Adding GUID generator util class.

JFGuidGenerator.h

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+//
+// JFGuidGenerator.h
+// JFCommon
+//
+// Created by Jason Fuerstenberg on 10/12/28.
+// Copyright 2010 Jason Fuerstenberg. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#import <Foundation/Foundation.h>
+
+
+@interface JFGuidGenerator : NSObject
+
++ (NSString *) generateGuid;
+
+@end

JFGuidGenerator.m

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+//
+// JFGuidGenerator.m
+// JFCommon
+//
+// Created by Jason Fuerstenberg on 10/12/28.
+// Copyright 2010 Jason Fuerstenberg. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#import "JFGuidGenerator.h"
+
+
+@implementation JFGuidGenerator
+
+/*
+ * Generates and returns a GUID.
+ *
+ * NOTE: Based on logic from:  http://cocoabugs.blogspot.com/2010/12/gereateing-unique-uuiduinique-id-in.html
+ */
++ (NSString *) generateGuid {
+
+    CFUUIDRef uuid = CFUUIDCreate(NULL);
+    CFStringRef uuidStr = CFUUIDCreateString(NULL, uuid);
+    CFRelease(uuid);
+
+#if __has_feature(objc_arc)
+	// Using ARC so just return...
+	return (__bridge NSString *) uuidStr;
+#else
+	// Autorelease the instance then return...
+	[(NSString *) uuidStr autorelease];
+	return (NSString *) uuidStr;
+#endif
+}
+
+@end