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// Copyright (c) 2015, 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.
/// Simple delegating wrapper around a [Sink].
/// Subclasses can override individual methods, or use this to expose only the
/// [Sink] methods of a subclass.
class DelegatingSink<T> implements Sink<T> {
final Sink _sink;
/// Create a delegating sink forwarding calls to [sink].
DelegatingSink(Sink<T> sink) : _sink = sink;
/// Creates a wrapper that coerces the type of [sink].
/// Unlike [new DelegatingSink], this only requires its argument to be an
/// instance of `Sink`, not `Sink<T>`. This means that calls to [add] may
/// throw a [CastError] if the argument type doesn't match the reified type of
/// [sink].
static Sink<T> typed<T>(Sink sink) =>
sink is Sink<T> ? sink : DelegatingSink._(sink);
void add(T data) {
void close() {