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A testing framework for the JVM
There is a newer version: 7.10.1
package org.testng.internal;

import org.testng.IDataProviderListener;
import org.testng.ITestContext;
import org.testng.ITestNGMethod;
import org.testng.ITestResult;
import org.testng.internal.annotations.IAnnotationFinder;
import org.testng.util.Strings;
import org.testng.xml.XmlSuite;

import static org.testng.internal.Parameters.MethodParameters;

import java.util.Collection;
import java.util.Map;

class ParameterHandler {
    private final IAnnotationFinder finder;
    private final Collection listeners;

    ParameterHandler(IAnnotationFinder finder, Collection listeners) {
        this.finder = finder;
        this.listeners = listeners;
    }

    ParameterBag createParameters(ITestNGMethod testMethod,
                                  Map parameters,
                                  Map allParameterNames,
                                  ITestContext testContext) {
        return createParameters(testMethod, parameters, allParameterNames, testContext, null);
    }

    ParameterBag createParameters(ITestNGMethod testMethod,
                                  Map parameters,
                                  Map allParameterNames,
                                  ITestContext testContext,
                                  Object fedInstance) {
        return handleParameters(testMethod, testMethod.getInstance(), allParameterNames, parameters, testContext, fedInstance);
    }

    private ParameterBag handleParameters(ITestNGMethod testMethod,
                                          Object instance,
                                          Map allParameterNames,
                                          Map parameters,
                                          ITestContext testContext,
                                          Object fedInstance) {
        XmlSuite suite = testContext.getCurrentXmlTest().getSuite();
        try {
            MethodParameters methodParams = MethodParameters.newInstance(parameters, testMethod, testContext);
            ParameterHolder paramHolder = Parameters.handleParameters(testMethod,
                    allParameterNames,
                    instance,
                    methodParams,
                    suite,
                    finder,
                    fedInstance, listeners);
            return new ParameterBag(paramHolder);
        } catch (Throwable cause) {
            String msg = Utils.longStackTrace(cause.getCause() != null ? cause.getCause() : cause, true);
            if (Strings.isNotNullAndNotEmpty(msg)) {
                Utils.error(msg);
            }
            ITestResult result = new TestResult(instance, testMethod, cause, testContext);
            return new ParameterBag(result);
        }
    }

    /**
     * This class holds a {@code ParameterHolder} or in case of an error, a non-null
     * {@code TestResult} containing the cause
     */
    static class ParameterBag {
        final ParameterHolder parameterHolder;
        final ITestResult errorResult;

        ParameterBag(ParameterHolder parameterHolder) {
            this.parameterHolder = parameterHolder;
            this.errorResult = null;
        }

        ParameterBag(ITestResult errorResult) {
            this.parameterHolder = null;
            this.errorResult = errorResult;
        }

        boolean hasErrors() {
            return errorResult != null;
        }

        boolean runInParallel() {
            return ((parameterHolder != null) &&
                    (parameterHolder.origin == ParameterHolder.ParameterOrigin.ORIGIN_DATA_PROVIDER &&
                    parameterHolder.dataProviderHolder.isParallel())
            );
        }

    }
}