From 6fdb9dfef2c10696fc38a3ad860e014782b7d698 Mon Sep 17 00:00:00 2001
From: "thomasvl@gmail.com"
 <thomasvl@gmail.com@7dc7ac4e-7543-0410-b95c-c1676fc8e2a3>
Date: Mon, 17 Nov 2008 21:30:25 +0000
Subject: - Added GTMLightweightProxy - Added installer for the spotlight
 importers.

---
 Foundation/GTMLightweightProxy.m | 112 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 Foundation/GTMLightweightProxy.m

(limited to 'Foundation/GTMLightweightProxy.m')

diff --git a/Foundation/GTMLightweightProxy.m b/Foundation/GTMLightweightProxy.m
new file mode 100644
index 0000000..ad7e0a1
--- /dev/null
+++ b/Foundation/GTMLightweightProxy.m
@@ -0,0 +1,112 @@
+//
+//  GTMLightweightProxy.m
+//
+//  Copyright 2006-2008 Google Inc.
+//
+//  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 "GTMLightweightProxy.h"
+
+
+@implementation GTMLightweightProxy
+
+- (id)initWithRepresentedObject:(id)object {
+  // it's weak, we don't retain
+  representedObject_ = object;
+  return self;
+}
+
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
+// -[NSProxy finalize] is only in 10.5 or later
+- (void)finalize {
+  representedObject_ = nil;
+  [super finalize];
+}
+#endif
+
+- (void)dealloc {
+  // it's weak, we don't release
+  representedObject_ = nil;
+  [super dealloc];
+}
+
+- (id)representedObject {
+  // Use a local variable to avoid a bogus compiler warning.
+  id repObject = nil;
+  @synchronized(self) {
+    // Even though we don't retain this object, we hang it on the lifetime
+    // of the calling threads pool so it's lifetime is safe for at least that
+    // long.
+    repObject = [[representedObject_ retain] autorelease];
+  }
+  return repObject;
+}
+
+- (void)setRepresentedObject:(id)object {
+  @synchronized(self) {
+    representedObject_ = object;
+  }
+}
+
+// Passes any unhandled method to the represented object if it responds to that
+// method.
+- (void)forwardInvocation:(NSInvocation*)invocation {
+  id target = [self representedObject];
+  // Silently discard all messages when there's no represented object
+  if (!target)
+    return;
+
+  SEL aSelector = [invocation selector];
+  if ([target respondsToSelector:aSelector])
+    [invocation invokeWithTarget:target];
+}
+
+// Gets the represented object's method signature for |selector|; necessary for
+// forwardInvocation.
+- (NSMethodSignature*)methodSignatureForSelector:(SEL)selector {
+  id target = [self representedObject];
+  if (target) {
+    return [target methodSignatureForSelector:selector];
+  } else {
+    // Apple's underlying forwarding code crashes if we return nil here.
+    // Since we are not going to use the invocation being constructed
+    // if there's no representedObject, a random valid NSMethodSignature is fine.
+    return [NSObject methodSignatureForSelector:@selector(alloc)];
+  }
+}
+
+// Prevents exceptions from unknown selectors if there is no represented
+// object, and makes the exception come from the right place if there is one.
+- (void)doesNotRecognizeSelector:(SEL)selector {
+  id target = [self representedObject];
+  if (target)
+    [target doesNotRecognizeSelector:selector];
+}
+
+// Checks the represented object's selectors to allow clients of the proxy to
+// do respondsToSelector: tests.
+- (BOOL)respondsToSelector:(SEL)selector {
+  if ([super respondsToSelector:selector] ||
+      selector == @selector(initWithRepresentedObject:) ||
+      selector == @selector(representedObject) ||
+      selector == @selector(setRepresentedObject:))
+  {
+    return YES;
+  }
+
+  id target = [self representedObject];
+  return target && [target respondsToSelector:selector];
+}
+
+@end
-- 
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