Design Pattern: Working with Groups in Rules

[skatun (Kim Skatun)]

group.members.forEach[ i | if i.memberOf( sceneGroup) { i.sendCommand(ON) else{ i.sendCommand(OFF) } ]

Rule ‘Update lights’: ‘memberOf’ is not a member of ‘org.eclipse.smarthome.core.items.Item’; line 37, column 8, length 22

[skatun (Kim Skatun)]

sceneGroup.members.filter[ j | j.name == i.name].size > 0

That works, I assume its a bit slow if you have big groups…

[5iver (Scott Rushworth)]

group.members.forEach[ i |
        if i.memberOf( sceneGroup) {
            i.sendCommand(ON)
        else{
          i.sendCommand(OFF)
        }
        ]

group.members.forEach[ i |
    if (i.getGroupNames.contains("sceneGroup") {
        i.sendCommand(ON)
    else {
        i.sendCommand(OFF)
    }
]

[skatun (Kim Skatun)]

So after several testing now, here is the conclusion:

1. if i.memberOf( sceneGroup) { FAILS
2. sceneGroup.members.filter[ j | j.name == i.name].size > 0 SLOW
3. if (i.getGroupNames.contains(sceneGroup.name) { FAST

@5iver thanks for the tip, however you had a small typo:

 if (i.getGroupNames.contains("sceneGroup") {

should be

 if (i.getGroupNames.contains(sceneGroup.name) {

@rlkoshak maybe you can add this method to your orginal post of how to find out if an item is a member of a group.

[5iver (Scott Rushworth)]

 if (i.getGroupNames.contains("sceneGroup") {

should be

 if (i.getGroupNames.contains(sceneGroup.name) {

Huh? sceneGroup.name equals “sceneGroup”.

[skatun (Kim Skatun)]

Not quite: sceneGroup.name can be like this…

Group Group_Livingroom_Lights_Kitchen
Group Group_Livingroom_Lights_Lounge

See my design pattern for more info.

Magical light scenes

Introduction This is the lighting tutorial (DESIGN PATTERN) which is a part of my tutorial list, I keep coming back to them, improving them add functionality to them etc, so if you like it then hit “like” it and you will get notified when changes occurs. I would like to thanks @rlkoshak for the help with this one. Please see Design Pattern: What is a Design Pattern and How Do I Use Them for details on what a DP is and how to use them. FIRST DRAFT Please keep in mind that the tutorial is not…

[shutterfreak (Olivier Biot)]

• MyGroup.members : get a Set of all the members of the Group, GroupItems that are also members are part of the set
• MyGroup.allMembers : get a Set of all the members of the Group and all members of subgroups; the subgroup GroupItems are not included, only their members

The former should be: all the direct members of the Group. In other words, if you define:

Group grpA
Group grpB (grpA)
Group grpC (grpA)

String strA (grpA)
String strB (grpB)
String strC (grpC)

Then grpA.members returns the following items:

• grpB
• grpC
• strA

And grpA.allMembers returns only non-group items by resolving all groups into their items. In the example above, grpA.allMembers returns the following items:

• strA
• strB
• strC

[GordanTrevis (Gordan)]

How would you archive this in Jython?

Im trying to get all members of a GroupA which are also members of GroubB.
Without Iterating over 100 of items.

=> Say All “gTemperatures” in “gLivingroom” - Same as the Doc Group Example from “Items”.

// Example Item
Number Livingroom_Temperature "Temperature [%.1f °C]" (Livingroom, Temperatures)

[Ron (Philipp “Ron” O)]

I never used Jython myself (although I will probably start to in the near future), but I think you can just use two list comprehensions to achieve this (somebody correct me if I am wrong with this ):

temperature_list = [i.name for i in ir.getItem('gTemperatures').members]
livingroom_temperatures = [i for i in ir.getItem('gLivingroom').members if i.name in temperature_list]

you could also make two sets out of your groups and intersect them.

[5iver (Scott Rushworth)]

I answered someone else a couple days ago (I’ll add this to the docs)…

Accesing all JSR223/Jython Item Values

This may be helpful for you… I don’t know about better, but a list comprehension will work too… def getfromgroup(locationgroup, functionalgroup): return [item for item in itemRegistry.getItem(locationgroup).members if item in itemRegistry.getItem(functionalgroup).members] Thank you… contributions are always welcome! There are 54 attributes and methods for a GroupItem. The helper library repo is not the proper place for them to be documented, since they do not have anything to do with …

Here are a couple more examples that will be in the helper library docs…

        list_of_items = [item for item in itemRegistry.getItem("gDS_FamilyRoom").members if "gMotion_Sensor" in item.groupNames]

        # or
        list_of_items = [item for item in itemRegistry.getItem("gDS_FamilyRoom").members if item in itemRegistry.getItem("gMotion_Sensor").members]

        # or
        list_of_items = [item for item in itemRegistry.getItem("gMotion_Sensor").members if item in itemRegistry.getItem("gDownstairs").allMembers]

[thisisIO (Michael)]

Hello,

thanks for Pattern!
I have put all items in test.items file and unfortunatly i get error

2019-12-05 12:44:50.050 [WARN ] [el.core.internal.ModelRepositoryImpl] - Configuration model 'test.items' has errors, therefore ignoring it: [7,57]: missing EOF at '('

It goes away only if i delete all the “(gDoorsTimers)” from file.
Pi4 OH2.5 M5
What can it be?
Thanks!

[rossko57]

There’s something wrong in your rules file that we cannot see from here. I’ll guess it may be a copy-paste problem about quotemarks

Spot the difference in highlighting -

fred=“some text”
mary="more text"

You must use the correct type of “plain” quotemarks in xxx.items files.

[thisisIO (Michael)]

I have copy-pasted the items from the top

Group:Contact:OR(OPEN, CLOSED) gDoorSensors "The doors are [%s]"
Group:DateTime:MAX gDoorsLast "The last door event was [%1$tm/%1$td %1$tH:%1$tM]" 
Group:Switch:OR(ON, OFF) gDoorsTimers

Contact vGarageOpener1 "Garage Door Opener 1 is [%s]" (gDoorsSensors)
DateTime vGarageOpener1_LastUpdate "Garage Door Opener 1 [%1$tm/%1$td %1$tH:%1$tM]" (gDoorsLast)
Switch vGarageOpener1_Timer { expire="1h,command=OFF" } (gDoorsSensors)

Contact vGarageOpener2 "Garage Door Opener 2 is [%s]" (gDoorsSensors)
DateTime vGarageOpener2_LastUpdate "Garage Door Opener 2 [%1$tm/%1$td %1$tH:%1$tM]" (gDoorsLast)
Switch vGarageOpener2_Timer { expire="1h,command=OFF" } (gDoorsTimers)

Contact vFrontDoor "Front Door is [%s]" (gDoorsSensors)
DateTime vFrontDoor_LastUpdate "Front Door [%1$tm/%1$td %1$tH:%1$tM]" (gDoorsLast)
Switch vFrontDoor_Timer { expire="1h,command=OFF" } (gDoorsTimers)

Contact vBackDoor "Back Door is [%s]" (gDoorsSensors)
DateTime vBackDoor_LastUpdate "Back Door [%1$tm/%1$td %1$tH:%1$tM]" (gDoorsLast)
Switch vBackDoor_Timer { expire="1h,command=OFF" } (gDoorsTimers)

Contact vGarageDoor "Garage Door is [%s]" (gDoorsSensors)
DateTime vGarageDoor_LastUpdate "Garage Door [%1$tm/%1$td %1$tH:%1$tM]" (gDoorsLast)
Switch vGarageDoor_Timer { expire="1h,command=OFF" } (gDoorsTimers) 

they looks good

[thisisIO (Michael)]

It seems to be a wrong Syntax in item definition (at least in 2.5 M5). Should be chaned in the top of the post!

Error:

Switch vGarageOpener1_Timer { expire="1h,command=OFF" } (gDoorsSensors)

OK:

Switch vGarageOpener1_Timer (gDoorsSensors) { expire="1h,command=OFF" }

[rossko57]

Well, it’s only an example, you’ll probably need to work your own up. But -

Switch vGarageOpener1_Timer { expire=“1h,command=OFF” } (gDoorsSensors)

This wrong format. The (groups) need to be placed before the {bindings}.
It’s always been that way, but I expect the Items file parser has incorporated more checks since 2017

Switch vGarageOpener1_Timer (gDoorsSensors) { expire="1h,command=OFF" }

EDIT - okay you found it. @rlkoshak for info

[thisisIO (Michael)]

One more small mistake with whitch iэму spent half an hour (((
Better to correct, so other can use the pattern.

Screenshot

And in Rules also

Screenshot

[thisisIO (Michael)]

This construction

val lastChange=gDoorsSensors.members.findFirst[ t | t.name == "DoorEntranceLastChange" ] as DateTimeItem
logInfo("Door", "val opened at:  " + lastChange + "check: " +  DoorEntranceLastChange.state)

seems not ot work on OH 2.5M5 or i made smth wrong?

i get

2019-12-05 18:22:16.089 [INFO ] [.eclipse.smarthome.model.script.Door] - val opened at:  nullcheck: 2019-12-05T18:22:14.957+0100

Why null, item has DateTime and not null at this time

DateTime  DoorEntranceLastChange "Door Entrance Last Change [%1$td.%1$tm.%1$tY %1$tH:%1$tM:%1$tS]"

[rlkoshak (Rich Koshak)]

Thank you for pointing out the errors. As rossko57 points out, the example never was intended to be copied from the posting and used. It shows how to use the operations discussed but you would be expected to apply those operations to your own Items and Groups.

In some cases, there are better ways to achieve the same thing, sometimes without Rules at all, e.g. there is a Profile to update the LastUpdate Items.

This construction

Please don’t double post. I’ve answered on the other thread.

[thisisIO (Michael)]

Thank you for pointing out the errors. As rossko57 points out, the example never was intended to be copied from the posting and used. It shows how to use the operations discussed but you would be expected to apply those operations to your own Items and Groups.

I thought that other members can save time using Pattern out of box)

Please don’t double post. I’ve answered on the other thread.

Of course! Sorry. Sitting with it foк 4 hours, a little bit tired(((

[rlkoshak (Rich Koshak)]

I thought that other members can save time using Pattern out of box)

See Design Pattern: What is a Design Pattern and How Do I Use Them.

A DP is a general and reusable solution to a common problem. But the solution is not complete. Instead it is a template that one can apply to a lot of different situations with minor modifications and customizations.

This particular DP is also a little different and probably should never have been a DP in the first place. Frankly, what it is is some reference documentation missing from the Xtend docs for how to manipulate collections. It’s not so much a DP as it is a reference guide. As such, the example is just that, and example. It was never intended to be something someone copies and uses line for line. Some of the other DPs do in fact have examples that could be copied and used line for line though, assuming that the example is useful to you. But even then it is unlikely to be useful “out-of-the-box”. The examples are there to illustrate how to solve a common problem. Rarely will you find any example on the forum, DP or otherwise, that you can just use without modification.

The example above though is mainly for illustrative purposes, to show some of those operations in context. That’s probably why the errors you found haven’t been found by others in the three + years this DP has been posted.