ARResource+Private.m

Go to the documentation of this file.

// ActiveResourceKit ARResource+Private.m
//
// Copyright © 2011, 2012, Roy Ratcliffe, Pioneering Software, United Kingdom
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS," WITHOUT WARRANTY OF ANY KIND, EITHER
// EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO
// EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
//------------------------------------------------------------------------------

#import "ARResource+Private.h"
#import "ARService+Private.h"
#import "ARHTTPResponse.h"
#import "ARErrors.h"

NSNumber *ARIDFromResponse(ARHTTPResponse *response)
{
    NSString *location = [[response headerFields] objectForKey:@"Location"];
    if (location == nil)
    {
        return nil;
    }
    NSRegularExpression *re = [NSRegularExpression regularExpressionWithPattern:@"\\/([^\\/]*?)(\\.\\w+)?$" options:0 error:NULL];
    NSTextCheckingResult *match = [re firstMatchInString:location options:0 range:NSMakeRange(0, [location length])];
    if (match == nil || [match numberOfRanges] < 2)
    {
        return nil;
    }
    NSString *string = [location substringWithRange:[match rangeAtIndex:1]];
    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    return [numberFormatter numberFromString:string];
}

BOOL ARResponseCodeAllowsBody(NSInteger code)
{
    return !((100 <= code && code <= 199) || code == 204 || code == 304);
}

@implementation ARResource(Private)

- (void)updateWithCompletionHandler:(void (^)(ARHTTPResponse *response, NSError *error))completionHandler
{
    NSString *path = [[self serviceLazily] elementPathForID:[self ID] prefixOptions:[self prefixOptions] queryOptions:nil];
    [[self serviceLazily] put:path body:[self encode] completionHandler:^(ARHTTPResponse *response, id attributes, NSError *error) {
        if (attributes)
        {
            if ([attributes isKindOfClass:[NSDictionary class]])
            {
                [self loadAttributesFromResponse:response attributes:attributes];
                completionHandler(response, nil);
            }
            else
            {
                completionHandler(response, [NSError errorWithDomain:ARErrorDomain code:ARUnsupportedRootObjectTypeError userInfo:nil]);
            }
        }
        else
        {
            completionHandler(response, error);
        }
    }];
}

- (void)createWithCompletionHandler:(void (^)(ARHTTPResponse *response, NSError *error))completionHandler
{
    NSString *path = [[self serviceLazily] collectionPathWithPrefixOptions:nil queryOptions:nil];
    [[self serviceLazily] post:path body:[self encode] completionHandler:^(ARHTTPResponse *response, id attributes, NSError *error) {
        if (attributes)
        {
            if ([attributes isKindOfClass:[NSDictionary class]])
            {
                [self setID:ARIDFromResponse(response)];
                [self loadAttributesFromResponse:response attributes:attributes];
                completionHandler(response, nil);
            }
            else
            {
                completionHandler(response, [NSError errorWithDomain:ARErrorDomain code:ARUnsupportedRootObjectTypeError userInfo:nil]);
            }
        }
        else
        {
            completionHandler(response, error);
        }
    }];
}

- (void)loadAttributesFromResponse:(ARHTTPResponse *)response attributes:(NSDictionary *)attributes
{
    NSDictionary *headerFields;
    NSString *contentLength;
    
    if (ARResponseCodeAllowsBody([response code]) &&
        ((contentLength = [headerFields = [response headerFields] objectForKey:@"Content-Length"]) == nil || ![contentLength isEqualToString:@"0"]))
    {
        [self loadAttributes:attributes removeRoot:YES];
        [self setPersisted:YES];
    }
}

- (NSString *)elementPathWithOptions:(NSDictionary *)options
{
    return [[self serviceLazily] elementPathForID:[self ID] prefixOptions:options ? options : [self prefixOptions] queryOptions:nil];
}

//------------------------------------------------------------------------------
#pragma mark                                            Active Model Conversions
//------------------------------------------------------------------------------

- (NSArray *)toKey
{
    return [self persisted] ? [NSArray arrayWithObject:[self ID]] : nil;
}

- (NSString *)toParam
{
    // How does -componentsJoinedByString:aString handle non-string elements?
    return [self persisted] ? [[self toKey] componentsJoinedByString:@"-"] : nil;
}

@end