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Add file modes for opening a file write only
Added two new file modes WRITE_ONLY and WRITE_ONLY_APPEND. The current file modes WRITE and WRITE_APPEND are kept as the read/write mode with no change. Kept the same overall handling of create/truncate/append semantics for the new file modes. R=ager@google.com, ahe@google.com BUG= Review URL: https://codereview.chromium.org//1193653002.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| // 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. | ||
| // | ||
| // Dart test program for testing file I/O. | ||
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| import 'dart:async'; | ||
| import 'dart:io'; | ||
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| import "package:async_helper/async_helper.dart"; | ||
| import "package:expect/expect.dart"; | ||
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| Future withTempDir(String prefix, void test(Directory dir)) async { | ||
| var tempDir = Directory.systemTemp.createTempSync(prefix); | ||
| try { | ||
| await test(tempDir); | ||
| } finally { | ||
| tempDir.deleteSync(recursive: true); | ||
| } | ||
| } | ||
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| void withTempDirSync(String prefix, void test(Directory dir)) async { | ||
| var tempDir = Directory.systemTemp.createTempSync(prefix); | ||
| try { | ||
| test(tempDir); | ||
| } finally { | ||
| tempDir.deleteSync(recursive: true); | ||
| } | ||
| } | ||
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| Futire expectThrowsAsync(Future future, String message) { | ||
| return future.then((r) => Expect.fail(message)) | ||
| .catchError((e) {}); | ||
| } | ||
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| Future write(Directory dir) async { | ||
| var f = new File('x'); | ||
| var raf = await f.open(mode: WRITE_ONLY); | ||
| await raf.writeString('Hello'); | ||
| await raf.setPosition(0); | ||
| await raf.writeString('Hello'); | ||
| await raf.setPosition(0); | ||
| await expectThrowsAsync( | ||
| raf.readByte(), 'Read from write only file succeeded'); | ||
| await raf.close(); | ||
| raf = await f.open(mode: WRITE_ONLY_APPEND); | ||
| await raf.writeString('Hello'); | ||
| await expectThrowsAsync( | ||
| raf.readByte(), 'Read from write only file succeeded'); | ||
| await raf.setPosition(0); | ||
| await raf.writeString('Hello'); | ||
| await raf.close(); | ||
| Expect.equals(f.lengthSync(), 10); | ||
| } | ||
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| Future writeSync(Directory dir) { | ||
| var f = new File('x'); | ||
| var raf = f.openSync(mode: WRITE_ONLY); | ||
| raf.writeStringSync('Hello'); | ||
| raf.setPositionSync(0); | ||
| raf.writeStringSync('Hello'); | ||
| raf.setPositionSync(0); | ||
| Expect.throws(() => raf.readByteSync()); | ||
| } | ||
|
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| Future openWrite(Directory dir) async { | ||
| var f = new File('x'); | ||
| var sink = f.openWrite(mode: WRITE_ONLY); | ||
| sink.write('Hello'); | ||
| await sink.close(); | ||
| sink = await f.openWrite(mode: WRITE_ONLY_APPEND); | ||
| sink.write('Hello'); | ||
| await sink.close(); | ||
| Expect.equals(f.lengthSync(), 10); | ||
| } | ||
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| main() async { | ||
| asyncStart(); | ||
| await withTempDir('file_write_only_test', write); | ||
| withTempDirSync('file_write_only_test', writeSync); | ||
| await withTempDir('file_write_only_test', openWrite); | ||
| asyncEnd(); | ||
| } |