notnull

platform/core-api/src/com/intellij/lang/ASTNode.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2011 JetBrains s.r.o.
+ * Copyright 2000-2014 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.
@@ -291,6 +291,5 @@ public interface ASTNode extends UserDataHolder {
    * @param clazz expected psi class
    * @return the PSI element.
    */
-  @Nullable
-  <T extends PsiElement> T getPsi(Class<T> clazz);
+  <T extends PsiElement> T getPsi(@NotNull Class<T> clazz);
 }

platform/core-impl/src/com/intellij/psi/impl/source/tree/CompositeElement.java

@@ -771,8 +771,7 @@ public class CompositeElement extends TreeElement {
   }
 
   @Override
-  @Nullable
-  public <T extends PsiElement> T getPsi(Class<T> clazz) {
+  public <T extends PsiElement> T getPsi(@NotNull Class<T> clazz) {
     return LeafElement.getPsi(clazz, getPsi(), LOG);
   }
 

platform/core-impl/src/com/intellij/psi/impl/source/tree/LeafElement.java

@@ -290,16 +290,14 @@ public abstract class LeafElement extends TreeElement {
   }
 
   @Override
-  @Nullable
-  public <T extends PsiElement> T getPsi(Class<T> clazz) {
+  public <T extends PsiElement> T getPsi(@NotNull Class<T> clazz) {
     return getPsi(clazz, getPsi(), LOG);
   }
 
-  @Nullable
-  static <T extends PsiElement> T getPsi(Class<T> clazz, PsiElement element, Logger log) {
+  static <T extends PsiElement> T getPsi(@NotNull Class<T> clazz, PsiElement element, Logger log) {
     log.assertTrue(clazz.isInstance(element), "unexpected psi class. expected: " + clazz
                                              + " got: " + (element == null ? null : element.getClass()));
+    //noinspection unchecked
     return (T)element;
   }
-
 }