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 StrLen extends AbstractFunction {

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

     private static final String KEY = "__strLen";

     static {

         desc.add("String to measure length");

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

     }

     private Object[] values;

     /**

      * No-arg constructor.

      */

     public StrLen() {

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public synchronized String execute(SampleResult previousResult, Sampler currentSampler)

             throws InvalidVariableException {

         JMeterVariables vars = getVariables();

         Integer len = ((CompoundVariable) values[0]).execute().length();

         if (vars != null && values.length > 1) {

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

             vars.put(varName, len.toString());

         }

         return len.toString();

     }

     /**

      * {@inheritDoc}

      */

     @Override

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

         checkMinParameterCount(parameters, 1);

         values = parameters.toArray();

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String getReferenceKey() {

         return KEY;

     }

     /**

      * {@inheritDoc}

      */

     public List<String> getArgumentDesc() {

         return desc;

     }

 }