Re: [rules-users] looping in drools

i tried this : rule "new file" when FileData($old : fileOld, $new : fileNew, fileOld != fileNew) $newFile : String( this not memberOf $old ) from $new then event : Event("file added", filename, new Date()) from $plus Event.listOfEvents.add(event); event.display(); end this gives the following error: The method Event(String, File, Date) is undefined for the type Rule_new_file_0c90fff8d9b74b439ab79971b13b75ac Syntax error on token "from", ; expected $plus cannot be resolved to a type Syntax error on token ".", ; expected listOfEvents cannot be resolved On Tue, Mar 11, 2014 at 12:09 AM, Davide Sottara <dsotty(a)gmail.com&gt; wrote: > "from" will iterate for you, exactly like "accumulate" counted the > events. > If you need more details, please consult the documentation > > > > On 03/10/2014 07:29 PM, Sandhya Sree wrote: > > The problem here is even if multiple files are added, there is only one > event object created. i want to have like say if 3 new files are added, 3 > event objects must be created, and all three event objects must be added > to > List<Event> listOfEvents. > > > Thanks. > > > On Mon, Mar 10, 2014 at 11:48 PM, Davide Sottara <dsotty(a)gmail.com&gt; > wrote: > >> The "accumulates" should not be in the "then" part of a rule (see my >> previous email). >> That rule gave you two lists, in the variables $plus and $mins, that you >> can use in the consequence. >> >> If you need to process each file separately, you may want to do >> something >> like this: >> >> rule "new file" >> when >> FileData($old : fileOld, $new : fileNew, fileOld != fileNew) >> $newFile : String( this not memberOf $old ) from $new >> then >> // create new event for a new file : new Event(...) >> // add to list : Event.listOfEvents.add(...) >> end >> >> You'll need another rule for the files that have been removed. >> >> Notice that your Event class has no way to distinguish "added" from >> "removed" files, you may want to >> add a boolean or something there. >> Best >> Davide >> >> >> On 03/10/2014 07:04 PM, Sandhya Sree wrote: >> >> hi, >> im new to drools..im trying to create a project as follows. i have a >> class called Monitor which monitors a folder and creates two lists >> called >> fileOld( which is the list of filenames in that folder at time t1) and >> fileNew(which is the list of filenames in that folder at time t2). i >> have >> another class called FileData which contains two members fileOld and >> fileNew (list of strings) with getters,setters and constructor. fileOld >> and >> fileNew from Monitor Class are passed to FileData class. >> >> i also have another class called Event which is as follows: >> public class Event { >> public static String name; >> private File source; >> private Date timeStamp; >> public static List<Event> listOfEvents = new >> ArrayList<Event>(); >> >> public Event(String name, File source, Date timeStamp) { >> this.name = name; >> this.source = source; >> this.timeStamp = timeStamp; >> } >> public String getName() { >> return name; >> } >> public void setName(String name) { >> this.name = name; >> } >> public File getSource() { >> return source; >> } >> public void setSource(File source) { >> this.source = source; >> } >> public Date getTimeStamp() { >> return timeStamp; >> } >> public void setTimeStamp(Date timeStamp) { >> this.timeStamp = timeStamp; >> } >> >> now i have to compare these two lists(fileOld and fileNew) in a rule >> file and if they are not equal i have to create an event object for >> every >> file added and deleted and put it in the List<Event> listOfEvents. >> >> here is my rule file: >> >> rrule "files are equal" >> when >> FileData( fileOld == fileNew) >> then >> System.out.println("files are equal"); >> end >> >> >> rule "files not equal" >> when >> FileData($old : fileOld, $new : fileNew, fileOld != fileNew) >> >> then >> accumulate( $s : String( this not memberOf $old ) from $new, $plus : >> collectList( $s ) ) >> accumulate( $t : String( this not memberOf $new ) from $old, $mins : >> collectList( $t ) ) >> System.out.println("files added:" + $plus ); >> System.out.println( "files deleted:" + $mins ); >> end >> >> >> >> how can i loop through each of the file added or deleted and create an >> Event Class object for every file added and deleted and finally add all >> the created objects to List<Event> listOfEvents.. >> >> >> Thanks. >> >> >> _______________________________________________ >> rules-users mailing >> listrules-users@lists.jboss.orghttps://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 >> > > > > _______________________________________________ > rules-users mailing > listrules-users@lists.jboss.orghttps://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 >