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Miscellaneous Utilities (Pure Java)

There is a newer version: 2.1.0

package com.simiacryptus.collections;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.atomic.AtomicInteger;

import com.google.common.collect.Maps;
import com.google.common.collect.Maps.EntryTransformer;

public class CountCollection>
{
  
  protected final C map;
  
  public CountCollection(final C collection)
  {
    super();
    this.map = collection;
  }
  
  public int add(final T bits)
  {
    return this.getCounter(bits).incrementAndGet();
  }
  
  public int add(final T bits, final int count)
  {
    return this.getCounter(bits).addAndGet(count);
  }
  
  protected int count(final T key)
  {
    final AtomicInteger counter = this.map.get(key);
    if (null == counter) { return 0; }
    return counter.get();
  }
  
  private AtomicInteger getCounter(final T bits)
  {
    AtomicInteger counter = this.map.get(bits);
    if (null == counter)
    {
      counter = new AtomicInteger();
      this.map.put(bits, counter);
    }
    return counter;
  }
  
  public List getList()
  {
    final ArrayList list = new ArrayList();
    for (final Entry e : this.map.entrySet())
    {
      for (int i = 0; i < e.getValue().get(); i++)
      {
        list.add(e.getKey());
      }
    }
    return list;
  }
  
  public Map getMap()
  {
    return Maps.transformEntries(this.map,
        new EntryTransformer() {
          @Override
          public Integer transformEntry(final T key, final AtomicInteger value)
          {
            return value.get();
          }
        });
  }
  
}