Examples with MVELObjectExpression org.drools.core.base.mvel.MVELObjectExpression used on opensource projects

Example 1 with MVELObjectExpression

use of org.drools.core.base.mvel.MVELObjectExpression in project drools by kiegroup.

the class MVELObjectExpressionBuilder method build.

public static MVELObjectExpression build(String expression, RuleBuildContext context) {
    boolean typesafe = context.isTypesafe();
    // pushing consequence LHS into the stack for variable resolution
    context.getDeclarationResolver().pushOnBuildStack(context.getRule().getLhs());
    try {
        // This builder is re-usable in other dialects, so specify by name
        MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
        Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
        MVELAnalysisResult analysis = (MVELAnalysisResult) dialect.analyzeExpression(context, context.getRuleDescr(), expression, new BoundIdentifiers(DeclarationScopeResolver.getDeclarationClasses(decls), context));
        context.setTypesafe(analysis.isTypesafe());
        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, RuleTerminalNode.SortDeclarations.instance);
        MVELCompilationUnit unit = dialect.getMVELCompilationUnit(expression, analysis, previousDeclarations, null, null, context, "drools", KnowledgeHelper.class, false, MVELCompilationUnit.Scope.EXPRESSION);
        MVELObjectExpression expr = new MVELObjectExpression(unit, dialect.getId());
        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
        data.addCompileable(context.getRule(), expr);
        expr.compile(data);
        return expr;
    } catch (final Exception e) {
        DialectUtil.copyErrorLocation(e, context.getRuleDescr());
        context.addError(new DescrBuildError(context.getParentDescr(), context.getRuleDescr(), null, "Unable to build expression : " + e.getMessage() + "'" + expression + "'"));
        return null;
    } finally {
        context.setTypesafe(typesafe);
    }
}

Example 2 with MVELObjectExpression

use of org.drools.core.base.mvel.MVELObjectExpression in project drools by kiegroup.

the class RuleBuilder method buildTimer.

private static void buildTimer(RuleImpl rule, String timerString, RuleBuildContext context) {
    if (timerString.indexOf('(') >= 0) {
        timerString = timerString.substring(timerString.indexOf('(') + 1, timerString.lastIndexOf(')')).trim();
    }
    int colonPos = timerString.indexOf(":");
    int semicolonPos = timerString.indexOf(";");
    // default protocol
    String protocol = "int";
    if (colonPos == -1) {
        if (timerString.startsWith("int") || timerString.startsWith("cron") || timerString.startsWith("expr")) {
            DroolsError err = new RuleBuildError(rule, context.getParentDescr(), null, "Incorrect timer definition '" + timerString + "' - missing colon?");
            context.addError(err);
            return;
        }
    } else {
        protocol = timerString.substring(0, colonPos);
    }
    String startDate = extractParam(timerString, "start");
    String endDate = extractParam(timerString, "end");
    String repeatLimitString = extractParam(timerString, "repeat-limit");
    int repeatLimit = repeatLimitString != null ? Integer.parseInt(repeatLimitString) : -1;
    String body = timerString.substring(colonPos + 1, semicolonPos > 0 ? semicolonPos : timerString.length()).trim();
    Timer timer;
    if ("cron".equals(protocol)) {
        try {
            timer = new CronTimer(createMVELExpr(startDate, context), createMVELExpr(endDate, context), repeatLimit, new CronExpression(body));
        } catch (ParseException e) {
            DroolsError err = new RuleBuildError(rule, context.getParentDescr(), null, "Unable to build set timer '" + timerString + "'");
            context.addError(err);
            return;
        }
    } else if ("int".equals(protocol)) {
        String[] times = body.trim().split("\\s");
        long delay = 0;
        long period = 0;
        if (times.length > 2) {
            DroolsError err = new RuleBuildError(rule, context.getParentDescr(), null, "Incorrect number of arguments for interval timer '" + timerString + "'");
            context.addError(err);
            return;
        }
        try {
            if (times.length == 1) {
                // only defines a delay
                delay = TimeUtils.parseTimeString(times[0]);
            } else {
                // defines a delay and a period for intervals
                delay = TimeUtils.parseTimeString(times[0]);
                period = TimeUtils.parseTimeString(times[1]);
            }
        } catch (RuntimeException e) {
            DroolsError err = new RuleBuildError(rule, context.getParentDescr(), null, "Incorrect timer definition '" + timerString + "' " + e.getMessage());
            context.addError(err);
            return;
        }
        timer = new IntervalTimer(createMVELExpr(startDate, context), createMVELExpr(endDate, context), repeatLimit, delay, period);
    } else if ("expr".equals(protocol)) {
        body = body.trim();
        StringTokenizer tok = new StringTokenizer(body, ",;");
        if (tok.countTokens() > 2) {
            DroolsError err = new RuleBuildError(rule, context.getParentDescr(), null, "Incorrect number of arguments for expression timer '" + timerString + "'");
            context.addError(err);
            return;
        }
        MVELObjectExpression times = MVELObjectExpressionBuilder.build(tok.nextToken().trim(), context);
        MVELObjectExpression period = tok.hasMoreTokens() ? MVELObjectExpressionBuilder.build(tok.nextToken().trim(), context) : MVELObjectExpressionBuilder.build("0", context);
        timer = new ExpressionIntervalTimer(createMVELExpr(startDate, context), createMVELExpr(endDate, context), repeatLimit, times, period);
    } else {
        DroolsError err = new RuleBuildError(rule, context.getParentDescr(), null, "Protocol for timer does not exist '" + timerString + "'");
        context.addError(err);
        return;
    }
    rule.setTimer(timer);
}