Move GRXMappingWriter to root directory

1 files changed, 46 insertions, 0 deletions

diff --git a/src/objective-c/RxLibrary/GRXMappingWriter.m b/src/objective-c/RxLibrary/GRXMappingWriter.m
new file mode 100644
index 0000000000..108ed868a2
--- /dev/null
+++ b/src/objective-c/RxLibrary/GRXMappingWriter.m
@@ -0,0 +1,46 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * 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 "GRXMappingWriter.h"
+
+@interface GRXForwardingWriter ()<GRXWriteable>
+@end
+
+@implementation GRXMappingWriter {
+  id (^_map)(id value);
+}
+
+- (instancetype)initWithWriter:(GRXWriter *)writer {
+  return [self initWithWriter:writer map:nil];
+}
+
+// Designated initializer
+- (instancetype)initWithWriter:(GRXWriter *)writer map:(id (^)(id value))map {
+  if ((self = [super initWithWriter:writer])) {
+    _map = map ?: ^id(id value) {
+      return value;
+    };
+  }
+  return self;
+}
+
+// Override
+- (void)writeValue:(id)value {
+  [super writeValue:_map(value)];
+}
+@end