Examples with EvaluationContext org.kie.dmn.feel.lang.EvaluationContext used on opensource projects

Example 6 with EvaluationContext

use of org.kie.dmn.feel.lang.EvaluationContext in project drools by kiegroup.

the class DecisionTableFunction method toDecisionRule.

/**
 * Convert row to DTDecisionRule
 * @param mainCtx the main context is used to identify the hosted FEELEventManager
 * @param embeddedFEEL a possibly cached embedded FEEL to compile the output expression, error will be reported up to the mainCtx
 * @param index
 * @param rule
 * @param inputSize
 * @return
 */
private static DTDecisionRule toDecisionRule(EvaluationContext mainCtx, FEEL embeddedFEEL, int index, List<?> rule, int inputSize) {
    // TODO should be check indeed block of inputSize n inputs, followed by block of outputs.
    DTDecisionRule dr = new DTDecisionRule(index);
    for (int i = 0; i < rule.size(); i++) {
        Object o = rule.get(i);
        if (i < inputSize) {
            dr.getInputEntry().add(toUnaryTest(mainCtx, o));
        } else {
            FEELEventListener ruleListener = event -> mainCtx.notifyEvt(() -> new FEELEventBase(event.getSeverity(), Msg.createMessage(Msg.ERROR_COMPILE_EXPR_DT_FUNCTION_RULE_IDX, index + 1, event.getMessage()), event.getSourceException()));
            embeddedFEEL.addListener(ruleListener);
            CompiledExpression compiledExpression = embeddedFEEL.compile((String) o, embeddedFEEL.newCompilerContext());
            dr.getOutputEntry().add(compiledExpression);
            embeddedFEEL.removeListener(ruleListener);
        }
    }
    return dr;
}

Example 7 with EvaluationContext

use of org.kie.dmn.feel.lang.EvaluationContext in project drools by kiegroup.

the class FunctionDefNode method evaluate.

@Override
public Object evaluate(EvaluationContext ctx) {
    List<String> params = formalParameters.stream().map(p -> p.evaluate(ctx)).collect(Collectors.toList());
    if (external) {
        try {
            // creating a simple algorithm to find the method in java
            // without using any external libraries in this initial implementation
            Map<String, Object> conf = (Map<String, Object>) this.body.evaluate(ctx);
            Map<String, Object> java = (Map<String, Object>) conf.get("java");
            if (java != null) {
                // this is a java function
                String clazzName = (String) java.get("class");
                String methodSignature = (String) java.get("method signature");
                if (clazzName != null && methodSignature != null) {
                    // might need to explicitly use a classloader here
                    Class<?> clazz = Class.forName(clazzName);
                    if (clazz != null) {
                        String[] mp = parseMethod(methodSignature);
                        if (mp != null) {
                            String methodName = mp[0];
                            String[] paramTypeNames = parseParams(mp[1]);
                            int numberOfParams = paramTypeNames.length;
                            if (numberOfParams == params.size()) {
                                Class[] paramTypes = new Class[numberOfParams];
                                for (int i = 0; i < numberOfParams; i++) {
                                    paramTypes[i] = getType(paramTypeNames[i]);
                                }
                                Method method = clazz.getMethod(methodName, paramTypes);
                                return new JavaFunction(ANONYMOUS, params, clazz, method);
                            } else {
                                ctx.notifyEvt(astEvent(Severity.ERROR, Msg.createMessage(Msg.PARAMETER_COUNT_MISMATCH_ON_FUNCTION_DEFINITION, getText())));
                                return null;
                            }
                        }
                    }
                }
            }
            ctx.notifyEvt(astEvent(Severity.ERROR, Msg.createMessage(Msg.UNABLE_TO_FIND_EXTERNAL_FUNCTION_AS_DEFINED_BY, getText())));
        } catch (Exception e) {
            ctx.notifyEvt(astEvent(Severity.ERROR, Msg.createMessage(Msg.ERROR_RESOLVING_EXTERNAL_FUNCTION_AS_DEFINED_BY, getText()), e));
        }
        return null;
    } else {
        return new CustomFEELFunction(ANONYMOUS, params, body);
    }
}