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Java 1.8+ Library with tons of utility classes required in all projects

There is a newer version: 11.1.10

/*
 * Copyright (C) 2014-2022 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.hierarchy;

import java.util.Collection;

import javax.annotation.Nullable;

import com.helger.commons.equals.EqualsHelper;
import com.helger.commons.id.IHasID;

/**
 * An implementation of the {@link IChildrenProviderWithID} interface that works
 * with all types that implement {@link IHasChildren} and {@link IHasID}.
 *
 * @author Philip Helger
 * @param 
 *        The key type.
 * @param 
 *        The data type of the child objects.
 */
public class ChildrenProviderHasChildrenWithID  & IHasID > extends
                                               ChildrenProviderHasChildren  implements
                                               IChildrenProviderWithID 
{
  @Nullable
  public CHILDTYPE getChildWithID (@Nullable final CHILDTYPE aCurrent, @Nullable final KEYTYPE aID)
  {
    if (aCurrent != null)
    {
      // Get all children (if any)
      final Collection  aChildren = aCurrent.getAllChildren ();
      if (aChildren != null)
        for (final CHILDTYPE aChild : aChildren)
          if (aChild != null && EqualsHelper.equals (aChild.getID (), aID))
            return aChild;
    }
    return null;
  }
}