gerrit.onap Code Review - ccsdk/oran.git/blob

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * ONAP : ccsdk oran
   4  * ======================================================================
   5  * Copyright (C) 2019-2020 Nordix Foundation. 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
  21 package org.onap.ccsdk.oran.a1policymanagementservice.controllers.v2;
  22
  23 import com.google.gson.Gson;
  24 import com.google.gson.GsonBuilder;
  25
  26 import io.swagger.v3.oas.annotations.Operation;
  27 import io.swagger.v3.oas.annotations.Parameter;
  28 import io.swagger.v3.oas.annotations.media.Content;
  29 import io.swagger.v3.oas.annotations.media.Schema;
  30 import io.swagger.v3.oas.annotations.responses.ApiResponse;
  31 import io.swagger.v3.oas.annotations.responses.ApiResponses;
  32 import io.swagger.v3.oas.annotations.tags.Tag;
  33
  34 import java.lang.invoke.MethodHandles;
  35 import java.time.Instant;
  36 import java.util.ArrayList;
  37 import java.util.Collection;
  38 import java.util.List;
  39
  40 import lombok.Getter;
  41
  42 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
  43 import org.onap.ccsdk.oran.a1policymanagementservice.controllers.VoidResponse;
  44 import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
  45 import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
  46 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock;
  47 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock.LockType;
  48 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
  49 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policy;
  50 import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyType;
  51 import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyTypes;
  52 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
  53 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Rics;
  54 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Service;
  55 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Services;
  56 import org.slf4j.Logger;
  57 import org.slf4j.LoggerFactory;
  58 import org.springframework.beans.factory.annotation.Autowired;
  59 import org.springframework.http.HttpStatus;
  60 import org.springframework.http.HttpStatusCode;
  61 import org.springframework.http.MediaType;
  62 import org.springframework.http.ResponseEntity;
  63 import org.springframework.web.bind.annotation.DeleteMapping;
  64 import org.springframework.web.bind.annotation.GetMapping;
  65 import org.springframework.web.bind.annotation.PathVariable;
  66 import org.springframework.web.bind.annotation.PutMapping;
  67 import org.springframework.web.bind.annotation.RequestBody;
  68 import org.springframework.web.bind.annotation.RequestParam;
  69 import org.springframework.web.bind.annotation.RestController;
  70 import org.springframework.web.reactive.function.client.WebClientException;
  71 import org.springframework.web.reactive.function.client.WebClientResponseException;
  72 import reactor.core.publisher.Mono;
  73
  74 @RestController("PolicyControllerV2")
  75 @Tag(//
  76         name = PolicyController.API_NAME, //
  77         description = PolicyController.API_DESCRIPTION //
  78 )
  79 public class PolicyController {
  80
  81     public static final String API_NAME = "A1 Policy Management";
  82     public static final String API_DESCRIPTION = "";
  83
  84     public static class RejectionException extends Exception {
  85         private static final long serialVersionUID = 1L;
  86
  87         @Getter
  88         private final HttpStatus status;
  89
  90         public RejectionException(String message, HttpStatus status) {
  91             super(message);
  92             this.status = status;
  93         }
  94     }
  95
  96     @Autowired
  97     private Rics rics;
  98     @Autowired
  99     private PolicyTypes policyTypes;
 100     @Autowired
 101     private Policies policies;
 102     @Autowired
 103     private A1ClientFactory a1ClientFactory;
 104     @Autowired
 105     private Services services;
 106
 107     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 108     private static Gson gson = new GsonBuilder() //
 109             .create(); //
 110
 111     @GetMapping(path = Consts.V2_API_ROOT + "/policy-types/{policytype_id:.+}") //
 112     @Operation(summary = "Returns a policy type definition") //
 113     @ApiResponses(value = { //
 114             @ApiResponse(responseCode = "200", //
 115                     description = "Policy type", //
 116                     content = @Content(schema = @Schema(implementation = PolicyTypeInfo.class))), //
 117             @ApiResponse(responseCode = "404", //
 118                     description = "Policy type is not found", //
 119                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class)))//
 120     })
 121     public ResponseEntity<Object> getPolicyType( //
 122             @PathVariable("policytype_id") String policyTypeId) throws EntityNotFoundException {
 123         PolicyType type = policyTypes.getType(policyTypeId);
 124         PolicyTypeInfo info = new PolicyTypeInfo(type.getSchema());
 125         return new ResponseEntity<>(gson.toJson(info), HttpStatus.OK);
 126     }
 127
 128     @GetMapping(path = Consts.V2_API_ROOT + "/policy-types", produces = MediaType.APPLICATION_JSON_VALUE)
 129     @Operation(summary = "Query policy type identities")
 130     @ApiResponses(value = { //
 131             @ApiResponse(responseCode = "200", //
 132                     description = "Policy type IDs", //
 133                     content = @Content(schema = @Schema(implementation = PolicyTypeIdList.class))), //
 134             @ApiResponse(responseCode = "404", //
 135                     description = "Near-RT RIC is not found", //
 136                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))) //
 137     })
 138     public ResponseEntity<Object> getPolicyTypes( //
 139             @Parameter(name = Consts.RIC_ID_PARAM, required = false, //
 140                     description = "Select types for the given Near-RT RIC identity.") //
 141             @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ricId,
 142
 143             @Parameter(name = Consts.TYPE_NAME_PARAM, required = false, //
 144                     description = "Select types with the given type name (type identity has the format <typename_version>)") //
 145             @RequestParam(name = Consts.TYPE_NAME_PARAM, required = false) String typeName,
 146
 147             @Parameter(name = Consts.COMPATIBLE_WITH_VERSION_PARAM, required = false, //
 148                     description = "Select types that are compatible with the given version. This parameter is only applicable in conjunction with "
 149                             + Consts.TYPE_NAME_PARAM
 150                             + ". As an example version 1.9.1 is compatible with 1.0.0 but not the other way around."
 151                             + " Matching types will be returned sorted in ascending order.") //
 152             @RequestParam(name = Consts.COMPATIBLE_WITH_VERSION_PARAM, required = false) String compatibleWithVersion
 153
 154     ) throws ServiceException {
 155
 156         if (compatibleWithVersion != null && typeName == null) {
 157             throw new ServiceException("Parameter " + Consts.COMPATIBLE_WITH_VERSION_PARAM + " can only be used when "
 158                     + Consts.TYPE_NAME_PARAM + " is given", HttpStatus.BAD_REQUEST);
 159         }
 160
 161         Collection<PolicyType> types =
 162                 ricId != null ? rics.getRic(ricId).getSupportedPolicyTypes() : this.policyTypes.getAll();
 163
 164         types = PolicyTypes.filterTypes(types, typeName, compatibleWithVersion);
 165         return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
 166     }
 167
 168     @GetMapping(path = Consts.V2_API_ROOT + "/policies/{policy_id:.+}", produces = MediaType.APPLICATION_JSON_VALUE)
 169     @Operation(summary = "Returns a policy") //
 170     @ApiResponses(value = { //
 171             @ApiResponse(responseCode = "200", //
 172                     description = "Policy found", //
 173                     content = @Content(schema = @Schema(implementation = PolicyInfo.class))), //
 174             @ApiResponse(responseCode = "404", //
 175                     description = "Policy is not found", //
 176                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))) //
 177     })
 178     public ResponseEntity<Object> getPolicy( //
 179             @PathVariable(name = Consts.POLICY_ID_PARAM, required = true) String id) throws EntityNotFoundException {
 180         Policy p = policies.getPolicy(id);
 181         return new ResponseEntity<>(gson.toJson(toPolicyInfo(p)), HttpStatus.OK);
 182     }
 183
 184     @DeleteMapping(Consts.V2_API_ROOT + "/policies/{policy_id:.+}")
 185     @Operation(summary = "Delete a policy")
 186     @ApiResponses(value = { //
 187             @ApiResponse(responseCode = "200", //
 188                     description = "Not used", //
 189                     content = @Content(schema = @Schema(implementation = VoidResponse.class))), //
 190             @ApiResponse(responseCode = "204", //
 191                     description = "Policy deleted", //
 192                     content = @Content(schema = @Schema(implementation = VoidResponse.class))), //
 193             @ApiResponse(responseCode = "404", //
 194                     description = "Policy is not found", //
 195                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))), //
 196             @ApiResponse(responseCode = "423", //
 197                     description = "Near-RT RIC is not operational", //
 198                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))) //
 199     })
 200     public Mono<ResponseEntity<Object>> deletePolicy( //
 201             @PathVariable(Consts.POLICY_ID_PARAM) String policyId) throws EntityNotFoundException {
 202         Policy policy = policies.getPolicy(policyId);
 203         keepServiceAlive(policy.getOwnerServiceId());
 204
 205         return policy.getRic().getLock().lock(LockType.SHARED, "deletePolicy") //
 206                 .flatMap(grant -> deletePolicy(grant, policy));
 207     }
 208
 209     Mono<ResponseEntity<Object>> deletePolicy(Lock.Grant grant, Policy policy) {
 210         return assertRicStateIdle(policy.getRic()) //
 211                 .flatMap(notUsed -> a1ClientFactory.createA1Client(policy.getRic())) //
 212                 .doOnNext(notUsed -> policies.remove(policy)) //
 213                 .doFinally(x -> grant.unlockBlocking()) //
 214                 .flatMap(client -> client.deletePolicy(policy)) //
 215                 .map(notUsed -> new ResponseEntity<>(HttpStatus.NO_CONTENT)) //
 216                 .onErrorResume(this::handleException);
 217     }
 218
 219     @PutMapping(path = Consts.V2_API_ROOT + "/policies", produces = MediaType.APPLICATION_JSON_VALUE)
 220     @Operation(summary = "Create or update a policy")
 221     @ApiResponses(value = { //
 222             @ApiResponse(responseCode = "201", //
 223                     description = "Policy created", //
 224                     content = @Content(schema = @Schema(implementation = VoidResponse.class))), //
 225             @ApiResponse(responseCode = "200", //
 226                     description = "Policy updated", //
 227                     content = @Content(schema = @Schema(implementation = VoidResponse.class))), //
 228             @ApiResponse(responseCode = "423", //
 229                     description = "Near-RT RIC is not operational", //
 230                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))), //
 231             @ApiResponse(responseCode = "404", //
 232                     description = "Near-RT RIC or policy type is not found", //
 233                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))) //
 234     })
 235     public Mono<ResponseEntity<Object>> putPolicy(@RequestBody PolicyInfo policyInfo) throws EntityNotFoundException {
 236
 237         if (!policyInfo.validate()) {
 238             return ErrorResponse.createMono("Missing required parameter in body", HttpStatus.BAD_REQUEST);
 239         }
 240         String jsonString = gson.toJson(policyInfo.policyData);
 241         Ric ric = rics.get(policyInfo.ricId);
 242         PolicyType type = policyTypes.get(policyInfo.policyTypeId);
 243         keepServiceAlive(policyInfo.serviceId);
 244         if (ric == null || type == null) {
 245             throw new EntityNotFoundException("Near-RT RIC or policy type not found");
 246         }
 247         Policy policy = Policy.builder() //
 248                 .id(policyInfo.policyId) //
 249                 .json(jsonString) //
 250                 .type(type) //
 251                 .ric(ric) //
 252                 .ownerServiceId(policyInfo.serviceId) //
 253                 .lastModified(Instant.now()) //
 254                 .isTransient(policyInfo.isTransient) //
 255                 .statusNotificationUri(policyInfo.statusNotificationUri == null ? "" : policyInfo.statusNotificationUri) //
 256                 .build();
 257
 258         return ric.getLock().lock(LockType.SHARED, "putPolicy") //
 259                 .flatMap(grant -> putPolicy(grant, policy));
 260     }
 261
 262     private Mono<ResponseEntity<Object>> putPolicy(Lock.Grant grant, Policy policy) {
 263         final boolean isCreate = this.policies.get(policy.getId()) == null;
 264         final Ric ric = policy.getRic();
 265
 266         return assertRicStateIdle(ric) //
 267                 .flatMap(notUsed -> checkSupportedType(ric, policy.getType())) //
 268                 .flatMap(notUsed -> validateModifiedPolicy(policy)) //
 269                 .flatMap(notUsed -> a1ClientFactory.createA1Client(ric)) //
 270                 .flatMap(client -> client.putPolicy(policy)) //
 271                 .doOnNext(notUsed -> policies.put(policy)) //
 272                 .doFinally(x -> grant.unlockBlocking()) //
 273                 .flatMap(notUsed -> Mono.just(new ResponseEntity<>(isCreate ? HttpStatus.CREATED : HttpStatus.OK))) //
 274                 .onErrorResume(this::handleException);
 275
 276     }
 277
 278     private Mono<ResponseEntity<Object>> handleException(Throwable throwable) {
 279         if (throwable instanceof WebClientResponseException) {
 280             WebClientResponseException e = (WebClientResponseException) throwable;
 281             return ErrorResponse.createMono(e.getResponseBodyAsString(), e.getStatusCode());
 282         } else if (throwable instanceof WebClientException) {
 283             WebClientException e = (WebClientException) throwable;
 284             return ErrorResponse.createMono(e.getMessage(), HttpStatus.BAD_GATEWAY);
 285         } else if (throwable instanceof RejectionException) {
 286             RejectionException e = (RejectionException) throwable;
 287             return ErrorResponse.createMono(e.getMessage(), e.getStatus());
 288         } else {
 289             return ErrorResponse.createMono(throwable.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
 290         }
 291     }
 292
 293     private Mono<Object> validateModifiedPolicy(Policy policy) {
 294         // Check that ric is not updated
 295         Policy current = this.policies.get(policy.getId());
 296         if (current != null && !current.getRic().id().equals(policy.getRic().id())) {
 297             RejectionException e = new RejectionException("Policy cannot change RIC, policyId: " + current.getId() + //
 298                     ", RIC ID: " + current.getRic().id() + //
 299                     ", new ID: " + policy.getRic().id(), HttpStatus.CONFLICT);
 300             logger.debug("Request rejected, {}", e.getMessage());
 301             return Mono.error(e);
 302         }
 303         return Mono.just("{}");
 304     }
 305
 306     private Mono<Object> checkSupportedType(Ric ric, PolicyType type) {
 307         if (!ric.isSupportingType(type.getId())) {
 308             logger.debug("Request rejected, type not supported, RIC: {}", ric);
 309             RejectionException e = new RejectionException(
 310                     "Type: " + type.getId() + " not supported by RIC: " + ric.id(), HttpStatus.NOT_FOUND);
 311             return Mono.error(e);
 312         }
 313         return Mono.just("{}");
 314     }
 315
 316     private Mono<Object> assertRicStateIdle(Ric ric) {
 317         if (ric.getState() == Ric.RicState.AVAILABLE) {
 318             return Mono.just("{}");
 319         } else {
 320             logger.debug("Request rejected Near-RT RIC not IDLE, ric: {}", ric);
 321             RejectionException e = new RejectionException(
 322                     "Near-RT RIC: is not operational, id: " + ric.id() + ", state: " + ric.getState(),
 323                     HttpStatus.LOCKED);
 324             return Mono.error(e);
 325         }
 326     }
 327
 328     static final String GET_POLICIES_QUERY_DETAILS =
 329             "Returns a list of A1 policies matching given search criteria. <br>" //
 330                     + "If several query parameters are defined, the policies matching all conditions are returned.";
 331
 332     @GetMapping(path = Consts.V2_API_ROOT + "/policy-instances", produces = MediaType.APPLICATION_JSON_VALUE)
 333     @Operation(summary = "Query for A1 policy instances", description = GET_POLICIES_QUERY_DETAILS)
 334     @ApiResponses(value = { //
 335             @ApiResponse(responseCode = "200", //
 336                     description = "Policies", //
 337                     content = @Content(schema = @Schema(implementation = PolicyInfoList.class))), //
 338             @ApiResponse(responseCode = "404", //
 339                     description = "Near-RT RIC, policy type or service not found", //
 340                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))) //
 341     })
 342     public ResponseEntity<Object> getPolicyInstances( //
 343             @Parameter(name = Consts.POLICY_TYPE_ID_PARAM, required = false,
 344                     description = "Select policies with a given type identity.") //
 345             @RequestParam(name = Consts.POLICY_TYPE_ID_PARAM, required = false) String typeId, //
 346             @Parameter(name = Consts.RIC_ID_PARAM, required = false,
 347                     description = "Select policies for a given Near-RT RIC identity.") //
 348             @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ric, //
 349             @Parameter(name = Consts.SERVICE_ID_PARAM, required = false,
 350                     description = "Select policies owned by a given service.") //
 351             @RequestParam(name = Consts.SERVICE_ID_PARAM, required = false) String service,
 352             @Parameter(name = Consts.TYPE_NAME_PARAM, required = false, //
 353                     description = "Select policies of a given type name (type identity has the format <typename_version>)") //
 354             @RequestParam(name = Consts.TYPE_NAME_PARAM, required = false) String typeName)
 355             throws EntityNotFoundException //
 356     {
 357         if ((typeId != null && this.policyTypes.get(typeId) == null)) {
 358             throw new EntityNotFoundException("Policy type identity not found");
 359         }
 360         if ((ric != null && this.rics.get(ric) == null)) {
 361             throw new EntityNotFoundException("Near-RT RIC not found");
 362         }
 363
 364         String filteredPolicies = policiesToJson(policies.filterPolicies(typeId, ric, service, typeName));
 365         return new ResponseEntity<>(filteredPolicies, HttpStatus.OK);
 366     }
 367
 368     @GetMapping(path = Consts.V2_API_ROOT + "/policies", produces = MediaType.APPLICATION_JSON_VALUE) //
 369     @Operation(summary = "Query policy identities", description = GET_POLICIES_QUERY_DETAILS) //
 370     @ApiResponses(value = { //
 371             @ApiResponse(responseCode = "200", //
 372                     description = "Policy identities", //
 373                     content = @Content(schema = @Schema(implementation = PolicyIdList.class))), //
 374             @ApiResponse(responseCode = "404", //
 375                     description = "Near-RT RIC or type not found", //
 376                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))) //
 377     })
 378     public ResponseEntity<Object> getPolicyIds( //
 379             @Parameter(name = Consts.POLICY_TYPE_ID_PARAM, required = false, //
 380                     description = "Select policies of a given policy type identity.") //
 381             @RequestParam(name = Consts.POLICY_TYPE_ID_PARAM, required = false) String policyTypeId, //
 382             @Parameter(name = Consts.RIC_ID_PARAM, required = false, //
 383                     description = "Select policies of a given Near-RT RIC identity.") //
 384             @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ricId, //
 385             @Parameter(name = Consts.SERVICE_ID_PARAM, required = false, //
 386                     description = "Select policies owned by a given service.") //
 387             @RequestParam(name = Consts.SERVICE_ID_PARAM, required = false) String serviceId,
 388             @Parameter(name = Consts.TYPE_NAME_PARAM, required = false, //
 389                     description = "Select policies of types with the given type name (type identity has the format <typename_version>)") //
 390             @RequestParam(name = Consts.TYPE_NAME_PARAM, required = false) String typeName)
 391             throws EntityNotFoundException //
 392     {
 393         if ((policyTypeId != null && this.policyTypes.get(policyTypeId) == null)) {
 394             throw new EntityNotFoundException("Policy type not found");
 395         }
 396         if ((ricId != null && this.rics.get(ricId) == null)) {
 397             throw new EntityNotFoundException("Near-RT RIC not found");
 398         }
 399
 400         String policyIdsJson = toPolicyIdsJson(policies.filterPolicies(policyTypeId, ricId, serviceId, typeName));
 401         return new ResponseEntity<>(policyIdsJson, HttpStatus.OK);
 402     }
 403
 404     @GetMapping(path = Consts.V2_API_ROOT + "/policies/{policy_id}/status", produces = MediaType.APPLICATION_JSON_VALUE)
 405     @Operation(summary = "Returns a policy status") //
 406     @ApiResponses(value = { //
 407             @ApiResponse(responseCode = "200", //
 408                     description = "Policy status", //
 409                     content = @Content(schema = @Schema(implementation = PolicyStatusInfo.class))), //
 410             @ApiResponse(responseCode = "404", //
 411                     description = "Policy is not found", //
 412                     content = @Content(schema = @Schema(implementation = ErrorResponse.ErrorInfo.class))) //
 413     })
 414     public Mono<ResponseEntity<Object>> getPolicyStatus( //
 415             @PathVariable(Consts.POLICY_ID_PARAM) String policyId) throws EntityNotFoundException {
 416         Policy policy = policies.getPolicy(policyId);
 417
 418         return a1ClientFactory.createA1Client(policy.getRic()) //
 419                 .flatMap(client -> client.getPolicyStatus(policy).onErrorResume(e -> Mono.just("{}"))) //
 420                 .flatMap(status -> createPolicyStatus(policy, status)) //
 421                 .onErrorResume(this::handleException);
 422
 423     }
 424
 425     private Mono<ResponseEntity<Object>> createPolicyStatus(Policy policy, String statusFromNearRic) {
 426         PolicyStatusInfo info = new PolicyStatusInfo(policy.getLastModified(), fromJson(statusFromNearRic));
 427         String str = gson.toJson(info);
 428         return Mono.just(new ResponseEntity<>(str, HttpStatus.OK));
 429     }
 430
 431     private void keepServiceAlive(String name) {
 432         Service s = this.services.get(name);
 433         if (s != null) {
 434             s.keepAlive();
 435         }
 436     }
 437
 438     private PolicyInfo toPolicyInfo(Policy p) {
 439         PolicyInfo policyInfo = new PolicyInfo();
 440         policyInfo.policyId = p.getId();
 441         policyInfo.policyData = fromJson(p.getJson());
 442         policyInfo.ricId = p.getRic().id();
 443         policyInfo.policyTypeId = p.getType().getId();
 444         policyInfo.serviceId = p.getOwnerServiceId();
 445         policyInfo.isTransient = p.isTransient();
 446         if (!p.getStatusNotificationUri().isEmpty()) {
 447             policyInfo.statusNotificationUri = p.getStatusNotificationUri();
 448         }
 449         if (!policyInfo.validate()) {
 450             logger.error("BUG, all mandatory fields must be set");
 451         }
 452
 453         return policyInfo;
 454     }
 455
 456     private String policiesToJson(Collection<Policy> policies) {
 457         List<PolicyInfo> v = new ArrayList<>(policies.size());
 458         for (Policy p : policies) {
 459             v.add(toPolicyInfo(p));
 460         }
 461         PolicyInfoList list = new PolicyInfoList(v);
 462         return gson.toJson(list);
 463     }
 464
 465     private Object fromJson(String jsonStr) {
 466         return gson.fromJson(jsonStr, Object.class);
 467     }
 468
 469     private String toPolicyTypeIdsJson(Collection<PolicyType> types) {
 470         List<String> v = new ArrayList<>(types.size());
 471         for (PolicyType t : types) {
 472             v.add(t.getId());
 473         }
 474         PolicyTypeIdList ids = new PolicyTypeIdList(v);
 475         return gson.toJson(ids);
 476     }
 477
 478     private String toPolicyIdsJson(Collection<Policy> policies) {
 479         List<String> v = new ArrayList<>(policies.size());
 480         for (Policy p : policies) {
 481             v.add(p.getId());
 482         }
 483         return gson.toJson(new PolicyIdList(v));
 484     }
 485
 486 }