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Statistical sampling library for use in virtdata libraries, based
on apache commons math 4
/*
* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.runtime.misc;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
public class MultiMap extends LinkedHashMap> {
public void map(K key, V value) {
List elementsForKey = get(key);
if ( elementsForKey==null ) {
elementsForKey = new ArrayList();
super.put(key, elementsForKey);
}
elementsForKey.add(value);
}
public List> getPairs() {
List> pairs = new ArrayList>();
for (K key : keySet()) {
for (V value : get(key)) {
pairs.add(new Pair(key, value));
}
}
return pairs;
}
}