/*
* Copyright (c) 2005, 2006, 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.
*
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*/
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);
}