Re: [rules-users] Strategy for initializing objects

From: sonia <robotnic+drools(a)gmail.com&gt; Subject: Re: [rules-users] Strategy for initializing objects To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Saturday, August 8, 2009, 2:36 AM In general: I want to set a property in the Box objects, depending on all previously set objects.. My goal is to place the boxes one after another, for this I keep a variable in Box object. It seems like the easiest way to accumulate the sizes of boxes that are already placed. In the 'then' clause, I set the box location, and update the X by adding the size of the currently placed box. 2009/8/8 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt;: > Your goal and the presented code aren't clear to me. The consequence (after > then) contains calls to static/class methods (Box.setX()) which isn't going > to change anything in your fact object. The call b.setX() might change your > object, but this depends on what the class method Box.getX() returns. > > Assuming Drools 5, a typical consequence would look like >    b: Box(...) > then >    modify( b ){ >       setX( ... ) >    } > end > > -W > > On Sat, Aug 8, 2009 at 1:48 AM, sonia <robotnic+drools(a)gmail.com&gt; wrote: >> >> Hello >> >> I want to achieve this: >> box1.setX(0) >> box2.setX(box1.size()); >> box2.setX(box1.size + box2.size) >> ... >> >> I want to do it with rules, and would like to know what's the best >> method of initializing (or any other operation with varying data) a >> group of objects >> >> rule "init box" >>  when >>   b : Box( x == -1) >>  then >>   b.setX(Box.getX()); >>   Box.setX( Box.getX() + b.size); >> end >> >> This does not work. >> A single box object is matched several times instead of different box >> objects. >> What is happening? how come a single box object is matched several >> times? Why doesnt drools choose other instances of box? >> >> What do I need to do to initialize all boxes, once for every box? >> >> Thank you. >> >> -- >> robosonia >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- robosonia _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users