diff options
Diffstat (limited to 'src/main/java/org/openecomp/sdc/tosca/parser/impl/SdcCsarHelperImpl.java')
| -rw-r--r-- | src/main/java/org/openecomp/sdc/tosca/parser/impl/SdcCsarHelperImpl.java | 620 |
1 files changed, 620 insertions, 0 deletions
diff --git a/src/main/java/org/openecomp/sdc/tosca/parser/impl/SdcCsarHelperImpl.java b/src/main/java/org/openecomp/sdc/tosca/parser/impl/SdcCsarHelperImpl.java new file mode 100644 index 0000000..612b896 --- /dev/null +++ b/src/main/java/org/openecomp/sdc/tosca/parser/impl/SdcCsarHelperImpl.java @@ -0,0 +1,620 @@ +/*- + * ============LICENSE_START======================================================= + * sdc-distribution-client + * ================================================================================ + * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * ============LICENSE_END========================================================= + */ + +package org.openecomp.sdc.tosca.parser.impl; + +import java.util.*; +import java.util.Map.Entry; +import java.util.regex.Matcher; +import java.util.regex.Pattern; +import java.util.stream.Collectors; + +import org.apache.commons.lang3.StringUtils; +import org.apache.commons.lang3.tuple.ImmutablePair; +import org.apache.commons.lang3.tuple.Pair; +//import org.json.JSONObject; +import org.openecomp.sdc.tosca.parser.api.ISdcCsarHelper; +import org.openecomp.sdc.tosca.parser.utils.GeneralUtility; +import org.openecomp.sdc.tosca.parser.utils.SdcToscaUtility; +import org.openecomp.sdc.toscaparser.api.Group; +import org.openecomp.sdc.toscaparser.api.NodeTemplate; +import org.openecomp.sdc.toscaparser.api.Property; +import org.openecomp.sdc.toscaparser.api.SubstitutionMappings; +import org.openecomp.sdc.toscaparser.api.TopologyTemplate; +import org.openecomp.sdc.toscaparser.api.ToscaTemplate; +import org.openecomp.sdc.toscaparser.api.elements.Metadata; +import org.openecomp.sdc.toscaparser.api.elements.NodeType; +import org.openecomp.sdc.toscaparser.api.functions.Function; +import org.openecomp.sdc.toscaparser.api.parameters.Input; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import static org.openecomp.sdc.tosca.parser.impl.SdcPropertyNames.PROPERTY_NAME_CUSTOMIZATIONUUID; + +public class SdcCsarHelperImpl implements ISdcCsarHelper { + + private static final String PATH_DELIMITER = "#"; + private static final String PREFIX = "port_"; + private static final String CUSTOMIZATION_UUID = "customizationUUID"; + private static Pattern SUFFIX = Pattern.compile("(_network_role_tag|_ip_requirements|_subnetpoolid)$"); + private ToscaTemplate toscaTemplate; + private static Logger log = LoggerFactory.getLogger(SdcCsarHelperImpl.class.getName()); + + public SdcCsarHelperImpl(ToscaTemplate toscaTemplate) { + this.toscaTemplate = toscaTemplate; + } + + @Override + //Sunny flow - covered with UT, flat and nested + public String getNodeTemplatePropertyLeafValue(NodeTemplate nodeTemplate, String leafValuePath) { + if (nodeTemplate == null) { + log.error("getNodeTemplatePropertyLeafValue - nodeTemplate is null"); + return null; + } + if (GeneralUtility.isEmptyString(leafValuePath)) { + log.error("getNodeTemplatePropertyLeafValue - leafValuePath is null or empty"); + return null; + } + String[] split = getSplittedPath(leafValuePath); + LinkedHashMap<String, Property> properties = nodeTemplate.getProperties(); + Object property = processProperties(split, properties); + return property == null || property instanceof Function ? null : String.valueOf(property); + } + + @Override + public Object getNodeTemplatePropertyAsObject(NodeTemplate nodeTemplate, String leafValuePath) { + if (nodeTemplate == null) { + log.error("getNodeTemplatePropertyAsObject - nodeTemplate is null"); + return null; + } + if (GeneralUtility.isEmptyString(leafValuePath)) { + log.error("getNodeTemplatePropertyAsObject - leafValuePath is null or empty"); + return null; + } + String[] split = getSplittedPath(leafValuePath); + LinkedHashMap<String, Property> properties = nodeTemplate.getProperties(); + return processProperties(split, properties); + } + + public Map<String, Map<String, Object>> getCpPropertiesFromVfc(NodeTemplate vfc) { + + if (vfc == null) { + log.error("getCpPropertiesFromVfc - vfc is null"); + return new HashMap<>(); + } + + List<String> paths = new ArrayList<>(); + paths.add("network_role_tag"); + paths.add("ip_requirements#ip_count_required#count"); + paths.add("ip_requirements#dhcp_enabled"); + paths.add("ip_requirements#ip_version"); + paths.add("subnetpoolid"); + + Map<String, Property> props = vfc.getProperties(); + + Map<String, Map<String, Object>> cps = new HashMap<>(); + + if (props != null) { + for (Map.Entry<String, Property> entry : props.entrySet()) { + String fullCpName = entry.getKey(); + Matcher matcher = SUFFIX.matcher(fullCpName); + + if (fullCpName.startsWith(PREFIX) && matcher.find()) { + //this is CP - get all it's properties according to paths list + String cpName = fullCpName.replaceAll("^(" + PREFIX + ")", "").replaceAll(matcher.group(1), ""); + + List<String> propertiesToSearch = paths.stream().filter(i -> i.contains(StringUtils.stripStart(matcher.group(1), "_"))).collect(Collectors.toList()); + for (String item : propertiesToSearch) { + String fullPathToSearch = PREFIX + cpName + "_" + item; + Object value = getNodeTemplatePropertyAsObject(vfc, fullPathToSearch); + if (value != null) { + if (!cps.containsKey(cpName)){ + cps.put(cpName, new HashMap<>()); + } + cps.get(cpName).put(item, value); + } + + } + } + } + } + + return cps; + } + + @Override + //Sunny flow - covered with UT + public List<NodeTemplate> getServiceVlList() { + List<NodeTemplate> serviceVlList = getNodeTemplateBySdcType(toscaTemplate.getTopologyTemplate(), Types.TYPE_VL); + return serviceVlList; + } + + @Override + //Sunny flow - covered with UT + public List<NodeTemplate> getServiceVfList() { + List<NodeTemplate> serviceVfList = getNodeTemplateBySdcType(toscaTemplate.getTopologyTemplate(), Types.TYPE_VF); + return serviceVfList; + } + + @Override + //Sunny flow - covered with UT + public String getMetadataPropertyValue(Metadata metadata, String metadataPropertyName) { + if (GeneralUtility.isEmptyString(metadataPropertyName)) { + log.error("getMetadataPropertyValue - the metadataPropertyName is null or empty"); + return null; + } + if (metadata == null) { + log.error("getMetadataPropertyValue - the metadata is null"); + return null; + } + String metadataPropertyValue = metadata.getValue(metadataPropertyName); + return metadataPropertyValue; + } + + + @Override + //Sunny flow - covered with UT + public List<NodeTemplate> getServiceNodeTemplatesByType(String nodeType) { + if (GeneralUtility.isEmptyString(nodeType)) { + log.error("getServiceNodeTemplatesByType - nodeType - is null or empty"); + return new ArrayList<>(); + } + + List<NodeTemplate> res = new ArrayList<>(); + List<NodeTemplate> nodeTemplates = toscaTemplate.getNodeTemplates(); + for (NodeTemplate nodeTemplate : nodeTemplates) { + if (nodeType.equals(nodeTemplate.getTypeDefinition().getType())) { + res.add(nodeTemplate); + } + } + + return res; + } + + + @Override + public List<NodeTemplate> getServiceNodeTemplates() { + List<NodeTemplate> nodeTemplates = toscaTemplate.getNodeTemplates(); + return nodeTemplates; + } + + @Override + //Sunny flow - covered with UT + public List<NodeTemplate> getVfcListByVf(String vfCustomizationId) { + if (GeneralUtility.isEmptyString(vfCustomizationId)) { + log.error("getVfcListByVf - vfCustomizationId - is null or empty"); + return new ArrayList<>(); + } + + List<NodeTemplate> serviceVfList = getServiceVfList(); + NodeTemplate vfInstance = getNodeTemplateByCustomizationUuid(serviceVfList, vfCustomizationId); + return getNodeTemplateBySdcType(vfInstance, Types.TYPE_VFC); + } + + @Override + //Sunny flow - covered with UT + public List<Group> getVfModulesByVf(String vfCustomizationUuid) { + List<NodeTemplate> serviceVfList = getServiceVfList(); + NodeTemplate nodeTemplateByCustomizationUuid = getNodeTemplateByCustomizationUuid(serviceVfList, vfCustomizationUuid); + if (nodeTemplateByCustomizationUuid != null) { + /*SubstitutionMappings substitutionMappings = nodeTemplateByCustomizationUuid.getSubstitutionMappings(); + if (substitutionMappings != null){ + List<Group> groups = substitutionMappings.getGroups(); + if (groups != null){ + List<Group> collect = groups.stream().filter(x -> "org.openecomp.groups.VfModule".equals(x.getTypeDefinition().getType())).collect(Collectors.toList()); + log.debug("getVfModulesByVf - VfModules are {}", collect); + return collect; + } + }*/ + String name = nodeTemplateByCustomizationUuid.getName(); + String normaliseComponentInstanceName = SdcToscaUtility.normaliseComponentInstanceName(name); + List<Group> serviceLevelGroups = toscaTemplate.getTopologyTemplate().getGroups(); + log.debug("getVfModulesByVf - VF node template name {}, normalized name {}. Searching groups on service level starting with VF normalized name...", name, normaliseComponentInstanceName); + if (serviceLevelGroups != null) { + List<Group> collect = serviceLevelGroups + .stream() + .filter(x -> "org.openecomp.groups.VfModule".equals(x.getTypeDefinition().getType()) && x.getName().startsWith(normaliseComponentInstanceName)) + .collect(Collectors.toList()); + return collect; + } + } + return new ArrayList<>(); + } + + @Override + //Sunny flow - covered with UT + public String getServiceInputLeafValueOfDefault(String inputLeafValuePath) { + if (GeneralUtility.isEmptyString(inputLeafValuePath)) { + log.error("getServiceInputLeafValueOfDefault - inputLeafValuePath is null or empty"); + return null; + } + + String[] split = getSplittedPath(inputLeafValuePath); + if (split.length < 2 || !split[1].equals("default")) { + log.error("getServiceInputLeafValue - inputLeafValuePath should be of format <input name>#default[optionally #<rest of path>] "); + return null; + } + + List<Input> inputs = toscaTemplate.getInputs(); + if (inputs != null) { + Optional<Input> findFirst = inputs.stream().filter(x -> x.getName().equals(split[0])).findFirst(); + if (findFirst.isPresent()) { + Input input = findFirst.get(); + Object current = input.getDefault(); + Object property = iterateProcessPath(2, current, split); + return property == null || property instanceof Function? null : String.valueOf(property); + } + } + log.error("getServiceInputLeafValue - value not found"); + return null; + } + + @Override + public Object getServiceInputLeafValueOfDefaultAsObject(String inputLeafValuePath) { + if (GeneralUtility.isEmptyString(inputLeafValuePath)) { + log.error("getServiceInputLeafValueOfDefaultAsObject - inputLeafValuePath is null or empty"); + return null; + } + + String[] split = getSplittedPath(inputLeafValuePath); + if (split.length < 2 || !split[1].equals("default")) { + log.error("getServiceInputLeafValueOfDefaultAsObject - inputLeafValuePath should be of format <input name>#default[optionally #<rest of path>] "); + return null; + } + + List<Input> inputs = toscaTemplate.getInputs(); + if (inputs != null) { + Optional<Input> findFirst = inputs.stream().filter(x -> x.getName().equals(split[0])).findFirst(); + if (findFirst.isPresent()) { + Input input = findFirst.get(); + Object current = input.getDefault(); + return iterateProcessPath(2, current, split); + } + } + log.error("getServiceInputLeafValueOfDefaultAsObject - value not found"); + return null; + } + + private Object iterateProcessPath(Integer index, Object current, String[] split) { + if (current == null) { + log.error("iterateProcessPath - this input has no default"); + return null; + } + if (split.length > index) { + for (int i = index; i < split.length; i++) { + if (current instanceof Map) { + current = ((Map<String, Object>) current).get(split[i]); + } else if (current instanceof List) { + current = ((List) current).get(0); + i--; + } + else { + log.error("iterateProcessPath - found an unexpected leaf where expected to find a complex type"); + return null; + } + } + } + if (current != null) { + return current; + } + log.error("iterateProcessPath - Path not Found"); + return null; + } + + private String[] getSplittedPath(String inputLeafValuePath) { + return inputLeafValuePath.split(PATH_DELIMITER); + } + + + @Override + //Sunny flow - covered with UT + public String getServiceSubstitutionMappingsTypeName() { + SubstitutionMappings substitutionMappings = toscaTemplate.getTopologyTemplate().getSubstitutionMappings(); + if (substitutionMappings == null) { + log.debug("getServiceSubstitutionMappingsTypeName - No Substitution Mappings defined"); + return null; + } + + NodeType nodeType = substitutionMappings.getNodeDefinition(); + if (nodeType == null) { + log.debug("getServiceSubstitutionMappingsTypeName - No Substitution Mappings node defined"); + return null; + } + + return nodeType.getType(); + } + + @Override + //Sunny flow - covered with UT + public Metadata getServiceMetadata() { + return toscaTemplate.getMetaData(); + } + + @Override + //Sunny flow - covered with UT + public Map<String, Object> getServiceMetadataProperties() { + if (toscaTemplate.getMetaData()==null){ + return null; + } + return toscaTemplate.getMetaData().getPropertyMap(); + } + + @Override + //Sunny flow - covered with UT + public List<Input> getServiceInputs() { + return toscaTemplate.getInputs(); + } + + @Override + //Sunny flow - covered with UT + public String getGroupPropertyLeafValue(Group group, String leafValuePath) { + if (group == null) { + log.error("getGroupPropertyLeafValue - group is null"); + return null; + } + + if (GeneralUtility.isEmptyString(leafValuePath)) { + log.error("getGroupPropertyLeafValue - leafValuePath is null or empty"); + return null; + } + + String[] split = getSplittedPath(leafValuePath); + LinkedHashMap<String, Property> properties = group.getProperties(); + Object property = processProperties(split, properties); + return property == null || property instanceof Function? null : String.valueOf(property); + } + + @Override + public Object getGroupPropertyAsObject(Group group, String leafValuePath) { + if (group == null) { + log.error("getGroupPropertyAsObject - group is null"); + return null; + } + + if (GeneralUtility.isEmptyString(leafValuePath)) { + log.error("getGroupPropertyAsObject - leafValuePath is null or empty"); + return null; + } + + String[] split = getSplittedPath(leafValuePath); + LinkedHashMap<String, Property> properties = group.getProperties(); + return processProperties(split, properties); + } + + @Override + //Sunny flow - covered with UT + public List<NodeTemplate> getCpListByVf(String vfCustomizationId) { + List<NodeTemplate> cpList = new ArrayList<>(); + if (GeneralUtility.isEmptyString(vfCustomizationId)) { + log.error("getCpListByVf vfCustomizationId string is empty"); + return cpList; + } + + List<NodeTemplate> serviceVfList = getServiceVfList(); + if (serviceVfList == null || serviceVfList.size() == 0) { + log.error("getCpListByVf Vfs not exist for vfCustomizationId {}", vfCustomizationId); + return cpList; + } + NodeTemplate vfInstance = getNodeTemplateByCustomizationUuid(serviceVfList, vfCustomizationId); + if (vfInstance == null) { + log.debug("getCpListByVf vf list is null"); + return cpList; + } + cpList = getNodeTemplateBySdcType(vfInstance, Types.TYPE_CP); + if (cpList == null || cpList.size() == 0) + log.debug("getCpListByVf cps not exist for vfCustomizationId {}", vfCustomizationId); + return cpList; + } + + @Override + //Sunny flow - covered with UT + public List<NodeTemplate> getMembersOfVfModule(NodeTemplate vf, Group serviceLevelVfModule) { + if (vf == null) { + log.error("getMembersOfVfModule - vf is null"); + return new ArrayList<>(); + } + + if (serviceLevelVfModule == null || serviceLevelVfModule.getMetadata() == null || serviceLevelVfModule.getMetadata().getValue(SdcPropertyNames.PROPERTY_NAME_VFMODULEMODELINVARIANTUUID) == null) { + log.error("getMembersOfVfModule - vfModule or its metadata is null. Cannot match a VF group based on invariantUuid from missing metadata."); + return new ArrayList<>(); + } + + + SubstitutionMappings substitutionMappings = vf.getSubMappingToscaTemplate(); + if (substitutionMappings != null) { + List<Group> groups = substitutionMappings.getGroups(); + if (groups != null) { + Optional<Group> findFirst = groups + .stream() + .filter(x -> (x.getMetadata() != null && serviceLevelVfModule.getMetadata().getValue(SdcPropertyNames.PROPERTY_NAME_VFMODULEMODELINVARIANTUUID).equals(x.getMetadata().getValue(SdcPropertyNames.PROPERTY_NAME_VFMODULEMODELINVARIANTUUID)))).findFirst(); + if (findFirst.isPresent()) { + List<String> members = findFirst.get().getMembers(); + if (members != null) { + List<NodeTemplate> collect = substitutionMappings.getNodeTemplates().stream().filter(x -> members.contains(x.getName())).collect(Collectors.toList()); + return collect; + } + } + } + } + return new ArrayList<>(); + } + + @Override + //Sunny flow - covered with UT + public List<Pair<NodeTemplate, NodeTemplate>> getNodeTemplatePairsByReqName( + List<NodeTemplate> listOfReqNodeTemplates, List<NodeTemplate> listOfCapNodeTemplates, String reqName) { + if (listOfReqNodeTemplates == null || listOfCapNodeTemplates == null || reqName == null) { + //TODO error message + return new ArrayList<>(); + } + + List<Pair<NodeTemplate, NodeTemplate>> pairsList = new ArrayList<>(); + + if (listOfReqNodeTemplates != null) { + for (NodeTemplate reqNodeTemplate : listOfReqNodeTemplates) { + List<Object> requirements = reqNodeTemplate.getRequirements(); + for (Object reqEntry : requirements) { + LinkedHashMap<String, Object> reqEntryHash = (LinkedHashMap<String, Object>) reqEntry; + Map<String, Object> reqEntryMap = (Map<String, Object>) reqEntryHash.get(reqName); + if (reqEntryMap != null) { + Object node = reqEntryMap.get("node"); + if (node != null) { + String nodeString = (String) node; + Optional<NodeTemplate> findFirst = listOfCapNodeTemplates.stream().filter(x -> x.getName().equals(nodeString)).findFirst(); + if (findFirst.isPresent()) { + pairsList.add(new ImmutablePair<NodeTemplate, NodeTemplate>(reqNodeTemplate, findFirst.get())); + } + } + } + } + } + } + return pairsList; + } + + @Override + //Sunny flow - covered with UT + //TODO constant strings + public List<NodeTemplate> getAllottedResources() { + List<NodeTemplate> nodeTemplates = null; + nodeTemplates = toscaTemplate.getTopologyTemplate().getNodeTemplates(); + if (nodeTemplates.isEmpty()) { + log.error("getAllottedResources nodeTemplates not exist"); + } + nodeTemplates = nodeTemplates.stream().filter( + x -> x.getMetaData() != null && x.getMetaData().getValue("category").equals("Allotted Resource")) + .collect(Collectors.toList()); + if (nodeTemplates.isEmpty()) { + log.debug("getAllottedResources - allotted resources not exist"); + } else { + } + + return nodeTemplates; + } + + @Override + //Sunny flow - covered with UT + public String getTypeOfNodeTemplate(NodeTemplate nodeTemplate) { + if (nodeTemplate == null) { + + log.error("getTypeOfNodeTemplate nodeTemplate is null"); + return null; + } + return nodeTemplate.getTypeDefinition().getType(); + } + + @Override + public String getConformanceLevel() { + LinkedHashMap<String, Object> csarMeta = toscaTemplate.getMetaProperties("csar.meta"); + if (csarMeta == null){ + log.warn("No csar.meta file is found in CSAR - this file should hold the conformance level of the CSAR. This might be OK for older CSARs."); + return null; + } + + Object conformanceLevel = csarMeta.get("SDC-TOSCA-Definitions-Version"); + if (conformanceLevel != null){ + String confLevelStr = conformanceLevel.toString(); + log.debug("CSAR conformance level is {}", confLevelStr); + return confLevelStr; + } else { + log.error("Invalid csar.meta file - no entry found for SDC-TOSCA-Definitions-Version key. This entry should hold the conformance level."); + return null; + } + } + + + @Override + public String getNodeTemplateCustomizationUuid(NodeTemplate nt) { + String res = null; + if (nt != null && nt.getMetaData() != null){ + res = nt.getMetaData().getValue(CUSTOMIZATION_UUID); + } else { + log.error("Node template or its metadata is null"); + } + return res; + } + + /************************************* helper functions ***********************************/ + private List<NodeTemplate> getNodeTemplateBySdcType(NodeTemplate nodeTemplate, String sdcType) { + if (nodeTemplate == null) { + log.error("getNodeTemplateBySdcType - nodeTemplate is null or empty"); + return new ArrayList<>(); + } + + if (GeneralUtility.isEmptyString(sdcType)) { + log.error("getNodeTemplateBySdcType - sdcType is null or empty"); + return new ArrayList<>(); + } + + SubstitutionMappings substitutionMappings = nodeTemplate.getSubMappingToscaTemplate(); + + if (substitutionMappings != null) { + List<NodeTemplate> nodeTemplates = substitutionMappings.getNodeTemplates(); + if (nodeTemplates != null && nodeTemplates.size() > 0) + return nodeTemplates.stream().filter(x -> (x.getMetaData() != null && sdcType.equals(x.getMetaData().getValue(SdcPropertyNames.PROPERTY_NAME_TYPE)))).collect(Collectors.toList()); + else + log.debug("getNodeTemplateBySdcType - SubstitutionMappings' node Templates not exist"); + } else + log.debug("getNodeTemplateBySdcType - SubstitutionMappings not exist"); + + return new ArrayList<>(); + } + + private List<NodeTemplate> getNodeTemplateBySdcType(TopologyTemplate topologyTemplate, String sdcType) { + if (GeneralUtility.isEmptyString(sdcType)) { + log.error("getNodeTemplateBySdcType - sdcType is null or empty"); + return new ArrayList<>(); + } + + if (topologyTemplate == null) { + log.error("getNodeTemplateBySdcType - topologyTemplate is null"); + return new ArrayList<>(); + } + + List<NodeTemplate> nodeTemplates = topologyTemplate.getNodeTemplates(); + + if (nodeTemplates != null && nodeTemplates.size() > 0) + return nodeTemplates.stream().filter(x -> (x.getMetaData() != null && sdcType.equals(x.getMetaData().getValue(SdcPropertyNames.PROPERTY_NAME_TYPE)))).collect(Collectors.toList()); + + log.debug("getNodeTemplateBySdcType - topologyTemplate's nodeTemplates not exist"); + return new ArrayList<>(); + } + + //Assumed to be unique property for the list + private NodeTemplate getNodeTemplateByCustomizationUuid(List<NodeTemplate> nodeTemplates, String customizationId) { + Optional<NodeTemplate> findFirst = nodeTemplates.stream().filter(x -> (x.getMetaData() != null && customizationId.equals(x.getMetaData().getValue(PROPERTY_NAME_CUSTOMIZATIONUUID)))).findFirst(); + return findFirst.isPresent() ? findFirst.get() : null; + } + + private Object processProperties(String[] split, LinkedHashMap<String, Property> properties) { + Optional<Entry<String, Property>> findFirst = properties.entrySet().stream().filter(x -> x.getKey().equals(split[0])).findFirst(); + if (findFirst.isPresent()) { + Property property = findFirst.get().getValue(); + Object current = property.getValue(); + return iterateProcessPath(1, current, split); + } + String propName = (split != null && split.length > 0 ? split[0] : null); + log.error("processProperties - property {} not found", propName); + return null; + } + + + +} |