package kg.apc.jmeter.functions;

 import org.apache.jmeter.engine.util.CompoundVariable;

 import org.apache.jmeter.functions.AbstractFunction;

 import org.apache.jmeter.functions.InvalidVariableException;

 import org.apache.jmeter.samplers.SampleResult;

 import org.apache.jmeter.samplers.Sampler;

 import org.apache.jmeter.threads.JMeterVariables;

 import java.util.Collection;

 import java.util.LinkedList;

 import java.util.List;

 /**

  * Provides a DoubleSum function that adds two or more Double values.

  * Mostly copied from LongSum

  */

 public class DoubleSum extends AbstractFunction {

     private static final List<String> desc = new LinkedList<String>();

     private static final String KEY = "__doubleSum";

     static {

         desc.add("First double to add");

         desc.add("Second long to add - further doubles can be summed by adding further arguments");

         desc.add("Name of variable in which to store the result (optional)");

     }

     private Object[] values;

     /**

      * No-arg constructor.

      */

     public DoubleSum() {

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public synchronized String execute(SampleResult previousResult, Sampler currentSampler)

             throws InvalidVariableException {

         JMeterVariables vars = getVariables();

         Double sum = 0D;

         String varName = ((CompoundVariable) values[values.length - 1]).execute().trim();

         for (int i = 0; i < values.length - 1; i++) {

             sum += Double.parseDouble(((CompoundVariable) values[i]).execute());

         }

         try {

             sum += Double.parseDouble(varName);

             varName = null; // there is no variable name

         } catch (NumberFormatException ignored) {

         }

         String totalString = Double.toString(sum);

         if (vars != null && varName != null && varName.length() > 0) {// vars will be null on TestPlan

             vars.put(varName, totalString);

         }

         return totalString;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public synchronized void setParameters(Collection<CompoundVariable> parameters) throws InvalidVariableException {

         checkMinParameterCount(parameters, 2);

         values = parameters.toArray();

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String getReferenceKey() {

         return KEY;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public List<String> getArgumentDesc() {

         return desc;

     }

 }