Thanks for the inputs, Mark.
I just modified the Helloworld example to try this out. I added a collection
to the Message class:
public static class Message {
public static final int HELLO = 0;
public static final int GOODBYE = 1;
private String message;
private int status;
private List headers = new ArrayList();
public void setHeaders(List test) {
//ignore the param as of now
headers.add("hello header1");
headers.add("hello header2");
}
public List getHeaders() {
return this.headers;
}
.
}
And then changed the rule to:
rule "Hello World"
when
m : (Message (headers contains "hello header1" || contains
"hello header2"))
then
System.out.println( "bye" );
End
However, the rule compilation fails with this error:
org.drools.rule.InvalidRulePackage: unknown:7:49 Unexpected token '||'
unknown:7:53 mismatched token: [EMAIL
PROTECTED],170:177='contains',<49>,7:53]; expecting type ID
unknown:8:1 mismatched token: [EMAIL PROTECTED],199:202='then',<33>,8:1];
expecting type '('
unknown:10:2 mismatched token: [EMAIL PROTECTED],211:216='System',<5>,10:2];
expecting type ')'
at org.drools.rule.Package.checkValidity(Unknown Source)
at org.drools.common.AbstractRuleBase.addPackage(Unknown Source)
at
org.drools.examples.HelloWorldExample.readRule(HelloWorldExample.java:65)
at org.drools.examples.HelloWorldExample.main(HelloWorldExample.java:23)
I tried out a few more combinations with the || constraint, but each time it
failed with similar errors complaining about the token.
Anything that I am doing incorrectly, here? I am using 3.0.6 version.
Regards,
-Jaikiran
Mark Proctor <[EMAIL PROTECTED]> wrote: using 'or' like that results in
subrule generation, i.e. rules will fire for all matching combinatinos - this
is not what people normally want. you can also do it using field constraints
person : (Person (interests contains "Golf" || contains "Soccer")
Jaikiran Pai wrote: Hi,
This is a very newbie question. I have a Person object which contains a
collection named "interests". This collection will contain the activities that
the Person is interested in. If the person is interested in Golf, Soccer and
Baseball, then this collection will contain these 3 strings. I am trying to
write a rule which checks whether a person is interested in Soccer OR Golf and
if he's interested then do further logic. I looked at the documentation for
Drools syntax, and looks like this is how i have to write the rule:
rule Testing
when
person : (Person (interests contains "Golf") or Person (interests contains
"Soccer") )
then
System.out.println("I am interested");
end
Is this the correct way to do this? Is there a simpler construct like:
person : Person (interests contains "Golf" or interests contains "Soccer" )
I was thinking on the lines of the "," (and) operator :
person : Person (interests contains "Golf", interests contains "Soccer" )
Thank you.
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