ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/handler/DeleteHandler.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * ONAP-PAP-REST
   4  * ================================================================================
   5  * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20 package org.onap.policy.pap.xacml.rest.handler;
  21
  22 import java.io.File;
  23 import java.io.IOException;
  24 import java.sql.Connection;
  25 import java.sql.DriverManager;
  26 import java.sql.ResultSet;
  27 import java.sql.SQLException;
  28 import java.sql.Statement;
  29 import java.util.List;
  30
  31 import javax.persistence.EntityManager;
  32 import javax.persistence.Query;
  33 import javax.servlet.http.HttpServletRequest;
  34 import javax.servlet.http.HttpServletResponse;
  35
  36 import org.onap.policy.common.logging.ONAPLoggingContext;
  37 import org.onap.policy.common.logging.eelf.MessageCodes;
  38 import org.onap.policy.common.logging.eelf.PolicyLogger;
  39 import org.onap.policy.common.logging.flexlogger.FlexLogger;
  40 import org.onap.policy.common.logging.flexlogger.Logger;
  41 import org.onap.policy.pap.xacml.rest.XACMLPapServlet;
  42 import org.onap.policy.pap.xacml.rest.components.PolicyDBDaoTransaction;
  43 import org.onap.policy.pap.xacml.rest.elk.client.PolicyElasticSearchController;
  44 import org.onap.policy.pap.xacml.rest.model.RemoveGroupPolicy;
  45 import org.onap.policy.pap.xacml.rest.util.JPAUtils;
  46 import org.onap.policy.rest.XACMLRestProperties;
  47 import org.onap.policy.rest.adapter.PolicyRestAdapter;
  48 import org.onap.policy.rest.jpa.PolicyEntity;
  49 import org.onap.policy.rest.jpa.PolicyVersion;
  50 import org.onap.policy.utils.PolicyUtils;
  51 import org.onap.policy.xacml.api.XACMLErrorConstants;
  52 import org.onap.policy.xacml.api.pap.OnapPDPGroup;
  53 import org.onap.policy.xacml.std.pap.StdPAPPolicy;
  54 import org.onap.policy.xacml.std.pap.StdPDPGroup;
  55
  56 import com.att.research.xacml.api.pap.PAPException;
  57 import com.att.research.xacml.api.pap.PDPPolicy;
  58 import com.att.research.xacml.util.XACMLProperties;
  59
  60 public class DeleteHandler {
  61
  62         private OnapPDPGroup newgroup;
  63         private static Logger logger = FlexLogger.getLogger(DeleteHandler.class);
  64         public static final String POLICY_IN_PDP = "PolicyInPDP";
  65         public static final String ERROR = "error";
  66         public static final String UNKNOWN = "unknown";
  67         private static final String REGEX = "[0-9a-zA-Z._]*";
  68
  69         public void doAPIDeleteFromPAP(HttpServletRequest request, HttpServletResponse response) throws IOException, SQLException  {
  70                 // get the request content into a String
  71                 String json = null;
  72                 java.util.Scanner scanner = new java.util.Scanner(request.getInputStream());
  73                 scanner.useDelimiter("\\A");
  74                 json =  scanner.hasNext() ? scanner.next() : "";
  75                 scanner.close();
  76                 PolicyLogger.info("JSON request from API to Delete Policy from the PAP: " + json);
  77                 // convert Object sent as JSON into local object
  78                 StdPAPPolicy policy = PolicyUtils.jsonStringToObject(json, StdPAPPolicy.class);
  79                 String policyName = policy.getPolicyName();
  80                 Boolean policyVersionDeleted = false;
  81                 String removeXMLExtension;
  82                 int currentVersion;
  83                 String removeVersionExtension;
  84                 String splitPolicyName = null;
  85                 String[] split = null;
  86                 String status = ERROR;
  87                 PolicyEntity policyEntity = null;
  88                 JPAUtils jpaUtils = null;
  89
  90                 String papDbDriver = XACMLProperties.getProperty(XACMLRestProperties.PROP_PAP_DB_DRIVER);
  91                 String papDbUrl = XACMLProperties.getProperty(XACMLRestProperties.PROP_PAP_DB_URL);
  92                 String papDbUser = XACMLProperties.getProperty(XACMLRestProperties.PROP_PAP_DB_USER);
  93                 String papDbPassword = XACMLProperties.getProperty(XACMLRestProperties.PROP_PAP_DB_PASSWORD);
  94                 Connection con = null;
  95
  96                 try {
  97                         jpaUtils = JPAUtils.getJPAUtilsInstance(XACMLPapServlet.getEmf());
  98                 } catch (Exception e) {
  99                         PolicyLogger.error(MessageCodes.EXCEPTION_ERROR, e, "XACMLPapServlet", " Could not create JPAUtils instance on the PAP");
 100                         response.addHeader(ERROR, "jpautils");
 101                         response.addHeader("operation", "delete");
 102                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
 103                         return;
 104                 }
 105                 if (jpaUtils.dbLockdownIgnoreErrors()) {
 106                         PolicyLogger.warn("Policies are locked down");
 107                         response.addHeader("operation", "delete");
 108                         response.addHeader("lockdown", "true");
 109                         response.setStatus(HttpServletResponse.SC_ACCEPTED);
 110                         return;
 111                 }
 112                 EntityManager em = XACMLPapServlet.getEmf().createEntityManager();
 113                 Query policyEntityQuery = null;
 114                 try{
 115                         if(policyName.endsWith(".xml")){
 116                                 removeXMLExtension = policyName.replace(".xml", "");
 117                                 currentVersion = Integer.parseInt(removeXMLExtension.substring(removeXMLExtension.lastIndexOf('.')+1));
 118                                 removeVersionExtension = removeXMLExtension.substring(0, removeXMLExtension.lastIndexOf('.'));
 119                                 boolean queryCheck = true;
 120                                 if(policy.getDeleteCondition().equalsIgnoreCase("All Versions")){
 121                                         if(policyName.contains("Config_")){
 122                                                 splitPolicyName = removeVersionExtension.replace(".Config_", ":Config_");
 123                                         }else if(policyName.contains("Action_")){
 124                                                 splitPolicyName = removeVersionExtension.replace(".Action_", ":Action_");
 125                                         }else if(policyName.contains("Decision_")){
 126                                                 splitPolicyName = removeVersionExtension.replace(".Decision_", ":Decision_");
 127                                         }
 128                                         if(splitPolicyName != null){
 129                                                 split = splitPolicyName.split(":");
 130                                         }else{
 131                                                 PolicyLogger.error(MessageCodes.ERROR_UNKNOWN + "Failed to delete the policy. Please, provide the valid policyname.");
 132                                                 response.addHeader(ERROR, UNKNOWN);
 133                                                 response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR );
 134                                                 return;
 135                                         }
 136                                         policyEntityQuery = em.createQuery("SELECT p FROM PolicyEntity p WHERE p.policyName LIKE :pName and p.scope=:pScope");
 137                                 }else if(policy.getDeleteCondition().equalsIgnoreCase("Current Version")) {
 138                                         if(policyName.contains("Config_")){
 139                                                 splitPolicyName = policyName.replace(".Config_", ":Config_");
 140                                         }else if(policyName.contains("Action_")){
 141                                                 splitPolicyName = policyName.replace(".Action_", ":Action_");
 142                                         }else if(policyName.contains("Decision_")){
 143                                                 splitPolicyName = policyName.replace(".Decision_", ":Decision_");
 144                                         }
 145                                         split = splitPolicyName.split(":");
 146                                         queryCheck = false;
 147                                         policyEntityQuery = em.createQuery("SELECT p FROM PolicyEntity p WHERE p.policyName=:pName and p.scope=:pScope");
 148                                 }
 149
 150                                 if(queryCheck){
 151                                         policyEntityQuery.setParameter("pName", "%"+split[1]+"%");
 152                                 }else{
 153                                         policyEntityQuery.setParameter("pName", split[1]);
 154                                 }
 155
 156                                 policyEntityQuery.setParameter("pScope", split[0]);
 157                                 List<?> peResult = policyEntityQuery.getResultList();
 158                                 if(!peResult.isEmpty()){
 159                                         Query getPolicyVersion = em.createQuery("Select p from PolicyVersion p where p.policyName=:pname");
 160                                         getPolicyVersion.setParameter("pname", removeVersionExtension.replace(".", File.separator));
 161                                         List<?> pvResult = getPolicyVersion.getResultList();
 162                                         PolicyVersion pVersion = (PolicyVersion) pvResult.get(0);
 163                                         int newVersion = 0;
 164                                         em.getTransaction().begin();
 165                                         Class.forName(papDbDriver);
 166                                         con = DriverManager.getConnection(papDbUrl,papDbUser,papDbPassword);
 167
 168                                         if(policy.getDeleteCondition().equalsIgnoreCase("All Versions")){
 169                                                 boolean groupCheck = checkPolicyGroupEntity(con, peResult);
 170                                                 if(!groupCheck){
 171                                                         for(Object peData : peResult){
 172                                                                 policyEntity = (PolicyEntity) peData;
 173                                                                 status = deletePolicyEntityData(em, policyEntity);
 174                                                         }
 175                                                 }else{
 176                                                         status = POLICY_IN_PDP;
 177                                                 }
 178                                                 if(status.equals(ERROR)){
 179                                                         PolicyLogger.error(MessageCodes.ERROR_DATA_ISSUE + "Exception Occured while deleting the Entity from Database.");
 180                                                         response.addHeader(ERROR, UNKNOWN);
 181                                                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR );
 182                                                         return;
 183                                                 }else if(status.equals(POLICY_IN_PDP)){
 184                                                         PolicyLogger.error(MessageCodes.GENERAL_WARNING + "Policy can't be deleted, it is active in PDP Groups.");
 185                                                         response.addHeader(ERROR, POLICY_IN_PDP);
 186                                                         response.setStatus(HttpServletResponse.SC_CONFLICT);
 187                                                         return;
 188                                                 }else{
 189                                                         try{
 190                                                                 policyVersionDeleted = true;
 191                                                                 em.remove(pVersion);
 192                                                         }catch(Exception e){
 193                                                                 logger.error(e.getMessage(),e);
 194                                                                 policyVersionDeleted = false;
 195                                                         }
 196                                                 }
 197                                         }else if(policy.getDeleteCondition().equalsIgnoreCase("Current Version")){
 198                                                 boolean groupCheck = checkPolicyGroupEntity(con, peResult);
 199                                                 if(!groupCheck){
 200                                                         policyEntity = (PolicyEntity) peResult.get(0);
 201                                                         status = deletePolicyEntityData(em, policyEntity);
 202                                                 }else{
 203                                                         status = POLICY_IN_PDP;
 204                                                 }
 205
 206                                                 if(ERROR.equals(status)){
 207                                                         PolicyLogger.error(MessageCodes.ERROR_DATA_ISSUE + "Exception Occured while deleting the Entity from Database.");
 208                                                         response.addHeader(ERROR, UNKNOWN);
 209                                                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR );
 210                                                         return;
 211                                                 }else if(POLICY_IN_PDP.equals(status)){
 212                                                         PolicyLogger.error(MessageCodes.GENERAL_WARNING + "Policy can't be deleted, it is active in PDP Groups.");
 213                                                         response.addHeader(ERROR, POLICY_IN_PDP);
 214                                                         response.setStatus(HttpServletResponse.SC_CONFLICT);
 215                                                         return;
 216                                                 }else{
 217                                                         if(currentVersion > 1){
 218                                                                 if(!peResult.isEmpty()){
 219                                                                         for(Object object : peResult){
 220                                                                                 policyEntity = (PolicyEntity) object;
 221                                                                                 String policyEntityName = policyEntity.getPolicyName().replace(".xml", "");
 222                                                                                 int policyEntityVersion = Integer.parseInt(policyEntityName.substring(policyEntityName.lastIndexOf('.')+1));
 223                                                                                 if(policyEntityVersion > newVersion){
 224                                                                                         newVersion = policyEntityVersion-1;
 225                                                                                 }
 226                                                                         }
 227                                                                 }
 228                                                                 pVersion.setActiveVersion(newVersion);
 229                                                                 pVersion.setHigherVersion(newVersion);
 230                                                                 try{
 231                                                                         policyVersionDeleted = true;
 232                                                                         em.persist(pVersion);
 233                                                                 }catch(Exception e){
 234                                                                         logger.error(e.getMessage(),e);
 235                                                                         policyVersionDeleted = false;
 236                                                                 }
 237                                                         }else{
 238                                                                 try{
 239                                                                         policyVersionDeleted = true;
 240                                                                         em.remove(pVersion);
 241                                                                 }catch(Exception e){
 242                                                                         logger.error(e.getMessage(),e);
 243                                                                         policyVersionDeleted = false;
 244                                                                 }
 245                                                         }
 246                                                 }
 247                                         }
 248                                 }else{
 249                                         PolicyLogger.error(MessageCodes.ERROR_UNKNOWN + "Failed to delete the policy for an unknown reason.  Check the file system and other logs for further information.");
 250                                         response.addHeader(ERROR, UNKNOWN);
 251                                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR );
 252                                         return;
 253                                 }
 254                         }
 255                         em.getTransaction().commit();
 256                 }catch(Exception e){
 257                         em.getTransaction().rollback();
 258                         PolicyLogger.error(MessageCodes.EXCEPTION_ERROR, e, "XACMLPapServlet", " ERROR");
 259                         response.addHeader(ERROR, "deleteDB");
 260                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
 261                         return;
 262                 } finally {
 263                         em.close();
 264                         if(con != null){
 265                                 con.close();
 266                         }
 267                 }
 268
 269                 if (policyVersionDeleted) {
 270                         response.setStatus(HttpServletResponse.SC_OK);
 271                         response.addHeader("successMapKey", "success");
 272                         response.addHeader("operation", "delete");
 273                         return;
 274                 } else {
 275                         PolicyLogger.error(MessageCodes.ERROR_UNKNOWN + "Failed to delete the policy for an unknown reason.  Check the file system and other logs for further information.");
 276                         response.addHeader(ERROR, UNKNOWN);
 277                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR );
 278                         return;
 279                 }
 280         }
 281
 282         public static String deletePolicyEntityData(EntityManager em, PolicyEntity policyEntity){
 283                 PolicyElasticSearchController controller = new PolicyElasticSearchController();
 284                 PolicyRestAdapter policyData = new PolicyRestAdapter();
 285                 String policyName = policyEntity.getPolicyName();
 286                 try{
 287                         if(policyName.contains("Config_")){
 288                                 em.remove(policyEntity.getConfigurationData());
 289                         }else if(policyName.contains("Action_")){
 290                                 em.remove(policyEntity.getActionBodyEntity());
 291                         }
 292                         String searchPolicyName = policyEntity.getScope() + "." + policyEntity.getPolicyName();
 293                         policyData.setNewFileName(searchPolicyName);
 294                         controller.deleteElk(policyData);
 295                         em.remove(policyEntity);
 296                 }catch(Exception e){
 297                         logger.error(e.getMessage(),e);
 298                         return ERROR;
 299                 }
 300                 return "success";
 301         }
 302
 303         public static boolean checkPolicyGroupEntity(Connection con, List<?> peResult) throws SQLException{
 304                 for(Object peData : peResult){
 305                         PolicyEntity policyEntity = (PolicyEntity) peData;
 306                         try(Statement st = con.createStatement();
 307                                         ResultSet rs = st.executeQuery("Select * from PolicyGroupEntity where policyid = '"+policyEntity.getPolicyId()+"'")){
 308                                 boolean gEntityList = rs.next();
 309                                 if(gEntityList){
 310                                         return true;
 311                                 }
 312                         }
 313                 }
 314                 return false;
 315         }
 316
 317         public void doAPIDeleteFromPDP(HttpServletRequest request, HttpServletResponse response, ONAPLoggingContext loggingContext) throws IOException {
 318
 319                 String policyName = request.getParameter("policyName");
 320                 String groupId = request.getParameter("groupId");
 321                 String responseString = null;
 322
 323                 if(groupId != null && !groupId.matches(REGEX) ){
 324                         response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
 325                         response.addHeader("error",ERROR);
 326                         response.addHeader("message", "Group Id is not valid");
 327                         return;
 328                 }
 329
 330                 PolicyLogger.info("JSON request from API to Delete Policy from the PDP: " + policyName);
 331
 332                 // for PUT operations the group may or may not need to exist before the operation can be done
 333                 OnapPDPGroup group = null;
 334                 try {
 335                         group = XACMLPapServlet.getPAPEngine().getGroup(groupId);
 336                 } catch (PAPException e) {
 337                         PolicyLogger.error("Exception occured While PUT operation is performing for PDP Group"+e);
 338                 }
 339                 if (group == null) {
 340                         String message = "Unknown groupId '" + groupId + "'.";
 341                         PolicyLogger.error(MessageCodes.ERROR_DATA_ISSUE + " " + message);
 342                         loggingContext.transactionEnded();
 343                         PolicyLogger.audit("Transaction Failed - See Error.log");
 344                         response.addHeader(ERROR, "UnknownGroup");
 345                         response.addHeader("message", message);
 346                         response.setStatus(HttpServletResponse.SC_NOT_FOUND);
 347                         return;
 348                 } else {
 349                         loggingContext.setServiceName("API:PAP.deletPolicyFromPDPGroup");
 350                         if (policyName.contains("xml")) {
 351                                 PolicyLogger.debug("The full file name including the extension was provided for policyName.. continue.");
 352                         } else {
 353                                 String message = XACMLErrorConstants.ERROR_DATA_ISSUE + "Invalid policyName... "
 354                                                 + "policyName must be the full name of the file to be deleted including version and extension";
 355                                 PolicyLogger.error(MessageCodes.ERROR_DATA_ISSUE + " Invalid policyName... "
 356                                                 + "policyName must be the full name of the file to be deleted including version and extension");
 357                                 response.addHeader(ERROR, message);
 358                         response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
 359                                 return;
 360                         }
 361                         RemoveGroupPolicy removePolicy = new RemoveGroupPolicy((StdPDPGroup) group);
 362                         PDPPolicy policy =  group.getPolicy(policyName);
 363                         if (policy != null) {
 364
 365                                 if ((policy.getId().contains("Config_MS_")) || (policy.getId().contains("BRMS_Param"))) {
 366                                         if (preSafetyCheck(policy)) {
 367                                                 PolicyLogger.debug("Precheck Successful.");
 368                                         }
 369                                 }
 370                                 PolicyLogger.info("Preparing to remove policy from group: " + group.getId());
 371                                 removePolicy.prepareToRemove(policy);
 372                                 OnapPDPGroup updatedGroup = removePolicy.getUpdatedObject();
 373                                 responseString = deletePolicyFromPDPGroup(updatedGroup, loggingContext);
 374                         } else {
 375                                 String message = XACMLErrorConstants.ERROR_DATA_ISSUE + "Policy does not exist on the PDP.";
 376                                 PolicyLogger.error(message);
 377                                 PolicyLogger.error(MessageCodes.ERROR_DATA_ISSUE + " Policy does not exist on the PDP.");
 378                                 response.addHeader(ERROR, message);
 379                                 response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
 380                                 return;
 381                         }
 382                 }
 383                 if (responseString.equals("success")) {
 384                         loggingContext.transactionEnded();
 385                         PolicyLogger.info("Policy successfully deleted!");
 386                         PolicyLogger.audit("Policy successfully deleted!");
 387                         response.setStatus(HttpServletResponse.SC_OK);
 388                         response.addHeader("successMapKey", "success");
 389                         response.addHeader("operation", "delete");
 390                         return;
 391                 } else if (responseString.equals("No Group")) {
 392                         String message = XACMLErrorConstants.ERROR_DATA_ISSUE + "Group update had bad input.";
 393                         PolicyLogger.error(MessageCodes.ERROR_DATA_ISSUE + " Group update had bad input.");
 394                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
 395                         response.addHeader(ERROR, "groupUpdate");
 396                         response.addHeader("message", message);
 397                         return;
 398                 } else if (responseString.equals("DB Error")) {
 399                         PolicyLogger.error(MessageCodes.ERROR_PROCESS_FLOW + " Error while updating group in the database");
 400                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
 401                         response.addHeader(ERROR, "deleteDB");
 402                         return;
 403                 } else {
 404                         PolicyLogger.error(MessageCodes.ERROR_UNKNOWN + " Failed to delete the policy for an unknown reason.  Check the file system and other logs for further information.");
 405                         response.addHeader(ERROR, UNKNOWN);
 406                         response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR );
 407                         return;
 408                 }
 409         }
 410
 411         private String deletePolicyFromPDPGroup (OnapPDPGroup group, ONAPLoggingContext loggingContext){
 412                 PolicyDBDaoTransaction acPutTransaction = XACMLPapServlet.getDbDaoTransaction();
 413                 String response = null;
 414                 loggingContext.setServiceName("API:PAP.DeleteHandler");
 415                 OnapPDPGroup existingGroup = null;
 416                 try {
 417                         existingGroup = XACMLPapServlet.getPAPEngine().getGroup(group.getId());
 418                 } catch (PAPException e1) {
 419                         PolicyLogger.error("Exception occured While Deleting Policy From PDP Group"+e1);
 420                 }
 421                 if (!(group instanceof StdPDPGroup) || existingGroup == null || !(group.getId().equals(existingGroup.getId()))) {
 422                         String existingID = null;
 423                         if(existingGroup != null){
 424                                 existingID = existingGroup.getId();
 425                         }
 426                         PolicyLogger.error(MessageCodes.ERROR_DATA_ISSUE + " Group update had bad input. id=" + existingID + " objectFromJSON="+group);
 427                         loggingContext.transactionEnded();
 428                         PolicyLogger.audit("Transaction Failed - See Error.log");
 429                         response = "No Group";
 430                         return response;
 431                 }
 432                 // The Path on the PAP side is not carried on the RESTful interface with the AC
 433                 // (because it is local to the PAP)
 434                 // so we need to fill that in before submitting the group for update
 435                 ((StdPDPGroup)group).setDirectory(((StdPDPGroup)existingGroup).getDirectory());
 436                 try{
 437                         acPutTransaction.updateGroup(group, "XACMLPapServlet.doDelete");
 438                 } catch(Exception e){
 439                         PolicyLogger.error(MessageCodes.ERROR_PROCESS_FLOW, e, "XACMLPapServlet", " Error while updating group in the database: "
 440                                         +"group="+existingGroup.getId());
 441                         response = "DB Error";
 442                         return response;
 443                 }
 444                 try {
 445                         XACMLPapServlet.getPAPEngine().updateGroup(group);
 446                 } catch (PAPException e) {
 447                         PolicyLogger.error("Exception occured While Updating PDP Groups"+e);
 448                         response = "error in updateGroup method";
 449                 }
 450                 PolicyLogger.debug("Group '" + group.getId() + "' updated");
 451                 acPutTransaction.commitTransaction();
 452                 // Group changed, which might include changing the policies
 453                 try {
 454                         newgroup = existingGroup;
 455                 }  catch (Exception e) {
 456                         PolicyLogger.error("Exception occured in Group Change Method"+e);
 457                         response = "error in groupChanged method";
 458                 }
 459                 if (response==null){
 460                         response = "success";
 461                         loggingContext.transactionEnded();
 462                         PolicyLogger.audit("Policy successfully deleted!");
 463                 }
 464                 loggingContext.transactionEnded();
 465                 PolicyLogger.audit("Transaction Ended");
 466                 return response;
 467         }
 468
 469         public OnapPDPGroup getDeletedGroup(){
 470                 return newgroup;
 471         }
 472
 473         public boolean preSafetyCheck(PDPPolicy policy) {
 474                 return true;
 475         }
 476
 477         public static DeleteHandler getInstance() {
 478                 try {
 479                         Class<?> deleteHandler = Class.forName(XACMLProperties.getProperty("deletePolicy.impl.className", DeleteHandler.class.getName()));
 480                         return (DeleteHandler) deleteHandler.newInstance();
 481                 } catch (Exception e) {
 482                         logger.error(e.getMessage(),e);
 483                 }
 484                 return null;
 485         }
 486
 487 }