private MVELInitializer() {
	MVEL.COMPILER_OPT_ALLOW_OVERRIDE_ALL_PROPHANDLING = true; // forcing to use PropertyHandler
       MathProcessor.COMPARE_WITH_PRECISION = true;
       OptimizerFactory.setDefaultOptimizer(OptimizerFactory.SAFE_REFLECTIVE); //Workaround for MVEL-291 "Custom property handler optimization fails with RuntimeException unable to compileShared"
	PropertyHandlerFactory.registerPropertyHandler(IMessage.class, new IMessagePropertyHandler());
	PropertyHandlerFactory.registerPropertyHandler(Map.class, new MapPropertyHandler());

	ctx = new ParserContext();
	ctx.addImport(LocalDateTime.class);
	ctx.addImport(LocalDate.class);
	ctx.addImport(LocalTime.class);
	ctx.addImport(BigDecimal.class);
	ctx.addImport(SailfishURI.class);
	ctx.addImport(Objects.class);
}
 

public static Boolean executeInputExpression(InputClause inputClause, UnaryTests inputEntry, MvelExecutionContext executionContext) {

        if (inputClause == null) {
            throw new IllegalArgumentException("input clause is required");
        }
        if (inputClause.getInputExpression() == null) {
            throw new IllegalArgumentException("input expression is required");
        }
        if (inputEntry == null) {
            throw new IllegalArgumentException("input entry is required");
        }
        
        for (Class<?> variableClass : executionContext.getPropertyHandlers().keySet()) {
            PropertyHandlerFactory.registerPropertyHandler(variableClass, executionContext.getPropertyHandlers().get(variableClass));
        }

        // check if variable is present MVEL execution context
        executionContext.checkExecutionContext(inputClause.getInputExpression().getText());

        // pre parse expression
        String parsedExpression = MvelConditionExpressionPreParser.parse(inputEntry.getText(), inputClause.getInputExpression().getText());

        // compile MVEL expression
        Serializable compiledExpression = MVEL.compileExpression(parsedExpression, executionContext.getParserContext());

        // execute MVEL expression
        Boolean result;

        try {
            result = MVEL.executeExpression(compiledExpression, executionContext.getStackVariables(), Boolean.class);
        } catch (Exception ex) {
            logger.warn("Error while executing input entry: {}", parsedExpression, ex);
            throw new ActivitiDmnExpressionException("error while executing input entry", parsedExpression, ex);
        }

        return result;
    }
 

private Pattern buildPattern(RuleBuildContext context, PatternDescr patternDescr, ObjectType objectType) {
    String patternIdentifier = patternDescr.getIdentifier();
    boolean duplicateBindings = patternIdentifier != null && objectType instanceof ClassObjectType &&
            context.getDeclarationResolver().isDuplicated(context.getRule(),
                                                          patternIdentifier,
                                                          objectType.getClassName());

    Pattern pattern;
    if (!StringUtils.isEmpty(patternIdentifier) && !duplicateBindings) {

        pattern = new Pattern(context.getNextPatternId(),
                              0, // offset is 0 by default
                              objectType,
                              patternIdentifier,
                              patternDescr.isInternalFact(context));
        if (objectType instanceof ClassObjectType) {
            // make sure PatternExtractor is wired up to correct ClassObjectType and set as a target for rewiring
            context.getPkg().getClassFieldAccessorStore().wireObjectType(objectType, (AcceptsClassObjectType) pattern.getDeclaration().getExtractor());
        }
    } else {
        pattern = new Pattern(context.getNextPatternId(),
                              0, // offset is 0 by default
                              objectType,
                              null);
    }
    pattern.setPassive(patternDescr.isPassive(context));

    if (ClassObjectType.Match_ObjectType.isAssignableFrom(pattern.getObjectType())) {
        PropertyHandler handler = PropertyHandlerFactory.getPropertyHandler(RuleTerminalNodeLeftTuple.class);
        if (handler == null) {
            PropertyHandlerFactoryFixer.getPropertyHandlerClass().put(RuleTerminalNodeLeftTuple.class,
                                                                      new ActivationPropertyHandler());
        }
    }

    // adding the newly created pattern to the build stack this is necessary in case of local declaration usage
    context.getDeclarationResolver().pushOnBuildStack(pattern);

    if (duplicateBindings) {
        processDuplicateBindings(patternDescr.isUnification(), patternDescr, pattern, patternDescr, "this", patternDescr.getIdentifier(), context);
    }
    return pattern;
}
 

@Override
public void finalize() {
	PropertyHandlerFactory.unregisterPropertyHandler(IMessage.class);
	PropertyHandlerFactory.unregisterPropertyHandler(MapMessage.class);
}