Examples with Declaration org.drools.core.rule.Declaration used on opensource projects

Example 66 with Declaration

use of org.drools.core.rule.Declaration 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 = new EvalCondition(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);
    }
}

Example 67 with Declaration

use of org.drools.core.rule.Declaration in project drools by kiegroup.

the class MVELFromBuilder method build.

public RuleConditionElement build(final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {
    String text = ((FromDescr) descr).getExpression();
    Optional<EntryPointId> entryPointId = context.getEntryPointId(text);
    if (entryPointId.isPresent()) {
        return entryPointId.get();
    }
    // This builder is re-usable in other dialects, so specify by name
    MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
    boolean typeSafe = context.isTypesafe();
    if (!dialect.isStrictMode()) {
        context.setTypesafe(false);
    }
    try {
        Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
        AnalysisResult analysis = dialect.analyzeExpression(context, descr, text, new BoundIdentifiers(DeclarationScopeResolver.getDeclarationClasses(decls), context));
        if (analysis == null) {
            // something bad happened
            return null;
        }
        Class<?> returnType = ((MVELAnalysisResult) analysis).getReturnType();
        if (prefixPattern != null && !prefixPattern.isCompatibleWithFromReturnType(returnType)) {
            context.addError(new DescrBuildError(descr, context.getRuleDescr(), null, "Pattern of type: '" + prefixPattern.getObjectType() + "' on rule '" + context.getRuleDescr().getName() + "' is not compatible with type " + returnType.getCanonicalName() + " returned by source"));
            return null;
        }
        final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
        final Declaration[] declarations = new Declaration[usedIdentifiers.getDeclrClasses().size()];
        int j = 0;
        for (String str : usedIdentifiers.getDeclrClasses().keySet()) {
            declarations[j++] = decls.get(str);
        }
        Arrays.sort(declarations, SortDeclarations.instance);
        MVELCompilationUnit unit = dialect.getMVELCompilationUnit(text, analysis, declarations, null, null, context, "drools", KnowledgeHelper.class, false, MVELCompilationUnit.Scope.CONSEQUENCE);
        MVELDataProvider dataProvider = new MVELDataProvider(unit, context.getDialect().getId());
        From from = new From(dataProvider);
        from.setResultPattern(prefixPattern);
        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
        data.addCompileable(from, dataProvider);
        dataProvider.compile(data, context.getRule());
        return from;
    } catch (final Exception e) {
        DialectUtil.copyErrorLocation(e, descr);
        context.addError(new DescrBuildError(context.getParentDescr(), descr, null, "Unable to build expression for 'from' : " + e.getMessage() + " '" + text + "'"));
        return null;
    } finally {
        context.setTypesafe(typeSafe);
    }
}

Example 68 with Declaration

use of org.drools.core.rule.Declaration in project drools by kiegroup.

the class StatefulKnowledgeSessionImpl method getActivationParameters.

private Map getActivationParameters(Tuple tuple) {
    Map result = new HashMap();
    Declaration[] declarations = ((RuleTerminalNode) tuple.getTupleSink()).getAllDeclarations();
    for (int i = 0; i < declarations.length; i++) {
        FactHandle handle = tuple.get(declarations[i]);
        if (handle instanceof InternalFactHandle) {
            result.put(declarations[i].getIdentifier(), declarations[i].getValue(this, ((InternalFactHandle) handle).getObject()));
        }
    }
    return result;
}

Example 69 with Declaration

use of org.drools.core.rule.Declaration in project drools by kiegroup.

the class StatefulKnowledgeSessionImpl method internalGetQueryResult.

protected QueryResultsImpl internalGetQueryResult(boolean calledFromRHS, String queryName, Object... arguments) {
    try {
        startOperation();
        this.lock.lock();
        this.kBase.executeQueuedActions();
        // eventually enqueued by events that have been inserted when already expired
        if (calledFromRHS) {
            flushPropagations();
            flushPropagations();
        } else {
            agenda.executeFlush();
            agenda.executeFlush();
        }
        DroolsQuery queryObject = new DroolsQuery(queryName, arguments, getQueryListenerInstance(), false, null, null, null, null, null);
        InternalFactHandle handle = this.handleFactory.newFactHandle(queryObject, null, this, this);
        final PropagationContext pCtx = pctxFactory.createPropagationContext(getNextPropagationIdCounter(), PropagationContext.Type.INSERTION, null, null, handle, getEntryPoint());
        BaseNode[] tnodes = evalQuery(queryName, queryObject, handle, pCtx, calledFromRHS);
        List<Map<String, Declaration>> decls = new ArrayList<Map<String, Declaration>>();
        if (tnodes != null) {
            for (BaseNode node : tnodes) {
                decls.add(((QueryTerminalNode) node).getSubRule().getOuterDeclarations());
            }
        }
        this.handleFactory.destroyFactHandle(handle);
        return new QueryResultsImpl((List<QueryRowWithSubruleIndex>) queryObject.getQueryResultCollector().getResults(), decls.toArray(new Map[decls.size()]), this, (queryObject.getQuery() != null) ? queryObject.getQuery().getParameters() : new Declaration[0]);
    } finally {
        this.lock.unlock();
        endOperation();
    }
}

Example 70 with Declaration

use of org.drools.core.rule.Declaration 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);
        }
    }
}