyParams setHTTPBody:requestData];
    [requestWithBodyParams setValue:[NSString stringWithFormat:@"%d", [requestData length]]
                 forHTTPHeaderField:@"Content-Length"];   
    [requestWithBodyParams setValue:@"application/x-www-form-urlencoded"
                 forHTTPHeaderField:@"Content-Type"];  
    [requestWithBodyParams setHTTPMethod:method];
    
    NSString *msg=  [FourStore sendRequest:requestWithBodyParams];
    [requestWithBodyParams release];
    
    return msg;
}

- (void)addPrefix:(NSString *)prefix uri:(NSString *)uri
{
    [_prefixs addObject:[NSDictionary dictionaryWithObjectsAndKeys:
                         prefix, @"p", uri, @"u", nil]];
}
- (NSString *)prefixsOfQuery
{
    NSMutableString *ret= [NSMutableString string];
    NSEnumerator *prefixsEnum= [_prefixs objectEnumerator];
    NSDictionary *dic;
    while(dic= [prefixsEnum nextObject]) {
        [ret appendFormat:@"PREFIX %@: <%@>\n", [dic objectForKey:@"p"], [dic objectForKey:@"u"]];
    }
    return [[ret retain] autorelease];
}
- (NSString *)prefixsOfTurtle
{
    NSMutableString *ret= [NSMutableString string];
    NSEnumerator *prefixsEnum= [_prefixs objectEnumerator];
    NSDictionary *dic;
    while(dic= [prefixsEnum nextObject]) {
        [ret appendFormat:@"@prefix %@: <%@> .\n", [dic objectForKey:@"p"], [dic objectForKey:@"u"]];
    }
    return [[ret retain] autorelease];
}
- (NSString *)queryWithString:(NSString *)query
{
    NSString *fullquery= [NSString stringWithFormat:@"%@%@", [self prefixsOfQuery], query];
    
    NSString *request= [NSString stringWithFormat:@"query=%@&soft-limit=%@", 
                        [fullquery stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding], @""];
    
    return [FourStore send:request url:_urlSPARQL method:@"POST"];
}
- (NSString *)addTurtle:(NSString *)turtle graph:(NSString *)graph
{
    NSString *fullturtle= [NSString stringWithFormat:@"%@%@", [self prefixsOfTurtle], turtle];
    
    NSString *request= [NSString stringWithFormat:@"mime-type=%@&data=%@&graph=%@", 
                        [@"application/x-turtle" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
                        [fullturtle stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
                        [graph stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
    
    return [FourStore send:request url:_urlDATA method:@"POST"];
}
//- (NSString *)setTurtle:(NSString *)turtle graph:(NSString *)graph
//{
//    NSString *fullturtle= [NSString stringWithFormat:@"%@%@", [self prefixsOfTurtle], turtle];
//
//    NSString *request= [fullturtle stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//
//    NSURL *url= [NSURL URLWithString:[NSString stringWithFormat:@"%@%@", [_urlDATA absoluteString], graph]];
//    
//    return [FourStore send:request url:url method:@"PUT"];
//}
- (NSString *)deleteWithGraph:(NSString *)graph
{
    NSURL *url= [NSURL URLWithString:[NSString stringWithFormat:@"%@%@", [_urlDATA absoluteString], graph]];

    return [FourStore send:@"" url:url method:@"DELETE"];
}
@end

使い方(?)

    FourStore *store= [[FourStore alloc] initWithEndpoint:@"http://localhost:8000/sparql/"];
    [store addPrefix:@"dc" uri:@"http://purl.org/dc/elements/1.1/"];
    
    if (1) {
        NSString *msg= [store addTurtle:@"<http://example.org/book/book1> dc:title \"SPARQL Tutorial\" ." 
                                  graph:@"http://example.org/book"];  
        NSLog(@"%@", msg);
    }
    if (1) {
        NSString *msg= [store queryWithString:
                        @"SELECT ?title \nWHERE {\nGRAPH <http://example.org/book> {\n<http://example.org/book/book1> <http://purl.org/dc/elements/1.1/title> ?title .\n}\n}\n"];
        NSLog(@"%@", msg);

    }
    if (1) {
        NSString *msg= [store queryWithString:
                        @"SELECT ?title \nWHERE {\nGRAPH <http://example.org/book> {\n<http://example.org/book/book1> dc:title ?title .\n}\n}\n"];
        NSLog(@"%@", msg);
        
    }
    if (1) {
        NSString *msg= [store deleteWithGraph:@"http://example.org/book"];
        NSLog(@"%@", msg);
    }
    
    [store release];

結果

(> 4s-backend-setup [KB])
> 4s-backend [KB]
> 4s-httpd -p 8000 -U [KB]

> 200 added successfully
This is a 4store SPARQL server v1.1.3-54-gd8008fc

> <?xml version="1.0"?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#">
  <head>
    <variable name="title"/>
  </head>
  <results>
    <result>
      <binding name="title"><literal>SPARQL Tutorial</literal></binding>
    </result>
  </results>
</sparql>

> <?xml version="1.0"?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#">
  <head>
    <variable name="title"/>
  </head>
  <results>
    <result>
      <binding name="title"><literal>SPARQL Tutorial</literal></binding>
    </result>
  </results>
</sparql>

> 200 deleted successfully
This is a 4store SPARQL server v1.1.3-54-gd8008fc