Examples with DMNExpressionEvaluator org.kie.dmn.core.api.DMNExpressionEvaluator used on opensource projects

Example 6 with DMNExpressionEvaluator

use of org.kie.dmn.core.api.DMNExpressionEvaluator in project drools by kiegroup.

the class DMNEvaluatorCompiler method compileContext.

private DMNExpressionEvaluator compileContext(DMNCompilerContext ctx, DMNModelImpl model, DMNBaseNode node, String contextName, Context expression) {
    Context ctxDef = expression;
    DMNContextEvaluator ctxEval = new DMNContextEvaluator(node.getName(), ctxDef);
    ctx.enterFrame();
    try {
        for (ContextEntry ce : ctxDef.getContextEntry()) {
            if (ce.getVariable() != null) {
                String entryName = ce.getVariable().getName();
                DMNCompilerHelper.checkVariableName(model, node.getSource(), entryName);
                DMNType entryType = compiler.resolveTypeRef(model, node, ce.getVariable(), ce.getVariable(), ce.getVariable().getTypeRef());
                // add context entry to the list of available variables for the following entries
                ctx.setVariable(entryName, entryType);
                DMNExpressionEvaluator evaluator = compileExpression(ctx, model, node, entryName, ce.getExpression());
                ctxEval.addEntry(entryName, entryType, evaluator, ce);
            } else {
                // if the variable is not defined, then it should be the last
                // entry in the context and the result of this context evaluation is the
                // result of this expression itself
                // TODO: if it is not the last entry, raise error message
                DMNType type = null;
                if (ctxDef.getParent() instanceof ContextEntry && ((ContextEntry) ctxDef.getParent()).getVariable() != null) {
                    ContextEntry parentEntry = (ContextEntry) ctxDef.getParent();
                    type = compiler.resolveTypeRef(model, node, parentEntry.getVariable(), parentEntry.getVariable(), parentEntry.getVariable().getTypeRef());
                } else if (node instanceof BusinessKnowledgeModelNode) {
                    type = ((BusinessKnowledgeModelNode) node).getResultType();
                } else if (node instanceof DecisionNode) {
                    type = ((DecisionNode) node).getResultType();
                }
                ctxEval.addEntry(DMNContextEvaluator.RESULT_ENTRY, type, compileExpression(ctx, model, node, contextName, ce.getExpression()), ce);
            }
        }
    } finally {
        ctx.exitFrame();
    }
    return ctxEval;
}

Example 7 with DMNExpressionEvaluator

use of org.kie.dmn.core.api.DMNExpressionEvaluator in project drools by kiegroup.

the class DMNEvaluatorCompiler method compileFunctionDefinition.

private DMNExpressionEvaluator compileFunctionDefinition(DMNCompilerContext ctx, DMNModelImpl model, DMNBaseNode node, String functionName, FunctionDefinition expression) {
    FunctionDefinition funcDef = expression;
    String kindStr = funcDef.getAdditionalAttributes().get(FunctionDefinition.KIND_QNAME);
    FunctionDefinition.Kind kind = kindStr != null ? FunctionDefinition.Kind.determineFromString(kindStr) : FunctionDefinition.Kind.FEEL;
    if (kind == null) {
        // unknown function kind
        MsgUtil.reportMessage(logger, DMNMessage.Severity.ERROR, funcDef, model, null, null, Msg.FUNC_DEF_INVALID_KIND, kindStr, node.getIdentifierString());
        return new DMNFunctionDefinitionEvaluator(node.getName(), funcDef);
    } else if (kind.equals(FunctionDefinition.Kind.FEEL)) {
        ctx.enterFrame();
        try {
            DMNFunctionDefinitionEvaluator func = new DMNFunctionDefinitionEvaluator(node.getName(), funcDef);
            for (InformationItem p : funcDef.getFormalParameter()) {
                DMNCompilerHelper.checkVariableName(model, p, p.getName());
                DMNType dmnType = compiler.resolveTypeRef(model, node, p, p, p.getTypeRef());
                func.addParameter(p.getName(), dmnType);
                ctx.setVariable(p.getName(), dmnType);
            }
            DMNExpressionEvaluator eval = compileExpression(ctx, model, node, functionName, funcDef.getExpression());
            if (eval instanceof DMNLiteralExpressionEvaluator && ((DMNLiteralExpressionEvaluator) eval).isFunctionDefinition()) {
                // we need to resolve the function and eliminate the indirection
                CompiledExpression fexpr = ((DMNLiteralExpressionEvaluator) eval).getExpression();
                FEELFunction feelFunction = feel.evaluateFunctionDef(ctx, fexpr, model, funcDef, Msg.FUNC_DEF_COMPILATION_ERR, functionName, node.getIdentifierString());
                DMNInvocationEvaluator invoker = new DMNInvocationEvaluator(node.getName(), node.getSource(), functionName, new Invocation(), (fctx, fname) -> feelFunction, // feel can be null as anyway is hardcoded to `feelFunction`
                null);
                for (InformationItem p : funcDef.getFormalParameter()) {
                    invoker.addParameter(p.getName(), func.getParameterType(p.getName()), (em, dr) -> new EvaluatorResultImpl(dr.getContext().get(p.getName()), EvaluatorResult.ResultType.SUCCESS));
                }
                eval = invoker;
            }
            func.setEvaluator(eval);
            return func;
        } finally {
            ctx.exitFrame();
        }
    } else if (kind.equals(FunctionDefinition.Kind.JAVA)) {
        if (funcDef.getExpression() instanceof Context) {
            // proceed
            Context context = (Context) funcDef.getExpression();
            String clazz = null;
            String method = null;
            for (ContextEntry ce : context.getContextEntry()) {
                if (ce.getVariable() != null && ce.getVariable().getName() != null && ce.getExpression() != null && ce.getExpression() instanceof LiteralExpression) {
                    if (ce.getVariable().getName().equals("class")) {
                        clazz = stripQuotes(((LiteralExpression) ce.getExpression()).getText().trim());
                    } else if (ce.getVariable().getName().equals("method signature")) {
                        method = stripQuotes(((LiteralExpression) ce.getExpression()).getText().trim());
                    }
                }
            }
            if (clazz != null && method != null) {
                String params = funcDef.getFormalParameter().stream().map(p -> p.getName()).collect(Collectors.joining(","));
                String expr = String.format("function(%s) external { java: { class: \"%s\", method signature: \"%s\" }}", params, clazz, method);
                try {
                    FEELFunction feelFunction = feel.evaluateFunctionDef(ctx, expr, model, funcDef, Msg.FUNC_DEF_COMPILATION_ERR, functionName, node.getIdentifierString());
                    if (feelFunction != null) {
                        ((BaseFEELFunction) feelFunction).setName(functionName);
                    }
                    DMNInvocationEvaluator invoker = new DMNInvocationEvaluator(node.getName(), node.getSource(), functionName, new Invocation(), (fctx, fname) -> feelFunction, // feel can be null as anyway is hardcoded to `feelFunction`
                    null);
                    DMNFunctionDefinitionEvaluator func = new DMNFunctionDefinitionEvaluator(node.getName(), funcDef);
                    for (InformationItem p : funcDef.getFormalParameter()) {
                        DMNCompilerHelper.checkVariableName(model, p, p.getName());
                        DMNType dmnType = compiler.resolveTypeRef(model, node, p, p, p.getTypeRef());
                        func.addParameter(p.getName(), dmnType);
                        invoker.addParameter(p.getName(), dmnType, (em, dr) -> new EvaluatorResultImpl(dr.getContext().get(p.getName()), EvaluatorResult.ResultType.SUCCESS));
                    }
                    func.setEvaluator(invoker);
                    return func;
                } catch (Throwable e) {
                    MsgUtil.reportMessage(logger, DMNMessage.Severity.ERROR, expression, model, e, null, Msg.FUNC_DEF_COMPILATION_ERR, functionName, node.getIdentifierString(), "Exception raised: " + e.getClass().getSimpleName());
                }
            } else {
                MsgUtil.reportMessage(logger, DMNMessage.Severity.ERROR, expression, model, null, null, Msg.FUNC_DEF_MISSING_ENTRY, functionName, node.getIdentifierString());
            }
        } else {
            // error, java function definitions require a context
            MsgUtil.reportMessage(logger, DMNMessage.Severity.ERROR, funcDef, model, null, null, Msg.FUNC_DEF_BODY_NOT_CONTEXT, node.getIdentifierString());
        }
    } else if (kind.equals(FunctionDefinition.Kind.PMML)) {
        MsgUtil.reportMessage(logger, DMNMessage.Severity.WARN, funcDef, model, null, null, Msg.FUNC_DEF_PMML_NOT_SUPPORTED, node.getIdentifierString());
    } else {
        MsgUtil.reportMessage(logger, DMNMessage.Severity.ERROR, funcDef, model, null, null, Msg.FUNC_DEF_INVALID_KIND, kindStr, node.getIdentifierString());
    }
    return new DMNFunctionDefinitionEvaluator(node.getName(), funcDef);
}

Example 8 with DMNExpressionEvaluator

use of org.kie.dmn.core.api.DMNExpressionEvaluator in project drools by kiegroup.

the class DMNEvaluatorCompiler method compileRelation.

private DMNExpressionEvaluator compileRelation(DMNCompilerContext ctx, DMNModelImpl model, DMNBaseNode node, String relationName, Relation expression) {
    Relation relationDef = expression;
    DMNRelationEvaluator relationEval = new DMNRelationEvaluator(node.getName(), node.getSource(), relationDef);
    for (InformationItem col : relationDef.getColumn()) {
        DMNCompilerHelper.checkVariableName(model, col, col.getName());
        relationEval.addColumn(col.getName());
    }
    for (org.kie.dmn.model.v1_1.List row : relationDef.getRow()) {
        java.util.List<DMNExpressionEvaluator> values = new ArrayList<>();
        for (Expression expr : row.getExpression()) {
            values.add(compileExpression(ctx, model, node, relationName, expr));
        }
        relationEval.addRow(values);
    }
    return relationEval;
}