code: public SigningPolicy getSigningPolicy(String subject) {
  
          if (this.policyDNMap == null) {
              return null;
          }
          return (SigningPolicy) this.policyDNMap.get(subject);
      }
docs: Returns signing policy associated with the given CA subject.
  
  @param subject
  CA's subject DN for which signing policy is
  required. The DN should be in Globus format (with slashes) and
  not reversed. See CertificateUtil.toGlobusID();
  @return
  Signing policy object associated with the CA's DN. Null
  if no policy was configured. SigningPolicy object might not
  have any applicable policy if none was configured or none was
  found in the policy file configured.