Very early KRWorldBuilder scaffolding in progress.

New KRVector3 math functions

--HG--
extra : convert_revision : svn%3A7752d6cf-9f14-4ad2-affc-04f1e67b81a5/trunk%4058

KRWorldBuilder/KRWorldBuilder/KRWBFileSystemItem.m

@@ -0,0 +1,109 @@
+//
+//  KRWBFileSystemItem.m
+//  KRWorldBuilder
+//
+//  Created by Kearwood Gilbert on 12-05-12.
+//  Copyright (c) 2012 Kearwood Software. All rights reserved.
+//
+
+#import "KRWBFileSystemItem.h"
+
+
+@implementation KRWBFileSystemItem
+
+static KRWBFileSystemItem *rootItem = nil;
+static NSMutableArray *leafNode = nil;
+
++ (void)initialize {
+    if (self == [KRWBFileSystemItem class]) {
+        leafNode = [[NSMutableArray alloc] init];
+    }
+}
+
+- (id)initWithPath:(NSURL *)url parent:(KRWBFileSystemItem *)parentItem {
+    self = [super init];
+    if (self) {
+        fullPath = url;
+        parent = parentItem;
+    }
+    return self;
+}
+
+
++ (KRWBFileSystemItem *)rootItem {
+    if (rootItem == nil) {
+        rootItem = [[KRWBFileSystemItem alloc] initWithPath:[NSURL URLWithString:@"file://localhost/"] parent:nil];
+    }
+    return rootItem;
+}
+
+
+// Creates, caches, and returns the array of children
+// Loads children incrementally
+- (NSArray *)children {
+    
+    if (children == nil) {
+        NSFileManager *fileManager = [NSFileManager defaultManager];
+        NSError *error;
+        
+        BOOL valid = [fullPath checkResourceIsReachableAndReturnError:NULL];
+        
+        
+        NSNumber *isDirectory = nil;
+        if (! [fullPath getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:&error]) {
+            // handle error
+        }
+        
+        BOOL isDir = [isDirectory boolValue];
+        if (valid && isDir) {
+            NSArray *keys = [NSArray arrayWithObject:NSURLIsDirectoryKey];
+            
+            NSArray *child_urls = [fileManager contentsOfDirectoryAtURL:fullPath includingPropertiesForKeys:keys options: NSDirectoryEnumerationSkipsHiddenFiles error:&error];
+            /*
+            NSDirectoryEnumerator *enumerator = [fileManager
+                 enumeratorAtURL:fullPath
+                 includingPropertiesForKeys:keys
+                 options:0
+                 errorHandler:^(NSURL *url, NSError *error) {
+                     // Handle the error.
+                     // Return YES if the enumeration should continue after the error.
+                     return YES;
+            }];
+             */
+            
+            children = [[NSMutableArray alloc] init];
+            
+            for (NSURL *url in child_urls) {
+                KRWBFileSystemItem *newChild = [[KRWBFileSystemItem alloc]
+                                                initWithPath:url parent:self];     
+                [children addObject:newChild];
+            }
+        } else {
+            children = leafNode;
+        }
+    }
+    return children;
+}
+
+
+- (NSString *)relativePath {
+    return [[fullPath lastPathComponent] copy];
+}
+
+
+- (KRWBFileSystemItem *)childAtIndex:(NSUInteger)n {
+    return [[self children] objectAtIndex:n];
+}
+
+
+- (NSInteger)numberOfChildren {
+    NSArray *tmp = [self children];
+    return (tmp == leafNode) ? (-1) : [tmp count];
+}
+
+
+- (void)dealloc {
+
+}
+
+@end