Working on db changing methods.

src/main/java/ru/simsonic/rscPermissions/Engine/Backends/DatabaseTransaction.java

@@ -1,8 +1,12 @@
 package ru.simsonic.rscPermissions.Engine.Backends;
 
+import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
 import ru.simsonic.rscMinecraftLibrary.Bukkit.CommandAnswerException;
+import ru.simsonic.rscMinecraftLibrary.Bukkit.GenericChatCodes;
+import ru.simsonic.rscPermissions.API.RowInheritance;
+import ru.simsonic.rscPermissions.API.RowPermission;
 import ru.simsonic.rscPermissions.BukkitPluginMain;
 
 public class DatabaseTransaction
@@ -22,15 +26,7 @@ public class DatabaseTransaction
 	*/
 	public void apply() throws CommandAnswerException
 	{
-		// START TRANSACTION AND LOCK TABLE
+		final DatabaseContents contents = prepareChanges();
-		rscp.connection.lockTableEntities();
-		rscp.connection.lockTablePermissions();
-		rscp.connection.lockTableInheritance();
-		rscp.connection.transactionStart();
-		
-		// SELECT FROM DATABASE INTO LOCAL CACHE TO MAKE IT ACTUAL
-		final DatabaseContents contents = rscp.commandHelper.threadFetchDatabaseContents.remoteToLocal();
-		
 		// UNDERSTAND WHAT TO DO
 		if(contents != null)
 		{
@@ -44,13 +40,80 @@ public class DatabaseTransaction
 			{
 				
 			}
-		}
+			// COMMIT CHANGES AND UNLOCK TABLES
-		
+			finishChanges(true);
-		// COMMIT CHANGES AND UNLOCK TABLE
+		} else
-		rscp.connection.transactionCommit();
+			// CANCEL TRANSACTION AND UNLOCK TABLES
-		rscp.connection.unlockAllTables();
+			finishChanges(false);
-		
+	}
+	private void applyAddUserPermission()
+	{
+	}
+	private void applyAddUserInheritance()
+	{
+	}
+	private void applyRemoveUserPermission()
+	{
+	}
+	private void applyRemoveUserInheritance()
+	{
+	}
+	private DatabaseContents prepareChanges()
+	{
+		// START TRANSACTION AND LOCK TABLE
+		rscp.connection.lockTableEntities();
+		rscp.connection.lockTablePermissions();
+		rscp.connection.lockTableInheritance();
+		rscp.connection.transactionStart();
+		// SELECT FROM DATABASE INTO LOCAL CACHE TO MAKE IT ACTUAL
+		return rscp.commandHelper.threadFetchDatabaseContents.remoteToLocal();
+	}
+	private void finishChanges(boolean commit)
+	{
+		// COMMIT OR ROLLBACK ACTIONS
+		if(commit)
+			rscp.connection.transactionCommit();
+		else
+			rscp.connection.transactionCommit();
 		// CALL PLUGIN TO APPLY ALL THIS CHANGES
 		rscp.commandHelper.threadFetchDatabaseContents.run();
 	}
+	private RowPermission restorePermissionsAfterDelete(DatabaseContents contents, RowPermission remove)
+	{
+		final LinkedList<RowPermission> sameIDs = new LinkedList<>();
+		for(RowPermission row : contents.permissions)
+			if(row.id == remove.id)
+				sameIDs.add(row);
+		if(sameIDs.isEmpty() == false)
+		{
+			final HashSet<String> names = new HashSet<>();
+			final HashSet<String> perms = new HashSet<>();
+			final HashSet<String> dests = new HashSet<>();
+			for(RowPermission row : sameIDs)
+			{
+				// assert remove.value == row.value;
+				// assert remove.expirience == row.expirience;
+				// assert remove.entityType.equals(row.entityType);
+				// assert remove.lifetime.equals(row.lifetime);
+				names.add(row.entity);
+				perms.add(row.permission);
+				dests.add(row.destination.toString());
+			}
+			try
+			{
+				final RowPermission merged = remove.clone();
+				merged.entity            = GenericChatCodes.glue(names.toArray(new String[names.size()]), "; \n");
+				merged.permission        = GenericChatCodes.glue(perms.toArray(new String[names.size()]), "; \n");
+				merged.destinationSource = GenericChatCodes.glue(dests.toArray(new String[names.size()]), "; \n");
+				return merged;
+			} catch(CloneNotSupportedException ex) {
+				// IMPOSSIBLE
+			}
+		}
+		return null;
+	}
+	private RowPermission restoreInheritanceAfterDelete(DatabaseContents contents, RowInheritance remove)
+	{
+		return null;
+	}
 }