#622 - migrate category attributes on start

src/main/java/de/deadlocker8/budgetmaster/categories/CategoryService.java

 package de.deadlocker8.budgetmaster.categories;
 
+import de.deadlocker8.budgetmaster.icon.Icon;
+import de.deadlocker8.budgetmaster.icon.IconService;
 import de.deadlocker8.budgetmaster.services.AccessAllEntities;
 import de.deadlocker8.budgetmaster.services.Resettable;
 import de.deadlocker8.budgetmaster.transactions.Transaction;
@@ -11,6 +13,7 @@ import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+import java.text.MessageFormat;
 import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.Optional;
@@ -20,11 +23,13 @@ public class CategoryService implements Resettable, AccessAllEntities<Category>
 {
 	private static final Logger LOGGER = LoggerFactory.getLogger(CategoryService.class);
 	private final CategoryRepository categoryRepository;
+	private final IconService iconService;
 
 	@Autowired
-	public CategoryService(CategoryRepository categoryRepository)
+	public CategoryService(CategoryRepository categoryRepository, IconService iconService)
 	{
 		this.categoryRepository = categoryRepository;
+		this.iconService = iconService;
 
 		createDefaults();
 	}
@@ -97,6 +102,27 @@ public class CategoryService implements Resettable, AccessAllEntities<Category>
 			categoryRepository.save(new Category(Localization.getString(Strings.CATEGORY_REST), "#FFFF00", CategoryType.REST));
 			LOGGER.debug("Created default category REST");
 		}
+
+		updateMissingAttributes();
+	}
+
+	private void updateMissingAttributes()
+	{
+		for(Category category : categoryRepository.findAll())
+		{
+			if(category.getIcon() != null && category.getIconReference() == null)
+			{
+				final String iconName = category.getIcon();
+				Icon iconReference = new Icon(iconName);
+				iconService.getRepository().save(iconReference);
+
+				category.setIconReference(iconReference);
+				category.setIcon(null);
+
+				categoryRepository.save(category);
+				LOGGER.debug(MessageFormat.format("Updated category {0}: Converted attribute \"icon\" to \"iconReference\" {1}", category.getName(), iconName));
+			}
+		}
 	}
 
 	@Override