renamed project and added changes to optimise thymeleaf usage

pom.xml

@@ -10,7 +10,7 @@
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>com.rds.barcodegen</groupId>
-	<artifactId>barcode-generator</artifactId>
+	<artifactId>document-service</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
 	<name>barcode-generator</name>
 	<description>Code39 Barcode generator</description>

src/main/java/com/rds/barcodegen/api/rest/impl/DocumentResourceImpl.java

@@ -3,7 +3,7 @@
 import java.io.IOException;
 
 import com.rds.barcodegen.api.rest.DocumentResource;
-import com.rds.barcodegen.service.DocumentServiceApacheFOP;
+import com.rds.barcodegen.service.impl.BarcodeDocumentServiceImpl;
 import jakarta.servlet.ServletException;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
@@ -17,13 +17,13 @@
 @RestController
 @RequiredArgsConstructor
 public class DocumentResourceImpl implements DocumentResource {
-    private final DocumentServiceApacheFOP documentServiceApacheFOP;
+    private final BarcodeDocumentServiceImpl barcodeDocumentServiceImpl;
 
     @Override
     public void downloadFile(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
         response.setContentType(MediaType.APPLICATION_PDF_VALUE);
         response.setStatus(HttpStatus.OK.value());
         response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=Test.pdf");
-        documentServiceApacheFOP.generatePDF(request, response);
+        barcodeDocumentServiceImpl.generatePDF(request, response);
     }
 }

src/main/java/com/rds/barcodegen/config/ApplicationConfig.java

@@ -1,28 +1,31 @@
 package com.rds.barcodegen.config;
 
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
 import org.thymeleaf.TemplateEngine;
 import org.thymeleaf.spring6.SpringTemplateEngine;
-import org.thymeleaf.spring6.templateresolver.SpringResourceTemplateResolver;
 import org.thymeleaf.templatemode.TemplateMode;
+import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;
+import org.thymeleaf.templateresolver.ITemplateResolver;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 
 @Configuration
 public class ApplicationConfig {
     @Bean
-    public SpringResourceTemplateResolver templateResolver() {
-        SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
+    public ITemplateResolver foTemplateResolver() {
+        ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
         templateResolver.setTemplateMode(TemplateMode.XML);
-        templateResolver.setPrefix("classpath:/templates/");
+        templateResolver.setOrder(1);
+        templateResolver.setPrefix("/templates/");
         templateResolver.setSuffix(".fo");
         return templateResolver;
     }
 
     @Bean
     public TemplateEngine templateProcessorEngine() {
-        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
+        final SpringTemplateEngine templateEngine = new SpringTemplateEngine();
         templateEngine.setEnableSpringELCompiler(true);
-        templateEngine.setTemplateResolver(templateResolver());
+        templateEngine.setTemplateResolver(foTemplateResolver());
         return templateEngine;
     }
 }

src/main/java/com/rds/barcodegen/model/CustomerInfo.java

@@ -0,0 +1,16 @@
+package com.rds.barcodegen.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class CustomerInfo {
+    private String name;
+
+    private String id;
+
+    private String address;
+}

src/main/java/com/rds/barcodegen/model/Item.java

@@ -0,0 +1,16 @@
+package com.rds.barcodegen.model;
+
+import lombok.Data;
+
+@Data
+public class Item {
+    private String itemId;
+
+    private double quantity;
+
+    private String itemName;
+
+    private double perUnitPrice;
+
+    private double itemPrice;
+}

src/main/java/com/rds/barcodegen/model/OrderDetail.java

@@ -0,0 +1,21 @@
+package com.rds.barcodegen.model;
+
+import java.util.List;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class OrderDetail {
+    private CustomerInfo customerInfo;
+
+    private List<Item> items;
+
+    private double reductionPercentage;
+
+    private double totalAmount;
+    private double totalDiscount;
+}

src/main/java/com/rds/barcodegen/service/DocumentServiceApacheFOP.java → src/main/java/com/rds/barcodegen/service/AbstractDocumentService.java

@@ -5,8 +5,6 @@
 import java.io.StringReader;
 import java.net.URI;
 import java.net.URISyntaxException;
-import java.util.Locale;
-import java.util.Map;
 
 import javax.xml.transform.Result;
 import javax.xml.transform.Source;
@@ -16,47 +14,33 @@
 import javax.xml.transform.stream.StreamSource;
 
 import com.rds.barcodegen.exception.DocumentServiceException;
-import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.apache.commons.lang.RandomStringUtils;
 import org.apache.fop.apps.FopFactory;
-import org.apache.fop.apps.MimeConstants;
-import org.thymeleaf.TemplateEngine;
-import org.thymeleaf.context.Context;
+import org.apache.xmlgraphics.util.MimeConstants;
 import org.xml.sax.SAXException;
 import org.xml.sax.helpers.DefaultHandler;
 
 import org.springframework.core.io.ClassPathResource;
-import org.springframework.stereotype.Service;
 
 import static java.lang.Boolean.FALSE;
 import static net.sf.saxon.lib.FeatureKeys.ALLOWED_PROTOCOLS;
 import static net.sf.saxon.lib.FeatureKeys.ALLOW_EXTERNAL_FUNCTIONS;
 import static net.sf.saxon.lib.FeatureKeys.DTD_VALIDATION;
 
-@Slf4j
-@Service
-@RequiredArgsConstructor
-public class DocumentServiceApacheFOP {
-    private final TemplateEngine templateEngine;
+public abstract class AbstractDocumentService {
 
-    public void generatePDF(HttpServletRequest request, HttpServletResponse response) {
-        String data = RandomStringUtils.random(20, 0, 0, true, true, null).toUpperCase();
-        Context context = new Context(Locale.getDefault(), Map.of("model", Map.of(
-                "title", "BarCode Generation Using Apache FOP",
-                "titleLine1", "and Barcode4J",
-                "code39Message", data)));
-        String xmlTemplate = templateEngine.process("code39", context);
+    public static final String CONFIGURATION_XCONF = "configuration.xconf";
 
+    public static final String FACTORY_IMPL = "net.sf.saxon.TransformerFactoryImpl";
+
+    public void generateDocument(HttpServletResponse response, String xmlTemplate) {
         try {
-            InputStream inputStream = new ClassPathResource("configuration.xconf").getInputStream();
+            InputStream inputStream = new ClassPathResource(CONFIGURATION_XCONF).getInputStream();
             FopFactory fopFactory = FopFactory.newInstance(new URI("./"), inputStream);
             DefaultHandler defaultHandler = fopFactory.newFop(MimeConstants.MIME_PDF, response.getOutputStream()).getDefaultHandler();
             Source src = new StreamSource(new StringReader(xmlTemplate));
             Result result = new SAXResult(defaultHandler);
-            TransformerFactory transformerFactory = TransformerFactory.newInstance("net.sf.saxon.TransformerFactoryImpl", null);
+            TransformerFactory transformerFactory = TransformerFactory.newInstance(FACTORY_IMPL, null);
             transformerFactory.setFeature(DTD_VALIDATION, FALSE);
             transformerFactory.setFeature(ALLOW_EXTERNAL_FUNCTIONS, FALSE);
             transformerFactory.setAttribute(ALLOWED_PROTOCOLS, "");

src/main/java/com/rds/barcodegen/service/impl/BarcodeDocumentServiceImpl.java

@@ -0,0 +1,31 @@
+package com.rds.barcodegen.service.impl;
+
+import java.util.Locale;
+import java.util.Map;
+
+import com.rds.barcodegen.service.AbstractDocumentService;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang.RandomStringUtils;
+import org.thymeleaf.TemplateEngine;
+import org.thymeleaf.context.Context;
+
+import org.springframework.stereotype.Service;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class BarcodeDocumentServiceImpl extends AbstractDocumentService {
+    private final TemplateEngine templateEngine;
+
+    public void generatePDF(HttpServletRequest request, HttpServletResponse response) {
+        String data = RandomStringUtils.random(20, 0, 0, true, true, null).toUpperCase();
+        Context context = new Context(Locale.getDefault(), Map.of("model", Map.of(
+                "title", "BarCode Generation Using Apache FOP",
+                "titleLine1", "and Barcode4J",
+                "code39Message", data)));
+        generateDocument(response, templateEngine.process("code39", context));
+    }
+}