1/*! 2 @header ECCache 3 @abstract Module of Encore 4 5 @availability OS X, GNUstep 6 @copyright 2004, 2005, 2006 Oliver Langer 7 8 Author: Oliver Langer 9 10 This library is free software; you can redistribute it and/or 11 modify it under the terms of the GNU Lesser General Public 12 License as published by the Free Software Foundation; either 13 version 2.1 of the License, or (at your option) any later version. 14 15 This library is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 Lesser General Public License for more details. 19 20 You should have received a copy of the GNU Lesser General Public 21 License along with this library; if not, write to the Free Software 22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 24 <pre> 25 ------------------------------------------------------------------------- 26 Modification history 27 28 24.02.05 ola initial version 29 22.08.06 ola license changed 30 ------------------------------------------------------------------------- 31 </pre> 32*/ 33 34#include <Encore/ECIterator.h> 35#include <Encore/ECCache.h> 36#include <Encore/ECArrayIterator.h> 37#include <Encore/ECCacheItem.h> 38#include <Encore/ECMemory.h> 39 40 41@implementation ECCache 42 43- init { 44 self = [super init]; 45 46 self->keyToCacheItem = [[NSMutableDictionary alloc] init]; 47 self->lock = [[NSLock alloc] init]; 48 49 return self; 50} 51 52 53- (void) dealloc { 54 [self->keyToCacheItem release]; 55 [self->lock release]; 56 57 [super dealloc]; 58} 59 60 61- (id) initWithCoder: (NSCoder *) decoder { 62 self = [super init]; 63 64 self->keyToCacheItem = [[decoder decodeObject] retain]; 65 self->lock = [[NSLock alloc] init]; 66 67 return self; 68} 69 70 71- (void) encodeWithCoder: (NSCoder *) encoder { 72 [encoder encodeObject: self->keyToCacheItem]; 73} 74 75 76- addObject: (id) anObject forKey: (id <NSCopying>) aKey { 77 ECCacheItem *newItem; 78 79 EC_AUTORELEASEPOOL_BEGIN 80 81 [self->lock lock]; 82 83 if( [self objectExistsForKey: aKey] ) { 84 [[[ECIllegalArgumentException alloc] 85 initWithArgumentInfo: @"Given key is already in use" ] raise]; 86 } 87 88 newItem = [[ECCacheItem alloc] initWithObject: anObject ]; 89 [newItem autorelease]; 90 [self->keyToCacheItem setObject: newItem forKey: aKey]; 91 92 [self->lock unlock]; 93 94 EC_AUTORELEASEPOOL_END 95 96 return self; 97} 98 99 100- (id <ECIterator>) allKeys { 101 return [[[ECArrayIterator alloc] 102 initWithArray: [self->keyToCacheItem allKeys]] autorelease]; 103} 104 105 106- (BOOL) objectExistsForKey: (id) aKey { 107 return nil != [self->keyToCacheItem objectForKey: aKey]; 108} 109 110 111- objectForKey: (id) aKey incrementRefCounter: (BOOL) doIncrement { 112 ECCacheItem *item; 113 id toReturn = nil; 114 115 [self->lock lock]; 116 117 item = (ECCacheItem *) [self->keyToCacheItem objectForKey: aKey]; 118 119 if( nil != item ) { 120 toReturn = [item cachedObject]; 121 122 if( doIncrement ) { 123 [item incrementCacheReferenceCount]; 124 } 125 } 126 127 [self->lock unlock]; 128 129 return toReturn; 130} 131 132 133- (unsigned int) referenceCounterOfObjectForKey: (id) aKey { 134 unsigned int toReturn; 135 ECCacheItem *item; 136 137 item = (ECCacheItem *) [self->keyToCacheItem objectForKey: aKey]; 138 139 if( nil != item ) { 140 toReturn = [item cacheReferenceCount]; 141 } else { 142 toReturn = 0; 143 } 144 145 return toReturn; 146} 147 148 149- (void) decrementRefCounterForKey: (id) aKey { 150 ECCacheItem *item; 151 152 [self->lock lock]; 153 154 item = (ECCacheItem *) [self->keyToCacheItem objectForKey: aKey]; 155 156 if( nil != item ) { 157 [item decrementCacheReferenceCount]; 158 if( [item cacheReferenceCount] < 1 ) { 159 [self->keyToCacheItem removeObjectForKey: aKey]; 160 } 161 } 162 163 [self->lock unlock]; 164} 165 166 167- (void) removeObjectForKey: (id) aKey { 168 ECCacheItem *item; 169 170 [self->lock lock]; 171 172 item = (ECCacheItem *) [self->keyToCacheItem objectForKey: aKey]; 173 if( nil != item ) { 174 [self->keyToCacheItem removeObjectForKey: aKey]; 175 } 176 177 [self->lock unlock]; 178} 179@end 180