Mega Code Archive
Class which creates mapping between keys and a list of values
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///////////////////////////////////////////////////////////////////////////////
//Copyright (C) 2003 Jeremy LaCivita
//
//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 program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//////////////////////////////////////////////////////////////////////////////
//package opennlp.tools.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
/**
* Class which creates mapping between keys and a list of values.
*/
public class HashList extends HashMap {
private static final long serialVersionUID = 1;
public HashList() {
super();
}
public Object get(Object key, int index) {
if (get(key) == null) {
return get(key);
}
else {
return ((List)get(key)).get(index);
}
}
public Object putAll(Object key, Collection values) {
List o = (List)get(key);
if (o == null) {
o = new ArrayList();
super.put(key, o);
}
o.addAll(values);
if (o.size() == values.size())
return null;
else
return o;
}
public Object put(Object key, Object value) {
List o = (List)get(key);
if (o == null) {
o = new ArrayList();
super.put(key, o);
}
o.add(value);
if(o.size() == 1)
return null;
else
return o;
}
public boolean remove(Object key, Object value) {
List l = (List) get(key);
if (l == null) {
return false;
}
else {
boolean r = l.remove(value);
if (l.size() == 0) {
remove(key);
}
return r;
}
}
}
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