Examples with MVELConsequence org.drools.mvel.expr.MVELConsequence used on opensource projects

Example 1 with MVELConsequence

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

the class MVELConsequenceBuilder method build.

public void build(final RuleBuildContext context, String consequenceName) {
    // pushing consequence LHS into the stack for variable resolution
    context.getDeclarationResolver().pushOnBuildStack(context.getRule().getLhs());
    try {
        MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
        final RuleDescr ruleDescr = context.getRuleDescr();
        String text = (RuleImpl.DEFAULT_CONSEQUENCE_NAME.equals(consequenceName)) ? (String) ruleDescr.getConsequence() : (String) ruleDescr.getNamedConsequences().get(consequenceName);
        text = processMacros(text);
        text = rewriteModify(text);
        Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
        AnalysisResult analysis = dialect.analyzeBlock(context, text, new BoundIdentifiers(DeclarationScopeResolver.getDeclarationClasses(decls), context, Collections.EMPTY_MAP, KnowledgeHelper.class), null, "drools", KnowledgeHelper.class);
        if (analysis == null) {
            // something bad happened, issue already logged in errors
            return;
        }
        text = rewriteUpdates(context, analysis, text);
        final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
        final Declaration[] declarations = new Declaration[usedIdentifiers.getDeclrClasses().size()];
        String[] declrStr = new String[declarations.length];
        int j = 0;
        for (String str : usedIdentifiers.getDeclrClasses().keySet()) {
            declrStr[j] = str;
            declarations[j++] = decls.get(str);
        }
        Arrays.sort(declarations, SortDeclarations.instance);
        for (int i = 0; i < declrStr.length; i++) {
            declrStr[i] = declarations[i].getIdentifier();
        }
        context.getRule().setRequiredDeclarationsForConsequence(consequenceName, declrStr);
        MVELCompilationUnit unit = dialect.getMVELCompilationUnit(text, analysis, declarations, null, null, context, "drools", KnowledgeHelper.class, false, MVELCompilationUnit.Scope.CONSEQUENCE);
        MVELConsequence expr = new MVELConsequence(unit, dialect.getId(), consequenceName);
        if (RuleImpl.DEFAULT_CONSEQUENCE_NAME.equals(consequenceName)) {
            context.getRule().setConsequence(expr);
        } else {
            context.getRule().addNamedConsequence(consequenceName, expr);
        }
        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
        data.addCompileable(context.getRule(), expr);
        expr.compile(data, context.getRule());
    } catch (final Exception e) {
        copyErrorLocation(e, context.getRuleDescr());
        context.addError(new DescrBuildError(context.getParentDescr(), context.getRuleDescr(), null, "Unable to build expression for 'consequence': " + e.getMessage() + " '" + context.getRuleDescr().getConsequence() + "'"));
    }
}

Example 2 with MVELConsequence

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

the class MVELConsequenceBuilderTest method testImperativeCodeError.

@Test
public void testImperativeCodeError() throws Exception {
    InternalKnowledgePackage pkg = CoreComponentFactory.get().createKnowledgePackage("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);
    PackageRegistry pkgRegistry = pkgBuilder.getPackageRegistry(pkg.getName());
    DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry(pkg.getName()).getDialectCompiletimeRegistry();
    MVELDialect mvelDialect = (MVELDialect) dialectRegistry.getDialect(pkgRegistry.getDialect());
    final RuleBuildContext context = new RuleBuildContext(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 = KnowledgeBaseFactory.newKnowledgeBase();
    StatefulKnowledgeSessionImpl ksession = (StatefulKnowledgeSessionImpl) kBase.newKieSession();
    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());
}

Example 3 with MVELConsequence

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

the class MVELDebugTest method testDebug.

@Test
public void testDebug() throws Exception {
    String rule = "package com.sample; dialect \"mvel\" rule myRule when then\n System.out.println( \"test\" ); end";
    KnowledgeBuilderImpl builder = new KnowledgeBuilderImpl();
    DrlParser parser = new DrlParser(LanguageLevelOption.DRL5);
    PackageDescr packageDescr = parser.parse(null, rule);
    RuleDescr ruleDescr = packageDescr.getRules().get(0);
    builder = new KnowledgeBuilderImpl();
    builder.addPackage(packageDescr);
    InternalKnowledgePackage pkg = builder.getPackage("com.sample");
    MVELConsequence consequence = (MVELConsequence) pkg.getRule("myRule").getConsequence();
    String ruleName = ruleDescr.getNamespace() + "." + ruleDescr.getClassName();
    System.out.println(ruleName);
    assertEquals("com.sample.Rule_myRule", ruleName);
}

Example 4 with MVELConsequence

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

the class MVELConsequenceBuilderTest method testSimpleExpression.

@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 RuleBuildContext context = new RuleBuildContext(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 = KnowledgeBaseFactory.newKnowledgeBase();
    PropagationContextFactory pctxFactory = RuntimeComponentFactory.get().getPropagationContextFactory();
    kBase.addPackage(pkg);
    StatefulKnowledgeSessionImpl ksession = (StatefulKnowledgeSessionImpl) kBase.newKieSession();
    BuildContext buildContext = new BuildContext(kBase, Collections.emptyList());
    MockTupleSource source = new MockTupleSource(1, buildContext);
    source.setObjectCount(1);
    RuleTerminalNode rtn = new RuleTerminalNode(0, source, context.getRule(), subrule, 0, buildContext);
    final Cheese cheddar = new Cheese("cheddar", 10);
    final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(cheddar);
    final LeftTupleImpl tuple = new LeftTupleImpl(f0, rtn, true);
    f0.removeLeftTuple(tuple);
    final AgendaItem item = new AgendaItemImpl(0, tuple, 10, pctxFactory.createPropagationContext(1, PropagationContext.Type.DELETION, null, null, null), rtn, 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());
}

Example 5 with MVELConsequence

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

the class MVELConsequenceBuilderTest method testMVELDebugSymbols.

@Test
public void testMVELDebugSymbols() throws DroolsParserException {
    MVELDebugHandler.setDebugMode(true);
    try {
        final DrlParser parser = new DrlParser(LanguageLevelOption.DRL5);
        final PackageDescr pkgDescr = parser.parse(new InputStreamReader(getClass().getResourceAsStream("mvel_rule.drl")));
        // just checking there is no parsing errors
        assertFalse(parser.getErrors().toString(), parser.hasErrors());
        InternalKnowledgePackage pkg = CoreComponentFactory.get().createKnowledgePackage("org.drools");
        final RuleDescr ruleDescr = pkgDescr.getRules().get(0);
        final KnowledgeBuilderImpl pkgBuilder = new KnowledgeBuilderImpl(pkg);
        DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry(pkg.getName()).getDialectCompiletimeRegistry();
        Dialect dialect = dialectRegistry.getDialect("mvel");
        RuleBuildContext context = new RuleBuildContext(pkgBuilder, ruleDescr, dialectRegistry, pkg, dialect);
        RuleBuilder.build(context);
        assertTrue(context.getErrors().toString(), context.getErrors().isEmpty());
        final RuleImpl rule = context.getRule();
        MVELConsequence mvelCons = (MVELConsequence) rule.getConsequence();
        mvelCons.compile((MVELDialectRuntimeData) pkgBuilder.getPackageRegistry(pkg.getName()).getDialectRuntimeRegistry().getDialectData("mvel"));
        String s = DebugTools.decompile(mvelCons.getCompExpr());
        int fromIndex = 0;
        int count = 0;
        while ((fromIndex = s.indexOf("DEBUG_SYMBOL", fromIndex + 1)) > -1) {
            count++;
        }
        assertEquals(4, count);
    } finally {
        MVELDebugHandler.setDebugMode(false);
    }
}