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/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.impl.adt;
import java.util.ArrayList;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.List;
/**
* A poor man's multimap, used only to reduce the complexity code that deals
* with these otherwise painful structures.
*
* @author <a href="mailto:jesse@swank.ca">Jesse Wilson</a>
*/
public class IdentityMultimap<K,V> extends IdentityHashMap<K, List<V>> {
public void addValue(K key, V value) {
List<V> values = super.get(key);
if(values == null) {
values = new ArrayList<V>(2);
put(key, values);
}
values.add(value);
}
@Override
public List<V> get(Object key) {
List<V> values = super.get(key);
return values == null ? Collections.<V>emptyList() : values;
}
public int count(Object key) {
List<V> values = super.get(key);
return values == null ? 0 : values.size();
}
}
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