code.grnet.gr Git - pithos-macos/blob - pithos-macos/SharingDictionaryTransformer.m

   1 //
   2 //  SharingDictionaryTransformer.m
   3 //  pithos-macos
   4 //
   5 // Copyright 2011 GRNET S.A. All rights reserved.
   6 //
   7 // Redistribution and use in source and binary forms, with or
   8 // without modification, are permitted provided that the following
   9 // conditions are met:
  10 //
  11 //   1. Redistributions of source code must retain the above
  12 //      copyright notice, this list of conditions and the following
  13 //      disclaimer.
  14 //
  15 //   2. Redistributions in binary form must reproduce the above
  16 //      copyright notice, this list of conditions and the following
  17 //      disclaimer in the documentation and/or other materials
  18 //      provided with the distribution.
  19 //
  20 // THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  21 // OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  24 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  27 // USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  28 // AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30 // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31 // POSSIBILITY OF SUCH DAMAGE.
  32 //
  33 // The views and conclusions contained in the software and
  34 // documentation are those of the authors and should not be
  35 // interpreted as representing official policies, either expressed
  36 // or implied, of GRNET S.A.
  37
  38 #import "SharingDictionaryTransformer.h"
  39
  40 @implementation SharingDictionaryTransformer
  41
  42 + (Class)transformedValueClass {
  43         return [NSMutableDictionary class];
  44 }
  45
  46 + (BOOL)allowsReverseTransformation {
  47         return YES;
  48 }
  49
  50 - (id)transformedValue:(id)value {
  51     NSMutableDictionary *sharingDictionary = [NSMutableDictionary dictionary];
  52
  53     if (value == nil)
  54         return sharingDictionary;
  55
  56     NSRange readRange = [(NSString *)value rangeOfString:@"read=" options:NSCaseInsensitiveSearch];
  57     NSUInteger readStart = readRange.location + readRange.length;
  58     NSRange writeRange = [(NSString *)value rangeOfString:@"write=" options:NSCaseInsensitiveSearch];
  59     NSUInteger writeStart = writeRange.location + writeRange.length;
  60     if (writeRange.length == 0) {
  61         if (readRange.length == 0) {
  62             return sharingDictionary;
  63         }
  64         for (NSString *readUser in [[(NSString *)value substringFromIndex:readStart] componentsSeparatedByString:@","]) {
  65             [sharingDictionary setValue:@"read only" forKey:readUser];
  66         }
  67     } else if (readRange.length == 0) {
  68         for (NSString *writeUser in [[(NSString *)value substringFromIndex:writeStart] componentsSeparatedByString:@","]) {
  69             [sharingDictionary setValue:@"read/write" forKey:writeUser];
  70         }
  71     } else if (readRange.location < writeRange.location) {
  72         NSRange semicolonRange = [(NSString *)value rangeOfString:@";"];
  73         for (NSString *readUser in [[(NSString *)value substringWithRange:NSMakeRange(readStart, semicolonRange.location - readStart)] componentsSeparatedByString:@","]) {
  74             [sharingDictionary setValue:@"read only" forKey:readUser];
  75         }
  76         for (NSString *writeUser in [[(NSString *)value substringFromIndex:writeStart] componentsSeparatedByString:@","]) {
  77             [sharingDictionary setValue:@"read/write" forKey:writeUser];
  78         }
  79     } else {
  80         NSRange semicolonRange = [(NSString *)value rangeOfString:@";"];
  81         for (NSString *readUser in [[(NSString *)value substringFromIndex:readStart] componentsSeparatedByString:@","]) {
  82             [sharingDictionary setValue:@"read only" forKey:readUser];
  83         }
  84         for (NSString *writeUser in [[(NSString *)value substringWithRange:NSMakeRange(writeStart, semicolonRange.location - writeStart)] componentsSeparatedByString:@","]) {
  85             [sharingDictionary setValue:@"read/write" forKey:writeUser];
  86         }
  87     }
  88
  89     return sharingDictionary;
  90 }
  91
  92 - (id)reverseTransformedValue:(id)value {
  93     if ((value == nil) || ([(NSMutableDictionary *)value count] == 0))
  94         return nil;
  95
  96     NSString *readSharingString = nil;
  97     NSArray *readUsers = [(NSMutableDictionary *)value allKeysForObject:@"read only"];
  98     if ([readUsers count])
  99         readSharingString = [NSString stringWithFormat:@"read=%@", [readUsers componentsJoinedByString:@","]];
 100     NSString *writeSharingString = nil;
 101
 102     NSArray *writeUsers = [(NSMutableDictionary *)value allKeysForObject:@"read/write"];
 103     if ([writeUsers count])
 104         writeSharingString = [NSString stringWithFormat:@"write=%@", [writeUsers componentsJoinedByString:@","]];
 105
 106
 107     if (readSharingString) {
 108         if (writeSharingString) {
 109             return [NSString stringWithFormat:@"%@;%@", readSharingString, writeSharingString];
 110         }
 111         return readSharingString;
 112     } else {
 113         return writeSharingString;
 114     }
 115 }
 116
 117 + (void)initialize {
 118     [[NSValueTransformer class] setValueTransformer:[self new] forName:@"SharingDictionaryTransformer"];
 119 }
 120
 121 @end