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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There were a couple of ways mentioned in the Drools
documentation for 4.0.7.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Eval is the Quick way to get this done. This does have a performance
penalty though<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Read up on using the -> operator that allowed you to go
deeper into the object hierarchy. <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>A third way which I used was to write setter and getter methods
for fields I needed in the rules condition in the root class itself. Since
Drools introspects on setters and getters this seemed to work. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>To take an example, if I have a class as follows:-<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Class B{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>int a;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>public int geta() {};<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>public int seta() {};<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Class A {<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>B b;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>public int getA()<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Return this.b.geta();<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Public void seta(int b)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>this.b.seta(b);<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <b>On Behalf Of </b>Divya
Rajendranath<br>
<b>Sent:</b> Monday, February 23, 2009 2:57 PM<br>
<b>To:</b> rules-users@lists.jboss.org<br>
<b>Subject:</b> [rules-users] Help on using Drools with embedded objects<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p><span style='font-size:10.0pt'>Hi, <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>I am planning to use Drools - JBoss Rules
Engine. My requirement is to disburse mails from my application to different
groups based on various criteria. I want to use Drools here.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>My object structure is as follows:<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>class A{<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>String B = "";<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>B b;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>C c;<br>
}<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Hence Obj A has embedded objects within it,
and obj B and C further has embedded objects.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>class B {<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>String X;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Z z;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>}<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>class Z{<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>String t;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>String s;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>}<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>The decision on sending the mails based on
the fields in embedded objects of A. I pass instance of A to Drools<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Format of drl file:<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>package...;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>import ..;<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>rule "Test"<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>when $a:A(B(Z(s == "testvalue")))<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>then<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>$a.setSomething();<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>update($a);<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>end<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>I wanted to know if this (accessing fields in
embedded/child object) is feasible with Drools.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>I get an error saying "UNable to compile
myfile.drl when i try to fo this.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Could some one look into this issue and let
me know the reason for this ?<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Thanks<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>-D<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
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