TripleKeyHashMap.java

/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2003-2007 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.util;

import java.util.HashMap;
import java.util.Map;

/**
 * @author pugh
 */
public class TripleKeyHashMap<K1, K2, K3, V> {
    Map<K1, DualKeyHashMap<K2, K3, V>> map = new HashMap<K1, DualKeyHashMap<K2, K3, V>>();

    public V get(K1 k1, K2 k2, K3 k3) {
        DualKeyHashMap<K2, K3, V> m = map.get(k1);
        if (m == null)
            return null;
        return m.get(k2, k3);
    }

    public V put(K1 k1, K2 k2, K3 k3, V v) {
        DualKeyHashMap<K2, K3, V> m = map.get(k1);
        if (m == null) {
            m = new DualKeyHashMap<K2, K3, V>();
            map.put(k1, m);
        }
        return m.put(k2, k3, v);
    }

}