[java] IDEA-355048 Support binary files (.class) in split mode.

- support kotlin compiled classes

GitOrigin-RevId: 8a1ec87426603d017068bb2f311edb105fa5e977

java/java-frontback-psi-api/src/com/intellij/psi/compiled/ClassFileDecompilers.java

@@ -78,7 +78,8 @@ public final class ClassFileDecompilers {
   public final ExtensionPointName<Decompiler> EP_NAME = new ExtensionPointName<>("com.intellij.psi.classFileDecompiler");
 
   private ClassFileDecompilers() {
-    EP_NAME.addChangeListener(() -> BinaryFileTypeDecompilers.getInstance().notifyDecompilerSetChange(), null);
+    Runnable runnable = () -> BinaryFileTypeDecompilers.getInstance().notifyDecompilerSetChange();
+    EP_NAME.addChangeListener(runnable, null);
   }
 
   @SuppressWarnings("unchecked")

java/java-frontback-psi-impl/src/com/intellij/java/frontback/psi/impl/JavaLangLevelProjectCustomDataSynchronizer.kt

@@ -40,4 +40,8 @@ class LanguageLevelHolder(val languageLevel: LanguageLevel)
 class NullableLanguageLevelHolder(val languageLevel: LanguageLevel?)
 
 @Serializable
-class ClassFileInformation(val isClassFile: Boolean?)
+enum class ClassFileInformationType {
+  JAVA_CLASS_FILE, JAVA_CLASS_FILE_OUTSIDE
+}
+@Serializable
+class ClassFileInformation(val classFileInformationType: ClassFileInformationType?)

java/java-impl/src/com/intellij/openapi/roots/impl/JavaClassVirtualFileCustomDataProvider.kt

@@ -3,12 +3,15 @@ package com.intellij.openapi.roots.impl
 
 import com.intellij.ide.highlighter.JavaClassFileType
 import com.intellij.java.frontback.psi.impl.ClassFileInformation
+import com.intellij.java.frontback.psi.impl.ClassFileInformationType
 import com.intellij.openapi.application.readAction
 import com.intellij.openapi.diagnostic.logger
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.roots.FileIndexFacade
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.openapi.vfs.VirtualFileCustomDataProvider
+import com.intellij.psi.ClassFileViewProvider
+import com.intellij.psi.impl.PsiManagerEx
 import com.intellij.util.concurrency.annotations.RequiresReadLock
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.FlowCollector
@@ -28,6 +31,8 @@ class JavaClassVirtualFileCustomDataProvider : VirtualFileCustomDataProvider<Cla
 
   override fun getValues(project: Project, virtualFile: VirtualFile): Flow<ClassFileInformation> {
     if (virtualFile.fileType != JavaClassFileType.INSTANCE) return emptyFlow()
+    val viewProvider = PsiManagerEx.getInstanceEx(project).fileManager.findViewProvider(virtualFile)
+    if(viewProvider !is ClassFileViewProvider) return emptyFlow()
     return object : Flow<ClassFileInformation> {
       override suspend fun collect(collector: FlowCollector<ClassFileInformation>) {
         collector.emit(readAction {
@@ -44,6 +49,6 @@ class JavaClassVirtualFileCustomDataProvider : VirtualFileCustomDataProvider<Cla
   ): ClassFileInformation {
     val fileIndex = FileIndexFacade.getInstance(project)
     val isOutOfLibrary = !fileIndex.isInLibraryClasses(virtualFile) && fileIndex.isInSource(virtualFile)
-    return ClassFileInformation(!isOutOfLibrary)
+    return ClassFileInformation(if (isOutOfLibrary) ClassFileInformationType.JAVA_CLASS_FILE_OUTSIDE else ClassFileInformationType.JAVA_CLASS_FILE)
   }
 }