implemented document creation

this required a major refactoring of the object model

company/build.gradle.kts

@@ -2,5 +2,7 @@ description = "Umbrella : Companies"
 
 dependencies{
     implementation(project(":core"))
+    implementation("de.srsoftware:configuration.api:1.0.2")
+    implementation("de.srsoftware:tools.jdbc:1.3.2")
 }
 

company/src/main/java/de/srsoftware/umbrella/company/CompanyModule.java

@@ -1,21 +1,45 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.company;
 
+import static de.srsoftware.umbrella.company.Constants.CONFIG_DATABASE;
+import static de.srsoftware.umbrella.core.ConnectionProvider.connect;
+import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.missingFieldException;
+
+import de.srsoftware.configuration.Configuration;
+import de.srsoftware.umbrella.company.api.CompanyDb;
 import de.srsoftware.umbrella.core.api.CompanyService;
 import de.srsoftware.umbrella.core.api.UserService;
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+import de.srsoftware.umbrella.core.model.Company;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;
-import java.util.List;
+import java.util.Collection;
+import java.util.HashSet;
 
 public class CompanyModule implements CompanyService {
 
 	private final UserService users;
+	private final CompanyDb companyDb;
 
-	public CompanyModule(UserService userService){
+	public CompanyModule(Configuration config, UserService userService) throws UmbrellaException {
+		var dbFile = config.get(CONFIG_DATABASE).orElseThrow(() -> missingFieldException(CONFIG_DATABASE));
+		companyDb = new SqliteDb(connect(dbFile));
 		users = userService;
 	}
 
 	@Override
-	public List<UmbrellaUser> getMembers(long companyId) {
-		return null;
+	public Company get(long companyId) throws UmbrellaException {
+		return companyDb.load(companyId);
+	}
+
+	@Override
+	public Collection<UmbrellaUser> getMembers(long companyId) throws UmbrellaException {
+		var members = new HashSet<UmbrellaUser>();
+		for (var userId : companyDb.getMembers(companyId)) members.add(users.loadUser(userId));
+		return members;
+	}
+
+	@Override
+	public UserService userService() {
+		return users;
 	}
 }

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

@@ -0,0 +1,10 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.company;
+
+public class Constants {
+	private Constants(){}
+
+	public static final String CONFIG_DATABASE = "umbrella.modules.company.database";
+	public static final String TABLE_COMPANIES_USERS = "companies_users";
+	public static final String TABLE_COMPANIES = "companies";
+}

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

@@ -0,0 +1,52 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.company;
+
+import static de.srsoftware.tools.jdbc.Condition.equal;
+import static de.srsoftware.tools.jdbc.Query.select;
+import static de.srsoftware.umbrella.company.Constants.TABLE_COMPANIES;
+import static de.srsoftware.umbrella.company.Constants.TABLE_COMPANIES_USERS;
+import static de.srsoftware.umbrella.core.Constants.*;
+
+import de.srsoftware.umbrella.company.api.CompanyDb;
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+import de.srsoftware.umbrella.core.model.Company;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+
+public class SqliteDb implements CompanyDb {
+
+	private final Connection db;
+
+	public SqliteDb(Connection connection) {
+		db = connection;
+	}
+
+	@Override
+	public Collection<Long> getMembers(long companyId) throws UmbrellaException {
+		try {
+			var rs = select("*").from(TABLE_COMPANIES_USERS).where(COMPANY_ID, equal(companyId)).exec(db);
+			var ids = new HashSet<Long>();
+			while (rs.next()) ids.add(rs.getLong(USER_ID));
+			rs.close();
+			return ids;
+		} catch (SQLException e) {
+			throw new UmbrellaException("Failed to load members of company {0}",companyId);
+		}
+	}
+
+	@Override
+	public Company load(long companyId) throws UmbrellaException {
+		try {
+			var rs = select("*").from(TABLE_COMPANIES).where(ID, equal(companyId)).exec(db);
+			Company company = null;
+			if (rs.next()) company = Company.of(rs);
+			rs.close();
+			if (company == null) throw new UmbrellaException("Could not load company {0}",companyId);
+			return company;
+		} catch (SQLException e){
+			throw new UmbrellaException("Could not load company {0}",companyId);
+		}
+	}
+}

company/src/main/java/de/srsoftware/umbrella/company/api/CompanyDb.java

@@ -0,0 +1,12 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.company.api;
+
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+import de.srsoftware.umbrella.core.model.Company;
+import java.util.Collection;
+
+public interface CompanyDb {
+	Collection<Long> getMembers(long companyId) throws UmbrellaException;
+
+	Company load(long companyId) throws UmbrellaException;
+}