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Bulk 'Files.readAttributes()' call can be used

Reports multiple sequential java.io.File attribute checks, such as:

  • isDirectory()

  • isFile()

  • lastModified()

  • length()

Such calls can be replaced with a bulk Files.readAttributes() call. This is usually more performant than multiple separate attribute checks.

Example:

boolean isNewFile(File file, long lastModified) throws IOException { return file.isFile() && file.lastModified() > lastModified; }

After the quick-fix is applied:

boolean isNewFile(File file, long lastModified) throws IOException { var fileAttributes = Files.readAttributes(file.toPath(), BasicFileAttributes.class); return fileAttributes.isRegularFile() && fileAttributes.lastModifiedTime().toMillis() > lastModified; }

This inspection does not show a warning if IOException is not handled in the current context, but the quick-fix is still available.

Note that the replacements are usually not completely equivalent and should be applied with care. In particular, the behavior could differ if the file does not exist at all.

This inspection only reports if the language level of the project or module is 7 or higher.

New in 2022.1

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024