1 files changed, 16 insertions, 0 deletions
diff --git a/src/org/traccar/database/DeviceManager.java b/src/org/traccar/database/DeviceManager.java
index c70e67231..a75b0616c 100644
--- a/src/org/traccar/database/DeviceManager.java
+++ b/src/org/traccar/database/DeviceManager.java
@@ -49,6 +49,7 @@ public class DeviceManager implements IdentityManager {
     private AtomicLong devicesLastUpdate = new AtomicLong();
 
     private Map<Long, Group> groupsById;
+    private Map<String, Group> groupsByName;
     private AtomicLong groupsLastUpdate = new AtomicLong();
 
     private final Map<Long, Position> positions = new ConcurrentHashMap<>();
@@ -245,6 +246,9 @@ public class DeviceManager implements IdentityManager {
             if (groupsById == null) {
                 groupsById = new ConcurrentHashMap<>(databaseGroups.size());
             }
+            if (groupsByName == null) {
+                groupsByName = new ConcurrentHashMap<>(databaseGroups.size());
+            }
             Set<Long> databaseGroupsIds = new HashSet<>();
             for (Group group : databaseGroups) {
                 databaseGroupsIds.add(group.getId());
@@ -254,6 +258,7 @@ public class DeviceManager implements IdentityManager {
                     cachedGroup.setGroupId(group.getGroupId());
                 } else {
                     groupsById.put(group.getId(), group);
+                    groupsByName.put(group.getName(), group);
                 }
             }
             for (Long cachedGroupId : groupsById.keySet()) {
@@ -269,6 +274,10 @@ public class DeviceManager implements IdentityManager {
         return groupsById.get(id);
     }
 
+    public Group getGroupByName(String name) {
+        return groupsByName.get(name);
+    }
+
     public Collection<Group> getAllGroups() {
         boolean forceUpdate = groupsById.isEmpty();
 
@@ -304,17 +313,24 @@ public class DeviceManager implements IdentityManager {
         checkGroupCycles(group);
         dataManager.addGroup(group);
         groupsById.put(group.getId(), group);
+        groupsByName.put(group.getName(), group);
     }
 
     public void updateGroup(Group group) throws SQLException {
+        String oldGroupName = groupsById.get(group.getId()).getName();
         checkGroupCycles(group);
         dataManager.updateGroup(group);
         groupsById.put(group.getId(), group);
+        if (!oldGroupName.equals(group.getName())) {
+            groupsByName.remove(oldGroupName);
+        }
+        groupsByName.put(group.getName(), group);
     }
 
     public void removeGroup(long groupId) throws SQLException {
         dataManager.removeGroup(groupId);
         groupsById.remove(groupId);
+        groupsByName.remove(getGroupById(groupId).getName());
     }
 
     public boolean lookupAttributeBoolean(