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fix: incorrect check for Windows OS in FileDataStoreFactory #927

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merged 3 commits into from
Mar 25, 2020
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fix: incorrect check for Windows OS in FileDataStoreFactory #927

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7a3613a
fix: incorrect check for Windows OS in FileDataStoreFactory
diesieben07 Dec 28, 2019
c97c34e
fix: properly get file owner on windows in FileDataStoreFactory
diesieben07 Dec 28, 2019
6bc4da2
refactor: use toLowerCase instead of regionMatches in FileDataStoreFa…
diesieben07 Dec 29, 2019
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2 changes: 1 addition & 1 deletion google-http-client/src/main/java/com/google/api/client/util/store/FileDataStoreFactory.java
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Expand Up @@ -53,7 +53,7 @@ public class FileDataStoreFactory extends AbstractDataStoreFactory {
private static final Logger LOGGER = Logger.getLogger(FileDataStoreFactory.class.getName());

private static final boolean IS_WINDOWS = StandardSystemProperty.OS_NAME.value()
.startsWith("WINDOWS");
.regionMatches(true, 0, "WINDOWS", 0, "WINDOWS".length());
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This appears to depend on the default character set.

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We are just dealing with strings here, they are always in utf-16. Do you mean default locale? If so, I don't think so. The Javadoc for regionMatches does not mention anything about locale and the source code also does not do anything locale dependent.

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As for testing...
The PR that introduced this check mentions waiting for a windows test machine, which was then apparently addressed in a different PR. I am not familiar with the automated testing setup for this library, but through searching the web I have not been able to find an instance where os.name ever contained "WINDOWS" (all uppercase). So I am not sure how the initial PR even passed testing on any kind of Windows system.

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See: #557

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Case insensitive comparison is fundamentally locale dependent. E.g. I is not the upper case of i in Turkish locales. UTF-16 is a character set, not a locale.

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@diesieben07 diesieben07 Dec 28, 2019 •
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UTF-16 is a character set, not a locale.

Yes. Which is why your original message saying "default character set" confused me.

Case insensitive comparison is fundamentally locale dependent. E.g. I is not the upper case of i in Turkish locales.

I know. regionMatches does not take this into account. regionMatches uses Character.toLowerCase, which specifically mentions:

{@code String} case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the {@code Character} case mapping methods cannot.

If you prefer i'll change it to a toLowerCase(Locale.ENGLISH) version though.

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Yes, that would be good. I still need to think about how to test this.


/** Directory to store data. */
private final File dataDirectory;
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