[FE] Add sealed classes related properties to java model

compiler/resolution.common.jvm/src/org/jetbrains/kotlin/load/java/structure/impl/JavaClassImpl.kt

@@ -59,6 +59,12 @@ class JavaClassImpl(psiClass: PsiClass) : JavaClassifierImpl<PsiClass>(psiClass)
     override val isEnum: Boolean
         get() = psi.isEnum
 
+    override val isSealed: Boolean
+        get() = JavaElementUtil.isSealed(this)
+
+    override val permittedTypes: Collection<JavaClassifierType>
+        get() = classifierTypes(psi.permitsListTypes)
+
     override val isRecord: Boolean
         get() = psi.isRecord
 

compiler/resolution.common.jvm/src/org/jetbrains/kotlin/load/java/structure/impl/JavaElementUtil.java

@@ -52,6 +52,10 @@ import static org.jetbrains.kotlin.load.java.structure.impl.JavaElementCollectio
         return owner.getPsi().hasModifierProperty(PsiModifier.FINAL);
     }
 
+    public static boolean isSealed(@NotNull JavaModifierListOwnerImpl owner) {
+        return owner.getPsi().hasModifierProperty(PsiModifier.SEALED);
+    }
+
     @NotNull
     public static Visibility getVisibility(@NotNull JavaModifierListOwnerImpl owner) {
         PsiModifierListOwner psiOwner = owner.getPsi();

compiler/resolution.common.jvm/src/org/jetbrains/kotlin/load/java/structure/impl/classFiles/BinaryJavaClass.kt

@@ -70,6 +70,9 @@ class BinaryJavaClass(
 
     override val lightClassOriginKind: LightClassOriginKind? get() = null
 
+    override val isSealed: Boolean get() = permittedTypes.isNotEmpty()
+    override val permittedTypes = arrayListOf<JavaClassifierType>()
+
     override fun isFromSourceCodeInScope(scope: SearchScope): Boolean = false
 
     override fun visitEnd() {
@@ -233,4 +236,8 @@ class BinaryJavaClass(
             )
         }
     }
+
+    override fun visitPermittedSubtypeExperimental(permittedSubtype: String?) {
+        permittedTypes.addIfNotNull(permittedSubtype?.convertInternalNameToClassifierType())
+    }
 }