[rules-users] Need help with Decision Table Conditions

[Tihomir Surdilovic]

You can view the drl from a decision table with:

SpreadsheetCompiler sc = new SpreadsheetCompiler();
String drlstr = sc.compile( 
ResourceFactory.newClassPathResource("mydecisiontable.xls").getInputStream() 
, InputType.XLS);
// print drlstr...

which helps during debugging.
Was able to produce following rule with a DT (see attached screenshot):

rule "SampleRule_11"

     when
         $pageMeta:PageMeta()
         $bodyLines : LineMeta( pageMeta == $pageMeta, lineType == 
LineType.BODY ) from $pageMeta.getLineMetas()
         $bodyLine :  LineMeta( previousPageMetaComponent != null,  
previousPageMetaComponent == previousLineMeta, previousLineMeta.lineType 
== LineType.SECTION_HEAD, verticalSpacingToPreviousPageMetaComponent < 
5.9525 ) from $bodyLines
     then
         System.out.println(123);
end

Hope this helps.
Tihomir




On 1/4/11 6:14 PM, Jason Mihalick wrote:
> I have a decision table with the conditions shown in the graphic below.  When
> Drools attempts to compile the spreadsheet I get the following errors:
>
> nested exception is java.lang.RuntimeException: Unable to return Declaration
> for identifier '$pgMeta' : [Rule name='Section Head Spacing_18']
> Unable to create restriction '[VariableRestriction: == $pgMeta ]' for field
> 'pageMeta' in the rule 'Section Head Spacing_18' : [Rule name='Section Head
> Spacing_18']
> Unable to build expression for 'from' : [Error: Failed to compile: 2
> compilation error(s):
>   - (1,7) unqualified type in strict mode for: $pgMeta
>   - (1,22) unable to resolve method using strict-mode:
> java.lang.Object.getLineMetas()]
> [Near : {... Unknown ....}]
>               ^
> [Line: 1, Column: 0] '$pgMeta.getLineMetas()' : [Rule name='Section Head
> Spacing_18']
>
>
> http://drools-java-rules-engine.46999.n3.nabble.com/file/n2195003/Picture_2.png
>
> The LHS of a hand-coded rule for this, is as follows:
>
> when
>      $pageMeta :  PageMeta()
>      $bodyLines : LineMeta( pageMeta == $pageMeta, lineType == LineType.BODY
> )
>                       from $pageMeta.getLineMetas()
>      $bodyLine :  LineMeta( previousPageMetaComponent != null,
>                             previousPageMetaComponent == previousLineMeta,
>                             previousLineMeta.lineType ==
> LineType.SECTION_HEAD,
>                             verticalSpacingToPreviousPageMetaComponent<
> 5.9525 ) from $bodyLines
>
> Can this rule be created in a Decision table or not?  Your help is most
> appreciated!
>

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