I'll help implement the pending functionality for parsing, storing, and validating the XML data. Here's the comprehensive implementation: package com.cinfin.billing.edbquoteissueservice.service.impl; import java.io.ByteArrayInputStream; import java.io.File; import java.io.InputStream; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.StandardCopyOption; import java.util.List; import java.util.Map; import java.util.HashMap; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Service; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; import com.cinfin.billing.edbquoteissueservice.dao.PolicyIssuanceDao; import com.cinfin.billing.edbquoteissueservice.dao.SourceXmlDao; import com.cinfin.billing.edbquoteissueservice.entity.SourceXml; import com.cinfin.billing.edbquoteissueservice.model.Issuance; import com.cinfin.billing.edbquoteissueservice.model.PayableItem; import com.cinfin.billing.edbquoteissueservice.model.PolicyData; import com.cinfin.billing.edbquoteissueservice.service.PolicyIssuanceService; import com.cinfin.billing.edbquoteissueservice.utils.XmlContentHandler; import com.cinfin.billing.edbquoteissueservice.utils.XmlValidationHandler; import com.cinfin.billing.web.RestResponse; import com.cinfin.cbcommon.xml.SaxParser; import com.cinfin.cbcommon.xml.SaxXpathException; import jakarta.transaction.Transactional; @Service public class PolicyIssuanceServiceImpl implements PolicyIssuanceService { @Autowired private SourceXmlDao sourceXmlDao; @Autowired private PolicyIssuanceDao policyIssuanceDao; @Autowired private MainframeServiceImpl mainframeService; @Autowired private DirectBillScheduleService billingDataService; @Value("${edb.sourcesystems.issuancedatabase}") private String sourceSystems; @Value("${xml.storage.path}") private String xmlStoragePath; @Override @Transactional public RestResponse processSourceXML(String fileName) { String xmlContent = readXmlFile(fileName); PolicyData policyData = initialValidation(xmlContent); if (!processSourceSystem(policyData.getSourceSystem())) { throw new RuntimeException("Source system not configured for processing"); } Long policyId = getPolicyId(policyData); SourceXml sourceXml = processXmlData(xmlContent, policyId); storeXmlData(sourceXml); storeTransaction(xmlContent, policyData); validatePremiums(xmlContent); mainframeService.notifyProcessing(xmlContent); return billingDataService.retrieveSchedule(policyId); } private String readXmlFile(String fileName) { try { Path path = Paths.get(xmlStoragePath, fileName); return new String(Files.readAllBytes(path)); } catch (Exception e) { throw new RuntimeException("Error reading XML file", e); } } @Override public PolicyData initialValidation(String xmlContent) { try { SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser saxParser = factory.newSAXParser(); XmlValidationHandler handler = new XmlValidationHandler(); InputStream is = new ByteArrayInputStream(xmlContent.getBytes(StandardCharsets.UTF_8)); saxParser.parse(is, handler); return handler.getPolicyData(); } catch (Exception e) { throw new RuntimeException("XML validation failed", e); } } @Override public boolean processSourceSystem(String sourceSystem) { return sourceSystems.contains(sourceSystem); } @Override public Long getPolicyId(PolicyData policyData) { // Check if policy exists Long existingPolicyId = policyIssuanceDao.findPolicyId( policyData.getPolicyPrefix(), policyData.getPolicyNumber(), policyData.getPolicyEffDate(), policyData.getPolicyExpDate() ); if (existingPolicyId != null) { return existingPolicyId; } // Create new policy if needed if ("NBS".equals(policyData.getCycleBusinessPurpose()) || "RWL".equals(policyData.getCycleBusinessPurpose())) { return policyIssuanceDao.createNewPolicy(policyData); } throw new RuntimeException("Invalid business purpose for policy creation"); } @Override public void submitTransaction(InputStream inputStream) { try { String fileName = "transaction_" + System.currentTimeMillis() + ".xml"; Path destination = Paths.get(xmlStoragePath, fileName); Files.copy(inputStream, destination, StandardCopyOption.REPLACE_EXISTING); String xmlContent = new String(Files.readAllBytes(destination)); PolicyData policyData = initialValidation(xmlContent); Long policyId = getPolicyId(policyData); policyIssuanceDao.insertXmlSource(xmlContent, policyId, policyData.getSourceSystem()); } catch (Exception e) { throw new RuntimeException("Error submitting transaction", e); } } private SourceXml processXmlData(String xmlContent, Long policyId) { try { SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser saxParser = factory.newSAXParser(); XmlContentHandler handler = new XmlContentHandler(policyId); InputStream is = new ByteArrayInputStream(xmlContent.getBytes(StandardCharsets.UTF_8)); saxParser.parse(is, handler); return handler.getSourceXml(); } catch (Exception e) { throw new RuntimeException("Error Processing XML", e); } } private void storeXmlData(SourceXml sourceXml) { sourceXmlDao.save(sourceXml); } @Override public void storeTransaction(String xmlContent, PolicyData policyData) { try { SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser saxParser = factory.newSAXParser(); // Use appropriate content handler based on source system DefaultHandler handler; if ("CLD".equals(policyData.getSourceSystem()) || "BOND".equals(policyData.getSourceSystem())) { handler = new CldBondContentHandler(policyData); } else { handler = new CsuContentHandler(policyData); } InputStream is = new ByteArrayInputStream(xmlContent.getBytes(StandardCharsets.UTF_8)); saxParser.parse(is, handler); } catch (Exception e) { throw new RuntimeException("Error storing transaction data", e); } } private void validatePremiums(String xmlContent) { try { SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser saxParser = factory.newSAXParser(); PremiumValidationHandler handler = new PremiumValidationHandler(); InputStream is = new ByteArrayInputStream(xmlContent.getBytes(StandardCharsets.UTF_8)); saxParser.parse(is, handler); if (!handler.isValid()) { throw new RuntimeException("Premium validation failed: " + handler.getValidationErrors()); } } catch (Exception e) { throw new RuntimeException("Premium validation error", e); } } @Override public PayableItem payableItemLookup(Coverage coverage) { Map criteria = new HashMap<>(); criteria.put("state", coverage.getState()); criteria.put("premiumTypeCode", coverage.getPremiumTypeCode()); return policyIssuanceDao.findPayableItem(criteria); } @Override public void transmitToBillingSystem(Long policyId) { // Implementation depends on billing system type if (isMainframeBilling(policyId)) { mainframeService.transmitPolicy(policyId); } else { billingDataService.transmitPolicy(policyId); } } private boolean isMainframeBilling(Long policyId) { // Logic to determine billing system type return policyIssuanceDao.isMainframeBilling(policyId); } @Override public String createResponse(PolicyData policyData) { if ("CLD".equals(policyData.getSourceSystem()) || "BOND".equals(policyData.getSourceSystem())) { return billingDataService.getBillingResponse(policyData.getPolicyId()); } else { return generateCsuResponse(policyData.getPolicyId()); } } private String generateCsuResponse(Long policyId) { // Generate CSU-specific response with allocation tables List installments = policyIssuanceDao.getInstallments(policyId); // Format response XML with installment elements return formatInstallmentResponse(installments); } } package com.cinfin.billing.edbquoteissueservice.model; public class PolicyData { private String retry; private String cycleBusinessPurpose; private String transactionKey; private String sourceSystem; private String sourceSystemEnvironment; private String policyPrefix; private String policyNumber; private String policyEffDate; private String policyExpDate; // Getters and setters public String getRetry() { return retry; } public void setRetry(String retry) { this.retry = retry; } public String getCycleBusinessPurpose() { return cycleBusinessPurpose; } public void setCycleBusinessPurpose(String cycleBusinessPurpose) { this.cycleBusinessPurpose = cycleBusinessPurpose; } public String getTransactionKey() { return transactionKey; } public void setTransactionKey(String transactionKey) { this.transactionKey = transactionKey; } public String getSourceSystem() { return sourceSystem; } public void setSourceSystem(String sourceSystem) { this.sourceSystem = sourceSystem; } public String getSourceSystemEnvironment() { return sourceSystemEnvironment; } public void setSourceSystemEnvironment(String sourceSystemEnvironment) { this.sourceSystemEnvironment = sourceSystemEnvironment; } public String getPolicyPrefix() { return policyPrefix; } public void setPolicyPrefix(String policyPrefix) { this.policyPrefix = policyPrefix; } public String getPolicyNumber() { return policyNumber; } public void setPolicyNumber(String policyNumber) { this.policyNumber = policyNumber; } public String getPolicyEffDate() { return policyEffDate; } public void setPolicyEffDate(String policyEffDate) { this.policyEffDate = policyEffDate; } public String getPolicyExpDate() { return policyExpDate; } public void setPolicyExpDate(String policyExpDate) { this.policyExpDate = policyExpDate; } } package com.cinfin.billing.edbquoteissueservice.utils; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; import com.cinfin.billing.edbquoteissueservice.model.PolicyData; public class XmlValidationHandler extends DefaultHandler { private PolicyData policyData = new PolicyData(); private StringBuilder currentValue = new StringBuilder(); private boolean inRequestParams = false; @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { currentValue.setLength(0); if ("RequestParams".equals(qName)) { inRequestParams = true; } } @Override public void characters(char[] ch, int start, int length) throws SAXException { currentValue.append(ch, start, length); } @Override public void endElement(String uri, String localName, String qName) throws SAXException { if (inRequestParams) { switch (qName) { case "Retry": policyData.setRetry(currentValue.toString()); break; case "CycleBusinessPurpose": policyData.setCycleBusinessPurpose(currentValue.toString()); break; case "TransactionKey": policyData.setTransactionKey(currentValue.toString()); break; case "SourceSystem": policyData.setSourceSystem(currentValue.toString()); break; case "SourceSystemEnvironment": policyData.setSourceSystemEnvironment(currentValue.toString()); break; case "PolicyPrefix": policyData.setPolicyPrefix(currentValue.toString()); break; case "PolicyNumber": policyData.setPolicyNumber(currentValue.toString()); break; case "PolicyEffDate": policyData.setPolicyEffDate(currentValue.toString()); break; case "PolicyExpDate": policyData.setPolicyExpDate(currentValue.toString()); break; case "RequestParams": inRequestParams = false; break; } } } public PolicyData getPolicyData() { return policyData; } }