Examples with Variable org.drools.model.Variable used on opensource projects

Example 66 with Variable

use of org.drools.model.Variable in project drools by kiegroup.

the class KiePackagesBuilder method addConstraintsToPattern.

private void addConstraintsToPattern(RuleContext ctx, Pattern pattern, org.drools.model.Pattern modelPattern, Constraint constraint) {
    if (constraint.getType() == Constraint.Type.SINGLE) {
        SingleConstraint singleConstraint = (SingleConstraint) constraint;
        boolean isEqual = singleConstraint.getIndex() != null && singleConstraint.getIndex().getConstraintType() == Index.ConstraintType.EQUAL;
        if (singleConstraint.getVariables().length > 0) {
            Variable[] vars = singleConstraint.getVariables();
            Declaration[] declarations = new Declaration[vars.length];
            Declaration unificationDeclaration = null;
            for (int i = 0; i < vars.length; i++) {
                declarations[i] = ctx.getDeclaration(vars[i]);
                if (isEqual && declarations[i].getPattern().getObjectType().equals(ClassObjectType.DroolsQuery_ObjectType)) {
                    unificationDeclaration = declarations[i];
                } else if (pattern.getSource() instanceof MultiAccumulate) {
                    Declaration accDeclaration = pattern.getDeclarations().get(declarations[i].getBindingName());
                    if (accDeclaration != null) {
                        declarations[i].setReadAccessor(accDeclaration.getExtractor());
                    }
                }
            }
            ConstraintEvaluator constraintEvaluator = singleConstraint.isTemporal() ? new TemporalConstraintEvaluator(declarations, pattern, singleConstraint) : new ConstraintEvaluator(declarations, pattern, singleConstraint);
            org.drools.core.spi.Constraint droolsConstraint = unificationDeclaration != null ? new UnificationConstraint(unificationDeclaration, constraintEvaluator) : new LambdaConstraint(constraintEvaluator);
            pattern.addConstraint(droolsConstraint);
        }
    } else if (modelPattern.getConstraint().getType() == Constraint.Type.AND) {
        for (Constraint child : constraint.getChildren()) {
            addConstraintsToPattern(ctx, pattern, modelPattern, child);
        }
    }
}

Example 67 with Variable

use of org.drools.model.Variable in project drools by kiegroup.

the class KiePackagesBuilder method buildQueryPattern.

private RuleConditionElement buildQueryPattern(RuleContext ctx, QueryCallPattern queryPattern) {
    Pattern pattern = new Pattern(ctx.getNextPatternIndex(), 0, ClassObjectType.ObjectArray_ObjectType, null);
    InternalReadAccessor arrayReader = new SelfReferenceClassFieldReader(Object[].class);
    QueryArgument[] arguments = new QueryArgument[queryPattern.getArguments().length];
    List<Integer> varIndexList = new ArrayList<>();
    List<Declaration> requiredDeclarations = new ArrayList<>();
    for (int i = 0; i < queryPattern.getArguments().length; i++) {
        Argument arg = queryPattern.getArguments()[i];
        if (arg instanceof Variable) {
            Variable var = ((Variable) arg);
            Declaration decl = ctx.getDeclaration(var);
            if (decl != null) {
                requiredDeclarations.add(decl);
                arguments[i] = new QueryArgument.Declr(decl);
            } else {
                ArrayElementReader reader = new ArrayElementReader(arrayReader, i, arg.getType());
                pattern.addDeclaration(var.getName()).setReadAccessor(reader);
                arguments[i] = QueryArgument.VAR;
                varIndexList.add(i);
            }
        } else if (arg instanceof Value) {
            arguments[i] = new QueryArgument.Literal(((Value) arg).getValue());
        } else {
            throw new UnsupportedOperationException();
        }
    }
    return new QueryElement(pattern, queryPattern.getQuery().getName(), arguments, varIndexList.stream().mapToInt(i -> i).toArray(), requiredDeclarations.toArray(new Declaration[requiredDeclarations.size()]), queryPattern.isOpen(), // TODO: query.isAbductive() );
    false);
}

Example 68 with Variable

use of org.drools.model.Variable in project drools by kiegroup.

the class LambdaConsequence method evaluate.

@Override
public void evaluate(KnowledgeHelper knowledgeHelper, WorkingMemory workingMemory) throws Exception {
    Tuple tuple = knowledgeHelper.getTuple();
    Declaration[] declarations = ((RuleTerminalNode) knowledgeHelper.getMatch().getTuple().getTupleSink()).getRequiredDeclarations();
    Variable[] vars = consequence.getVariables();
    Object[] facts;
    int factsOffset = 0;
    if (consequence.isUsingDrools()) {
        factsOffset++;
        facts = new Object[vars.length + 1];
        facts[0] = new DroolsImpl(knowledgeHelper, workingMemory);
    } else {
        facts = new Object[vars.length];
    }
    int declrCounter = 0;
    for (Variable var : vars) {
        if (var.isFact()) {
            Declaration declaration = declarations[declrCounter++];
            InternalFactHandle fh = tuple.get(declaration);
            if (consequence.isUsingDrools()) {
                ((DroolsImpl) facts[0]).registerFactHandle(fh);
            }
            facts[factsOffset++] = declaration.getValue((InternalWorkingMemory) workingMemory, fh.getObject());
        } else {
            facts[factsOffset++] = workingMemory.getGlobal(var.getName());
        }
    }
    consequence.getBlock().execute(facts);
    Object[] objs = knowledgeHelper.getTuple().toObjects();
    for (org.drools.model.Consequence.Update update : consequence.getUpdates()) {
        Object updatedFact = context.getBoundFact(update.getUpdatedVariable(), objs);
        // TODO the Update specs has the changed fields so use update(FactHandle newObject, long mask, Class<?> modifiedClass) instead
        knowledgeHelper.update(updatedFact);
    }
    for (FunctionN insert : consequence.getInserts()) {
        Object insertedFact = insert.apply(facts);
        knowledgeHelper.insert(insertedFact);
    }
    for (Variable delete : consequence.getDeletes()) {
        Object deletedFact = context.getBoundFact(delete, objs);
        knowledgeHelper.delete(deletedFact);
    }
}

Example 69 with Variable

use of org.drools.model.Variable in project drools by kiegroup.

the class MVELConsequence method evaluate.

@Override
public void evaluate(KnowledgeHelper knowledgeHelper, WorkingMemory workingMemory) throws Exception {
    // same as lambda consequence...
    Tuple tuple = knowledgeHelper.getTuple();
    Declaration[] declarations = ((RuleTerminalNode) knowledgeHelper.getMatch().getTuple().getTupleSink()).getRequiredDeclarations();
    Variable[] vars = consequence.getVariables();
    // ...but the facts are association of Variable and its value, preserving order.
    Map<Variable, Object> facts = new LinkedHashMap<>();
    int declrCounter = 0;
    for (Variable var : vars) {
        if (var.isFact()) {
            Declaration declaration = declarations[declrCounter++];
            InternalFactHandle fh = tuple.get(declaration);
            facts.put(var, declaration.getValue((InternalWorkingMemory) workingMemory, fh.getObject()));
        } else {
            facts.put(var, workingMemory.getGlobal(var.getName()));
        }
    }
    ScriptBlock scriptBlock = null;
    try {
        scriptBlock = (ScriptBlock) consequence.getBlock();
    } catch (ClassCastException e) {
        throw new RuntimeException("I tried to access a ScriptBlock but it was not. So something is thinking is a MVEL consequence but did not set the MVEL script textual representation", e);
    }
    String originalRHS = scriptBlock.getScript();
    String name = context.getRule().getPackageName() + "." + context.getRule().getName();
    String expression = MVELConsequenceBuilder.processMacros(originalRHS);
    String[] globalIdentifiers = new String[] {};
    String[] default_inputIdentifiers = new String[] { "this", "drools", "kcontext", "rule" };
    String[] inputIdentifiers = Stream.concat(Arrays.asList(default_inputIdentifiers).stream(), facts.entrySet().stream().map(kv -> kv.getKey().getName())).collect(Collectors.toList()).toArray(new String[] {});
    String[] default_inputTypes = new String[] { "org.drools.core.spi.KnowledgeHelper", "org.drools.core.spi.KnowledgeHelper", "org.drools.core.spi.KnowledgeHelper", "org.kie.api.definition.rule.Rule" };
    String[] inputTypes = Stream.concat(Arrays.asList(default_inputTypes).stream(), facts.entrySet().stream().map(kv -> kv.getKey().getType().getName())).collect(Collectors.toList()).toArray(new String[] {});
    // ^^ please notice about inputTypes, it is to use the Class.getName(), because is later used by the Classloader internally in MVEL to load the class,
    // do NOT replace with getCanonicalName() otherwise inner classes will not be loaded correctly.
    int languageLevel = 4;
    boolean strictMode = true;
    boolean readLocalsFromTuple = false;
    EvaluatorWrapper[] operators = new EvaluatorWrapper[] {};
    Declaration[] previousDeclarations = new Declaration[] {};
    Declaration[] localDeclarations = new Declaration[] {};
    String[] otherIdentifiers = new String[] {};
    MVELCompilationUnit cu = new MVELCompilationUnit(name, expression, globalIdentifiers, operators, previousDeclarations, localDeclarations, otherIdentifiers, inputIdentifiers, inputTypes, languageLevel, strictMode, readLocalsFromTuple);
    // TODO unfortunately the MVELDialectRuntimeData would be the one of compile time
    // the one from runtime is not helpful, in fact the dialect registry for runtime is empty:
    // MVELDialectRuntimeData runtimeData = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
    MVELDialectRuntimeData runtimeData = new MVELDialectRuntimeData();
    // this classloader will be used by the CompilationUnit to load the imports.
    runtimeData.onAdd(null, Thread.currentThread().getContextClassLoader());
    runtimeData.addPackageImport(context.getPkg().getName());
    runtimeData.addPackageImport("java.lang");
    // therefore we assume for the ScriptBlock all available KBPackages are the default available and imported for the scope of the Script itself.
    for (KiePackage kp : context.getKnowledgePackages()) {
        if (!kp.getName().equals(context.getPkg().getName())) {
            runtimeData.addPackageImport(kp.getName());
        }
    }
    // sometimes here it was passed as a 2nd argument a String?? similar to `rule R in file file.drl`
    Serializable cuResult = cu.getCompiledExpression(runtimeData);
    ExecutableStatement compiledExpression = (ExecutableStatement) cuResult;
    // TODO the part above up to the ExecutableStatement compiledExpression should be cached.
    Map<String, Object> mvelContext = new HashMap<>();
    mvelContext.put("this", knowledgeHelper);
    mvelContext.put("drools", knowledgeHelper);
    mvelContext.put("kcontext", knowledgeHelper);
    mvelContext.put("rule", knowledgeHelper.getRule());
    for (Entry<Variable, Object> kv : facts.entrySet()) {
        mvelContext.put(kv.getKey().getName(), kv.getValue());
    }
    CachingMapVariableResolverFactory cachingFactory = new CachingMapVariableResolverFactory(mvelContext);
    VariableResolverFactory factory = cu.getFactory(knowledgeHelper, ((AgendaItem) knowledgeHelper.getMatch()).getTerminalNode().getRequiredDeclarations(), knowledgeHelper.getRule(), knowledgeHelper.getTuple(), null, (InternalWorkingMemory) workingMemory, workingMemory.getGlobalResolver());
    cachingFactory.setNextFactory(factory);
    MVEL.executeExpression(compiledExpression, knowledgeHelper, cachingFactory);
}