Examples with InternalReadAccessor org.drools.core.spi.InternalReadAccessor used on opensource projects

Example 1 with InternalReadAccessor

use of org.drools.core.spi.InternalReadAccessor in project drools by kiegroup.

the class KiePackagesBuilder method addQueryPattern.

private void addQueryPattern(Query query, QueryImpl queryImpl, RuleContext ctx) {
    Pattern pattern = new Pattern(ctx.getNextPatternIndex(), // offset is 0 by default
    0, ClassObjectType.DroolsQuery_ObjectType, null);
    InternalReadAccessor extractor = new LambdaReadAccessor(DroolsQuery.class, q -> ((DroolsQuery) q).getName());
    QueryNameConstraint constraint = new QueryNameConstraint(extractor, query.getName());
    pattern.addConstraint(constraint);
    queryImpl.getLhs().addChild(pattern);
    Variable<?>[] args = query.getArguments();
    Declaration[] declarations = new Declaration[args.length];
    for (int i = 0; i < args.length; i++) {
        int index = i;
        LambdaReadAccessor accessor = new LambdaReadAccessor(index, args[index].getType(), obj -> ((DroolsQuery) obj).getElements()[index]);
        declarations[i] = new Declaration(args[i].getName(), accessor, pattern, true);
        pattern.addDeclaration(declarations[i]);
        ctx.addQueryDeclaration(args[i], declarations[i]);
    }
    queryImpl.setParameters(declarations);
}

Example 2 with InternalReadAccessor

use of org.drools.core.spi.InternalReadAccessor in project drools by kiegroup.

the class KiePackagesBuilder method buildAccumulate.

private Accumulate buildAccumulate(RuleContext ctx, AccumulatePattern accPattern, RuleConditionElement source, Pattern pattern, List<String> usedVariableName, Binding binding) {
    AccumulateFunction[] accFunctions = accPattern.getAccumulateFunctions();
    Accumulate accumulate;
    if (accFunctions.length == 1) {
        final Class<?> functionClass = accFunctions[0].getFunctionClass();
        final Accumulator accumulator = createAccumulator(usedVariableName, binding, functionClass);
        final Variable boundVar = accPattern.getBoundVariables()[0];
        final Declaration declaration = new Declaration(boundVar.getName(), getReadAcessor(JAVA_CLASS_OBJECT_TYPE), pattern, true);
        pattern.addDeclaration(declaration);
        Declaration[] bindingDeclaration = binding != null ? new Declaration[0] : new Declaration[] { ctx.getPattern(accFunctions[0].getSource()).getDeclaration() };
        accumulate = new SingleAccumulate(source, bindingDeclaration, accumulator);
    } else {
        InternalReadAccessor reader = new SelfReferenceClassFieldReader(Object[].class);
        Accumulator[] accumulators = new Accumulator[accFunctions.length];
        for (int i = 0; i < accFunctions.length; i++) {
            final Class<?> functionClass = accFunctions[i].getFunctionClass();
            final Accumulator accumulator = createAccumulator(usedVariableName, binding, functionClass);
            Variable boundVar = accPattern.getBoundVariables()[i];
            pattern.addDeclaration(new Declaration(boundVar.getName(), new ArrayElementReader(reader, i, boundVar.getType()), pattern, true));
            accumulators[i] = accumulator;
        }
        accumulate = new MultiAccumulate(source, new Declaration[0], accumulators);
    }
    for (Variable boundVar : accPattern.getBoundVariables()) {
        ctx.addAccumulateSource(boundVar, accumulate);
    }
    return accumulate;
}

Example 3 with InternalReadAccessor

use of org.drools.core.spi.InternalReadAccessor in project drools by kiegroup.

the class RuleContext method getDeclaration.

Declaration getDeclaration(Variable variable) {
    if (variable.isFact()) {
        Declaration declaration = innerDeclaration.get(variable);
        if (declaration == null) {
            declaration = queryDeclaration.get(variable);
        }
        if (declaration == null) {
            Pattern pattern = patterns.get(variable);
            declaration = pattern != null ? pattern.getDeclaration() : null;
        }
        return declaration;
    } else {
        Global global = ((Global) variable);
        ObjectType objectType = builder.getObjectType(global);
        InternalReadAccessor globalExtractor = new GlobalExtractor(global.getName(), objectType);
        return new Declaration(global.getName(), globalExtractor, new Pattern(0, objectType));
    }
}

Example 4 with InternalReadAccessor

use of org.drools.core.spi.InternalReadAccessor in project drools by kiegroup.

the class TypeDeclarationConfigurator method getFieldExtractor.

private static InternalReadAccessor getFieldExtractor(TypeDeclaration type, String timestampField, InternalKnowledgePackage pkg, MVELAnalysisResult results) {
    InternalReadAccessor reader = pkg.getClassFieldAccessorStore().getMVELReader(ClassUtils.getPackage(type.getTypeClass()), type.getTypeClass().getName(), timestampField, type.isTypesafe(), results.getReturnType());
    MVELDialectRuntimeData data = (MVELDialectRuntimeData) pkg.getDialectRuntimeRegistry().getDialectData("mvel");
    data.addCompileable((MVELCompileable) reader);
    ((MVELCompileable) reader).compile(data);
    return reader;
}

Example 5 with InternalReadAccessor

use of org.drools.core.spi.InternalReadAccessor in project drools by kiegroup.

the class MVELEvalBuilderTest method testSimpleExpression.

@Test
public void testSimpleExpression() {
    InternalKnowledgePackage pkg = new KnowledgePackageImpl("pkg1");
    final RuleDescr ruleDescr = new RuleDescr("rule 1");
    KnowledgeBuilderImpl pkgBuilder = new KnowledgeBuilderImpl(pkg);
    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 InstrumentedDeclarationScopeResolver declarationResolver = new InstrumentedDeclarationScopeResolver();
    final InternalReadAccessor extractor = store.getReader(Cheese.class, "price");
    final Pattern pattern = new Pattern(0, new ClassObjectType(int.class));
    final Declaration declaration = new Declaration("a", extractor, pattern);
    final Map map = new HashMap();
    map.put("a", declaration);
    declarationResolver.setDeclarations(map);
    context.setDeclarationResolver(declarationResolver);
    final EvalDescr evalDescr = new EvalDescr();
    evalDescr.setContent("a == 10");
    final MVELEvalBuilder builder = new MVELEvalBuilder();
    final EvalCondition eval = (EvalCondition) builder.build(context, evalDescr);
    ((MVELEvalExpression) eval.getEvalExpression()).compile((MVELDialectRuntimeData) pkgBuilder.getPackageRegistry(pkg.getName()).getDialectRuntimeRegistry().getDialectData("mvel"));
    InternalKnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase();
    StatefulKnowledgeSessionImpl ksession = (StatefulKnowledgeSessionImpl) kBase.newKieSession();
    MockLeftTupleSink sink = new MockLeftTupleSink();
    final Cheese cheddar = new Cheese("cheddar", 10);
    final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(cheddar);
    final LeftTupleImpl tuple = new LeftTupleImpl(f0, sink, true);
    f0.removeLeftTuple(tuple);
    Object evalContext = eval.createContext();
    assertTrue(eval.isAllowed(tuple, ksession, evalContext));
    cheddar.setPrice(9);
    ksession.update(f0, cheddar);
    assertFalse(eval.isAllowed(tuple, ksession, evalContext));
}