Use records for FileData implementations (elastic#122658) (elastic#122770)

This commit switches to using records in place of classes for FileData
impls. It moves them outside the interface so that they can be private.
This does not change the fact the interface is sealed, nor the factory
methods for creating them.

Author: rjernst

libs/entitlement/src/main/java/org/elasticsearch/entitlement/runtime/policy/entitlements/FilesEntitlement.java

@@ -41,83 +41,9 @@ public enum BaseDir {
 
     public sealed interface FileData {
 
-        final class AbsolutePathFileData implements FileData {
-            private final Path path;
-            private final Mode mode;
-
-            private AbsolutePathFileData(Path path, Mode mode) {
-                this.path = path;
-                this.mode = mode;
-            }
-
-            @Override
-            public Stream<Path> resolvePaths(PathLookup pathLookup) {
-                return Stream.of(path);
-            }
-
-            @Override
-            public Mode mode() {
-                return mode;
-            }
-
-            @Override
-            public boolean equals(Object obj) {
-                if (obj == this) return true;
-                if (obj == null || obj.getClass() != this.getClass()) return false;
-                var that = (AbsolutePathFileData) obj;
-                return Objects.equals(this.path, that.path) && Objects.equals(this.mode, that.mode);
-            }
-
-            @Override
-            public int hashCode() {
-                return Objects.hash(path, mode);
-            }
-        }
-
-        final class RelativePathFileData implements FileData {
-            private final Path relativePath;
-            private final BaseDir baseDir;
-            private final Mode mode;
-
-            private RelativePathFileData(Path relativePath, BaseDir baseDir, Mode mode) {
-                this.relativePath = relativePath;
-                this.baseDir = baseDir;
-                this.mode = mode;
-            }
-
-            @Override
-            public Stream<Path> resolvePaths(PathLookup pathLookup) {
-                Objects.requireNonNull(pathLookup);
-                switch (baseDir) {
-                    case CONFIG:
-                        return Stream.of(pathLookup.configDir().resolve(relativePath));
-                    case DATA:
-                        return Arrays.stream(pathLookup.dataDirs()).map(d -> d.resolve(relativePath));
-                    default:
-                        throw new IllegalArgumentException();
-                }
-            }
-
-            @Override
-            public Mode mode() {
-                return mode;
-            }
-
-            @Override
-            public boolean equals(Object obj) {
-                if (obj == this) return true;
-                if (obj == null || obj.getClass() != this.getClass()) return false;
-                var that = (RelativePathFileData) obj;
-                return Objects.equals(this.mode, that.mode)
-                    && Objects.equals(this.relativePath, that.relativePath)
-                    && Objects.equals(this.baseDir, that.baseDir);
-            }
+        Stream<Path> resolvePaths(PathLookup pathLookup);
 
-            @Override
-            public int hashCode() {
-                return Objects.hash(relativePath, baseDir, mode);
-            }
-        }
+        Mode mode();
 
         static FileData ofPath(Path path, Mode mode) {
             assert path.isAbsolute();
@@ -128,10 +54,29 @@ static FileData ofRelativePath(Path relativePath, BaseDir baseDir, Mode mode) {
             assert relativePath.isAbsolute() == false;
             return new RelativePathFileData(relativePath, baseDir, mode);
         }
+    }
 
-        Stream<Path> resolvePaths(PathLookup pathLookup);
+    private record AbsolutePathFileData(Path path, Mode mode) implements FileData {
+        @Override
+        public Stream<Path> resolvePaths(PathLookup pathLookup) {
+            return Stream.of(path);
+        }
+    }
 
-        Mode mode();
+    private record RelativePathFileData(Path relativePath, BaseDir baseDir, Mode mode) implements FileData {
+
+        @Override
+        public Stream<Path> resolvePaths(PathLookup pathLookup) {
+            Objects.requireNonNull(pathLookup);
+            switch (baseDir) {
+                case CONFIG:
+                    return Stream.of(pathLookup.configDir().resolve(relativePath));
+                case DATA:
+                    return Arrays.stream(pathLookup.dataDirs()).map(d -> d.resolve(relativePath));
+                default:
+                    throw new IllegalArgumentException();
+            }
+        }
     }
 
     private static Mode parseMode(String mode) {