work-around bug in javac in Java 7

Author: jhump

compiler/src/main/java/dagger/internal/codegen/GraphAnalysisLoader.java

@@ -62,9 +62,9 @@ public GraphAnalysisLoader(ProcessingEnvironment processingEnv) {
    * in canonical class names).
    */
   @VisibleForTesting static TypeElement resolveType(Elements elements, String className) {
-    int index = nextDollar(className, className, 0);
+    int index = next$(className, className, 0);
     if (index == -1) {
-      return elements.getTypeElement(className);
+      return getTypeElement(elements, className);
     }
     // have to test various possibilities of replacing '$' with '.' since '.' in a canonical name
     // of a nested type is replaced with '$' in the binary name.
@@ -85,27 +85,27 @@ private static TypeElement resolveType(Elements elements, String className, Stri
 
     // We assume '$' should be converted to '.'. So we search for classes with dots first.
     sb.setCharAt(index, '.');
-    int nextIndex = nextDollar(className, sb, index + 1);
+    int nextIndex = next$(className, sb, index + 1);
     TypeElement type = nextIndex == -1
-        ? elements.getTypeElement(sb)
+        ? getTypeElement(elements, sb)
         : resolveType(elements, className, sb, nextIndex);
     if (type != null) {
       return type;
     }
 
     // if not found, change back to dollar and search.
     sb.setCharAt(index, '$');
-    nextIndex = nextDollar(className, sb, index + 1);
+    nextIndex = next$(className, sb, index + 1);
     return nextIndex == -1
-        ? elements.getTypeElement(sb)
+        ? getTypeElement(elements, sb)
         : resolveType(elements, className, sb, nextIndex);
   }
 
   /**
    * Finds the next {@code '$'} in a class name which can be changed to a {@code '.'} when computing
    * a canonical class name.
    */
-  private static int nextDollar(String className, CharSequence current, int searchStart) {
+  private static int next$(String className, CharSequence current, int searchStart) {
     while (true) {
       int index = className.indexOf('$', searchStart);
       if (index == -1) {
@@ -122,6 +122,18 @@ private static int nextDollar(String className, CharSequence current, int search
     }
   }
 
+  private static TypeElement getTypeElement(Elements elements, CharSequence className) {
+    try {
+      return elements.getTypeElement(className);
+    } catch (ClassCastException e) {
+      // work-around issue in javac in Java 7 where querying for non-existent type can
+      // throw a ClassCastException
+      // TODO(jh): refer to Oracle Bug ID if/when one is assigned to bug report
+      // (Review ID: JI-9027367)
+      return null;
+    }
+  }
+
   @Override public <T> ModuleAdapter<T> getModuleAdapter(Class<T> moduleClass) {
     throw new UnsupportedOperationException();
   }