use of org.drools.core.reteoo.FromNodeLeftTuple in project drools by kiegroup.
the class MVELAccumulateBuilderTest method testSimpleExpression.
@Test
public void testSimpleExpression() {
KnowledgeBuilderImpl pkgBuilder = new KnowledgeBuilderImpl();
pkgBuilder.addPackage(new PackageDescr("pkg1"));
InternalKnowledgePackage pkg = pkgBuilder.getPackage("pkg1");
final RuleDescr ruleDescr = new RuleDescr("rule 1");
final KnowledgeBuilderConfigurationImpl conf = pkgBuilder.getBuilderConfiguration();
DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry(pkg.getName()).getDialectCompiletimeRegistry();
MVELDialect mvelDialect = (MVELDialect) dialectRegistry.getDialect("mvel");
final RuleBuildContext context = new RuleBuildContext(pkgBuilder, ruleDescr, dialectRegistry, pkg, mvelDialect);
final AccumulateDescr accDescr = new AccumulateDescr();
final PatternDescr inputPattern = new PatternDescr("org.drools.mvel.compiler.Cheese", "$cheese");
accDescr.setInputPattern(inputPattern);
accDescr.setInitCode("total = 0;");
accDescr.setActionCode("total += $cheese.price;");
accDescr.setReverseCode("total -= $cheese.price;");
accDescr.setResultCode("new Integer(total)");
final MVELAccumulateBuilder builder = new MVELAccumulateBuilder();
final Accumulate acc = (Accumulate) builder.build(context, accDescr);
((MVELCompileable) acc.getAccumulators()[0]).compile((MVELDialectRuntimeData) pkgBuilder.getPackageRegistry(pkg.getName()).getDialectRuntimeRegistry().getDialectData("mvel"));
InternalKnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase();
StatefulKnowledgeSessionImpl ksession = (StatefulKnowledgeSessionImpl) kBase.newKieSession();
BuildContext buildContext = new BuildContext(kBase, Collections.emptyList());
MockLeftTupleSink sink = new MockLeftTupleSink(buildContext);
MockTupleSource source = new MockTupleSource(1, buildContext);
source.setObjectCount(1);
sink.setLeftTupleSource(source);
final Cheese cheddar1 = new Cheese("cheddar", 10);
final Cheese cheddar2 = new Cheese("cheddar", 8);
final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(new InitialFactImpl());
final InternalFactHandle f1 = (InternalFactHandle) ksession.insert(cheddar1);
final InternalFactHandle f2 = (InternalFactHandle) ksession.insert(cheddar2);
final LeftTupleImpl tuple = new LeftTupleImpl(f0, sink, true);
Object wmContext = acc.createWorkingMemoryContext();
AccumulateNode.AccumulateContext accContext = new AccumulateNode.AccumulateContext();
Object funcContext = acc.createFunctionContext();
funcContext = acc.init(wmContext, accContext, funcContext, tuple, ksession);
accContext.setFunctionContext(funcContext);
Object value1 = acc.accumulate(wmContext, accContext, tuple, f1, ksession);
acc.accumulate(wmContext, accContext, tuple, f2, ksession);
assertEquals(new Integer(18), acc.getResult(wmContext, accContext, tuple, ksession));
LeftTuple match = new FromNodeLeftTuple();
match.setContextObject(value1);
acc.tryReverse(wmContext, accContext, tuple, f1, null, match, ksession);
assertEquals(new Integer(8), acc.getResult(wmContext, accContext, tuple, ksession));
}
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