Add chunked conversion to converters.

tests/lib/convert/chunked_conversion1_test.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.
+
+import 'dart:convert';
+
+import 'package:expect/expect.dart';
+
+class MyChunkedIntInterface extends ChunkedConversionInterface {
+  const MyChunkedIntInterface();
+
+  ChunkedConversionSink adapt(ChunkedConversionSink sink) {
+    if (sink.interface == MyChunkedIntSink.INTERFACE) return sink;
+    Expect.fail("should only be called with correct sink");
+  }
+}
+
+abstract class MyChunkedIntSink extends ChunkedConversionSink<List<int>, int> {
+  static const INTERFACE = const MyChunkedIntInterface();
+
+  addNonChunked(List<int> list);
+  add(int i);
+  close();
+
+  get interface => INTERFACE;
+}
+
+class MyChunkedCallbackIntSink extends MyChunkedIntSink {
+  final Function _callback;
+  final _accumulator = <int>[];
+
+  MyChunkedCallbackIntSink(void callback(List<int> value, bool wasChunked))
+      : this._callback = callback;
+
+  addNonChunked(List<int> list) => _callback(list, false);
+  add(int i) => _accumulator.add(i);
+  close() => _callback(_accumulator, true);
+}
+
+class MyChunkedBoolInterface extends ChunkedConversionInterface {
+  const MyChunkedBoolInterface();
+
+  ChunkedConversionSink adapt(ChunkedConversionSink sink) {
+    if (sink.interface == MyChunkedBoolSink.INTERFACE) return sink;
+    Expect.fail("should only be called with correct sink");
+  }
+}
+
+class MyChunkedBoolSink extends ChunkedConversionSink<List<bool>, bool> {
+  static const INTERFACE = const MyChunkedBoolInterface();
+
+  addNonChunked(List<bool> list);
+  add(bool b);
+  close();
+
+  get interface => INTERFACE;
+}
+
+
+class MyChunkedCallbackBoolSink extends MyChunkedBoolSink {
+  static const INTERFACE = const MyChunkedBoolInterface();
+  final Function _callback;
+  final _accumulator = <bool>[];
+
+  MyChunkedCallbackBoolSink(void callback(List<bool> value, bool wasChunked))
+      : this._callback = callback;
+
+  addNonChunked(List<bool> list) => _callback(list, false);
+  add(bool b) => _accumulator.add(b);
+  close() => _callback(_accumulator, true);
+
+  get interface => INTERFACE;
+}
+
+
+class IntBoolConverter1 extends Converter<List<int>, List<bool>> {
+  List<bool> convert(List<int> input) => input.map((x) => x > 0).toList();
+
+  startChunkedConversion(sink) {
+    return new IntBoolConverter1Sink(outputInterface.adapt(sink));
+  }
+
+  get outputInterface => MyChunkedBoolSink.INTERFACE;
+  get inputInterface => MyChunkedIntSink.INTERFACE;
+}
+
+class BoolIntConverter1 extends Converter<List<bool>, List<int>> {
+  List<int> convert(List<bool> input) => input.map((x) => x ? 1 : 0).toList();
+
+  startChunkedConversion(sink) {
+    return new BoolIntConverter1Sink(outputInterface.adapt(sink));
+  }
+
+  get outputInterface => MyChunkedIntSink.INTERFACE;
+  get inputInterface => MyChunkedBoolSink.INTERFACE;
+}
+
+int chunkedConversionCounter = 0;
+
+class IntBoolConverter1Sink extends MyChunkedIntSink {
+  var outSink;
+  IntBoolConverter1Sink(this.outSink);
+
+  add(int i) {
+    chunkedConversionCounter++;
+    outSink.add(i > 0);
+  }
+  close() => outSink.close();
+  addNonChunked(List<int> list) => list.forEach((x) => outSink.add(x > 0));
+}
+
+class BoolIntConverter1Sink extends MyChunkedBoolSink {
+  var outSink;
+  BoolIntConverter1Sink(this.outSink);
+
+  add(bool b) {
+    chunkedConversionCounter++;
+    outSink.add(b ? 1 : 0);
+  }
+  close() => outSink.close();
+  addNonChunked(List<bool> list) => list.forEach((x) => outSink.add(x ? 1 : 0));
+}
+
+main() {
+  var converter1, converter2, intSink, intSink2, hasExecuted, boolSink, fused;
+
+  // Test int->bool converter individually.
+  converter1 = new IntBoolConverter1();
+  Expect.listEquals([true, false, true], converter1.convert([2, -2, 2]));
+  hasExecuted = false;
+  boolSink = new MyChunkedCallbackBoolSink((value, wasChunked) {
+    hasExecuted = true;
+    Expect.listEquals([true, false, true], value);
+    Expect.isTrue(wasChunked);
+  });
+  intSink = converter1.startChunkedConversion(boolSink);
+  intSink.add(3);
+  intSink.add(-3);
+  intSink.add(3);
+  intSink.close();
+  Expect.isTrue(hasExecuted);
+  Expect.equals(3, chunkedConversionCounter);
+  chunkedConversionCounter = 0;
+  hasExecuted = false;
+
+  // Test bool->int converter individually.
+  converter2 = new BoolIntConverter1();
+  Expect.listEquals([1, 0, 1], converter2.convert([true, false, true]));
+  hasExecuted = false;
+  intSink = new MyChunkedCallbackIntSink((value, wasChunked) {
+    hasExecuted = true;
+    Expect.listEquals([1, 0, 1], value);
+    Expect.isTrue(wasChunked);
+  });
+  boolSink = converter2.startChunkedConversion(intSink);
+  boolSink.add(true);
+  boolSink.add(false);
+  boolSink.add(true);
+  boolSink.close();
+  Expect.isTrue(hasExecuted);
+  Expect.equals(3, chunkedConversionCounter);
+  chunkedConversionCounter = 0;
+  hasExecuted = false;
+
+  // Test fused converters.
+  fused = converter1.fuse(converter2);
+  Expect.listEquals([1, 0, 1], fused.convert([2, -2, 2]));
+  hasExecuted = false;
+  intSink2 = new MyChunkedCallbackIntSink((value, wasChunked) {
+    hasExecuted = true;
+    Expect.listEquals([1, 0, 1], value);
+    Expect.isTrue(wasChunked);
+  });
+  intSink = fused.startChunkedConversion(intSink2);
+  intSink.add(3);
+  intSink.add(-3);
+  intSink.add(3);
+  intSink.close();
+  Expect.isTrue(hasExecuted);
+  Expect.equals(6, chunkedConversionCounter);
+  chunkedConversionCounter = 0;
+  hasExecuted = false;
+}