Update API for Objective-C RTCDataChannel.

webrtc/api/objc/RTCDataChannel.h

+/*
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RTCDataBuffer : NSObject
+
+/** NSData representation of the underlying buffer. */
+@property(nonatomic, readonly) NSData *data;
+
+/** Indicates whether |data| contains UTF-8 or binary data. */
+@property(nonatomic, readonly) BOOL isBinary;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+/**
+ * Initialize an RTCDataBuffer from NSData. |isBinary| indicates whether |data|
+ * contains UTF-8 or binary data.
+ */
+- (instancetype)initWithData:(NSData *)data isBinary:(BOOL)isBinary;
+
+@end
+
+
+@class RTCDataChannel;
+
+@protocol RTCDataChannelDelegate <NSObject>
+
+/** The data channel state changed. */
+- (void)dataChannelDidChangeState:(RTCDataChannel *)dataChannel;
+
+/** The data channel successfully received a data buffer. */
+- (void)dataChannel:(RTCDataChannel *)dataChannel
+    didReceiveMessageWithBuffer:(RTCDataBuffer *)buffer;
+
+@optional
+
+/** The data channel's |bufferedAmount| changed. */
+- (void)dataChannel:(RTCDataChannel *)dataChannel
+    didChangeBufferedAmount:(NSUInteger)amount;
+
+@end
+
+
+/** Represents the state of the data channel. */
+typedef NS_ENUM(NSInteger, RTCDataChannelState) {
+    RTCDataChannelStateConnecting,
+    RTCDataChannelStateOpen,
+    RTCDataChannelStateClosing,
+    RTCDataChannelStateClosed,
+};
+
+@interface RTCDataChannel : NSObject
+
+/**
+ * A label that can be used to distinguish this data channel from other data
+ * channel objects.
+ */
+@property(nonatomic, readonly) NSString *label;
+
+/** Returns whether this data channel is ordered or not. */
+@property(nonatomic, readonly) BOOL isOrdered;
+
+/**
+ * The length of the time window (in milliseconds) during which transmissions
+ * and retransmissions may occur in unreliable mode.
+ */
+@property(nonatomic, readonly) NSUInteger maxPacketLifeTime;
+
+/**
+ * The maximum number of retransmissions that are attempted in unreliable mode.
+ */
+@property(nonatomic, readonly) NSUInteger maxRetransmits;
+
+/**
+ * The name of the sub-protocol used with this data channel, if any. Otherwise
+ * this returns an empty string.
+ */
+@property(nonatomic, readonly) NSString *protocol;
+
+/**
+ * Returns whether this data channel was negotiated by the application or not.
+ */
+@property(nonatomic, readonly) BOOL isNegotiated;
+
+/** The identifier for this data channel. */
+@property(nonatomic, readonly) NSInteger id;
+
+/** The state of the data channel. */
+@property(nonatomic, readonly) RTCDataChannelState readyState;
+
+/**
+ * The number of bytes of application data that have been queued using
+ * |sendData:| but that have not yet been transmitted to the network.
+ */
+@property(nonatomic, readonly) NSUInteger bufferedAmount;
+
+/** The delegate for this data channel. */
+@property(nonatomic, weak) id<RTCDataChannelDelegate> delegate;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+/** Closes the data channel. */
+- (void)close;
+
+/** Attempt to send |data| on this data channel's underlying data transport. */
+- (BOOL)sendData:(RTCDataBuffer *)data;
+
+@end
+
+NS_ASSUME_NONNULL_END