Examples of java.util.List.retainAll()

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

      {
         lock.readLock().lock();
         try
         {
            List state = getCurrentState(true);
            return state.retainAll(c);
         }
         finally
         {
            lock.readLock().unlock();
         }

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            if(tileIndices != null && tileIndices.length > 0) {
                // Create a Set from the supplied indices.
                List tileIndexList = Arrays.asList(tileIndices);


                // Retain only indices which were actually in the request.
                tileIndexList.retainAll(reqIndexList);


                indices = (Point[])tileIndexList.toArray(new Point[0]);
            } else {
                indices = (Point[])reqIndexList.toArray(new Point[0]);
            }

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            if(tileIndices != null && tileIndices.length > 0) {
                // Create a Set from the supplied indices.
                List tileIndexList = Arrays.asList(tileIndices);


                // Retain only indices which were actually in the request.
                tileIndexList.retainAll(reqIndexList);


                indices = (Point[])tileIndexList.toArray(new Point[0]);
            } else {
                indices = (Point[])reqIndexList.toArray(new Point[0]);
            }

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        public boolean retainAll(Collection o) {
            if (fast) {
                synchronized (FastArrayList.this) {
                    ArrayList temp = (ArrayList) list.clone();
                    List sub = get(temp);
                    boolean r = sub.retainAll(o);
                    if (r) last = first + sub.size();
                    list = temp;
                    expected = temp;
                    return r;
                }

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      } 
      catch (UnsupportedOperationException good) {}
      
      try 
      { 
         fciTargets.retainAll(targets);
         fail("retainAll call did not fail");
      } 
      catch (UnsupportedOperationException good) {}
      
      Iterator iter = fciTargets.iterator();

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        Map taskIDPositions = new HashMap();
        for (Iterator i = nodes.iterator(); i.hasNext();) {
            List taskIDs = ((EVTask) i.next()).getTaskIDs();
            if (intersects(taskIDs, bestIDs)) {
                List l = new LinkedList(taskIDs);
                l.retainAll(bestIDs);
                int pos = 0;
                for (Iterator j = l.iterator(); j.hasNext();) {
                    String taskID = (String) j.next();
                    increment(taskIDPositions, taskID, pos++);
                }

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        List filter = getProcessListPlain("Phase_Display_Filter_List");
        if (filter.isEmpty())
            return phases;
        
        List result = new ArrayList(phases);
        result.retainAll(filter);
        return result;
    }


    public String getProcessString(String stringName) {
        return getProcessString(stringName, true);

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        return result;
    }


    private static void merge(List a, List b) {
        List shared = new ArrayList(b);
        shared.retainAll(a);


        for (Iterator i = shared.iterator(); i.hasNext();) {
            Object element = i.next();
            int aPos = a.indexOf(element);
            int bPos = b.indexOf(element);

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                getLeftResultSet().getAllResultColumns(null);
        ResultColumnList rightRCL =
                getRightResultSet().getAllResultColumns(null);


        List columnNames = extractColumnNames(leftRCL);
        columnNames.retainAll(extractColumnNames(rightRCL));


        ResultColumnList commonColumns =
                (ResultColumnList) getNodeFactory().getNode(
                        C_NodeTypes.RESULT_COLUMN_LIST,
                        getContextManager());

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        public boolean retainAll(Collection o) {
            if (fast) {
                synchronized (FastArrayList.this) {
                    ArrayList temp = (ArrayList) list.clone();
                    List sub = get(temp);
                    boolean r = sub.retainAll(o);
                    if (r) last = first + sub.size();
                    list = temp;
                    expected = temp;
                    return r;
                }

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