Initial checkin of gRPC to third_party/

third_party/grpc/src/objective-c/RxLibrary/NSEnumerator+GRXUtil.m

-/* Copyright (c) 2010, Google Inc.
+/*
+ *
+ * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * ---
- * Author: Chris Ruemmler
  */
 
-#ifndef BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_
-#define BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_
+#import "NSEnumerator+GRXUtil.h"
 
-#include "base/basictypes.h"
+#import "private/GRXNSBlockEnumerator.h"
+#import "private/GRXNSFastEnumerator.h"
+#import "private/GRXNSScalarEnumerator.h"
 
-namespace base {
+@implementation NSEnumerator (GRXUtil)
 
-// We can do contention-profiling of SpinLocks, but the code is in
-// mutex.cc, which is not always linked in with spinlock.  Hence we
-// provide a weak definition, which are used if mutex.cc isn't linked in.
++ (NSEnumerator *)grx_enumeratorWithContainer:(id<NSFastEnumeration>)container {
+  // TODO(jcanizales): Consider checking if container responds to objectEnumerator and return that?
+  return [[GRXNSFastEnumerator alloc] initWithContainer:container];
+}
 
-// Submit the number of cycles the spinlock spent contending.
-ATTRIBUTE_WEAK extern void SubmitSpinLockProfileData(const void *, int64);
-extern void SubmitSpinLockProfileData(const void *contendedlock,
-                                      int64 wait_cycles) {}
++ (NSEnumerator *)grx_enumeratorWithSingleValue:(id)value {
+  return [[GRXNSScalarEnumerator alloc] initWithValue:value];
 }
-#endif  // BASE_AUXILIARY_SYNCHRONIZATION_PROFILING_H_
+
++ (NSEnumerator *)grx_enumeratorWithValueSupplier:(id (^)())block {
+  return [[GRXNSBlockEnumerator alloc] initWithValueSupplier:block];
+}
+@end