com.facebook.presto.jdbc.internal.jol.util.Multiset Maven / Gradle / Ivy
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* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.facebook.presto.jdbc.internal.jol.util;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* Naive HashMultiset.
*
* @param element type
* @author Aleksey Shipilev
*/
public class Multiset {
private final Map map = new HashMap();
public void add(T t) {
add(t, 1);
}
public void add(T key, int count) {
Integer v = map.get(key);
if (v == null) {
v = 0;
}
v += count;
map.put(key, v);
}
public int count(T key) {
Integer v = map.get(key);
return (v == null) ? 0 : v;
}
public Collection keys() {
return map.keySet();
}
public long size() {
long size = 0;
for (T k : keys()) {
size += count(k);
}
return size;
}
}