preparing to load tags alongside with project tasks

core/src/main/java/de/srsoftware/umbrella/core/api/TagService.java

@@ -4,12 +4,23 @@ package de.srsoftware.umbrella.core.api;
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import java.util.Collection;
+import java.util.Map;
 
 public interface TagService {
 	void deleteEntity(String task, long taskId);
 
 	Collection<String> getTags(String module, long entityId, UmbrellaUser user) throws UmbrellaException;
 
+	/**
+	 * Loads the tags for all the entities denominated by the collection <em>entityIds</em>.
+	 * @param module the realm the entities belong to
+	 * @param entityIds the set of entities of the respective realm
+	 * @param user the user, for whom the tags shall be loaded
+	 * @return a map from entity ids to assigned tags
+	 * @throws UmbrellaException
+	 */
+	Map<Long, ? extends Collection<String>> getTags(String module, Collection<Long> entityIds, UmbrellaUser user) throws UmbrellaException;
+
 	void save(String module, long entityId, Collection<Long> userIds, Collection<String> tags);
 
 	String save(String module, long entityId, Collection<Long> userIds, String tag);

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

@@ -253,8 +253,13 @@ CREATE TABLE IF NOT EXISTS {0} (
 	public Set<String> list(long userId, String module, long entityId) {
 		try {
 			var tags = new HashSet<String>();
+
+			// load tags assigned to user
 			var rs = select(TAG).from(TABLE_TAGS).where(MODULE,equal(module)).where(ENTITY_ID,equal(entityId)).where(USER_ID,equal(userId)).exec(db);
 			while (rs.next()) tags.add(rs.getString(1));
+			rs.close();
+
+			// load tags assigned to no user
 			rs = select(TAG).from(TABLE_TAGS).where(MODULE,equal(module)).where(ENTITY_ID,equal(entityId)).where(USER_ID,isNull()).exec(db);
 			while (rs.next()) tags.add(rs.getString(1));
 			rs.close();
@@ -264,6 +269,26 @@ CREATE TABLE IF NOT EXISTS {0} (
 		}
 	}
 
+	@Override
+	public Map<Long, ? extends Collection<String>> list(long userId, String module, Collection<Long> entityIds) {
+		try {
+			var tags = new HashMap<Long,HashSet<String>>();
+
+			// load tags assigned to user
+			var rs = select(ENTITY_ID,TAG).from(TABLE_TAGS).where(MODULE,equal(module)).where(ENTITY_ID,in(entityIds.toArray())).where(USER_ID,equal(userId)).exec(db);
+			while (rs.next()) tags.computeIfAbsent(rs.getLong(ENTITY_ID), k -> new HashSet<>()).add(rs.getString(TAG));
+			rs.close();
+
+			// load tags assigned to no user
+			rs = select(TAG).from(TABLE_TAGS).where(MODULE,equal(module)).where(ENTITY_ID,in(entityIds.toArray())).where(USER_ID,isNull()).exec(db);
+			while (rs.next()) tags.computeIfAbsent(rs.getLong(ENTITY_ID), k -> new HashSet<>()).add(rs.getString(TAG));
+			rs.close();
+			return tags;
+		} catch (SQLException e) {
+			throw new UmbrellaException("Failed to load tags");
+		}
+	}
+
 	@Override
 	public void save(Collection<Long> userIds, String module, long entityId, Collection<String> tags) {
 		try {

tags/src/main/java/de/srsoftware/umbrella/tags/TagDB.java

@@ -1,6 +1,8 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.tags;
 
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -15,8 +17,16 @@ public interface TagDB {
 
 	Set<String> list(long userId, String module, long entityId);
 
+	/**
+	 * Loads the tags for all the entities denominated by the collection <em>entityIds</em>.
+	 * @param module the realm the entities belong to
+	 * @param entityIds the set of entities of the respective realm
+	 * @param userId the id of the user, for whom the tags shall be loaded
+	 * @return a map from entity ids to assigned tags
+	 */
+	Map<Long, ? extends Collection<String>> list(long userId, String module, Collection<Long> entityIds);
+
 	void save(Collection<Long> userIds, String module, long entityId, Collection<String> tags);
 
 	void updateId(String module, Object oldId, Object newId);
-
 }

tags/src/main/java/de/srsoftware/umbrella/tags/TagModule.java

@@ -121,6 +121,11 @@ public class TagModule extends BaseHandler implements TagService {
 		return tagDb.list(user.id(),module,entityId);
 	}
 
+	@Override
+	public Map<Long, ? extends Collection<String>> getTags(String module, Collection<Long> entityIds, UmbrellaUser user) throws UmbrellaException {
+		return tagDb.list(user.id(),module,entityIds);
+	}
+
 	@Override
 	public void save(String module, long entityId, Collection<Long> userIds, Collection<String> tags) {
 		tagDb.save(userIds,module,entityId,tags);

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

@@ -13,6 +13,7 @@ import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.*;
 import static de.srsoftware.umbrella.core.model.Permission.*;
 import static de.srsoftware.umbrella.project.Constants.PERMISSIONS;
 import static de.srsoftware.umbrella.task.Constants.*;
+import static java.lang.System.Logger.Level.DEBUG;
 import static java.lang.System.Logger.Level.WARNING;
 import static java.net.HttpURLConnection.HTTP_BAD_REQUEST;
 
@@ -390,9 +391,17 @@ public class TaskModule extends BaseHandler implements TaskService {
 		var projectId    = json.has(PROJECT_ID)     && json.get(PROJECT_ID)     instanceof Number number ? number.longValue() : null;
 		var parentTaskId = json.has(PARENT_TASK_ID) && json.get(PARENT_TASK_ID) instanceof Number number ? number.longValue() : null;
 		if (isSet(projectId)) {
-			if (parentTaskId == null) return sendContent(ex, mapValues(taskDb.listRootTasks(projectId, user, showClosed)));
+			if (parentTaskId == null) {
+				var list = taskDb.listRootTasks(projectId, user, showClosed);
+				return sendContent(ex, mapValues(list));
+			}
 			var projectTasks = taskDb.listProjectTasks(projectId, parentTaskId, noIndex);
 			loadMembers(projectTasks.values());
+			var tags = tagService().getTags(TASK,projectTasks.keySet(),user);
+			LOG.log(DEBUG,"tags: {0}",tags);
+
+			// TODO: add tags to result map
+
 			return sendContent(ex, mapValues(projectTasks));
 		}
 		if (isSet(parentTaskId)) return sendContent(ex, mapValues(taskDb.listChildrenOf(parentTaskId, user, showClosed)));