Category and Product pagination started...

Author: manirDev

src/main/java/com/manir/springbootecommercerestapi/controller/CategoryController.java

@@ -2,6 +2,7 @@
 
 import com.manir.springbootecommercerestapi.dto.CategoryDto;
 import com.manir.springbootecommercerestapi.service.CategoryService;
+import com.manir.springbootecommercerestapi.utils.Constant;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -26,8 +27,11 @@ public ResponseEntity<CategoryDto> createCategory(@RequestBody CategoryDto categ
 
     //get all categories api
     @GetMapping("/getAllCategory")
-    public List<CategoryDto> getAllCategory(){
-        List<CategoryDto> categoryDtoList = categoryService.getAllCategory();
+    public List<CategoryDto> getAllCategory(@RequestParam(value = "pageNo", defaultValue = Constant.DEFAULT_PAGE_NUMBER, required = false) int pageNo,
+                                            @RequestParam(value = "pageSize", defaultValue = Constant.DEFAULT_PAGE_SIZE, required = false) int pageSize,
+                                            @RequestParam(value = "sortBy", defaultValue = Constant.DEFAULT_SORT_BY, required = false) String sortBy,
+                                            @RequestParam(value = "sortDir", defaultValue = Constant.DEFAULT_SORT_DIRECTION, required = false) String sortDir){
+        List<CategoryDto> categoryDtoList = categoryService.getAllCategory(pageNo, pageSize, sortBy, sortDir);
         return categoryDtoList;
     }
 

src/main/java/com/manir/springbootecommercerestapi/controller/ProductController.java

@@ -2,14 +2,14 @@
 
 import com.manir.springbootecommercerestapi.dto.ProductDto;
 import com.manir.springbootecommercerestapi.service.ProductService;
+import com.manir.springbootecommercerestapi.utils.Constant;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
-import java.io.IOException;
 import java.util.List;
 
 @RestController
@@ -39,8 +39,11 @@ public ResponseEntity<ProductDto> saveProductByCategoryId(@PathVariable Long cat
 
     //get all products api
     @GetMapping("/getAllProduct")
-    public List<ProductDto> getAllProduct(){
-        List<ProductDto> responseProductDtoList = productService.getAllProduct();
+    public List<ProductDto> getAllProduct(@RequestParam(value = "pageNo", defaultValue = Constant.DEFAULT_PAGE_NUMBER, required = false) int pageNo,
+                                          @RequestParam(value = "pageSize", defaultValue = Constant.DEFAULT_PAGE_SIZE, required = false) int pageSize,
+                                          @RequestParam(value = "sortBy", defaultValue = Constant.DEFAULT_SORT_BY, required = false) String sortBy,
+                                          @RequestParam(value = "sortDir", defaultValue = Constant.DEFAULT_SORT_DIRECTION, required = false) String sortDir){
+        List<ProductDto> responseProductDtoList = productService.getAllProduct(pageNo, pageSize, sortBy, sortDir);
         return responseProductDtoList;
     }
 

src/main/java/com/manir/springbootecommercerestapi/service/CategoryService.java

@@ -7,7 +7,7 @@
 public interface CategoryService {
 
     CategoryDto createCategory(CategoryDto categoryDto);
-    List<CategoryDto> getAllCategory();
+    List<CategoryDto> getAllCategory(int pageNo, int pageSize, String sortBy, String sortDir);
     CategoryDto getCategoryById(Long categoryId);
     CategoryDto updateCategory(CategoryDto categoryDto, Long categoryId);
     void deleteCategory(Long categoryId);

src/main/java/com/manir/springbootecommercerestapi/service/Impl/CategoryServiceImpl.java

@@ -7,6 +7,10 @@
 import com.manir.springbootecommercerestapi.service.CategoryService;
 import org.hibernate.Session;
 import org.modelmapper.ModelMapper;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.Resource;
@@ -35,11 +39,14 @@ public CategoryDto createCategory(CategoryDto categoryDto) {
     }
 
     @Override
-    public List<CategoryDto> getAllCategory() {
+    public List<CategoryDto> getAllCategory(int pageNo, int pageSize, String sortBy, String sortDir) {
+        Sort sort = sortDir.equalsIgnoreCase(Sort.Direction.ASC.name()) ? Sort.by(sortBy).ascending() : Sort.by(sortBy).descending();
+        Pageable pageable = PageRequest.of(pageNo, pageSize, sort);
+        Page<Category> categories = categoryRepository.findAll(pageable);
 
-        List<Category> categories = categoryRepository.findAll();
+        List<Category> categoryList = categories.getContent();
         //map all categories to dto
-        List<CategoryDto> categoryDtoList = categories.stream()
+        List<CategoryDto> categoryDtoList = categoryList.stream()
                                                       .map(category -> mapToDto(category))
                                                       .collect(Collectors.toList());
 

src/main/java/com/manir/springbootecommercerestapi/service/Impl/ProductServiceImpl.java

@@ -8,6 +8,10 @@
 import com.manir.springbootecommercerestapi.model.Product;
 import com.manir.springbootecommercerestapi.service.ProductService;
 import org.modelmapper.ModelMapper;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.stereotype.Service;
 import org.springframework.util.StringUtils;
 import org.springframework.web.multipart.MultipartFile;
@@ -40,11 +44,16 @@ public ProductDto createProduct(ProductDto productDto, MultipartFile file) {
     }
 
     @Override
-    public List<ProductDto> getAllProduct() {
+    public List<ProductDto> getAllProduct(int pageNo, int pageSize, String sortBy, String sortDir) {
 
-        List<Product> products = productRepository.findAll();
+        Sort sort = sortDir.equalsIgnoreCase(Sort.Direction.ASC.name()) ? Sort.by(sortBy).ascending() : Sort.by(sortBy).descending();
+
+        Pageable pageable = PageRequest.of(pageNo, pageSize, sort);
+        Page<Product> products = productRepository.findAll(pageable);
+
+        List<Product> productList = products.getContent();
         //map to dtos
-        List<ProductDto> productDtoList = products.stream()
+        List<ProductDto> productDtoList = productList.stream()
                                                   .map(product -> mapToDto(product))
                                                   .collect(Collectors.toList());
 

src/main/java/com/manir/springbootecommercerestapi/service/ProductService.java

@@ -7,7 +7,7 @@
 
 public interface ProductService {
     ProductDto createProduct(ProductDto productDto, MultipartFile file);
-    List<ProductDto> getAllProduct();
+    List<ProductDto> getAllProduct(int pageNo, int pageSize, String sortBy, String sortDir);
     ProductDto getProductById(Long productId);
     ProductDto updateProduct(Long categoryId, ProductDto productDto, Long productId);
     void deleteProduct(Long productId);

src/main/java/com/manir/springbootecommercerestapi/utils/Constant.java

@@ -0,0 +1,11 @@
+package com.manir.springbootecommercerestapi.utils;
+
+public class Constant {
+
+    //pagination properties
+    public static final String DEFAULT_PAGE_NUMBER = "0";
+    public static final String DEFAULT_PAGE_SIZE = "10";
+    public static final String DEFAULT_SORT_BY = "id";
+    public static final String DEFAULT_SORT_DIRECTION = "asc";
+
+}