Synnefo » Pithos MacOS Client

//

//  SharingDictionaryTransformer.m

//  pithos-macos

//

// Copyright 2011 GRNET S.A. All rights reserved.

//

// Redistribution and use in source and binary forms, with or

// without modification, are permitted provided that the following

// conditions are met:

// 

//   1. Redistributions of source code must retain the above

//      copyright notice, this list of conditions and the following

//      disclaimer.

// 

//   2. Redistributions in binary form must reproduce the above

//      copyright notice, this list of conditions and the following

//      disclaimer in the documentation and/or other materials

//      provided with the distribution.

// 

// THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

// USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

// POSSIBILITY OF SUCH DAMAGE.

// 

// The views and conclusions contained in the software and

// documentation are those of the authors and should not be

// interpreted as representing official policies, either expressed

// or implied, of GRNET S.A.

#import "SharingDictionaryTransformer.h"

@implementation SharingDictionaryTransformer

+ (Class)transformedValueClass {

	return [NSMutableDictionary class];

}

+ (BOOL)allowsReverseTransformation {

	return YES;

}

- (id)transformedValue:(id)value {

    NSMutableDictionary *sharingDictionary = [NSMutableDictionary dictionary];

    if (value == nil)

        return sharingDictionary;

    NSRange readRange = [(NSString *)value rangeOfString:@"read=" options:NSCaseInsensitiveSearch];

    NSUInteger readStart = readRange.location + readRange.length;

    NSRange writeRange = [(NSString *)value rangeOfString:@"write=" options:NSCaseInsensitiveSearch];

    NSUInteger writeStart = writeRange.location + writeRange.length;

    if (writeRange.length == 0) {

        if (readRange.length == 0) {

            return sharingDictionary;

        }

        for (NSString *readUser in [[(NSString *)value substringFromIndex:readStart] componentsSeparatedByString:@","]) {

            [sharingDictionary setValue:@"read" forKey:readUser];

        }

    } else if (readRange.length == 0) {

        for (NSString *writeUser in [[(NSString *)value substringFromIndex:writeStart] componentsSeparatedByString:@","]) {

            [sharingDictionary setValue:@"write" forKey:writeUser];

        }

    } else if (readRange.location < writeRange.location) {

        NSRange semicolonRange = [(NSString *)value rangeOfString:@";"];

        for (NSString *readUser in [[(NSString *)value substringWithRange:NSMakeRange(readStart, semicolonRange.location - readStart)] componentsSeparatedByString:@","]) {

            [sharingDictionary setValue:@"read" forKey:readUser];

        }

        for (NSString *writeUser in [[(NSString *)value substringFromIndex:writeStart] componentsSeparatedByString:@","]) {

            [sharingDictionary setValue:@"write" forKey:writeUser];

        }        

    } else {

        NSRange semicolonRange = [(NSString *)value rangeOfString:@";"];

        for (NSString *readUser in [[(NSString *)value substringFromIndex:readStart] componentsSeparatedByString:@","]) {

            [sharingDictionary setValue:@"read" forKey:readUser];

        }                

        for (NSString *writeUser in [[(NSString *)value substringWithRange:NSMakeRange(writeStart, semicolonRange.location - writeStart)] componentsSeparatedByString:@","]) {

            [sharingDictionary setValue:@"write" forKey:writeUser];

        }

    }

    return sharingDictionary;

}

- (id)reverseTransformedValue:(id)value {

    if ((value == nil) || ([(NSMutableDictionary *)value count] == 0))

        return nil;

    NSString *readSharingString = nil;

    NSArray *readUsers = [(NSMutableDictionary *)value allKeysForObject:@"read"];

    if ([readUsers count])

        readSharingString = [NSString stringWithFormat:@"read=%@", [readUsers componentsJoinedByString:@","]];

    NSString *writeSharingString = nil;

    NSArray *writeUsers = [(NSMutableDictionary *)value allKeysForObject:@"write"];

    if ([writeUsers count])

        writeSharingString = [NSString stringWithFormat:@"write=%@", [writeUsers componentsJoinedByString:@","]];

    if (readSharingString) {

        if (writeSharingString) {

            return [NSString stringWithFormat:@"%@;%@", readSharingString, writeSharingString];

        }

        return readSharingString;

    } else {

        return writeSharingString;

    }

}

+ (void)initialize {

    [[NSValueTransformer class] setValueTransformer:[self new] forName:@"SharingDictionaryTransformer"];

}

@end