custom pagination

src/main/java/com/ziplinegreen/vault/Controller/PostController.java

@@ -3,12 +3,19 @@ package com.ziplinegreen.vault.Controller;
 import com.ziplinegreen.vault.Model.Post;
 import com.ziplinegreen.vault.Service.PostService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
 import org.springframework.http.ResponseEntity;
 import org.springframework.messaging.handler.annotation.MessageMapping;
 import org.springframework.messaging.handler.annotation.SendTo;
 import org.springframework.web.bind.annotation.*;
 
-import java.util.Collection;
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
 
 @CrossOrigin
 @RestController
@@ -33,9 +40,22 @@ public class PostController {
     }
 
 
+//    @GetMapping("/posts/all")
+//    public Iterable<Post> getAllPosts() {
+//        return postService.getAllPosts();
+//    }
+
     @GetMapping("/posts/all")
-    public Iterable<Post> getAllPosts() {
-        return postService.getAllPosts();
+    Page<Post> pageAllPosts(Pageable pageable) {
+       Iterable<Post> posts = postService.getAllPosts();
+       List<Post> postList = StreamSupport.stream(posts.spliterator(), false)
+               .collect(Collectors.toList());
+       Collections.reverse(postList);
+
+        int start = (int)pageable.getOffset();
+        int end = (start + pageable.getPageSize()) > postList.size() ? postList.size() : (start + pageable.getPageSize());
+
+        return new PageImpl<Post>(postList.subList(start,end),pageable, postList.size());
     }
 
     @GetMapping("/posts/id/{userId}")

src/main/java/com/ziplinegreen/vault/Repository/PostRepository.java

@@ -1,6 +1,8 @@
 package com.ziplinegreen.vault.Repository;
 
 import com.ziplinegreen.vault.Model.Post;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.rest.core.annotation.RepositoryRestResource;
 import java.util.Collection;
@@ -8,4 +10,5 @@ import java.util.Collection;
 @RepositoryRestResource
 public interface PostRepository extends JpaRepository<Post,Long> {
     Collection<Post> findByUserId(Long userId);
+
 }

src/main/java/com/ziplinegreen/vault/Service/PostService.java

@@ -4,16 +4,20 @@ package com.ziplinegreen.vault.Service;
 import com.ziplinegreen.vault.Model.Post;
 import com.ziplinegreen.vault.Repository.PostRepository;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import java.util.Collection;
 
 @Service
+@Transactional
 public class PostService {
 
-    @Autowired
+
     private PostRepository postRepository;
 
     @Autowired
@@ -52,5 +56,9 @@ public class PostService {
         return postRepository.save(post);
     }
 
+    public Page<Post> listAllByPage(Pageable pageable) {
+
+       return postRepository.findAll(pageable);
+    }
 }