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Java 1.6+ Library with tons of utility classes required in all projects

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/**
 * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * Licensed 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 com.helger.commons.collection.ext;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.CollectionHelper;

/**
 * A special {@link HashMap} implementation based on {@link ICommonsMap}.
 *
 * @author Philip Helger
 * @param 
 *        Map key type
 * @param 
 *        Map value type
 */
public class CommonsHashMap  extends HashMap 
                            implements ICommonsMap 
{
  public CommonsHashMap ()
  {}

  public CommonsHashMap (@Nonnegative final int nInitialCapacity)
  {
    super (nInitialCapacity);
  }

  public CommonsHashMap (@Nonnegative final int nInitialCapacity, @Nonnegative final float fLoadFactor)
  {
    super (nInitialCapacity, fLoadFactor);
  }

  public CommonsHashMap (@Nullable final Map  aMap)
  {
    super (CollectionHelper.getSize (aMap));
    if (aMap != null)
      putAll (aMap);
  }

  public  CommonsHashMap (@Nullable final Collection  aValues,
                                    @Nonnull final Function  aKeyMapper,
                                    @Nonnull final Function  aValueMapper)
  {
    super (CollectionHelper.getSize (aValues));
    putAll (aValues, aKeyMapper, aValueMapper);
  }

  @Nonnull
  @ReturnsMutableCopy
  public  CommonsHashMap  createInstance ()
  {
    return new CommonsHashMap<> ();
  }

  @Nonnull
  @ReturnsMutableCopy
  public CommonsHashMap  getClone ()
  {
    return new CommonsHashMap<> (this);
  }
}