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

import org.testng.IInvokedMethod;
import org.testng.IInvokedMethodListener;
import org.testng.IInvokedMethodListener2;
import org.testng.ITestContext;
import org.testng.ITestResult;
import org.testng.collections.Maps;

import java.util.Map;

import static org.testng.internal.invokers.InvokedMethodListenerMethod.AFTER_INVOCATION;
import static org.testng.internal.invokers.InvokedMethodListenerMethod.BEFORE_INVOCATION;
import static org.testng.internal.invokers.InvokedMethodListenerSubtype.EXTENDED_LISTENER;
import static org.testng.internal.invokers.InvokedMethodListenerSubtype.SIMPLE_LISTENER;

/**
 * Hides complexity of calling methods of {@link IInvokedMethodListener} and
 * {@link IInvokedMethodListener2}.
 *
 * @author Ansgar Konermann
 */
public class InvokedMethodListenerInvoker {

  private InvokedMethodListenerMethod m_listenerMethod;
  private ITestContext m_testContext;
  private ITestResult m_testResult;

  /**
   * Creates a new invoker instance which can be used to call the specified {@code listenerMethod}
   * on any number of {@link IInvokedMethodListener}s.
   *
   * @param listenerMethod method which should be called
   * @param testResult test result which should be passed to the listener method upon invocation
   * @param testContext test context which should be passed to the listener method upon invocation.
   *        This parameter is only used when calling methods on an {@link IInvokedMethodListener2}.
   */
  public InvokedMethodListenerInvoker(InvokedMethodListenerMethod listenerMethod,
                                      ITestResult testResult, ITestContext testContext) {
    m_listenerMethod = listenerMethod;
    m_testContext = testContext;
    m_testResult = testResult;
  }

  /**
   * Invoke the given {@code listenerInstance}, calling the method specified in the constructor of
   * this {@link InvokedMethodListenerInvoker}.
   *
   * @param listenerInstance the listener instance which should be invoked.
   * @param invokedMethod the {@link IInvokedMethod} instance which should be passed to the
   *        {@link IInvokedMethodListener#beforeInvocation(IInvokedMethod, ITestResult)},
   *        {@link IInvokedMethodListener#afterInvocation(IInvokedMethod, ITestResult)},
   *        {@link IInvokedMethodListener2#beforeInvocation(IInvokedMethod, ITestResult, ITestContext)}
   *        or {@link IInvokedMethodListener2#afterInvocation(IInvokedMethod, ITestResult, ITestContext)}
   *        method.
   */

  @SuppressWarnings("unchecked")
  public void invokeListener(IInvokedMethodListener listenerInstance,
                             IInvokedMethod invokedMethod) {
    final InvocationStrategy strategy = obtainStrategyFor(listenerInstance, m_listenerMethod);
    strategy.callMethod(listenerInstance, invokedMethod, m_testResult, m_testContext);
  }

  private InvocationStrategy obtainStrategyFor(IInvokedMethodListener listenerInstance,
      InvokedMethodListenerMethod listenerMethod) {
    InvokedMethodListenerSubtype invokedMethodListenerSubtype = InvokedMethodListenerSubtype
        .fromListener(listenerInstance);
    Map strategiesForListenerType = strategies
        .get(invokedMethodListenerSubtype);
    InvocationStrategy invocationStrategy = strategiesForListenerType.get(listenerMethod);
    return invocationStrategy;
  }

  private static interface InvocationStrategy {
    void callMethod(LISTENER_TYPE listener, IInvokedMethod invokedMethod, ITestResult testResult,
        ITestContext testContext);
  }

  private static class InvokeBeforeInvocationWithoutContextStrategy implements
      InvocationStrategy {
    public void callMethod(IInvokedMethodListener listener, IInvokedMethod invokedMethod,
        ITestResult testResult, ITestContext testContext) {
      listener.beforeInvocation(invokedMethod, testResult);
    }
  }

  private static class InvokeBeforeInvocationWithContextStrategy implements
      InvocationStrategy {
    public void callMethod(IInvokedMethodListener2 listener, IInvokedMethod invokedMethod,
        ITestResult testResult, ITestContext testContext) {
      listener.beforeInvocation(invokedMethod, testResult, testContext);
    }
  }

  private static class InvokeAfterInvocationWithoutContextStrategy implements
      InvocationStrategy {
    public void callMethod(IInvokedMethodListener listener, IInvokedMethod invokedMethod,
        ITestResult testResult, ITestContext testContext) {
      listener.afterInvocation(invokedMethod, testResult);
    }
  }

  private static class InvokeAfterInvocationWithContextStrategy implements
      InvocationStrategy {
    public void callMethod(IInvokedMethodListener2 listener, IInvokedMethod invokedMethod,
        ITestResult testResult, ITestContext testContext) {
      listener.afterInvocation(invokedMethod, testResult, testContext);
    }
  }

  private static final Map> strategies = Maps.newHashMap();
  private static final Map
      INVOKE_WITH_CONTEXT_STRATEGIES = Maps.newHashMap();
  private static final Map
      INVOKE_WITHOUT_CONTEXT_STRATEGIES = Maps.newHashMap();

  static {
    INVOKE_WITH_CONTEXT_STRATEGIES.put(BEFORE_INVOCATION,
        new InvokeBeforeInvocationWithContextStrategy());
    INVOKE_WITH_CONTEXT_STRATEGIES.put(AFTER_INVOCATION,
        new InvokeAfterInvocationWithContextStrategy());
    INVOKE_WITHOUT_CONTEXT_STRATEGIES.put(BEFORE_INVOCATION,
        new InvokeBeforeInvocationWithoutContextStrategy());
    INVOKE_WITHOUT_CONTEXT_STRATEGIES.put(AFTER_INVOCATION,
        new InvokeAfterInvocationWithoutContextStrategy());

    strategies.put(EXTENDED_LISTENER, INVOKE_WITH_CONTEXT_STRATEGIES);
    strategies.put(SIMPLE_LISTENER, INVOKE_WITHOUT_CONTEXT_STRATEGIES);
  }
}