Java back-end compiler extension point

java/compiler/impl/src/com/intellij/compiler/CompilerConfigurationImpl.java

@@ -20,9 +20,12 @@ import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.application.ApplicationNamesInfo;
 import com.intellij.openapi.application.ex.ApplicationManagerEx;
 import com.intellij.openapi.compiler.CompilerBundle;
+import com.intellij.openapi.compiler.CompilerManager;
 import com.intellij.openapi.compiler.options.ExcludedEntriesConfiguration;
 import com.intellij.openapi.components.*;
 import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.extensions.Extensions;
+import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.module.ModuleManager;
 import com.intellij.openapi.project.ModuleListener;
@@ -47,9 +50,9 @@ import java.util.*;
 @State(
   name = "CompilerConfiguration",
   storages = {
-    @Storage(id = "default", file = "$PROJECT_FILE$")
-   ,@Storage(id = "dir", file = "$PROJECT_CONFIG_DIR$/compiler.xml", scheme = StorageScheme.DIRECTORY_BASED)
-    }
+    @Storage(id = "default", file = "$PROJECT_FILE$"),
+    @Storage(id = "dir", file = "$PROJECT_CONFIG_DIR$/compiler.xml", scheme = StorageScheme.DIRECTORY_BASED)
+  }
 )
 public class CompilerConfigurationImpl extends CompilerConfiguration implements PersistentStateComponent<Element>, ProjectComponent {
   private static final Logger LOG = Logger.getInstance("#com.intellij.compiler.CompilerConfiguration");
@@ -231,12 +234,24 @@ public class CompilerConfigurationImpl extends CompilerConfiguration implements
       }
 
       try {
-        CompilerAPICompiler inprocessJavaCompiler = new CompilerAPICompiler(myProject);
-        myRegisteredCompilers.add(inprocessJavaCompiler);
+        CompilerAPICompiler inProcessJavaCompiler = new CompilerAPICompiler(myProject);
+        myRegisteredCompilers.add(inProcessJavaCompiler);
       }
       catch (NoClassDefFoundError e) {
         // wrong JDK
       }
+
+      final BackendCompiler[] compilers = Extensions.getExtensions(BackendCompiler.EP_NAME, myProject);
+      final Set<FileType> types = new HashSet<FileType>();
+      for (BackendCompiler compiler : compilers) {
+        myRegisteredCompilers.add(compiler);
+        types.addAll(compiler.getCompilableFileTypes());
+      }
+
+      final CompilerManager compilerManager = CompilerManager.getInstance(myProject);
+      for (FileType type : types) {
+        compilerManager.addCompilableFileType(type);
+      }
     }
 
     myDefaultJavaCompiler = JAVAC_EXTERNAL_BACKEND;

java/compiler/impl/src/com/intellij/compiler/impl/javaCompiler/BackendCompiler.java

@@ -18,6 +18,7 @@ package com.intellij.compiler.impl.javaCompiler;
 import com.intellij.compiler.OutputParser;
 import com.intellij.openapi.compiler.CompileContext;
 import com.intellij.openapi.compiler.CompileScope;
+import com.intellij.openapi.extensions.ExtensionPointName;
 import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.openapi.options.Configurable;
 import org.jetbrains.annotations.NonNls;
@@ -28,6 +29,8 @@ import java.io.IOException;
 import java.util.Set;
 
 public interface BackendCompiler {
+  ExtensionPointName<BackendCompiler> EP_NAME = ExtensionPointName.create("com.intellij.java.compiler");
+
   @NotNull @NonNls String getId(); // used for externalization
   @NotNull String getPresentableName();
   @NotNull Configurable createConfigurable();
@@ -46,4 +49,4 @@ public interface BackendCompiler {
 
   @Nullable
   DependencyProcessor getDependencyProcessor();
-}
+}

java/compiler/impl/src/com/intellij/compiler/impl/javaCompiler/JavaCompiler.java

@@ -28,8 +28,6 @@ import com.intellij.compiler.make.CacheCorruptedException;
 import com.intellij.openapi.compiler.*;
 import com.intellij.openapi.compiler.ex.CompileContextEx;
 import com.intellij.openapi.diagnostic.Logger;
-import com.intellij.openapi.fileTypes.FileTypeManager;
-import com.intellij.openapi.fileTypes.StdFileTypes;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
@@ -41,7 +39,6 @@ import java.util.Arrays;
 public class JavaCompiler implements TranslatingCompiler {
   private static final Logger LOG = Logger.getInstance("#com.intellij.compiler.impl.javaCompiler.JavaCompiler");
   private final Project myProject;
-  private static final FileTypeManager FILE_TYPE_MANAGER = FileTypeManager.getInstance();
 
   public JavaCompiler(Project project) {
     myProject = project;
@@ -53,7 +50,7 @@ public class JavaCompiler implements TranslatingCompiler {
   }
 
   public boolean isCompilableFile(VirtualFile file, CompileContext context) {
-    return FILE_TYPE_MANAGER.getFileTypeByFile(file).equals(StdFileTypes.JAVA);
+    return getBackEndCompiler().getCompilableFileTypes().contains(file.getFileType());
   }
 
   public void compile(CompileContext context, Chunk<Module> moduleChunk, VirtualFile[] files, OutputSink sink) {

resources/src/META-INF/IdeaPlugin.xml

@@ -163,6 +163,8 @@
     <extensionPoint name="java.shortNamesCache" area="IDEA_PROJECT" interface="com.intellij.psi.search.PsiShortNamesCache"/>
 
     <extensionPoint name="attachSourcesProvider" interface="com.intellij.codeInsight.AttachSourcesProvider"/>
+
+    <extensionPoint name="java.compiler" area="IDEA_PROJECT" interface="com.intellij.compiler.impl.javaCompiler.BackendCompiler"/>
   </extensionPoints>
 
   <extensions defaultExtensionNs="com.intellij">