Introduce class Sink<T>.

sdk/lib/convert/byte_conversion.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.convert;
 
 /**
  * The [ByteConversionSink] provides an interface for converters to
  * efficiently transmit byte data.
  *
  * Instead of limiting the interface to one non-chunked list of bytes it
  * accepts its input in chunks (themselves being lists of bytes).
  *
  * This abstract class will likely get more methods over time. Implementers are
  * urged to extend or mix in [ByteConversionSinkBase] to ensure that their
  * class covers the newly added methods.
  */
 abstract class ByteConversionSink extends ChunkedConversionSink<List<int>> {
   ByteConversionSink();
   factory ByteConversionSink.withCallback(void callback(List<int> accumulated))
       = _ByteCallbackSink;
-  factory ByteConversionSink.from(ChunkedConversionSink<List<int>> sink)
+  factory ByteConversionSink.from(Sink<List<int>> sink)
       = _ByteAdapterSink;
 
   /**
    * Adds the next [chunk] to `this`.
    *
    * Adds the bytes defined by [start] and [end]-exclusive to `this`.
    *
    * If [isLast] is `true` closes `this`.
    *
    * Contrary to `add` the given [chunk] must not be held onto. Once the method
@@ skipping 14 matching lines @@
   void add(List<int> chunk);
   void close();
 
   void addSlice(List<int> chunk, int start, int end, bool isLast) {
     add(chunk.sublist(start, end));
     if (isLast) close();
   }
 }
 
 /**
- * This class adapts a simple [ChunkedConversionSink] to a [ByteConversionSink].
+ * This class adapts a simple [Sink] to a [ByteConversionSink].
  *
  * All additional methods of the [ByteConversionSink] (compared to the
  * ChunkedConversionSink) are redirected to the `add` method.
  */
 class _ByteAdapterSink extends ByteConversionSinkBase {
-  final ChunkedConversionSink<List<int>> _sink;
+  final Sink<List<int>> _sink;
 
   _ByteAdapterSink(this._sink);
 
   void add(List<int> chunk) => _sink.add(chunk);
   void close() => _sink.close();
 }
 
 /**
  * This class accumulates all chunks into one list of bytes
  * and invokes a callback when the sink is closed.
@@ skipping 35 matching lines @@
     v |= v >> 8;
     v |= v >> 16;
     v++;
     return v;
   }
 
   void close() {
     _callback(_buffer.sublist(0, _bufferIndex));
   }
 }