private boolean okToReadBeforeInitialized()

in nullaway/src/main/java/com/uber/nullaway/NullAway.java [1495:1535]
38 lines of code
13 McCabe index (conditional complexity)

  private boolean okToReadBeforeInitialized(TreePath path, VisitorState state) {
    TreePath parentPath = path.getParentPath();
    Tree leaf = path.getLeaf();
    Tree parent = parentPath.getLeaf();
    if (parent instanceof AssignmentTree) {
      // ok if it's actually a write
      AssignmentTree assignment = (AssignmentTree) parent;
      return assignment.getVariable().equals(leaf);
    } else if (parent instanceof BinaryTree) {
      // ok if we're comparing to null
      BinaryTree binaryTree = (BinaryTree) parent;
      Tree.Kind kind = binaryTree.getKind();
      if (kind.equals(Tree.Kind.EQUAL_TO) || kind.equals(Tree.Kind.NOT_EQUAL_TO)) {
        ExpressionTree left = binaryTree.getLeftOperand();
        ExpressionTree right = binaryTree.getRightOperand();
        return (left.equals(leaf) && right.getKind().equals(Tree.Kind.NULL_LITERAL))
            || (right.equals(leaf) && left.getKind().equals(Tree.Kind.NULL_LITERAL));
      }
    } else if (parent instanceof MethodInvocationTree) {
      // ok if it's invoking castToNonNull and the read is the argument
      MethodInvocationTree methodInvoke = (MethodInvocationTree) parent;
      Symbol.MethodSymbol methodSymbol = ASTHelpers.getSymbol(methodInvoke);
      String qualifiedName =
          ASTHelpers.enclosingClass(methodSymbol) + "." + methodSymbol.getSimpleName().toString();
      List<? extends ExpressionTree> arguments = methodInvoke.getArguments();
      Integer castToNonNullArg;
      if (qualifiedName.equals(config.getCastToNonNullMethod())
          && methodSymbol.getParameters().size() == 1) {
        castToNonNullArg = 0;
      } else {
        castToNonNullArg =
            handler.castToNonNullArgumentPositionsForMethod(
                arguments, null, new MethodAnalysisContext(this, state, methodSymbol));
      }
      if (castToNonNullArg != null && leaf.equals(arguments.get(castToNonNullArg))) {
        return true;
      }
      return false;
    }
    return false;
  }