@Test
public void testSimpleExpression() throws Exception {
PackageDescr pkgDescr = new PackageDescr("pkg1");
KnowledgeBuilderImpl pkgBuilder = new KnowledgeBuilderImpl();
pkgBuilder.addPackage(pkgDescr);
InternalKnowledgePackage pkg = pkgBuilder.getPackageRegistry("pkg1").getPackage();
final RuleDescr ruleDescr = new RuleDescr("rule 1");
ruleDescr.setNamespace("pkg1");
ruleDescr.setConsequence("modify (cheese) {price = 5 };\nretract (cheese)");
DialectCompiletimeRegistry dialectRegistry =
pkgBuilder.getPackageRegistry(pkg.getName()).getDialectCompiletimeRegistry();
MVELDialect mvelDialect = (MVELDialect) dialectRegistry.getDialect("mvel");
final InstrumentedBuildContent context =
new InstrumentedBuildContent(pkgBuilder, ruleDescr, dialectRegistry, pkg, mvelDialect);
final InstrumentedDeclarationScopeResolver declarationResolver =
new InstrumentedDeclarationScopeResolver();
final ObjectType cheeseObjeectType = new ClassObjectType(Cheese.class);
final Pattern pattern = new Pattern(0, cheeseObjeectType, "cheese");
final GroupElement subrule = new GroupElement(GroupElement.AND);
subrule.addChild(pattern);
final Map<String, Declaration> map = new HashMap<String, Declaration>();
map.put("cheese", pattern.getDeclaration());
declarationResolver.setDeclarations(map);
context.setDeclarationResolver(declarationResolver);
final MVELConsequenceBuilder builder = new MVELConsequenceBuilder();
builder.build(context, RuleImpl.DEFAULT_CONSEQUENCE_NAME);
InternalKnowledgeBase kBase = (InternalKnowledgeBase) KnowledgeBaseFactory.newKnowledgeBase();
PropagationContextFactory pctxFactory =
kBase.getConfiguration().getComponentFactory().getPropagationContextFactory();
kBase.addPackage(pkg);
StatefulKnowledgeSessionImpl ksession =
(StatefulKnowledgeSessionImpl) kBase.newStatefulKnowledgeSession();
final Cheese cheddar = new Cheese("cheddar", 10);
final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(cheddar);
final LeftTupleImpl tuple = new LeftTupleImpl(f0, null, true);
f0.removeLeftTuple(tuple);
final AgendaItem item =
new AgendaItemImpl(
0,
tuple,
10,
pctxFactory.createPropagationContext(1, 1, null, tuple, null),
new RuleTerminalNode(
0,
new CompositeObjectSinkAdapterTest.MockBetaNode(),
context.getRule(),
subrule,
0,
new BuildContext(kBase, null)),
null);
final DefaultKnowledgeHelper kbHelper = new DefaultKnowledgeHelper(ksession);
kbHelper.setActivation(item);
((MVELConsequence) context.getRule().getConsequence())
.compile(
(MVELDialectRuntimeData)
pkgBuilder
.getPackageRegistry(pkg.getName())
.getDialectRuntimeRegistry()
.getDialectData("mvel"));
context.getRule().getConsequence().evaluate(kbHelper, ksession);
assertEquals(5, cheddar.getPrice());
}
@Test
public void testImperativeCodeError() throws Exception {
InternalKnowledgePackage pkg = new KnowledgePackageImpl("pkg1");
final RuleDescr ruleDescr = new RuleDescr("rule 1");
ruleDescr.setConsequence("if (cheese.price == 10) { cheese.price = 5; }");
Properties properties = new Properties();
properties.setProperty("drools.dialect.default", "mvel");
KnowledgeBuilderConfigurationImpl cfg1 = new KnowledgeBuilderConfigurationImpl(properties);
KnowledgeBuilderImpl pkgBuilder = new KnowledgeBuilderImpl(pkg, cfg1);
final KnowledgeBuilderConfigurationImpl conf = pkgBuilder.getBuilderConfiguration();
PackageRegistry pkgRegistry = pkgBuilder.getPackageRegistry(pkg.getName());
DialectCompiletimeRegistry dialectRegistry =
pkgBuilder.getPackageRegistry(pkg.getName()).getDialectCompiletimeRegistry();
MVELDialect mvelDialect = (MVELDialect) dialectRegistry.getDialect(pkgRegistry.getDialect());
final InstrumentedBuildContent context =
new InstrumentedBuildContent(pkgBuilder, ruleDescr, dialectRegistry, pkg, mvelDialect);
final InstrumentedDeclarationScopeResolver declarationResolver =
new InstrumentedDeclarationScopeResolver();
final ObjectType cheeseObjeectType = new ClassObjectType(Cheese.class);
final Pattern pattern = new Pattern(0, cheeseObjeectType);
final PatternExtractor extractor = new PatternExtractor(cheeseObjeectType);
final Declaration declaration = new Declaration("cheese", extractor, pattern);
final Map<String, Declaration> map = new HashMap<String, Declaration>();
map.put("cheese", declaration);
declarationResolver.setDeclarations(map);
context.setDeclarationResolver(declarationResolver);
final MVELConsequenceBuilder builder = new MVELConsequenceBuilder();
builder.build(context, RuleImpl.DEFAULT_CONSEQUENCE_NAME);
InternalKnowledgeBase kBase = (InternalKnowledgeBase) KnowledgeBaseFactory.newKnowledgeBase();
StatefulKnowledgeSessionImpl ksession =
(StatefulKnowledgeSessionImpl) kBase.newStatefulKnowledgeSession();
final Cheese cheddar = new Cheese("cheddar", 10);
final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(cheddar);
final LeftTupleImpl tuple = new LeftTupleImpl(f0, null, true);
final AgendaItem item = new AgendaItemImpl(0, tuple, 10, null, null, null);
final DefaultKnowledgeHelper kbHelper = new DefaultKnowledgeHelper(ksession);
kbHelper.setActivation(item);
try {
((MVELConsequence) context.getRule().getConsequence())
.compile(
(MVELDialectRuntimeData)
pkgBuilder
.getPackageRegistry(pkg.getName())
.getDialectRuntimeRegistry()
.getDialectData("mvel"));
context.getRule().getConsequence().evaluate(kbHelper, ksession);
fail("should throw an exception, as 'if' is not allowed");
} catch (Exception e) {
}
assertEquals(10, cheddar.getPrice());
}