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Side by Side Diff: sdk/lib/convert/converter.dart

Issue 2529393002: Make core libraries use generic method syntax. (Closed)
Patch Set: Update status files. Created 3 years, 11 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 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. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 part of dart.convert; 5 part of dart.convert;
6 6
7 /** 7 /**
8 * A [Converter] converts data from one representation into another. 8 * A [Converter] converts data from one representation into another.
9 * 9 *
10 * It is recommended that implementations of `Converter` extend this class, 10 * It is recommended that implementations of `Converter` extend this class,
11 * to inherit any further methods that may be added to the class. 11 * to inherit any further methods that may be added to the class.
12 */ 12 */
13 abstract class Converter<S, T> implements StreamTransformer/*<S, T>*/ { 13 abstract class Converter<S, T> implements StreamTransformer<S, T> {
14 const Converter(); 14 const Converter();
15 15
16 /** 16 /**
17 * Converts [input] and returns the result of the conversion. 17 * Converts [input] and returns the result of the conversion.
18 */ 18 */
19 T convert(S input); 19 T convert(S input);
20 20
21 /** 21 /**
22 * Fuses `this` with [other]. 22 * Fuses `this` with [other].
23 * 23 *
24 * Encoding with the resulting converter is equivalent to converting with 24 * Encoding with the resulting converter is equivalent to converting with
25 * `this` before converting with `other`. 25 * `this` before converting with `other`.
26 */ 26 */
27 Converter<S, dynamic/*=TT*/> fuse/*<TT>*/( 27 Converter<S, TT> fuse<TT>(Converter<T, TT> other) {
28 Converter<T, dynamic/*=TT*/> other) { 28 return new _FusedConverter<S, T, TT>(this, other);
29 return new _FusedConverter<S, T, dynamic/*=TT*/>(this, other);
30 } 29 }
31 30
32 /** 31 /**
33 * Starts a chunked conversion. 32 * Starts a chunked conversion.
34 * 33 *
35 * The returned sink serves as input for the long-running conversion. The 34 * The returned sink serves as input for the long-running conversion. The
36 * given [sink] serves as output. 35 * given [sink] serves as output.
37 */ 36 */
38 Sink/*<S>*/ startChunkedConversion(Sink/*<T>*/ sink) { 37 Sink/*<S>*/ startChunkedConversion(Sink/*<T>*/ sink) {
39 throw new UnsupportedError( 38 throw new UnsupportedError(
40 "This converter does not support chunked conversions: $this"); 39 "This converter does not support chunked conversions: $this");
41 } 40 }
42 41
43 Stream/*<T>*/ bind(Stream/*<S>*/ stream) { 42 Stream<T> bind(Stream<S> stream) {
44 return new Stream/*<T>*/.eventTransformed( 43 return new Stream<T>.eventTransformed(
45 stream, 44 stream,
46 (EventSink sink) => new _ConverterStreamEventSink(this, sink)); 45 (EventSink sink) => new _ConverterStreamEventSink(this, sink));
47 } 46 }
48 } 47 }
49 48
50 /** 49 /**
51 * Fuses two converters. 50 * Fuses two converters.
52 * 51 *
53 * For a non-chunked conversion converts the input in sequence. 52 * For a non-chunked conversion converts the input in sequence.
54 */ 53 */
55 class _FusedConverter<S, M, T> extends Converter<S, T> 54 class _FusedConverter<S, M, T> extends Converter<S, T>
56 implements ChunkedConverter<S, T, S, T> { 55 implements ChunkedConverter<S, T, S, T> {
57 final Converter<S, M> _first; 56 final Converter<S, M> _first;
58 final Converter<M, T> _second; 57 final Converter<M, T> _second;
59 58
60 _FusedConverter(this._first, this._second); 59 _FusedConverter(this._first, this._second);
61 60
62 T convert(S input) => _second.convert(_first.convert(input)); 61 T convert(S input) => _second.convert(_first.convert(input));
63 62
64 Sink/*<S>*/ startChunkedConversion(Sink/*<T>*/ sink) { 63 Sink/*<S>*/ startChunkedConversion(Sink/*<T>*/ sink) {
65 return _first.startChunkedConversion(_second.startChunkedConversion(sink)); 64 return _first.startChunkedConversion(_second.startChunkedConversion(sink));
66 } 65 }
67 } 66 }
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