Add pagination and sorting functionality to API endpoints

.gitignore

@@ -12,6 +12,7 @@ target/
 .settings
 .springBeans
 .sts4-cache
+/bin/
 
 ### IntelliJ IDEA ###
 .idea

src/main/java/com/libraryman_api/book/BookController.java

@@ -2,11 +2,14 @@
 
 import com.libraryman_api.exception.ResourceNotFoundException;
 import org.springframework.beans.factory.annotation.Autowired;
+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.data.web.PageableDefault;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
-import java.util.List;
-
 /**
  * REST controller for managing books in the LibraryMan application.
  * This controller provides endpoints for performing CRUD operations on books,
@@ -21,13 +24,30 @@ public class BookController {
     private BookService bookService;
 
     /**
-     * Retrieves a list of all books in the library.
+     * Retrieves a paginated and sorted list of all books in the library.
      *
-     * @return a list of {@link Book} objects representing all the books in the library.
+     * @param pageable contains pagination information (page number, size, and sorting).
+     * @param sortBy (optional) the field by which to sort the results.
+     * @param sortDir (optional) the direction of sorting (asc or desc). Defaults to ascending.
+     * @return a {@link Page} of {@link Book} objects representing the books in the library.
+     *         The results are sorted by title by default and limited to 5 books per page.
      */
     @GetMapping
-    public List<Book> getAllBooks() {
-        return bookService.getAllBooks();
+    public Page<Book> getAllBooks(@PageableDefault(page=0, size=5, sort="title") Pageable pageable,
+    								@RequestParam(required = false) String sortBy,
+    								@RequestParam(required = false) String sortDir) {
+
+        // Adjust the pageable based on dynamic sorting parameters
+    	if(sortBy!=null && !sortBy.isEmpty()) {
+    		Sort.Direction direction= Sort.Direction.ASC; // Default direction
+
+    		if(sortDir!=null && sortDir.equalsIgnoreCase("desc")) {
+    			direction = Sort.Direction.DESC;
+    		}
+
+    		pageable = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(), Sort.by(direction, sortBy)) ;   		
+    	}
+        return bookService.getAllBooks(pageable);
     }
 
     /**

src/main/java/com/libraryman_api/book/BookService.java

@@ -1,10 +1,12 @@
 package com.libraryman_api.book;
 
-import com.libraryman_api.exception.ResourceNotFoundException;
+import java.util.Optional;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 
-import java.util.List;
-import java.util.Optional;
+import com.libraryman_api.exception.ResourceNotFoundException;
 
 /**
  * Service class for managing books in the LibraryMan system.
@@ -36,12 +38,13 @@ public BookService(BookRepository bookRepository) {
     }
 
     /**
-     * Retrieves all books from the database.
+     * Retrieves a paginated list of all books from the database.
      *
-     * @return a list of all books
+     * @param pageable the pagination information, including the page number and size
+     * @return a {@link Page} of {@link Book} representing all books
      */
-    public List<Book> getAllBooks() {
-        return bookRepository.findAll();
+    public Page<Book> getAllBooks(Pageable pageable) {
+        return bookRepository.findAll(pageable);
     }
 
     /**

src/main/java/com/libraryman_api/borrowing/BorrowingController.java

@@ -1,9 +1,13 @@
 package com.libraryman_api.borrowing;
 
 import com.libraryman_api.exception.ResourceNotFoundException;
-import org.springframework.web.bind.annotation.*;
 
-import java.util.List;
+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.data.web.PageableDefault;
+import org.springframework.web.bind.annotation.*;
 
 /**
  * REST controller for managing borrowings in the LibraryMan application.
@@ -26,13 +30,31 @@ public BorrowingController(BorrowingService borrowingService) {
     }
 
     /**
-     * Retrieves a list of all borrowing records in the library.
+     * Retrieves a paginated and sorted list of all borrowing records in the library.
      *
-     * @return a list of {@link Borrowings} objects representing all borrowings.
+     * @param pageable contains pagination information (page number, size, and sorting).
+     * @param sortBy (optional) the field by which to sort the results.
+     * @param sortDir (optional) the direction of sorting (asc or desc). Defaults to ascending.
+     * @return a {@link Page} of {@link Borrowings} representing all borrowings.
+     *         The results are sorted by borrow date by default and limited to 5 members per page.
      */
     @GetMapping
-    public List<Borrowings> getAllBorrowings() {
-        return borrowingService.getAllBorrowings();
+    public Page<Borrowings> getAllBorrowings(@PageableDefault(page=0, size=5, sort="borrowDate") Pageable pageable,
+												@RequestParam(required = false) String sortBy,
+												@RequestParam(required = false) String sortDir) {
+
+    	// Adjust the pageable based on dynamic sorting parameters
+    	if(sortBy!=null && !sortBy.isEmpty()) {
+    		Sort.Direction direction= Sort.Direction.ASC; // Default direction
+
+    		if(sortDir!=null && sortDir.equalsIgnoreCase("desc")) {
+    			direction = Sort.Direction.DESC;
+    		}
+
+    		pageable = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(), Sort.by(direction, sortBy)) ;   		
+    	}
+
+        return borrowingService.getAllBorrowings(pageable);
     }
 
     /**
@@ -69,14 +91,33 @@ public String payFine(@PathVariable int id) {
     }
 
     /**
-     * Retrieves all borrowing records for a specific member.
+     * Retrieves a paginated and sorted list of all borrowing records for a specific member.
      *
      * @param memberId the ID of the member whose borrowing records are to be retrieved.
-     * @return a list of {@link Borrowings} objects representing the member's borrowings.
+     * @param pageable contains pagination information (page number, size, and sorting).
+     * @param sortBy (optional) the field by which to sort the results.
+     * @param sortDir (optional) the direction of sorting (asc or desc). Defaults to ascending.
+     * @return a {@link Page} of {@link Borrowings} representing all borrowings for a specific member.
+     *         The results are sorted by borrow date by default and limited to 5 members per page.
      */
     @GetMapping("member/{memberId}")
-    public List<Borrowings> getAllBorrowingsOfAMember(@PathVariable int memberId) {
-        return borrowingService.getAllBorrowingsOfMember(memberId);
+    public Page<Borrowings> getAllBorrowingsOfAMember(@PathVariable int memberId, 
+    													@PageableDefault(page=0, size=5, sort="borrowDate") Pageable pageable,
+    													@RequestParam(required = false) String sortBy,
+    													@RequestParam(required = false) String sortDir) {
+
+    	// Adjust the pageable based on dynamic sorting parameters
+    	if(sortBy!=null && !sortBy.isEmpty()) {
+    		Sort.Direction direction= Sort.Direction.ASC; // Default direction
+
+    		if(sortDir!=null && sortDir.equalsIgnoreCase("desc")) {
+    			direction = Sort.Direction.DESC;
+    		}
+
+    		pageable = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(), Sort.by(direction, sortBy)) ;   		
+    	}
+
+        return borrowingService.getAllBorrowingsOfMember(memberId, pageable);
     }
 
     /**

src/main/java/com/libraryman_api/borrowing/BorrowingRepository.java

@@ -1,16 +1,17 @@
 package com.libraryman_api.borrowing;
 
+import java.util.List;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
-import java.util.List;
-import java.util.Optional;
-
 @Repository
 public interface BorrowingRepository extends JpaRepository<Borrowings, Integer> {
 
     // Underscore (_) used for property traversal, navigating from Borrowings to Members entity via 'member' property
-    Optional<List<Borrowings>> findByMember_memberId(int memberId);
+    Page<Borrowings> findByMember_memberId(int memberId, Pageable pageable);
     List<Borrowings> findByBook_bookId(int bookId);
 }
 

src/main/java/com/libraryman_api/borrowing/BorrowingService.java

@@ -8,13 +8,15 @@
 import com.libraryman_api.member.MemberService;
 import com.libraryman_api.member.Members;
 import com.libraryman_api.notification.NotificationService;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import java.math.BigDecimal;
 import java.time.temporal.ChronoUnit;
 import java.util.Calendar;
 import java.util.Date;
-import java.util.List;
 import java.util.Optional;
 
 /**
@@ -60,12 +62,13 @@ public BorrowingService(BorrowingRepository borrowingRepository, FineRepository
     }
 
     /**
-     * Retrieves all borrowings from the database.
+     * Retrieves a paginated list of all borrowing records from the database.
      *
-     * @return a list of all borrowings
+     * @param pageable the pagination information, including the page number and size
+     * @return a {@link Page} of {@link Borrowings} representing all borrowings
      */
-    public List<Borrowings> getAllBorrowings() {
-        return borrowingRepository.findAll();
+    public Page<Borrowings> getAllBorrowings(Pageable pageable) {
+        return borrowingRepository.findAll(pageable);
     }
 
     /**
@@ -256,13 +259,19 @@ private BigDecimal calculateFineAmount(Borrowings borrowing) {
     }
 
     /**
-     * Retrieves all borrowings associated with a specific member.
+     * Retrieves a paginated list of all borrowing associated with a specific member.
      *
      * @param memberId the ID of the member whose borrowings are to be retrieved
-     * @return a list of borrowings associated with the specified member
+     * @param pageable the pagination information, including the page number and size
      * @throws ResourceNotFoundException if the member has not borrowed any books
+     * @return a {@link Page} of {@link Borrowings} representing all borrowing associated with a specific member
      */
-    public List<Borrowings> getAllBorrowingsOfMember(int memberId) {
-        return borrowingRepository.findByMember_memberId(memberId).orElseThrow(() -> new ResourceNotFoundException("Member didn't borrow any book"));
+    public Page<Borrowings> getAllBorrowingsOfMember(int memberId, Pageable pageable) {        
+        Page<Borrowings> borrowings = borrowingRepository.findByMember_memberId(memberId, pageable);
+
+        if (borrowings.isEmpty()) {
+            throw new ResourceNotFoundException("Member didn't borrow any book");
+        }
+        return borrowings;
     }
 }

src/main/java/com/libraryman_api/member/MemberController.java

@@ -1,11 +1,15 @@
 package com.libraryman_api.member;
 
 import com.libraryman_api.exception.ResourceNotFoundException;
+
+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.data.web.PageableDefault;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
-import java.util.List;
-
 /**
  * REST controller for managing library members.
  * This controller provides endpoints for performing CRUD operations on members.
@@ -26,13 +30,31 @@ public MemberController(MemberService memberService) {
     }
 
     /**
-     * Retrieves a list of all library members.
+     * Retrieves a paginated and sorted list of all library members.
      *
-     * @return a list of {@link Members} representing all members in the library
+     * @param pageable contains pagination information (page number, size, and sorting).
+     * @param sortBy (optional) the field by which to sort the results.
+     * @param sortDir (optional) the direction of sorting (asc or desc). Defaults to ascending.
+     * @return a {@link Page} of {@link Members} representing all members in the library.
+     *         The results are sorted by name by default and limited to 5 members per page.
      */
     @GetMapping
-    public List<Members> getAllMembers() {
-        return memberService.getAllMembers();
+    public Page<Members> getAllMembers(@PageableDefault(page=0, size=5, sort="name") Pageable pageable,
+										@RequestParam(required = false) String sortBy,
+										@RequestParam(required = false) String sortDir) {
+
+    	// Adjust the pageable based on dynamic sorting parameters
+    	if(sortBy!=null && !sortBy.isEmpty()) {
+    		Sort.Direction direction= Sort.Direction.ASC; // Default direction
+
+    		if(sortDir!=null && sortDir.equalsIgnoreCase("desc")) {
+    			direction = Sort.Direction.DESC;
+    		}
+
+    		pageable = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(), Sort.by(direction, sortBy)) ;   		
+    	}
+
+        return memberService.getAllMembers(pageable);
     }
 
     /**

src/main/java/com/libraryman_api/member/MemberService.java

@@ -1,10 +1,13 @@
 package com.libraryman_api.member;
 
+import java.util.Optional;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+
 import com.libraryman_api.exception.ResourceNotFoundException;
 import com.libraryman_api.notification.NotificationService;
-import org.springframework.stereotype.Service;
-import java.util.List;
-import java.util.Optional;
 
 /**
  * Service class responsible for managing member-related operations in the LibraryMan system.
@@ -39,12 +42,13 @@ public MemberService(MemberRepository memberRepository, NotificationService noti
     }
 
     /**
-     * Retrieves all members from the database.
+     * Retrieves a paginated list of all members from the database.
      *
-     * @return a list of all members
+     * @param pageable the pagination information, including the page number and size
+     * @return a {@link Page} of {@link Members} representing all members
      */
-    public List<Members> getAllMembers() {
-        return memberRepository.findAll();
+    public Page<Members> getAllMembers(Pageable pageable) {
+        return memberRepository.findAll(pageable);
     }
 
     /**