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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div id="projectname">Nimbus
 <span id="projectnumber">0.9.3 - <a href="http://github.com/jverkoey/nimbus">Nimbus is proudly hosted on Github</a></span>
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<div class="title">src/core/src/NIDataStructures.m</div> </div>
</div>
<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">//</span>
<a name="l00002"></a>00002 <span class="comment">// Copyright 2011 Jeff Verkoeyen</span>
<a name="l00003"></a>00003 <span class="comment">//</span>
<a name="l00004"></a>00004 <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span>
<a name="l00005"></a>00005 <span class="comment">// you may not use this file except in compliance with the License.</span>
<a name="l00006"></a>00006 <span class="comment">// You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment">//</span>
<a name="l00010"></a>00010 <span class="comment">// Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span>
<a name="l00012"></a>00012 <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment">// See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment">// limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment">//</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#import "NIDataStructures.h"</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#import "NIDebuggingTools.h"</span>
<a name="l00020"></a>00020 <span class="preprocessor">#import "NIPreprocessorMacros.h"</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="keyword">@interface </span><a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a>()
<a name="l00023"></a>00023
<a name="l00029"></a>00029 <span class="keyword">@property</span> (nonatomic, readonly, assign) <span class="keyword">struct</span> NILinkedListNode* head;
<a name="l00030"></a>00030 <span class="keyword">@property</span> (nonatomic, readonly, assign) <span class="keyword">struct</span> NILinkedListNode* tail;
<a name="l00031"></a>00031 <span class="keyword">@property</span> (nonatomic, readwrite, assign) NSUInteger <a class="code" href="interface_n_i_linked_list.html#a18b75612a8b80c670a29bf8ee92f1263" title="Returns the number of objects currently in the linked list.">count</a>;
<a name="l00032"></a>00032 <span class="keyword">@property</span> (nonatomic, readwrite, assign) <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> modificationNumber;
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="keyword">@end</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="preprocessor">#pragma mark -</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span>
<a name="l00039"></a>00039
<a name="l00043"></a>00043
<a name="l00052"></a>00052 <span class="keyword">@interface </span>NILinkedListEnumerator : NSEnumerator {
<a name="l00053"></a>00053 <span class="keyword">@private</span>
<a name="l00054"></a>00054 <a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a>* _ll;
<a name="l00055"></a>00055 <span class="keyword">struct </span>NILinkedListNode* _iterator;
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057
<a name="l00061"></a>00061 - (id)initWithLinkedList:(<a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a> *)ll;
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keyword">@end</span>
<a name="l00064"></a>00064
<a name="l00065"></a>00065
<a name="l00069"></a>00069 <span class="keyword">@implementation </span>NILinkedListEnumerator
<a name="l00070"></a>00070
<a name="l00071"></a>00071
<a name="l00073"></a>00073 - (void)dealloc {
<a name="l00074"></a>00074 <a class="code" href="group___preprocessor-_macros.html#ga5d2e99251aeb3ddb687e27f72336e5db" title="Release and assign nil to an object.">NI_RELEASE_SAFELY</a>(_ll);
<a name="l00075"></a>00075 _iterator = nil;
<a name="l00076"></a>00076
<a name="l00077"></a>00077 [<span class="keyword">super</span> dealloc];
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079
<a name="l00080"></a>00080
<a name="l00082"></a>00082 - (id)initWithLinkedList:(<a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a> *)ll {
<a name="l00083"></a>00083 <span class="keywordflow">if</span> ((<span class="keyword">self</span> = [super init])) {
<a name="l00084"></a>00084 _ll = [ll retain];
<a name="l00085"></a>00085 _iterator = ll.head;
<a name="l00086"></a>00086 }
<a name="l00087"></a>00087 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089
<a name="l00090"></a>00090
<a name="l00092"></a>00092 - (id)nextObject {
<a name="l00093"></a>00093 <span class="keywordtype">id</span> <span class="keywordtype">object</span> = nil;
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="comment">// Iteration step.</span>
<a name="l00096"></a>00096 <span class="keywordflow">if</span> (nil != _iterator) {
<a name="l00097"></a>00097 <span class="keywordtype">object</span> = _iterator->object;
<a name="l00098"></a>00098 _iterator = _iterator->next;
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="comment">// Completion step.</span>
<a name="l00101"></a>00101 } <span class="keywordflow">else</span> {
<a name="l00102"></a>00102 <span class="comment">// As per the guidelines in the Objective-C docs for enumerators, we release the linked</span>
<a name="l00103"></a>00103 <span class="comment">// list when we are finished enumerating.</span>
<a name="l00104"></a>00104 <a class="code" href="group___preprocessor-_macros.html#ga5d2e99251aeb3ddb687e27f72336e5db" title="Release and assign nil to an object.">NI_RELEASE_SAFELY</a>(_ll);
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="comment">// We don't have to set _iterator to nil here because is already is.</span>
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108 <span class="keywordflow">return</span> object;
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keyword">@end</span>
<a name="l00113"></a>00113
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="preprocessor">#pragma mark -</span>
<a name="l00116"></a>00116 <span class="preprocessor"></span>
<a name="l00117"></a>00117
<a name="l00121"></a>00121 <span class="keyword">@implementation </span><a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a>
<a name="l00122"></a>00122
<a name="l00123"></a>00123 <span class="keyword">@synthesize</span> <a class="code" href="interface_n_i_linked_list.html#a18b75612a8b80c670a29bf8ee92f1263" title="Returns the number of objects currently in the linked list.">count</a> = _count;
<a name="l00124"></a>00124 <span class="keyword">@synthesize</span> head = _head;
<a name="l00125"></a>00125 <span class="keyword">@synthesize</span> tail = _tail;
<a name="l00126"></a>00126 <span class="keyword">@synthesize</span> modificationNumber = _modificationNumber;
<a name="l00127"></a>00127
<a name="l00128"></a>00128
<a name="l00130"></a>00130 - (void)dealloc {
<a name="l00131"></a>00131 [<span class="keyword">self</span> removeAllObjects];
<a name="l00132"></a>00132
<a name="l00133"></a>00133 [<span class="keyword">super</span> dealloc];
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135
<a name="l00136"></a>00136
<a name="l00139"></a>00139 <span class="preprocessor">#pragma mark Linked List Creation</span>
<a name="l00140"></a>00140 <span class="preprocessor"></span>
<a name="l00141"></a>00141
<a name="l00143"></a><a class="code" href="interface_n_i_linked_list.html#a33b030b2a3c23c237735d347e7bfbeea">00143</a> + (<a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a> *)<a class="code" href="interface_n_i_linked_list.html#a33b030b2a3c23c237735d347e7bfbeea" title="Returns a newly allocated and autoreleased linked list.">linkedList</a> {
<a name="l00144"></a>00144 <span class="keywordflow">return</span> [[[[<span class="keyword">self</span> class] alloc] init] autorelease];
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00147"></a>00147
<a name="l00149"></a><a class="code" href="interface_n_i_linked_list.html#a864c1485a3d2e39cbee7b74c90471f96">00149</a> + (<a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a> *)linkedListWithArray:(NSArray *)array {
<a name="l00150"></a>00150 <span class="keywordflow">return</span> [[[[<span class="keyword">self</span> class] alloc] initWithArray:array] autorelease];
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152
<a name="l00153"></a>00153
<a name="l00155"></a><a class="code" href="interface_n_i_linked_list.html#a8d50d5a46ef86d8b7e6097e657a22184">00155</a> - (id)initWithArray:(NSArray *)anArray {
<a name="l00156"></a>00156 <span class="keywordflow">if</span> ((<span class="keyword">self</span> = [<span class="keyword">self</span> init])) {
<a name="l00157"></a>00157 <span class="keywordflow">for</span> (<span class="keywordtype">id</span> <span class="keywordtype">object</span> in anArray) {
<a name="l00158"></a>00158 [<span class="keyword">self</span> <a class="code" href="interface_n_i_linked_list.html#a424313c1e697b5ba6a136be7a7d8dd3e" title="Appends an object to the linked list.">addObject</a>:object];
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00162"></a>00162 }
<a name="l00163"></a>00163
<a name="l00164"></a>00164
<a name="l00167"></a>00167 <span class="preprocessor">#pragma mark Private Methods</span>
<a name="l00168"></a>00168 <span class="preprocessor"></span>
<a name="l00169"></a>00169
<a name="l00171"></a>00171 - (void)_eraseNode:(struct NILinkedListNode *)node {
<a name="l00172"></a>00172 [node->object release];
<a name="l00173"></a>00173 free(node);
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175
<a name="l00176"></a>00176
<a name="l00179"></a>00179 <span class="preprocessor">#pragma mark NSCopying</span>
<a name="l00180"></a>00180 <span class="preprocessor"></span>
<a name="l00181"></a>00181
<a name="l00183"></a>00183 - (id)copyWithZone:(NSZone *)zone {
<a name="l00184"></a>00184 <a class="code" href="interface_n_i_linked_list.html" title="A singly linked list implementation.">NILinkedList</a>* copy = [[[<span class="keyword">self</span> class] allocWithZone:zone] init];
<a name="l00185"></a>00185
<a name="l00186"></a>00186 <span class="keyword">struct </span>NILinkedListNode* node = _head;
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="keywordflow">while</span> (0 != node) {
<a name="l00189"></a>00189 [copy <a class="code" href="interface_n_i_linked_list.html#a424313c1e697b5ba6a136be7a7d8dd3e" title="Appends an object to the linked list.">addObject</a>:node->object];
<a name="l00190"></a>00190 node = node->next;
<a name="l00191"></a>00191 }
<a name="l00192"></a>00192
<a name="l00193"></a>00193 copy.<a class="code" href="interface_n_i_linked_list.html#a18b75612a8b80c670a29bf8ee92f1263" title="Returns the number of objects currently in the linked list.">count</a> = <span class="keyword">self</span>.count;
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="keywordflow">return</span> copy;
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197
<a name="l00198"></a>00198
<a name="l00201"></a>00201 <span class="preprocessor">#pragma mark NSCoding</span>
<a name="l00202"></a>00202 <span class="preprocessor"></span>
<a name="l00203"></a>00203
<a name="l00205"></a>00205 - (void)encodeWithCoder:(NSCoder *)coder {
<a name="l00206"></a>00206 [coder encodeValueOfObjCType:@encode(NSUInteger) at:&_count];
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="keyword">struct </span>NILinkedListNode* node = _head;
<a name="l00209"></a>00209 <span class="keywordflow">while</span> (0 != node) {
<a name="l00210"></a>00210 [coder encodeObject:node->object];
<a name="l00211"></a>00211 node = node->next;
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213 }
<a name="l00214"></a>00214
<a name="l00215"></a>00215
<a name="l00217"></a>00217 - (id)initWithCoder:(NSCoder *)decoder {
<a name="l00218"></a>00218 <span class="keywordflow">if</span> ((<span class="keyword">self</span> = [super init])) {
<a name="l00219"></a>00219 <span class="comment">// We'll let addObject modify the count, so create a local count here so that we don't</span>
<a name="l00220"></a>00220 <span class="comment">// double count every object.</span>
<a name="l00221"></a>00221 NSUInteger count = 0;
<a name="l00222"></a>00222 [decoder decodeValueOfObjCType:@encode(NSUInteger) at:&count];
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="keywordflow">for</span> (NSUInteger ix = 0; ix < count; ++ix) {
<a name="l00225"></a>00225 <span class="keywordtype">id</span> <span class="keywordtype">object</span> = [decoder decodeObject];
<a name="l00226"></a>00226
<a name="l00227"></a>00227 [<span class="keyword">self</span> addObject:object];
<a name="l00228"></a>00228 }
<a name="l00229"></a>00229
<a name="l00230"></a>00230 <span class="comment">// Sanity check.</span>
<a name="l00231"></a>00231 NIDASSERT(count == <span class="keyword">self</span>.count);
<a name="l00232"></a>00232 }
<a name="l00233"></a>00233 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235
<a name="l00236"></a>00236
<a name="l00239"></a>00239 <span class="preprocessor">#pragma mark NSFastEnumeration</span>
<a name="l00240"></a>00240 <span class="preprocessor"></span>
<a name="l00241"></a>00241
<a name="l00243"></a>00243 - (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state
<a name="l00244"></a>00244 objects:(<span class="keywordtype">id</span> *)stackbuf
<a name="l00245"></a>00245 count:(NSUInteger)len {
<a name="l00246"></a>00246 <span class="comment">// Initialization condition.</span>
<a name="l00247"></a>00247 <span class="keywordflow">if</span> (0 == state->state) {
<a name="l00248"></a>00248 <span class="comment">// Whenever the linked list is modified, the modification number increases. This allows</span>
<a name="l00249"></a>00249 <span class="comment">// enumeration to bail out if the linked list is modified mid-flight.</span>
<a name="l00250"></a>00250 state->mutationsPtr = &_modificationNumber;
<a name="l00251"></a>00251 }
<a name="l00252"></a>00252
<a name="l00253"></a>00253 NSUInteger numberOfItemsReturned = 0;
<a name="l00254"></a>00254
<a name="l00255"></a>00255 <span class="comment">// If there is no _tail (i.e. this is an empty list) then this will end immediately.</span>
<a name="l00256"></a>00256 <span class="keywordflow">if</span> ((<span class="keyword">struct</span> NILinkedListNode *)state->state != _tail) {
<a name="l00257"></a>00257 state->itemsPtr = stackbuf;
<a name="l00258"></a>00258
<a name="l00259"></a>00259 <span class="keywordflow">if</span> (0 == state->state) {
<a name="l00260"></a>00260 <span class="comment">// Initialize the state here instead of above when we check 0 == state->state because</span>
<a name="l00261"></a>00261 <span class="comment">// for single item linked lists head == tail. If we initialized it in the initialization</span>
<a name="l00262"></a>00262 <span class="comment">// condition, state->state != _tail check would fail and we wouldn't return the single</span>
<a name="l00263"></a>00263 <span class="comment">// object.</span>
<a name="l00264"></a>00264 state->state = (<span class="keywordtype">unsigned</span> long)_head;
<a name="l00265"></a>00265 }
<a name="l00266"></a>00266
<a name="l00267"></a>00267 <span class="comment">// Return *at most* the number of request objects.</span>
<a name="l00268"></a>00268 <span class="keywordflow">while</span> ((0 != state->state) && (numberOfItemsReturned < len)) {
<a name="l00269"></a>00269 <span class="keyword">struct </span>NILinkedListNode* node = (<span class="keyword">struct </span>NILinkedListNode *)state->state;
<a name="l00270"></a>00270 stackbuf[numberOfItemsReturned] = node->object;
<a name="l00271"></a>00271 state->state = (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>)node->next;
<a name="l00272"></a>00272 ++numberOfItemsReturned;
<a name="l00273"></a>00273 }
<a name="l00274"></a>00274
<a name="l00275"></a>00275 <span class="keywordflow">if</span> (0 == state->state) {
<a name="l00276"></a>00276 <span class="comment">// Final step condition. We allow the above loop to overstep the end one iteration,</span>
<a name="l00277"></a>00277 <span class="comment">// because we rewind it one step here (to ensure that the next time enumeration occurs,</span>
<a name="l00278"></a>00278 <span class="comment">// state == _tail.</span>
<a name="l00279"></a>00279 state->state = (<span class="keywordtype">unsigned</span> long)_tail;
<a name="l00280"></a>00280 }
<a name="l00281"></a>00281
<a name="l00282"></a>00282 } <span class="comment">// else we've returned all of the items that we can; leave numberOfItemsReturned as 0 to</span>
<a name="l00283"></a>00283 <span class="comment">// signal that there is nothing left to be done.</span>
<a name="l00284"></a>00284
<a name="l00285"></a>00285 <span class="keywordflow">return</span> numberOfItemsReturned;
<a name="l00286"></a>00286 }
<a name="l00287"></a>00287
<a name="l00288"></a>00288
<a name="l00291"></a>00291 <span class="preprocessor">#pragma mark Public Methods</span>
<a name="l00292"></a>00292 <span class="preprocessor"></span>
<a name="l00293"></a>00293
<a name="l00295"></a><a class="code" href="interface_n_i_linked_list.html#a989a790899210a08e919780742be0fab">00295</a> - (id)firstObject {
<a name="l00296"></a>00296 <span class="keywordflow">return</span> (nil != _head) ? _head->object : nil;
<a name="l00297"></a>00297 }
<a name="l00298"></a>00298
<a name="l00299"></a>00299
<a name="l00301"></a><a class="code" href="interface_n_i_linked_list.html#a1aa16240ab9b1fa49b08850f71da3466">00301</a> - (id)lastObject {
<a name="l00302"></a>00302 <span class="keywordflow">return</span> (nil != _tail) ? _tail->object : nil;
<a name="l00303"></a>00303 }
<a name="l00304"></a>00304
<a name="l00305"></a>00305
<a name="l00308"></a>00308 <span class="preprocessor">#pragma mark Extended Methods</span>
<a name="l00309"></a>00309 <span class="preprocessor"></span>
<a name="l00310"></a>00310
<a name="l00312"></a><a class="code" href="interface_n_i_linked_list.html#a1e74e880b1a307a51d083e22c1b40390">00312</a> - (NSArray *)allObjects {
<a name="l00313"></a>00313 NSMutableArray* mutableArrayOfObjects = [[NSMutableArray alloc] initWithCapacity:self.count];
<a name="l00314"></a>00314
<a name="l00315"></a>00315 <span class="keywordflow">for</span> (<span class="keywordtype">id</span> <span class="keywordtype">object</span> in <span class="keyword">self</span>) {
<a name="l00316"></a>00316 [mutableArrayOfObjects addObject:object];
<a name="l00317"></a>00317 }
<a name="l00318"></a>00318
<a name="l00319"></a>00319 NSArray* arrayOfObjects = [mutableArrayOfObjects copy];
<a name="l00320"></a>00320 <a class="code" href="group___preprocessor-_macros.html#ga5d2e99251aeb3ddb687e27f72336e5db" title="Release and assign nil to an object.">NI_RELEASE_SAFELY</a>(mutableArrayOfObjects);
<a name="l00321"></a>00321 <span class="keywordflow">return</span> [arrayOfObjects autorelease];
<a name="l00322"></a>00322 }
<a name="l00323"></a>00323
<a name="l00324"></a>00324
<a name="l00326"></a><a class="code" href="interface_n_i_linked_list.html#ac4364e4541406af80cd5654b062b12b8">00326</a> - (BOOL)containsObject:(<span class="keywordtype">id</span>)anObject {
<a name="l00327"></a>00327 <span class="keywordflow">for</span> (<span class="keywordtype">id</span> <span class="keywordtype">object</span> in <span class="keyword">self</span>) {
<a name="l00328"></a>00328 <span class="keywordflow">if</span> (<span class="keywordtype">object</span> == anObject) {
<a name="l00329"></a>00329 <span class="keywordflow">return</span> YES;
<a name="l00330"></a>00330 }
<a name="l00331"></a>00331 }
<a name="l00332"></a>00332
<a name="l00333"></a>00333 <span class="keywordflow">return</span> NO;
<a name="l00334"></a>00334 }
<a name="l00335"></a>00335
<a name="l00336"></a>00336
<a name="l00338"></a><a class="code" href="interface_n_i_linked_list.html#a9feffa4a1b9a66312dd9495472c0554b">00338</a> - (<a class="code" href="class_n_s_string.html" title="For manipulating NSStrings.">NSString</a> *)description {
<a name="l00339"></a>00339 <span class="comment">// In general we should try to avoid cheating by using allObjects for memory performance reasons,</span>
<a name="l00340"></a>00340 <span class="comment">// but the description method is complex enough that it's not worth reinventing the wheel here.</span>
<a name="l00341"></a>00341 <span class="keywordflow">return</span> [[<span class="keyword">self</span> <a class="code" href="interface_n_i_linked_list.html#a1e74e880b1a307a51d083e22c1b40390" title="Returns an array containing the linked list's objects, or an empty array if the linked list has no ob...">allObjects</a>] description];
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343
<a name="l00344"></a>00344
<a name="l00346"></a><a class="code" href="interface_n_i_linked_list.html#a459824a248ba4917d0434643f29fd5f4">00346</a> - (id)objectAtLocation:(NILinkedListLocation *)location {
<a name="l00347"></a>00347 <span class="keywordflow">return</span> ((<span class="keyword">struct</span> NILinkedListNode *)location)->object;
<a name="l00348"></a>00348 }
<a name="l00349"></a>00349
<a name="l00350"></a>00350
<a name="l00352"></a><a class="code" href="interface_n_i_linked_list.html#af645be2ad2a961bf8edf10530dfa7266">00352</a> - (NSEnumerator *)objectEnumerator {
<a name="l00353"></a>00353 <span class="keywordflow">return</span> [[[NILinkedListEnumerator alloc] initWithLinkedList:self] autorelease];
<a name="l00354"></a>00354 }
<a name="l00355"></a>00355
<a name="l00356"></a>00356
<a name="l00358"></a><a class="code" href="interface_n_i_linked_list.html#a2446ec1db7456c41e3b27bf234b3dc62">00358</a> - (NILinkedListLocation *)locationOfObject:(<span class="keywordtype">id</span>)object {
<a name="l00359"></a>00359 <span class="keyword">struct </span>NILinkedListNode* node = _head;
<a name="l00360"></a>00360 <span class="keywordflow">while</span> (0 != node) {
<a name="l00361"></a>00361 <span class="keywordflow">if</span> (node->object == <span class="keywordtype">object</span>) {
<a name="l00362"></a>00362 <span class="keywordflow">return</span> (NILinkedListLocation *)node;
<a name="l00363"></a>00363 }
<a name="l00364"></a>00364 node = node->next;
<a name="l00365"></a>00365 }
<a name="l00366"></a>00366 <span class="keywordflow">return</span> 0;
<a name="l00367"></a>00367 }
<a name="l00368"></a>00368
<a name="l00369"></a>00369
<a name="l00371"></a><a class="code" href="interface_n_i_linked_list.html#a34f62252fbfc6df20e115e7c4d17031f">00371</a> - (void)removeObjectAtLocation:(NILinkedListLocation *)location {
<a name="l00372"></a>00372 <span class="keywordflow">if</span> (0 == location) {
<a name="l00373"></a>00373 <span class="keywordflow">return</span>;
<a name="l00374"></a>00374 }
<a name="l00375"></a>00375
<a name="l00376"></a>00376 <span class="keyword">struct </span>NILinkedListNode* node = (<span class="keyword">struct </span>NILinkedListNode *)location;
<a name="l00377"></a>00377
<a name="l00378"></a>00378 <span class="keywordflow">if</span> (0 != node->prev) {
<a name="l00379"></a>00379 node->prev->next = node->next;
<a name="l00380"></a>00380
<a name="l00381"></a>00381 } <span class="keywordflow">else</span> {
<a name="l00382"></a>00382 _head = node->next;
<a name="l00383"></a>00383 }
<a name="l00384"></a>00384
<a name="l00385"></a>00385 <span class="keywordflow">if</span> (0 != node->next) {
<a name="l00386"></a>00386 node->next->prev = node->prev;
<a name="l00387"></a>00387
<a name="l00388"></a>00388 } <span class="keywordflow">else</span> {
<a name="l00389"></a>00389 _tail = node->prev;
<a name="l00390"></a>00390 }
<a name="l00391"></a>00391
<a name="l00392"></a>00392 [<span class="keyword">self</span> _eraseNode:node];
<a name="l00393"></a>00393
<a name="l00394"></a>00394 --<span class="keyword">self</span>.count;
<a name="l00395"></a>00395 ++_modificationNumber;
<a name="l00396"></a>00396 }
<a name="l00397"></a>00397
<a name="l00398"></a>00398
<a name="l00400"></a><a class="code" href="interface_n_i_linked_list.html#a424313c1e697b5ba6a136be7a7d8dd3e">00400</a> - (NILinkedListLocation *)addObject:(<span class="keywordtype">id</span>)object {
<a name="l00401"></a>00401 <span class="comment">// nil objects can not be added to a linked list.</span>
<a name="l00402"></a>00402 NIDASSERT(nil != <span class="keywordtype">object</span>);
<a name="l00403"></a>00403 <span class="keywordflow">if</span> (nil == <span class="keywordtype">object</span>) {
<a name="l00404"></a>00404 <span class="keywordflow">return</span> nil;
<a name="l00405"></a>00405 }
<a name="l00406"></a>00406
<a name="l00407"></a>00407 <span class="keyword">struct </span>NILinkedListNode* node = malloc(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> NILinkedListNode));
<a name="l00408"></a>00408 memset(node, 0, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> NILinkedListNode));
<a name="l00409"></a>00409
<a name="l00410"></a>00410 node->object = [object retain];
<a name="l00411"></a>00411
<a name="l00412"></a>00412 <span class="comment">// Empty condition.</span>
<a name="l00413"></a>00413 <span class="keywordflow">if</span> (nil == _tail) {
<a name="l00414"></a>00414 _head = node;
<a name="l00415"></a>00415 _tail = node;
<a name="l00416"></a>00416
<a name="l00417"></a>00417 } <span class="keywordflow">else</span> {
<a name="l00418"></a>00418 <span class="comment">// Non-empty condition.</span>
<a name="l00419"></a>00419 _tail->next = (<span class="keyword">struct </span>NILinkedListNode*)node;
<a name="l00420"></a>00420 node->prev = (<span class="keyword">struct </span>NILinkedListNode*)_tail;
<a name="l00421"></a>00421 _tail = node;
<a name="l00422"></a>00422 }
<a name="l00423"></a>00423
<a name="l00424"></a>00424 ++<span class="keyword">self</span>.count;
<a name="l00425"></a>00425 ++_modificationNumber;
<a name="l00426"></a>00426
<a name="l00427"></a>00427 <span class="keywordflow">return</span> (NILinkedListLocation *)node;
<a name="l00428"></a>00428 }
<a name="l00429"></a>00429
<a name="l00430"></a>00430
<a name="l00432"></a><a class="code" href="interface_n_i_linked_list.html#a8cb984d5b874450338341a3a604c7ea6">00432</a> - (void)addObjectsFromArray:(NSArray *)array {
<a name="l00433"></a>00433 <span class="keywordflow">for</span> (<span class="keywordtype">id</span> <span class="keywordtype">object</span> in array) {
<a name="l00434"></a>00434 [<span class="keyword">self</span> <a class="code" href="interface_n_i_linked_list.html#a424313c1e697b5ba6a136be7a7d8dd3e" title="Appends an object to the linked list.">addObject</a>:object];
<a name="l00435"></a>00435 }
<a name="l00436"></a>00436 }
<a name="l00437"></a>00437
<a name="l00438"></a>00438
<a name="l00441"></a>00441 <span class="preprocessor">#pragma mark Mutable Methods</span>
<a name="l00442"></a>00442 <span class="preprocessor"></span>
<a name="l00443"></a>00443
<a name="l00445"></a><a class="code" href="interface_n_i_linked_list.html#add49cd92d036f3fa6bce44cbb12287e7">00445</a> - (void)removeAllObjects {
<a name="l00446"></a>00446 <span class="keyword">struct </span>NILinkedListNode* node = _head;
<a name="l00447"></a>00447 <span class="keywordflow">while</span> (nil != node) {
<a name="l00448"></a>00448 <span class="keyword">struct </span>NILinkedListNode* next = (<span class="keyword">struct </span>NILinkedListNode *)node->next;
<a name="l00449"></a>00449 [<span class="keyword">self</span> _eraseNode:node];
<a name="l00450"></a>00450 node = next;
<a name="l00451"></a>00451 }
<a name="l00452"></a>00452
<a name="l00453"></a>00453 _head = nil;
<a name="l00454"></a>00454 _tail = nil;
<a name="l00455"></a>00455
<a name="l00456"></a>00456 <span class="keyword">self</span>.count = 0;
<a name="l00457"></a>00457 ++_modificationNumber;
<a name="l00458"></a>00458 }
<a name="l00459"></a>00459
<a name="l00460"></a>00460
<a name="l00462"></a><a class="code" href="interface_n_i_linked_list.html#a8662894eef060157e9f25af267d0242f">00462</a> - (void)removeObject:(<span class="keywordtype">id</span>)object {
<a name="l00463"></a>00463 NILinkedListLocation* location = [<span class="keyword">self</span> <a class="code" href="interface_n_i_linked_list.html#a2446ec1db7456c41e3b27bf234b3dc62" title="Searches for an object in the linked list.">locationOfObject</a>:object];
<a name="l00464"></a>00464 <span class="keywordflow">if</span> (0 != location) {
<a name="l00465"></a>00465 [<span class="keyword">self</span> <a class="code" href="interface_n_i_linked_list.html#a34f62252fbfc6df20e115e7c4d17031f" title="Removes an object at a predetermined location.">removeObjectAtLocation</a>:location];
<a name="l00466"></a>00466 }
<a name="l00467"></a>00467 }
<a name="l00468"></a>00468
<a name="l00469"></a>00469
<a name="l00471"></a><a class="code" href="interface_n_i_linked_list.html#acf58608c591cd3350d92a51520ec5c56">00471</a> - (void)removeFirstObject {
<a name="l00472"></a>00472 [<span class="keyword">self</span> <a class="code" href="interface_n_i_linked_list.html#a34f62252fbfc6df20e115e7c4d17031f" title="Removes an object at a predetermined location.">removeObjectAtLocation</a>:_head];
<a name="l00473"></a>00473 }
<a name="l00474"></a>00474
<a name="l00475"></a>00475
<a name="l00477"></a><a class="code" href="interface_n_i_linked_list.html#ac6e78ad1db0893fb12421c309f2b6c09">00477</a> - (void)removeLastObject {
<a name="l00478"></a>00478 [<span class="keyword">self</span> <a class="code" href="interface_n_i_linked_list.html#a34f62252fbfc6df20e115e7c4d17031f" title="Removes an object at a predetermined location.">removeObjectAtLocation</a>:_tail];
<a name="l00479"></a>00479 }
<a name="l00480"></a>00480
<a name="l00481"></a>00481 <span class="keyword">@end</span>
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