@@ -0,0 +1,1509 @@
+/* This file is part of SableCC ( http://sablecc.org ).%0A * %0A * See the NOTICE file distributed with this work for copyright information.%0A *%0A * Licensed under the Apache License, Version 2.0 (the %22License%22);%0A * you may not use this file except in compliance with the License.%0A * You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage org.sablecc.sablecc.util;%0A%0Aimport java.util.HashSet;%0Aimport java.util.LinkedHashSet;%0Aimport java.util.Set;%0A%0Aimport org.sablecc.sablecc.exception.InternalException;%0A%0Apublic class WorkSet%3CT%3E %7B%0A%0A    private final Set%3CT%3E done = new HashSet%3CT%3E();%0A%0A    private final LinkedHashSet%3CT%3E toDo = new LinkedHashSet%3CT%3E();%0A%0A    public boolean hasNext() %7B%0A%0A        return !this.toDo.isEmpty();%0A    %7D%0A%0A    public T next() %7B%0A%0A        T next = this.toDo.iterator().next();%0A%0A        this.toDo.remove(next);%0A        this.done.add(next);%0A%0A        return next;%0A    %7D%0A%0A    public void add(%0A            T element) %7B%0A%0A        if (element == null) %7B%0A            throw new InternalException(%22element may not be null%22);%0A        %7D%0A%0A        if (!this.done.contains(element)) %7B%0A            this.toDo.add(element);%0A        %7D%0A    %7D%0A%7D%0A

Add class to manage work sets.