Initial checkin of gRPC to third_party/

third_party/grpc/src/objective-c/RxLibrary/GRXWriteable.m

 /*
- * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
- * Copyright (C) 2013 Samsung Electronics. All rights reserved.
+ *
+ * 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.
+ *
  */
 
-#ifndef DOMWindowBase64_h
-#define DOMWindowBase64_h
+#import "GRXWriteable.h"
 
-#include "wtf/text/WTFString.h"
+@implementation GRXWriteable {
+  GRXValueHandler _valueHandler;
+  GRXCompletionHandler _completionHandler;
+}
 
-namespace blink {
++ (instancetype)writeableWithSingleHandler:(GRXSingleHandler)handler {
+  if (!handler) {
+    return [[self alloc] init];
+  }
+  return [[self alloc] initWithValueHandler:^(id value) {
+    handler(value, nil);
+  } completionHandler:^(NSError *errorOrNil) {
+    if (errorOrNil) {
+      handler(nil, errorOrNil);
+    }
+  }];
+}
 
-class ExceptionState;
++ (instancetype)writeableWithEventHandler:(GRXEventHandler)handler {
+  if (!handler) {
+    return [[self alloc] init];
+  }
+  return [[self alloc] initWithValueHandler:^(id value) {
+    handler(NO, value, nil);
+  } completionHandler:^(NSError *errorOrNil) {
+    handler(YES, nil, errorOrNil);
+  }];
+}
 
-class DOMWindowBase64 {
-public:
-    String btoa(const String& stringToEncode, ExceptionState&);
-    String atob(const String& encodedString, ExceptionState&);
-};
+- (instancetype)init {
+  return [self initWithValueHandler:nil completionHandler:nil];
+}
 
-} // namespace blink
+// Designated initializer
+- (instancetype)initWithValueHandler:(GRXValueHandler)valueHandler
+                   completionHandler:(GRXCompletionHandler)completionHandler {
+  if ((self = [super init])) {
+    _valueHandler = valueHandler;
+    _completionHandler = completionHandler;
+  }
+  return self;
+}
 
-#endif // DOMWindowBase64_h
+- (void)writeValue:(id)value {
+  if (_valueHandler) {
+    _valueHandler(value);
+  }
+}
+
+- (void)writesFinishedWithError:(NSError *)errorOrNil {
+  if (_completionHandler) {
+    _completionHandler(errorOrNil);
+  }
+}
+@end