Examples with Expression parsii.eval.Expression used on opensource projects

Example 1 with Expression

use of parsii.eval.Expression in project pinot by linkedin.

the class MetricExpression method evaluateExpression.

public static double evaluateExpression(String expressionString, Map<String, Double> context) throws Exception {
    Scope scope = Scope.create();
    expressionString = expressionString.replace(COUNT_METRIC, COUNT_METRIC_ESCAPED);
    Map<String, Double> metricValueContext = context;
    if (context.containsKey(COUNT_METRIC)) {
        metricValueContext = new HashMap<>(context);
        metricValueContext.put(COUNT_METRIC_ESCAPED, context.get(COUNT_METRIC));
    }
    Expression expression = Parser.parse(expressionString, scope);
    for (String metricName : metricValueContext.keySet()) {
        Variable variable = scope.create(metricName);
        if (!metricValueContext.containsKey(metricName)) {
            throw new Exception("No value set for metric:" + metricName + "  in the context:" + metricValueContext);
        }
        variable.setValue(metricValueContext.get(metricName));
    }
    return expression.evaluate();
}