preparing for task dependency implementation

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/Constants.java

@@ -6,7 +6,6 @@ import static java.nio.charset.StandardCharsets.UTF_8;
 
 public class Constants {
 
-
 	private Constants(){}
 
 	public static final String ADDRESS = "address";
@@ -140,6 +139,7 @@ public class Constants {
 	public static final String RECEIVERS = "receivers";
 	public static final String REDIRECT = "redirect";
 	public static final String RENDERED = "rendered";
+	public static final String REQUIRED_TASKS_IDS = "required_tasks_ids";
 
 	public static final String SENDER = "sender";
 	public static final String SETTINGS = "settings";

core/src/main/java/de/srsoftware/umbrella/core/model/Task.java

@@ -20,6 +20,7 @@ public class Task implements Mappable {
 	private final long id, projectId;
 	private Long parentTaskId;
 	private String description, name;
+	private Set<Long> requiredTasksIds;
 	private int status;
 	private Double estimatedTime;
 	private LocalDate dueDate, start;
@@ -41,6 +42,7 @@ public class Task implements Mappable {
 		this.showClosed = showClosed;
 		this.noIndex = noIndex;
 		this.members = members;
+		this.requiredTasksIds = new HashSet<>();
 	}
 
 	public Task clean() {
@@ -131,8 +133,6 @@ public class Task implements Mappable {
 			default -> throw invalidFieldException(json.get(DESCRIPTION).getClass().getSimpleName(),"String or JSON");
 		};
 
-
-
 		var status = Status.OPEN.code();
 		if (json.has(STATUS) && json.get(STATUS) instanceof JSONObject state){
 			if (state.get(CODE) instanceof Number code) status = code.intValue();
@@ -185,6 +185,10 @@ public class Task implements Mappable {
 		return projectId;
 	}
 
+	public Set<Long> requiredTasksIds(){
+		return requiredTasksIds;
+	}
+
 	public boolean showClosed(){
 		return showClosed;
 	}
@@ -216,6 +220,7 @@ public class Task implements Mappable {
 		map.put(SHOW_CLOSED,showClosed);
 		map.put(NO_INDEX,noIndex);
 		map.put(MEMBERS,memberMap);
+		map.put(REQUIRED_TASKS_IDS,requiredTasksIds);
 
 		return map;
 	}

task/src/main/java/de/srsoftware/umbrella/task/Constants.java

@@ -5,9 +5,12 @@ public class Constants {
 	private Constants(){}
 
 
+
 	public static final String CONFIG_DATABASE = "umbrella.modules.task.database";
 	public static final String CHILDREN = "children";
 	public static final String ESTIMATED_TIMES = "estimated_times";
+	public static final String REQUIRED_TASK_ID = "required_task_id";
+	public static final String TABLE_TASK_DEPENDENCIES = "task_dependencies";
 	public static final String TABLE_TASKS = "tasks";
 	public static final String TABLE_TASKS_USERS = "tasks_users";
 	public static final String TASK = "task";

task/src/main/java/de/srsoftware/umbrella/task/SqliteDb.java

@@ -35,16 +35,31 @@ public class SqliteDb extends BaseDb implements TaskDb {
 		int currentVersion = createSettingsTable();
 		switch (currentVersion){
 			case 0:
-				createTaskTables();
+				createTaskTable();
 				createTasksUsersTable();
 			case 1:
 				swapStates(TABLE_TASKS);
+			case 2:
+				createDependencyTable();
 		}
 
-		return setCurrentVersion(2);
+		return setCurrentVersion(3);
 	}
 
-	private void createTaskTables() {
+	private void createDependencyTable() {
+		var sql = "CREATE TABLE IF NOT EXISTS {0} ({1} INT NOT NULL, {2} INT NOT NULL, PRIMARY KEY({1}, {2}))";
+		sql = format(sql,TABLE_TASK_DEPENDENCIES,TASK_ID,REQUIRED_TASK_ID);
+		try {
+			var stmt = db.prepareStatement(sql);
+			stmt.execute();
+			stmt.close();
+		} catch (SQLException e) {
+			LOG.log(ERROR, ERROR_FAILED_CREATE_TABLE, TABLE_TASK_DEPENDENCIES, e);
+			throw new RuntimeException(e);
+		}
+	}
+
+	private void createTaskTable() {
 		var createTable = """
 				CREATE TABLE IF NOT EXISTS "{0}" (
 					{1} INTEGER PRIMARY KEY,