Examples with LambdaEvalExpression org.drools.modelcompiler.constraints.LambdaEvalExpression used on opensource projects

Example 1 with LambdaEvalExpression

use of org.drools.modelcompiler.constraints.LambdaEvalExpression in project drools by kiegroup.

the class KiePackagesBuilder method buildConditionalConsequence.

private ConditionalBranch buildConditionalConsequence(RuleContext ctx, ConditionalNamedConsequenceImpl consequence) {
    // This makes the assumption the variable is for a pattern (not field) binding, and this binding must already exist.
    // It's used for the implicit bindings
    // The main issue with all of this, is it doesn't allow access to other previous variables. And it should work with
    // with pattern bindings and field bindings. What if getVariables() returns an array.length > 1?
    EvalCondition evalCondition;
    if (consequence.getExpr() != null) {
        Pattern pattern = ctx.getPattern(consequence.getExpr().getVariables()[0]);
        if (pattern.getDeclaration() != null) {
            // pattern has a root binding, so use that.
            EvalExpression eval = new LambdaEvalExpression(pattern, consequence.getExpr());
            evalCondition = new EvalCondition(eval, new Declaration[] { pattern.getDeclaration() });
        } else {
            // Pattern does not have root binding, so use field bindings.
            Declaration[] declarations = pattern.getDeclarations().values().toArray(new Declaration[pattern.getDeclarations().size()]);
            EvalExpression eval = new LambdaEvalExpression(declarations, consequence.getExpr());
            evalCondition = new EvalCondition(eval, declarations);
        }
    } else {
        evalCondition = new EvalCondition(LambdaEvalExpression.EMPTY, null);
    }
    return new ConditionalBranch(evalCondition, new NamedConsequence(consequence.getThenConsequence().getName(), consequence.getThenConsequence().isBreaking()), consequence.getElseBranch() != null ? buildConditionalConsequence(ctx, consequence.getElseBranch()) : null);
}

Example 2 with LambdaEvalExpression

use of org.drools.modelcompiler.constraints.LambdaEvalExpression in project drools by kiegroup.

the class KiePackagesBuilder method buildEval.

private EvalCondition buildEval(RuleContext ctx, EvalImpl eval) {
    Declaration[] declarations = Stream.of(eval.getExpr().getVariables()).map(ctx::getDeclaration).toArray(Declaration[]::new);
    EvalExpression evalExpr = new LambdaEvalExpression(declarations, eval.getExpr());
    return new EvalCondition(evalExpr, declarations);
}