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Example 1 with MVELEvalExpression

use of org.drools.mvel.expr.MVELEvalExpression in project drools by kiegroup.

the class MVELEvalBuilder method build.

/**
 * Builds and returns an Eval Conditional Element
 *
 * @param context The current build context
 * @param descr The Eval Descriptor to build the eval conditional element from
 *
 * @return the Eval Conditional Element
 */
public RuleConditionElement build(final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {
    boolean typesafe = context.isTypesafe();
    // it must be an EvalDescr
    final EvalDescr evalDescr = (EvalDescr) descr;
    try {
        MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
        Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
        AnalysisResult analysis = context.getDialect().analyzeExpression(context, evalDescr, evalDescr.getContent(), new BoundIdentifiers(DeclarationScopeResolver.getDeclarationClasses(decls), context));
        final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
        int i = usedIdentifiers.getDeclrClasses().keySet().size();
        Declaration[] previousDeclarations = new Declaration[i];
        i = 0;
        for (String id : usedIdentifiers.getDeclrClasses().keySet()) {
            previousDeclarations[i++] = decls.get(id);
        }
        Arrays.sort(previousDeclarations, SortDeclarations.instance);
        MVELCompilationUnit unit = dialect.getMVELCompilationUnit((String) evalDescr.getContent(), analysis, previousDeclarations, null, null, context, "drools", KnowledgeHelper.class, false, MVELCompilationUnit.Scope.EXPRESSION);
        final EvalCondition eval = EvalConditionFactory.Factory.get().createEvalCondition(previousDeclarations);
        MVELEvalExpression expr = new MVELEvalExpression(unit, dialect.getId());
        eval.setEvalExpression(KiePolicyHelper.isPolicyEnabled() ? new SafeEvalExpression(expr) : expr);
        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
        data.addCompileable(eval, expr);
        expr.compile(data, context.getRule());
        return eval;
    } catch (final Exception e) {
        copyErrorLocation(e, evalDescr);
        context.addError(new DescrBuildError(context.getParentDescr(), evalDescr, e, "Unable to build expression for 'eval':" + e.getMessage() + " '" + evalDescr.getContent() + "'"));
        return null;
    } finally {
        context.setTypesafe(typesafe);
    }
}
Also used : MVELCompilationUnit(org.drools.mvel.expr.MVELCompilationUnit) AnalysisResult(org.drools.compiler.compiler.AnalysisResult) EvalCondition(org.drools.core.rule.EvalCondition) MVELEvalExpression(org.drools.mvel.expr.MVELEvalExpression) BoundIdentifiers(org.drools.compiler.compiler.BoundIdentifiers) MVELDialectRuntimeData(org.drools.mvel.MVELDialectRuntimeData) DescrBuildError(org.drools.compiler.compiler.DescrBuildError) EvalDescr(org.drools.drl.ast.descr.EvalDescr) Declaration(org.drools.core.rule.Declaration) SafeEvalExpression(org.drools.core.spi.EvalExpression.SafeEvalExpression)

Example 2 with MVELEvalExpression

use of org.drools.mvel.expr.MVELEvalExpression in project drools by kiegroup.

the class MVELEvalBuilderTest method testSimpleExpression.

@Test
public void testSimpleExpression() {
    InternalKnowledgePackage pkg = CoreComponentFactory.get().createKnowledgePackage("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();
    BuildContext buildContext = new BuildContext(kBase, Collections.emptyList());
    org.drools.core.reteoo.MockLeftTupleSink sink = new MockLeftTupleSink(buildContext);
    MockTupleSource source = new MockTupleSource(1, buildContext);
    source.setObjectCount(1);
    sink.setLeftTupleSource(source);
    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));
}
Also used : ClassObjectType(org.drools.core.base.ClassObjectType) KnowledgeBuilderConfigurationImpl(org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl) HashMap(java.util.HashMap) MockLeftTupleSink(org.drools.core.reteoo.MockLeftTupleSink) Cheese(org.drools.mvel.compiler.Cheese) EvalCondition(org.drools.core.rule.EvalCondition) MockTupleSource(org.drools.core.reteoo.MockTupleSource) EvalDescr(org.drools.drl.ast.descr.EvalDescr) InternalReadAccessor(org.drools.core.spi.InternalReadAccessor) MVELEvalBuilder(org.drools.mvel.builder.MVELEvalBuilder) LeftTupleImpl(org.drools.core.reteoo.LeftTupleImpl) Declaration(org.drools.core.rule.Declaration) InternalFactHandle(org.drools.core.common.InternalFactHandle) InternalKnowledgeBase(org.drools.kiesession.rulebase.InternalKnowledgeBase) Pattern(org.drools.core.rule.Pattern) RuleBuildContext(org.drools.compiler.rule.builder.RuleBuildContext) DialectCompiletimeRegistry(org.drools.compiler.compiler.DialectCompiletimeRegistry) MVELDialect(org.drools.mvel.builder.MVELDialect) MVELEvalExpression(org.drools.mvel.expr.MVELEvalExpression) MockLeftTupleSink(org.drools.core.reteoo.MockLeftTupleSink) BuildContext(org.drools.core.reteoo.builder.BuildContext) RuleBuildContext(org.drools.compiler.rule.builder.RuleBuildContext) KnowledgeBuilderImpl(org.drools.compiler.builder.impl.KnowledgeBuilderImpl) StatefulKnowledgeSessionImpl(org.drools.kiesession.session.StatefulKnowledgeSessionImpl) RuleDescr(org.drools.drl.ast.descr.RuleDescr) HashMap(java.util.HashMap) Map(java.util.Map) InternalKnowledgePackage(org.drools.core.definitions.InternalKnowledgePackage) Test(org.junit.Test)

Aggregations

Declaration (org.drools.core.rule.Declaration)2 EvalCondition (org.drools.core.rule.EvalCondition)2 EvalDescr (org.drools.drl.ast.descr.EvalDescr)2 MVELEvalExpression (org.drools.mvel.expr.MVELEvalExpression)2 HashMap (java.util.HashMap)1 Map (java.util.Map)1 KnowledgeBuilderConfigurationImpl (org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl)1 KnowledgeBuilderImpl (org.drools.compiler.builder.impl.KnowledgeBuilderImpl)1 AnalysisResult (org.drools.compiler.compiler.AnalysisResult)1 BoundIdentifiers (org.drools.compiler.compiler.BoundIdentifiers)1 DescrBuildError (org.drools.compiler.compiler.DescrBuildError)1 DialectCompiletimeRegistry (org.drools.compiler.compiler.DialectCompiletimeRegistry)1 RuleBuildContext (org.drools.compiler.rule.builder.RuleBuildContext)1 ClassObjectType (org.drools.core.base.ClassObjectType)1 InternalFactHandle (org.drools.core.common.InternalFactHandle)1 InternalKnowledgePackage (org.drools.core.definitions.InternalKnowledgePackage)1 LeftTupleImpl (org.drools.core.reteoo.LeftTupleImpl)1 MockLeftTupleSink (org.drools.core.reteoo.MockLeftTupleSink)1 MockTupleSource (org.drools.core.reteoo.MockTupleSource)1 BuildContext (org.drools.core.reteoo.builder.BuildContext)1