Added extension point-like class ExternalAnnotationsProvider.

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/extAnnotations/ExternalAnnotationsProvider.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2010-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.lang.resolve.java.extAnnotations;
+
+import com.intellij.openapi.project.Project;
+import com.intellij.psi.PsiAnnotation;
+import com.intellij.psi.PsiModifierListOwner;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * This class should be eliminated when Kotlin will depend on IDEA 12.x (KT-2326)
+ * @author Evgeny Gerashchenko
+ * @since 6/26/12
+ */
+@Deprecated
+public abstract class ExternalAnnotationsProvider {
+    private static ExternalAnnotationsProvider instance;
+
+    @Nullable
+    public abstract PsiAnnotation findExternalAnnotation(@NotNull Project project, @NotNull PsiModifierListOwner listOwner, @NotNull String annotationFQN);
+
+    @Nullable
+    public abstract PsiAnnotation[] findExternalAnnotations(@NotNull Project project, @NotNull PsiModifierListOwner listOwner);
+
+    @NotNull
+    public static ExternalAnnotationsProvider getInstance() {
+        return instance;
+    }
+
+    public static void setInstance(@NotNull ExternalAnnotationsProvider instance) {
+        ExternalAnnotationsProvider.instance = instance;
+    }
+}