[jboss-jira] [JBoss JIRA] (DROOLS-383) switch over String in function

[Matteo Mortari (JIRA)]

Matteo Mortari created DROOLS-383:
-------------------------------------

             Summary: switch over String in function
                 Key: DROOLS-383
                 URL: https://issues.jboss.org/browse/DROOLS-383
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 6.0.0.Final
            Reporter: Matteo Mortari
            Assignee: Mark Proctor


*Executive Summary*: if I try to implement switch over String as per Java 1.7, inside of DRL function, compilation of DRL fails, but the error message would suggest that actually switch over String should work.

*Steps to reproduce*
Have a DRL file with function with String parameter and inside the function a switch over the parameter, for example
{code:title=acme.drl|borderStyle=solid}
rule "Stupid rule over String"
when
	String()
then
	System.out.println("Hello world");
end

function void theTest(String input) {
	switch(input) {
		case "Hello World" : 
			System.out.println("yep");
			break;
		default :
			System.out.println("uh");
			break;
	}
}
{code}

Have simple code to compile DRL for default KieBase, for example snippet:
{code:title=App.java|borderStyle=solid}
String input = "Hello World";
// Java 1.7
switch(input) {
	case "Hello World" : 
		System.out.println("yep");
		break;
	default :
		System.out.println("uh");
		break;
}
System.out.println( "Hello World!" );

KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieBase kieBase = kContainer.getKieBase();

for ( KiePackage kp : kieBase.getKiePackages() ) {
	for (Rule rule : kp.getRules()) {
		System.out.println("kp" + kp + " rule " + rule.getName());
	}
}
{code}

Console would log DRL compile fails with error:
{noformat}
Exception in thread "main" java.lang.RuntimeException: Error while creating KieBase[Message [id=1, level=ERROR, path=acme.drl, line=-1, column=0
   text=Error importing : 'defaultpkg.TheTest.theTest'], Message [id=2, level=ERROR, path=acme.drl, line=8, column=0
   text=[ function theTesttheTest (line:8): Cannot switch on a value of type String. Only convertible int values, strings or enum constants are permitted
 ]], Message [id=3, level=ERROR, path=acme.drl, line=1, column=0
   text=Rule Compilation error The import defaultpkg.TheTest cannot be resolved]]
{noformat}

Please notice the 'strings' bit in the error message : {{Cannot switch on a value of type String. Only convertible int values, *strings* or enum constants are permitted}}

Therefore would suggest it would compile a switch over String, but for some reason it is failing to recognize that input parameter is indeed a String?

Thank you
Ciao
MM

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