The Gradle codebase has evolved over time and has a mixture of simple getter/setter methods, Provider API and things in between.  It can be hard to follow best practices because Gradle provided types are reused in unexpected ways and extended by third party plugins.

Given these constraints, we cannot always follow best practices.  This ADR proposes the way we should handle the use of Provider APIs in the gradle/gradle codebase.

## Decision

- In `Compliance` mode, objects cannot be deleted by anyone until retention period has expired for the given version id. If user has governance bypass permissions, an object's retention date can be extended in `Compliance` mode.
- Once object lock configuration is set to a bucket
  - New objects inherit the retention settings of the bucket object lock configuration automatically

-->

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type NoncurrentVersionTransition struct {
	NoncurrentDays TransitionDays `xml:"NoncurrentDays"`
	StorageClass   string         `xml:"StorageClass"`
	set            bool
}

// MarshalXML is extended to leave out
// <NoncurrentVersionTransition></NoncurrentVersionTransition> tags
func (n NoncurrentVersionTransition) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	if n.IsNull() {
		return nil
	}

- Use `OptionalEntity<T>` for nullable returns
- Plain classes (no extends/implements)

### Helper
- Stateless utility classes
- Access via `ComponentUtil.getXyzHelper()`
- Named with "Helper" suffix

### DBFlute Generated Code
```
opensearch/{index}/
├── bsentity/, bsbhv/    # Base classes (DO NOT EDIT)
├── exentity/, exbhv/    # Extended classes (customize here)

	DefaultReadHeaderTimeout = 30 * time.Second

	// DefaultMaxHeaderBytes - default maximum HTTP header size in bytes.
	DefaultMaxHeaderBytes = 1 * humanize.MiByte
)

// Server - extended http.Server supports multiple addresses to serve and enhanced connection handling.
type Server struct {
	http.Server
	Addrs         []string      // addresses on which the server listens for new connection.

            return SearchResult.create().build();
        }
    }

    /**
     * Extended searcher for testing inheritance.
     */
    static class ExtendedTestSearcher extends TestSearcher {
        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {

     * operation to return.
     */
    int FILE_NOTIFY_CHANGE_CREATION = 0x00000040;

    /**
     * Any change to the extended attributes (EA) of a file in the watched directory or subtree causes a change notification wait operation to return.
     */
    int FILE_NOTIFY_CHANGE_EA = 0x00000080;

    /**

    public static final int FILE_NOTIFY_CHANGE_LAST_ACCESS = 0x20;
    /**
     * Notify when creation time changes
     */
    public static final int FILE_NOTIFY_CHANGE_CREATION = 0x40;
    /**
     * Notify when extended attributes change
     */
    public static final int FILE_NOTIFY_CHANGE_EA = 0x80;
    /**
     * Notify when security descriptor changes
     */
    public static final int FILE_NOTIFY_CHANGE_SECURITY = 0x100;

    void testReadParameterWords(int expectedInt, byte[] bytes) {
        // The implementation reads via SMBUtil.readInt4 which returns an int
        // When assigned to a long field, it gets sign-extended
        int readLen = response.readParameterWordsWireFormat(bytes, 0);
        long expectedOffset = expectedInt; // Sign extension happens here for negative values