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package org.eclipse.xtend.backend.util;

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


/**
 * 
 * @author Arno Haase (http://www.haase-consulting.com)
 */
public abstract class DoubleKeyCache<K1, K2, V> {
    private final Map<Pair<K1, K2>, V> _cache = new HashMap<Pair <K1, K2>, V>();
    
    public V get (K1 key1, K2 key2) {
        final Pair<K1, K2> key = new Pair<K1, K2> (key1, key2);
        
        if (_cache.containsKey (key))
            return _cache.get (key);
        
        final V result = create (key1, key2);
        _cache.put (key, result);
        return result;
    }

    protected abstract V create (K1 key1, K2 key2);
    
    public Map<Pair<K1, K2>, V> getMap () {
        return _cache;
    }
}