Rules DSL Binary 'AND' operations

[Morgano (Jeremy Morgan)]

I’m trying to do some bit manipulation in a DSL Rules script.

rule "Test Rule"
when
    Item Something changed
then
    var int i1 = -2147457441

    var int i2 = i1 & 0x0FFFFFFF

    // then do something with them...
end

However, the Rules DSL doesn’t appear to like the ‘&’ operator and I get this error:

2021-02-08 18:47:27.988 [WARN ] [el.core.internal.ModelRepositoryImpl] - Configuration model 'rulefile.rules' has errors, therefore ignoring it: [207,15]: no viable alternative at input 'i1'

The line number refers to the line with the attempted ‘&’ operation.

Does anyone know how I can achieve this in Rules DSL?

[rossko57]

I think this old post is still relevant.

[Solved] Binary Operations in Rules

I suspect the single pipe is breaking everything. Did you intend || for OR? That would always return true though. Unfortunately this is not Java, rules are written in a OH specific version of Xtend. Mostly very like Java. But distinctly quirky so far as handling Numbers bitwise goes. Googling for OpenHAB bitwise throws up tidbits worth reading, example https://groups.google.com/forum/#!topic/openhab/z4cYibhnoHc

No bitwise operators, use instead methods of the variable.

var Integer i1 = -2147457441
var Integer i2 = i1.bitwiseAnd(0x0FFFFFFF)

[Morgano (Jeremy Morgan)]

@rossko57

No bitwise operators, use instead methods of the variable.

var Integer i1 = -2147457441
var Integer i2 = i1.bitwiseAnd(0x0FFFFFFF)

@rossko57 Thanks for the info - that worked! I found that the primitives worked too e.g.

var int i1 = -2147457441
var int i2 = i1.bitwiseAnd(0x0FFFFFFF)

[rossko57]

For some odd reason in the interpreter bowels, the use of primitives can impact DSL performance and use is best kept to the minimum.

[peter_tau (Peter)]

Dear Community,

The example above with the bitwiseAnd operation on Integer variables works also fine on my setup of OpenHab 3.0.1. However, I fail to adapt this example to apply a bitwise and operation to a received number state.

val Number HvacState = APPEG_Zimmer_Betriebsartstatus_HVAC.state as Number
var Integer HvacMode = HvacState.bitwiseAnd(0x0F)

The result is:

2021-03-21 12:43:00.157 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID 'knx-1' failed: 'bitwiseAnd' is not a member of 'java.lang.Number'; line 11, column 26, length 25 in knx

I am not familiar with the proper casting of states. When I try to read the state as integer, I receive a different error message…

Does anybody has a hint as how to properly apply bitwise operations onto received number states?

Best regards,
Peter

[rossko57]

@peter_tau

val Number HvacState = APPEG_Zimmer_Betriebsartstatus_HVAC.state as Number

Number type doesn’t have a bitwise method. Try

val HvacState = (APPEG_Zimmer_Betriebsartstatus_HVAC.state as Number).intValue

[peter_tau (Peter)]

Dear Rossko57,

Thank you very much for your hint. Unfortunately, I receive a slightly different error message when applying the suggested change:

	[line 38] val HvacState = (APPEG_Bad_Betriebsartstatus_HVAC.state as Number).intvalue
	[line 39] var Integer HvacMode = HvacState.bitwiseAnd(0x0F)

The result is:

2021-03-21 14:42:19.480 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID 'knx-2' failed: 'intvalue' is not a member of 'java.lang.Number'; line 38, column 18, length 59 in knx

Best regards,
Peter

[rossko57]

All this stuff is case sensitive

@rossko57

).intValue

@peter_tau

).intvalue

[peter_tau (Peter)]

Thank you very much for your hint!