implemented listing of list members

src/main/java/de/srsoftware/widerhall/data/ListMember.java

@@ -5,8 +5,10 @@ import org.slf4j.LoggerFactory;
 
 import java.sql.SQLException;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import static de.srsoftware.widerhall.Constants.*;
 import static de.srsoftware.widerhall.Constants.STATE;
@@ -59,6 +61,27 @@ public class ListMember {
         return list;
     }
 
+    public static Map<User,Integer> of(String listEmail) throws SQLException {
+        var rs = Database.open()
+                .query("SELECT * FROM "+TABLE_NAME)
+                .where(LIST_EMAIL,listEmail)
+                .exec();
+        var temp = new HashMap<String,Integer>();
+        while (rs.next()) temp.put(rs.getString(USER_EMAIL),rs.getInt(STATE));
+        var result = new HashMap<User,Integer>();
+        User.loadAll(temp.keySet())
+                .stream()
+                .forEach(user -> result.put(user,temp.get(user.email())));
+        return result;
+    }
+
+    public static String stateText(int state) {
+        var words = new ArrayList<String>();
+        if ((state & STATE_OWNER) > 0) words.add("owener");
+        if ((state & STATE_SUBSCRIBER) > 0) words.add("subscriber");
+        return String.join(", ",words);
+    }
+
     private ListMember save() throws SQLException {
         Database.open().insertInto(TABLE_NAME)
                 .values(Map.of(LIST_EMAIL,listEmail,