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1 : // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file 2 : // for details. All rights reserved. Use of this source code is governed by a 3 : // BSD-style license that can be found in the LICENSE file. 4 : 5 : /// Simple delegating wrapper around a [Sink]. 6 : /// 7 : /// Subclasses can override individual methods, or use this to expose only the 8 : /// [Sink] methods of a subclass. 9 : class DelegatingSink<T> implements Sink<T> { 10 : final Sink _sink; 11 : 12 : /// Create a delegating sink forwarding calls to [sink]. 13 0 : DelegatingSink(Sink<T> sink) : _sink = sink; 14 : 15 0 : DelegatingSink._(this._sink); 16 : 17 : /// Creates a wrapper that coerces the type of [sink]. 18 : /// 19 : /// Unlike [new DelegatingSink], this only requires its argument to be an 20 : /// instance of `Sink`, not `Sink<T>`. This means that calls to [add] may 21 : /// throw a [TypeError] if the argument type doesn't match the reified type of 22 : /// [sink]. 23 0 : @Deprecated( 24 : 'Use StreamController<T>(sync: true)..stream.cast<S>().pipe(sink)') 25 : static Sink<T> typed<T>(Sink sink) => 26 0 : sink is Sink<T> ? sink : DelegatingSink._(sink); 27 : 28 0 : @override 29 : void add(T data) { 30 0 : _sink.add(data); 31 : } 32 : 33 0 : @override 34 : void close() { 35 0 : _sink.close(); 36 : } 37 : }