From 0a0f60ea44276b034b239464d09b614c7d6ac0ca Mon Sep 17 00:00:00 2001
From: Peter Gromov <peter@jetbrains.com>
Date: Tue, 10 Feb 2009 01:13:17 +0300
Subject: [PATCH] jam for nested annotations

---
 .../src/com/intellij/psi/ref/InstanceofLink.java   | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 openapi/src/com/intellij/psi/ref/InstanceofLink.java

diff --git a/openapi/src/com/intellij/psi/ref/InstanceofLink.java b/openapi/src/com/intellij/psi/ref/InstanceofLink.java
new file mode 100644
index 0000000000..724533eeda
--- /dev/null
+++ b/openapi/src/com/intellij/psi/ref/InstanceofLink.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2000-2005 by JetBrains s.r.o. All Rights Reserved.
+ * Use is subject to license terms.
+ */
+package com.intellij.psi.ref;
+
+import com.intellij.psi.PsiChildLink;
+import com.intellij.psi.PsiElement;
+import com.intellij.util.IncorrectOperationException;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * @author peter
+ */
+public class InstanceofLink<Parent extends PsiElement, Child extends PsiElement, CastTo extends Child> extends PsiChildLink<Parent, CastTo> {
+  private final PsiChildLink<Parent, Child> myDelegate;
+  private final Class<CastTo> myCastTo;
+
+  private InstanceofLink(PsiChildLink<Parent, Child> delegate, Class<CastTo> castTo) {
+    myDelegate = delegate;
+    myCastTo = castTo;
+  }
+
+  public CastTo findLinkedChild(@Nullable Parent parent) {
+    final Child existing = myDelegate.findLinkedChild(parent);
+    return myCastTo.isInstance(existing) ? (CastTo) existing : null;
+  }
+
+  @NotNull
+  public CastTo createChild(@NotNull Parent parent) throws IncorrectOperationException {
+    return (CastTo) myDelegate.createChild(parent);
+  }
+
+  public static <Parent extends PsiElement, Child extends PsiElement, CastTo extends Child> InstanceofLink<Parent, Child, CastTo> create(
+    PsiChildLink<Parent, Child> delegate, Class<CastTo> castTo) {
+    return new InstanceofLink<Parent, Child, CastTo>(delegate, castTo);
+  }
+}
-- 
2.11.4.GIT