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Testing framework for Java
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package org.testng.internal;


import org.testng.ITestNGMethod;
import org.testng.collections.Lists;
import org.testng.collections.Maps;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * This class wraps access to beforeGroups and afterGroups methods,
 * since they are passed around the various invokers and potentially
 * modified in different threads.
 *
 * @author Cedric Beust
 * @author Alexandru Popescu
 * @since 5.3 (Mar 2, 2006)
 */
public class ConfigurationGroupMethods implements Serializable {
  /** Use serialVersionUID for interoperability. */
  private final static long serialVersionUID= 1660798519864898480L;

  /** The list of beforeGroups methods keyed by the name of the group */
  private final Map> m_beforeGroupsMethods;

  /** The list of afterGroups methods keyed by the name of the group */
  private final Map> m_afterGroupsMethods;

  /** The list of all test methods */
  private final ITestNGMethod[] m_allMethods;

  /**A map that returns the last method belonging to the given group */
  private Map> m_afterGroupsMap= null;

  public ConfigurationGroupMethods(ITestNGMethod[] allMethods,
                                   Map> beforeGroupsMethods,
                                   Map> afterGroupsMethods)
  {
    m_allMethods= allMethods;
    m_beforeGroupsMethods= beforeGroupsMethods;
    m_afterGroupsMethods= afterGroupsMethods;
  }

  public Map> getBeforeGroupsMethods() {
    return m_beforeGroupsMethods;
  }

  public Map> getAfterGroupsMethods() {
    return m_afterGroupsMethods;
  }

  /**
   * @return true if the passed method is the last to run for the group.
   * This method is used to figure out when is the right time to invoke
   * afterGroups methods.
   */
  public synchronized boolean isLastMethodForGroup(String group, ITestNGMethod method) {

    // If we have more invocation to do, this is not the last one yet
    if(method.hasMoreInvocation()) {
      return false;
    }

    // Lazy initialization since we might never be called
    if(m_afterGroupsMap == null) {
      m_afterGroupsMap= initializeAfterGroupsMap();
    }

    List methodsInGroup= m_afterGroupsMap.get(group);

    if(null == methodsInGroup || methodsInGroup.isEmpty()) {
      return false;
    }

    methodsInGroup.remove(method);

    // Note:  == is not good enough here as we may work with ITestNGMethod clones
    return methodsInGroup.isEmpty();

  }

  private synchronized Map> initializeAfterGroupsMap() {
    Map> result= Maps.newHashMap();
    for(ITestNGMethod m : m_allMethods) {
      String[] groups= m.getGroups();
      for(String g : groups) {
        List methodsInGroup= result.get(g);
        if(null == methodsInGroup) {
          methodsInGroup= Lists.newArrayList();
          result.put(g, methodsInGroup);
        }
        methodsInGroup.add(m);
      }
    }

    return result;
  }

  public synchronized void removeBeforeMethod(String group, ITestNGMethod method) {
    List methods= m_beforeGroupsMethods.get(group);
    if(methods != null) {
      Object success= methods.remove(method);
      if(success == null) {
        log("Couldn't remove beforeGroups method " + method + " for group " + group);
      }
    }
    else {
      log("Couldn't find any beforeGroups method for group " + group);
    }
  }

  private void log(String string) {
    Utils.log("ConfigurationGroupMethods", 2, string);
  }

  synchronized public Map> getBeforeGroupsMap() {
    return m_beforeGroupsMethods;
  }

  synchronized public Map> getAfterGroupsMap() {
    return m_afterGroupsMethods;
  }

  synchronized public void removeBeforeGroups(String[] groups) {
    for(String group : groups) {
//      log("Removing before group " + group);
      m_beforeGroupsMethods.remove(group);
    }
  }

  synchronized public void removeAfterGroups(Collection groups) {
    for(String group : groups) {
//      log("Removing before group " + group);
      m_afterGroupsMethods.remove(group);
    }

  }

}