Examples of java.util.Collection.retainAll()

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

      {
         //start FLUSH only on group members that we need to flush
         if (view != null)
         {
            participantsInFlush = new ArrayList(view.getMembers());
            participantsInFlush.retainAll(currentView.getMembers());
         }
         else
         {
            participantsInFlush = new ArrayList(currentView.getMembers());
         }

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        }


        boolean added_b = b.add("element1");
        try {
            assertTrue(!a.retainAll(b));
            assertTrue(added_b == b.retainAll(a));
            assertTrue(b.isEmpty());
        } catch(UnsupportedOperationException e) {
            // expected
        } catch(Throwable t) {
            t.printStackTrace();

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        boolean added_b1 = b.add("element1");
        boolean added_b2 = b.add("element2");
        boolean added_a1 = a.add("element1");
        if(added_b1 && added_b2 && added_a1) {
            try {
                assertTrue(!b.retainAll(b));
                assertTrue(b.contains("element1"));
                assertTrue(b.contains("element2"));


                assertTrue(!a.retainAll(b));

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                assertTrue(b.contains("element1"));
                assertTrue(b.contains("element2"));


                assertTrue(!a.retainAll(b));


                assertTrue(b.retainAll(a));
                assertTrue(b.contains("element1"));
                assertTrue(!b.contains("element2"));
            } catch(UnsupportedOperationException e) {
                // expected
            } catch(Throwable t) {

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            result.put(added, properties.getSVNPropertyValue(added));
        }


        // changed in props2
        tmp = new TreeSet(props2);
        tmp.retainAll(props1);
        
        for (Iterator props = tmp.iterator(); props.hasNext();) {
            String changed = (String) props.next();
            SVNPropertyValue value1 = getSVNPropertyValue(changed);
            SVNPropertyValue value2 = properties.getSVNPropertyValue(changed);

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        }


        boolean added_b = b.add("element1");
        try {
            assertTrue(!a.retainAll(b));
            assertTrue(added_b == b.retainAll(a));
            assertTrue(b.isEmpty());
        } catch(UnsupportedOperationException e) {
            // expected
        } catch(Throwable t) {
            t.printStackTrace();

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        boolean added_b1 = b.add("element1");
        boolean added_b2 = b.add("element2");
        boolean added_a1 = a.add("element1");
        if(added_b1 && added_b2 && added_a1) {
            try {
                assertTrue(!b.retainAll(b));
                assertTrue(b.contains("element1"));
                assertTrue(b.contains("element2"));


                assertTrue(!a.retainAll(b));

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                assertTrue(b.contains("element1"));
                assertTrue(b.contains("element2"));


                assertTrue(!a.retainAll(b));


                assertTrue(b.retainAll(a));
                assertTrue(b.contains("element1"));
                assertTrue(!b.contains("element2"));
            } catch(UnsupportedOperationException e) {
                // expected
            } catch(Throwable t) {

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        return element;
    }


    public boolean removeAll(final Collection c) {
        final Collection removed = new ArrayList(c);
        removed.retainAll(delegate);
        return detachAllListeners(removed, delegate.removeAll(c));
    }


    public boolean retainAll(final Collection c) {
        final Collection removed = new ArrayList(this);

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        return detachAllListeners(removed, delegate.removeAll(c));
    }


    public boolean retainAll(final Collection c) {
        final Collection removed = new ArrayList(this);
        removed.retainAll(c);
        return detachAllListeners(removed, delegate.retainAll(c));
    }


    public Object set(final int index, final Object element) {
        final Object removed = delegate.set(index, element);

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