code: @Override
      public boolean contains(File policy) throws PolicyStoreException {
  
          try {
              return contains(utils.getPolicyName(policy));
          } catch (MelcoePDPException e) {
              throw new PolicyStoreException(e);
          }
      }
docs: Check if the policy identified by policyName exists.
  
  @param policy
  @return true iff the policy store contains a policy with the same
  PolicyId
  @throws PolicyStoreException