yybmion commented on issue #3775:
URL:
https://github.com/apache/logging-log4j2/issues/3775#issuecomment-3088337699
Thanks for guidance @ppkarwasz!
Based on the discussion above, I'm proposing to add this static method to
ConfigurationFactory
```java
/**
* Returns configuration file extensions currently supported at runtime.
* This can be used by external frameworks like Spring Boot for
configuration file discovery logic.
*
* <p>This method checks all active ConfigurationFactory instances and
returns only the file formats
* that are actually available. For example, if the Jackson library is
missing, JSON formats
* will be excluded from the results.</p>
*
* @return array of supported file extensions (e.g., ["xml", "json",
"properties"])
* @since 2.25.0
*/
public static String[] getSupportedConfigurationExtensions() {
final List<String> extensions = new ArrayList<>();
for (final ConfigurationFactory factory : getFactories()) {
if (factory.isActive()) {
final String[] types = factory.getSupportedTypes();
if (types != null) {
for (final String type : types) {
if (!"*".equals(type) && !extensions.contains(type)) {
extensions.add(type);
}
}
}
}
}
return extensions.toArray(new String[0]);
}
```
Implementation approach:
- Filters results from getFactories() to include only active factories
- Leverages existing getSupportedTypes() and isActive() methods
- Excludes wildcard types ("*") that aren't meaningful as file extensions
- Avoids duplicates in the result array
Does this implementation approach look correct to you?
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