1 files changed, 60 insertions, 0 deletions
diff --git a/src/objective-c/RxLibrary/GRXWriteable.h b/src/objective-c/RxLibrary/GRXWriteable.h
new file mode 100644
index 0000000000..5aa00ba40e
--- /dev/null
+++ b/src/objective-c/RxLibrary/GRXWriteable.h
@@ -0,0 +1,60 @@
+/*
+ *
+ * Copyright 2014, 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.
+ *
+ */
+
+#import <Foundation/Foundation.h>
+
+// A GRXWriteable is an object to which a sequence of values can be sent. The
+// sequence finishes with an optional error.
+@protocol GRXWriteable <NSObject>
+
+// Push the next value of the sequence to the receiving object.
+// TODO(jcanizales): Name it enumerator:(id<GRXEnumerator>) didProduceValue:(id)?
+- (void)didReceiveValue:(id)value;
+
+// Signal that the sequence is completed, or that an error ocurred. After this
+// message is sent to the instance, neither it nor didReceiveValue: may be
+// called again.
+// TODO(jcanizales): enumerator:(id<GRXEnumerator>) didFinishWithError:(NSError*)?
+- (void)didFinishWithError:(NSError *)errorOrNil;
+@end
+
+typedef void (^GRXValueHandler)(id value);
+typedef void (^GRXCompletionHandler)(NSError *errorOrNil);
+
+// Utility to create objects that conform to the GRXWriteable protocol, from
+// blocks that handle each of the two methods of the protocol.
+@interface GRXWriteable : NSObject<GRXWriteable>
+- (instancetype)initWithValueHandler:(GRXValueHandler)valueHandler
+                   completionHandler:(GRXCompletionHandler)completionHandler
+    NS_DESIGNATED_INITIALIZER;
+@end