Java Collection Element Get getCardinalityMap(final Collection coll)

Description

get Cardinality Map

License

Apache License

Declaration

public static <T> Map<T, Integer> getCardinalityMap(final Collection<T> coll) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.*;

public class Main {
    private static Integer INTEGER_ONE = new Integer(1);

    public static <T> Map<T, Integer> getCardinalityMap(final Collection<T> coll) {
        Map count = new HashMap<T, Integer>();
        for (T item : coll) {
            Integer c = (Integer) (count.get(item));
            if (c == null) {
                count.put(item, INTEGER_ONE);
            } else {
                count.put(item, new Integer(c.intValue() + 1));
            }/*from  w w w  .j a  v a 2  s. c  o  m*/
        }
        return count;
    }
}

Related

1. getAuthzNameFromEntityName(String entityName, Collection authzProvidersNames)
2. getByIndex(Collection