Creating mirror image of a Binary Tree

Creating a exact mirror image of binary tree

public void reverseTree(BinaryTree node) {
     if (node != null) {
     
//recursively call left and right elements
        reverseTree(node.left);
        reverseTree(node.right);

      //swap the elements
        BinaryTree temp = node.right;
        node.right = node.left;
        node.left = temp;      

   
     }
}

Time complexity: O(n)
Space complexity: O(n)