[alefas] extensible OutOfCodeBlock modification tracking

java/java-impl/src/com/intellij/psi/impl/JavaPsiFacadeImpl.java

@@ -670,23 +670,22 @@ public class JavaPsiFacadeImpl extends JavaPsiFacadeEx implements Disposable {
       if (element instanceof PsiFileSystemItem) {
         return false;
       }
-      
+
       if (element == null || element.getParent() == null) return true;
 
-      while(true){
-        if (element instanceof PsiFile || element instanceof PsiDirectory || element == null){
+      PsiElement parent = element;
+      while (true) {
+        if (parent instanceof PsiFile || parent instanceof PsiDirectory || parent == null) {
           return false;
         }
-        PsiElement pparent = element.getParent();
-        if (element instanceof PsiClass) return false; // anonymous or local class
-        if (element instanceof PsiCodeBlock){
-          if (pparent instanceof PsiMethod || pparent instanceof PsiClassInitializer){
+        if (parent instanceof PsiClass) return false; // anonymous or local class
+        if (parent instanceof PsiModifiableCodeBlock) {
+          if (!((PsiModifiableCodeBlock)parent).shouldChangeModificationCount(element)) {
             return true;
           }
         }
-        element = pparent;
+        parent = parent.getParent();
       }
     }
-
   }
 }

java/java-impl/src/com/intellij/psi/impl/source/tree/java/PsiCodeBlockImpl.java

@@ -221,4 +221,9 @@ public class PsiCodeBlockImpl extends LazyParseablePsiElement implements PsiCode
     }
     return true;
   }
+
+  public boolean shouldChangeModificationCount(PsiElement place) {
+    PsiElement pparent = getParent();
+    return !(pparent instanceof PsiMethod || pparent instanceof PsiClassInitializer);
+  }
 }

java/openapi/src/com/intellij/psi/PsiCodeBlock.java

@@ -21,7 +21,7 @@ import org.jetbrains.annotations.Nullable;
 /**
  * Represents a Java code block, usually surrounded by curly braces.
  */
-public interface PsiCodeBlock extends PsiElement {
+public interface PsiCodeBlock extends PsiElement, PsiModifiableCodeBlock {
   /**
    * The empty array of PSI code blocks which can be reused to avoid unnecessary allocations.
    */

java/openapi/src/com/intellij/psi/PsiModifiableCodeBlock.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2000-2011 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 com.intellij.psi;
+
+/**
+ * Represents psi element, which can be modified without caches reset.
+ * @see com.intellij.psi.util.PsiModificationTracker#getOutOfCodeBlockModificationCount()
+ */
+public interface PsiModifiableCodeBlock {
+  /**
+   * @param place where change was detected
+   * @return false if specific caches could be saved after the change
+   */
+  boolean shouldChangeModificationCount(PsiElement place);
+}