MeldablePQ.java

/*******************************************************************************
 * Copyright (c) 2012-present Jakub Kováč, Jozef Brandýs, Katarína Kotrlová,
 * Pavol Lukča, Ladislav Pápay, Viktor Tomkovič, Tatiana Tóthová
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package algvis.ds.priorityqueues;

import java.util.Hashtable;

import algvis.core.history.HashtableStoreSupport;
import algvis.ui.VisPanel;
import algvis.ui.view.Highlighting;

abstract public class MeldablePQ extends PriorityQueue implements Highlighting {
    public static String adtName = "meldable-pq";

    public static final int numHeaps = 10;
    public int active = 1;

    protected MeldablePQ(VisPanel M) {
        super(M);
    }

    abstract public void meld(int i, int j);

    @Override
    public void storeState(Hashtable<Object, Object> state) {
        super.storeState(state);
        HashtableStoreSupport.store(state, hash + "active", active);
    }

    @Override
    public void restoreState(Hashtable<?, ?> state) {
        super.restoreState(state);
        final Object active = state.get(hash + "active");
        if (active != null) {
            this.active = (Integer) HashtableStoreSupport.restore(active);
            final MeldablePQButtons buttons = ((MeldablePQButtons) panel.buttons);
            buttons.activeHeap.removeChangeListener(buttons);
            buttons.activeHeap.setValue(HashtableStoreSupport.restore(active));
            buttons.activeHeap.addChangeListener(buttons);
        }
    }
}