#13 streams refactoring

src/main/java/ru/ulstu/file/service/FileService.java

@@ -11,10 +11,10 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 import java.util.UUID;
-import java.util.stream.Collectors;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 
@@ -84,10 +84,13 @@ public class FileService {
         fileRepository.delete(fileData);
     }
 
-    public List<FileData> saveOrCreate(List<FileDataDto> files) {
-        return files.stream().map(fileDataDto -> {
-            return fileDataDto.getId() != null ? update(fileDataDto) : create(fileDataDto);
-        }).collect(Collectors.toList());
+    public List<FileData> saveOrCreate(List<FileDataDto> fileDtos) throws IOException {
+        List<FileData> files = new ArrayList<>();
+        for (FileDataDto file : fileDtos) {
+            if (file.getId() != null) files.add(update(file));
+            else files.add(create(file));
+        }
+        return files;
     }
 
     @Transactional
@@ -98,12 +101,9 @@ public class FileService {
     }
 
     @Transactional
-    public FileData create(FileDataDto fileDataDto) {
-        FileData newFile = new FileData();
-        try {
-            newFile = createFileFromTmp(fileDataDto.getTmpFileName());
-        } catch (IOException e) {
-        }
+    public FileData create(FileDataDto fileDataDto) throws IOException {
+        FileData newFile = null;
+        newFile = createFileFromTmp(fileDataDto.getTmpFileName());
         copyFromDto(newFile, fileDataDto);
         newFile = fileRepository.save(newFile);
         return newFile;
@@ -115,9 +115,8 @@ public class FileService {
     }
 
     @Transactional
-    public void delete(Integer fileId) throws IOException {
-        FileData file = fileRepository.findOne(fileId);
-        fileRepository.delete(file);
+    public void delete(Integer fileId) {
+        fileRepository.delete(fileRepository.findOne(fileId));
     }
 
     public FileDataDto createFromMultipartFile(MultipartFile multipartFile) throws IOException {

src/main/java/ru/ulstu/paper/service/PaperService.java

@@ -20,8 +20,8 @@ import java.util.Date;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
-import java.util.stream.Collectors;
 
+import static java.util.stream.Collectors.toList;
 import static org.springframework.util.ObjectUtils.isEmpty;
 import static ru.ulstu.core.util.StreamApiUtils.convert;
 import static ru.ulstu.paper.model.Paper.PaperStatus.ATTENTION;
@@ -67,7 +67,7 @@ public class PaperService {
         return findAllDto()
                 .stream()
                 .filter(paper -> paper.getStatus() != COMPLETED && paper.getStatus() != FAILED)
-                .collect(Collectors.toList());
+                .collect(toList());
     }
 
     public PaperDto findOneDto(Integer id) {
@@ -90,7 +90,9 @@ public class PaperService {
         paper.setTitle(paperDto.getTitle());
         paper.setUpdateDate(new Date());
         paper.setDeadlines(deadlineService.saveOrCreate(paperDto.getDeadlines()));
-        paper.setFiles(fileService.saveOrCreate(paperDto.getFiles().stream().filter(f -> !f.isDeleted()).collect(Collectors.toList())));
+        paper.setFiles(fileService.saveOrCreate(paperDto.getFiles().stream()
+                .filter(f -> !f.isDeleted())
+                .collect(toList())));
         paper.getAuthors().clear();
         if (paperDto.getAuthorIds() != null && !paperDto.getAuthorIds().isEmpty()) {
             paperDto.getAuthorIds().forEach(authorIds -> paper.getAuthors().add(userService.findById(authorIds)));
@@ -104,7 +106,9 @@ public class PaperService {
         Paper.PaperStatus oldStatus = paper.getStatus();
         Set<User> oldAuthors = new HashSet<>(paper.getAuthors());
 
-        for (FileDataDto file : paperDto.getFiles().stream().filter(f -> f.isDeleted() && f.getId() != null).collect(Collectors.toList())) {
+        for (FileDataDto file : paperDto.getFiles().stream()
+                .filter(f -> f.isDeleted() && f.getId() != null)
+                .collect(toList())) {
             fileService.delete(file.getId());
         }
 
@@ -164,7 +168,7 @@ public class PaperService {
                 return statusCompareResult;
             }
             return paper1.getTitle().compareTo(paper2.getTitle());
-        }).collect(Collectors.toList());
+        }).collect(toList());
     }
 
     public PaperDto findPaper(int id) {
@@ -178,7 +182,7 @@ public class PaperService {
                         && (paper.getStatus() == ON_PREPARATION
                         || paper.getStatus() == DRAFT
                         || paper.getStatus() == ATTENTION))
-                .collect(Collectors.toList());
+                .collect(toList());
         papers.forEach(paper -> {
             Paper.PaperStatus oldStatus = paper.getStatus();
             paper.setStatus(Paper.PaperStatus.FAILED);