opennlp.tools.util.HashList Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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.
*/
@SuppressWarnings("unchecked")
public class HashList extends HashMap {
private static final long serialVersionUID = 1;
public HashList() {
}
public Object get(Object key, int index) {
if (get(key) != null) {
return ((List) get(key)).get(index);
}
else {
return null;
}
}
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;
}
@Override
public List 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;
}
}
}