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