Examples of java.util.Set.retainAll()

java.util.Set.retainAll()
Retains only the elements in this set that are contained in the specified collection (optional operation). In other words, removes from this set all of its elements that are not contained in the specified collection. If the specified collection is also a set, this operation effectively modifies this set so that its value is the intersection of the two sets. @param c collection containing elements to be retained in this set @return true if this set changed as a result of the call @throws UnsupportedOperationException if the retainAll operationis not supported by this set @throws ClassCastException if the class of an element of this setis incompatible with the specified collection (optional) @throws NullPointerException if this set contains a null element and thespecified collection does not permit null elements (optional), or if the specified collection is null @see #remove(Object)

/*      */ 
/*  908 */       c = nav().getSuperClass(c);
/*  909 */     }while (shouldRecurseSuperClass(c));
/*      */ 
/*  913 */     Set complete = new TreeSet(getters.keySet());
/*  914 */     complete.retainAll(setters.keySet());
/*      */ 
/*  916 */     resurrect(getters, complete);
/*  917 */     resurrect(setters, complete);
/*      */ 
/*  920 */     for (String name : complete) {

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         {
            transactionIds.clear();
         }
         else if (a.getType() == MultiIndex.Action.TYPE_VOLATILE_COMMIT)
         {
            transactionIds.retainAll(losers);
            // check if transactionIds contains losers
            if (transactionIds.size() > 0)
            {
               // found dirty volatile commit
               break;

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      blacklistClone.putAll(globalBlacklist);
    }
    Set keys = blacklistClone.keySet();
    
    // we're only interested in blacklisted hosts that are in the hostList
    keys.retainAll(this.hostList);
    if(keys.size() == this.hostList.size()){
      // return an empty blacklist, let the BalanceStrategy implementations try to connect to everything
      // since it appears that all hosts are unavailable - we don't want to wait for 
      // loadBalanceBlacklistTimeout to expire.
      return new HashMap(1);

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    private static Method getCallbackMethod(Class cls) {
        // Look at only public methods defined by the Callback class
        Method[] pubMethods = cls.getDeclaredMethods();
        Method[] classMethods = cls.getMethods();
        Set pmethods = new HashSet(Arrays.asList(pubMethods));
        pmethods.retainAll(Arrays.asList(classMethods));


        // Remove Object methods disallowed as callback method names 
        for (Iterator i=pmethods.iterator();i.hasNext();) {
            Method m = (Method)i.next();
            if (Callback.FORBIDDEN_NAMES.contains(m.getName())) {

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    private static Method getCallbackMethod(Class cls) {
        // Look at only public methods defined by the Callback class
        Method[] pubMethods = cls.getDeclaredMethods();
        Method[] classMethods = cls.getMethods();
        Set pmethods = new HashSet(Arrays.asList(pubMethods));
        pmethods.retainAll(Arrays.asList(classMethods));


        // Remove Object methods disallowed as callback method names 
        for (Iterator i=pmethods.iterator();i.hasNext();) {
            Method m = (Method)i.next();
            if (Callback.FORBIDDEN_NAMES.contains(m.getName())) {

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      // first construct a set containing all the elements in orig
      Set items = new HashSet(Arrays.asList(orig));


      // then remove all those not in rev
      items.retainAll(Arrays.asList(rev));


      Map eqs = new HashMap();
      for (int i = 0; i < orig.length; i++)
      {
         // if its a common item and hasn't been found before

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     * @param grailsDomainClasses the collection of valid sub-classes
     * @return the collection of subclasses, if any
     */
    public static Collection getSubClasses(GrailsDomainClass grailsDomainClass, Collection grailsDomainClasses) {
        Set subClasses = new HashSet(grailsDomainClass.getSubClasses());
        subClasses.retainAll(grailsDomainClasses);
        return subClasses;
    }


    /**
     * Get the parent GrailsDomainClass for the given GrailsDomainClass, if it

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    Set those = plugin.getPeerGroups();
    if (those == null || those.isEmpty())
      return true;


    // We check for a single match.
    those.retainAll(peerGroups.entrySet());
    if (those.isEmpty())
      // No common elements
      return false;


    if (! strict)

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      return true;


    // Determine relevant keys
    Set myKeys = getPeerGroupNames();


    myKeys.retainAll(plugin.getPeerGroupNames());


    // Check for other peer groups
    for (Iterator it = myKeys.iterator(); it.hasNext();)
    {
      String next = (String) it.next();

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