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)

        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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                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 void testDelegatingProxyInterfaceOrder()
    {
        final Echo echo = ( Echo ) factory.createDelegatorProxy( createSingletonEcho(), new Class[] { Echo.class, DuplicateEcho.class } );
        final List expected = new LinkedList( Arrays.asList( new Class[] { Echo.class, DuplicateEcho.class } ) );
        final List actual = new LinkedList( Arrays.asList( echo.getClass().getInterfaces() ) );
        actual.retainAll( expected );  // Doesn't alter order!
        assertEquals( expected, actual );
    }


    public void testCreateDelegatingProxy()
    {

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    }
    
    /** Tests retainAll(Collection c) */
    public void test_retainAll() { 
        List a = defaultList();
        a.retainAll(defaultList());
        TestSupport.assertEquals(a, defaultList(), 
            "retainAll(<equal List>) does not equal original list");
        a = defaultList();
        a.retainAll(newInstance(null));
        TestSupport.assertThat(a.size() == 0,

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        List a = defaultList();
        a.retainAll(defaultList());
        TestSupport.assertEquals(a, defaultList(), 
            "retainAll(<equal List>) does not equal original list");
        a = defaultList();
        a.retainAll(newInstance(null));
        TestSupport.assertThat(a.size() == 0,
            "retainAll(<empty List>))does not have size of zero");
        
        a = defaultList();
        a.remove(0);

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                clientClassProperties = Collections.EMPTY_LIST;
            }


            // there is a bug in EOModeler it sometimes keeps outdated properties in
            // the client property list. This removes them
            clientClassProperties.retainAll(classProperties);


            // remove all properties from the entity properties that are already defined
            // in
            // a potential parent class.
            String parentEntity = (String) entityPlistMap.get("parent");

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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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                clientClassProperties = Collections.EMPTY_LIST;
            }


            // there is a bug in EOModeler it sometimes keeps outdated properties in
            // the client property list. This removes them
            clientClassProperties.retainAll(classProperties);


            // remove all properties from the entity properties that are already defined
            // in
            // a potential parent class.
            String parentEntity = (String) entityPlistMap.get("parent");

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            try
            {
                List groups = new ArrayList(registry.getGroupsForUser(principal.getName()));


                groups.retainAll(roles);
               
                // if authorization succeeds, set the user's Subject on this invocation context
                // so that the rest of the Thread is executed in the context of the appropriate Subject
                if (groups.size() > 0)
                    ContextManagerFactory.getInstance().setCallerSubject(((WSLCPrincipal)principal).getSubject());

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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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