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- (OFEnumerator*)objectEnumerator
{
return [[[XMPPSRVEnumerator alloc] initWithList: _list] autorelease];
}
@end
@implementation XMPPSRVEnumerator
- initWithList: (OFList*)list_
{
self = [super init];
@try {
list = [list_ copy];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (id)nextObject
{
XMPPSRVEntry *ret = nil;
of_list_object_t *iter;
uint32_t totalWeight = 0;
if (done)
return nil;
if (listIter == NULL)
listIter = [list firstListObject];
if (listIter == NULL)
return nil;
if (subListCopy == nil)
subListCopy = [listIter->object copy];
for (iter = [subListCopy firstListObject]; iter != NULL;
iter = iter->next) {
totalWeight += [iter->object weight];
[iter->object setAccumulatedWeight: totalWeight];
}
if ([subListCopy count] > 0) {
uint32_t randomWeight;
RAND_pseudo_bytes((uint8_t*)&randomWeight, sizeof(uint32_t));
randomWeight %= (totalWeight + 1);
for (iter = [subListCopy firstListObject]; iter != NULL;
iter = iter->next) {
if ([iter->object accumulatedWeight] >= randomWeight) {
ret = [[iter->object retain] autorelease];
[subListCopy removeListObject: iter];
break;
}
}
}
if ([subListCopy count] == 0) {
[subListCopy release];
subListCopy = nil;
listIter = listIter->next;
if (listIter == NULL)
done = true;
}
return ret;
}
- (void)reset
{
listIter = NULL;
[subListCopy release];
subListCopy = nil;
done = false;
}
@end
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- (OFEnumerator*)objectEnumerator
{
return [[[XMPPSRVEnumerator alloc] initWithList: _list] autorelease];
}
@end
@implementation XMPPSRVEnumerator
- initWithList: (OFList*)list
{
self = [super init];
@try {
_list = [list copy];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (id)nextObject
{
XMPPSRVEntry *ret = nil;
of_list_object_t *iter;
uint32_t totalWeight = 0;
if (_done)
return nil;
if (_listIter == NULL)
_listIter = [_list firstListObject];
if (_listIter == NULL)
return nil;
if (_subListCopy == nil)
_subListCopy = [_listIter->object copy];
for (iter = [_subListCopy firstListObject]; iter != NULL;
iter = iter->next) {
totalWeight += [iter->object weight];
[iter->object setAccumulatedWeight: totalWeight];
}
if ([_subListCopy count] > 0) {
uint32_t randomWeight;
RAND_pseudo_bytes((uint8_t*)&randomWeight, sizeof(uint32_t));
randomWeight %= (totalWeight + 1);
for (iter = [_subListCopy firstListObject]; iter != NULL;
iter = iter->next) {
if ([iter->object accumulatedWeight] >= randomWeight) {
ret = [[iter->object retain] autorelease];
[_subListCopy removeListObject: iter];
break;
}
}
}
if ([_subListCopy count] == 0) {
[_subListCopy release];
_subListCopy = nil;
_listIter = _listIter->next;
if (_listIter == NULL)
_done = true;
}
return ret;
}
- (void)reset
{
_listIter = NULL;
[_subListCopy release];
_subListCopy = nil;
_done = false;
}
@end
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