| /* |
| * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.tools.internal.xjc.reader.gbind; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| |
| /** |
| * A set over a list of {@link Element}. |
| * |
| * @author Kohsuke Kawaguchi |
| */ |
| interface ElementSet extends Iterable<Element> { |
| /** |
| * For each element in this set, adds an edge to the given element. |
| */ |
| void addNext(Element element); |
| |
| public static final ElementSet EMPTY_SET = new ElementSet() { |
| public void addNext(Element element) { |
| // noop |
| } |
| |
| public boolean contains(ElementSet element) { |
| return this==element; |
| } |
| |
| public Iterator<Element> iterator() { |
| return Collections.<Element>emptySet().iterator(); |
| } |
| }; |
| |
| /** |
| * Doesn't have to be strict (it's OK for this method to return false |
| * when it's actually true) since this is used just for optimization. |
| * |
| * (Erring on the other side is NG) |
| */ |
| boolean contains(ElementSet rhs); |
| } |