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我试图从给定的起始路径建模文件系统的结构。目标是从该路径开始创建文件系统的标准NSOutlineView。使用NSDirectoryEnumerator建模文件系统
我有一个模型对象fileSystemItem。它具有以下（非常标准）的关系和属性：
parentItem（指向另一fileSystemItem对象）isLeaf（YES为文件;NO为文件夹）childrenItems（其他fileSystemItems阵列）fullPath（NSString;对象的文件路径）
我的问题是：我如何使用NSDirectoryEnumerator来构建模型？如果我这样做：
// NOTE: can't do "while (file = [dirEnum nextObject]) {...} because that sets
// file to an auto-released string that doesn't get released until after ALL
// iterations of the loop are complete. For large directories, that means our
// memory use spikes to hundreds of MBs. So we do this instead to ensure that
// the "file" string is released at the end of each iteration and our overall
// memory footprint stays low.
NSDirectoryEnumerator *dirEnum = [aFileManager enumeratorAtPath:someStartingPath];
BOOL keepRunning = YES;
while (keepRunning)
{
NSAutoreleasePool *innerPool = [[NSAutoreleasePool alloc] init];
NSString *file = [dirEnum nextObject];
if (file == nil) break;
// ... examine "file". Create a fileSystemItem object to represent this item.
// If it's a folder, we need to create a fileSystemItem for each item in the folder
// and each fileSystemItem's "parentItem" relationship needs to be set to the
// fileSystemItem we're creating right here for "file." How can I do this inside
// the directoryEnumerator, because as soon as we go to the next iteration of the
// loop (to handle the first item in "file" if "file" is a folder), we lose the
// reference to the fileSystemItem we created in THIS iteration of the loop for
// "file". Hopefully that makes sense...
[innerPool drain];
}
我可以看到如何建立模型，如果我写一个递归函数，着眼于每个项目在startingPath，如果该项目是一个文件夹，该文件夹等再次调用自身上。但我怎样才能建立与NSDirectoryEnumerator模型？我的意思是，据说这就是班级存在的原因，对吧？