[Cocoa] Replace deprecated LSGetApplicationForInfo in Program.findProgram

[HeikoKlare]

Problem

Program.findProgram(String) on macOS used two deprecated native APIs:

• LSGetApplicationForInfo — deprecated since macOS 10.10, used to find the default application for a file extension by querying Launch Services
• CFURLCreateFromFSRef — deprecated since macOS 10.9, used to convert the returned FSRef to a CFURL

Both of these also required the deprecated constants kLSUnknownType, kLSUnknownCreator, and kLSRolesAll.

Solution

The two deprecated calls are replaced by modern NSWorkspace APIs:

On macOS 12.0+ (primary path):

1. Look up a UTType for the file extension using [UTType typeWithFilenameExtension:] (UniformTypeIdentifiers framework)
2. Find the default application using [NSWorkspace URLForApplicationToOpenContentType:]

This approach directly queries the Launch Services database by content type and reliably handles all file types, including third-party ones such as .xlsx (Microsoft Excel), which the intermediate URLForApplicationToOpenURL: approach failed to resolve for non-existent dummy files on modern macOS.

Fallback for macOS 10.6–11.x:

• [NSWorkspace URLForApplicationToOpenURL:] with a dummy file URL carrying the target extension

Changes

• NSWorkspace.java: Added two new methods following Java camelCase conventions:

  • urlForApplicationToOpenURL(NSURL) — wraps the deprecated-but-still-functional macOS 10.6+ API for older systems
  • urlForApplicationToOpenContentType(long) — wraps the modern macOS 12.0+ API

• Selector.java / OS.java: Added the required Objective-C selectors URLForApplicationToOpenURL:, URLForApplicationToOpenContentType:, and typeWithFilenameExtension:

• OS.java: Removed native method declarations for LSGetApplicationForInfo and CFURLCreateFromFSRef, and their associated constants kLSUnknownType, kLSUnknownCreator, kLSRolesAll

• Program.java: Replaced the deprecated two-step lookup with a call to the new findAppURLForExtension() helper that applies the version-guarded strategy above

• os.c / os_stats.h: Regenerated to reflect the removed native methods

• Test_org_eclipse_swt_program_Program.java: Added test_findProgramForTxt() asserting that findProgram(".txt") returns a non-null program with a non-empty name on Windows and macOS. The test is skipped on Linux because applications for MIME types may not be registered in Linux test environments.

Related

Contributes to #3186

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🤖 Created with Claude Code

[github-actions]

Test Results

  170 files  +26    170 suites  +26   28m 59s ⏱️ +37s
4 680 tests + 1  4 659 ✅ + 1   21 💤 ±0  0 ❌ ±0 
6 598 runs  +58  6 440 ✅ +55  158 💤 +3  0 ❌ ±0 

Results for commit 378b95a. ± Comparison against base commit 98062b7.

♻️ This comment has been updated with latest results.

[HannesWell]

That's nice, thanks for that.
And it even needs less native code 🎉

One nitpick: If the years in the copyright headers are adjusted in some files, it would be nice to increment them in other files too.

[HeikoKlare]

One nitpick: If the years in the copyright headers are adjusted in some files, it would be nice to increment them in other files too.

The copyright years were actually not updated explicitly but auto-updated by SWT tooling.
But we can of course also update the years in the other files. I have updated the PR accordingly.

[HannesWell]

Suggested change

	static NSURL findAppURLForExtension(NSWorkspace workspace, NSString ext) {
	private static NSURL findAppURLForExtension(NSWorkspace workspace, NSString ext) {

[HannesWell]

Wouldn't it be possible to just call NSWorkspace workspace = NSWorkspace.sharedWorkspace(); within the method instead of passing the returned object in as parameter?