replace Or Add element in Collection by Predicate - Android java.util

Android examples for java.util:Collection Filter

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Description

replace Or Add element in Collection by Predicate

Demo Code

/*/*from   w w w  . j a v a2  s. c o  m*/
 * This software code is (c) 2010 T-Mobile USA, Inc. All Rights Reserved.
 *
 * Unauthorized redistribution or further use of this material is
 * prohibited without the express permission of T-Mobile USA, Inc. and
 * will be prosecuted to the fullest extent of the law.
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 * Removal or modification of these Terms and Conditions from the source
 * or binary code of this software is prohibited.  In the event that
 * redistribution of the source or binary code for this software is
 * approved by T-Mobile USA, Inc., these Terms and Conditions and the
 * above copyright notice must be reproduced in their entirety and in all
 * circumstances.
 *
 * No name or trademarks of T-Mobile USA, Inc., or of its parent company,
 * Deutsche Telekom AG or any Deutsche Telekom or T-Mobile entity, may be
 * used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" AND "WITH ALL FAULTS" BASIS
 * AND WITHOUT WARRANTIES OF ANY KIND.  ALL EXPRESS OR IMPLIED
 * CONDITIONS, REPRESENTATIONS OR WARRANTIES, INCLUDING ANY IMPLIED
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 * NON-INFRINGEMENT CONCERNING THIS SOFTWARE, ITS SOURCE OR BINARY CODE
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 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE
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 */
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Predicate;

public class Main {
  public static <T> void replaceOrAdd(T elementToAdd, Collection<T> collection,
      Predicate<T> predicate) {
    if (collection == null || elementToAdd == null || predicate == null) {
      throw new IllegalArgumentException();
    }

    T elemToReplace = find(collection, predicate);
    if (elemToReplace != null) {
      collection.remove(elemToReplace);
    }
    collection.add(elementToAdd);
  }

  public static <T> T find(Collection<T> collection, Predicate<T> predicate) {
    List<T> elements = findElements(collection, predicate);
    return elements.size() > 0 ? elements.get(0) : null;
  }

  public static <T> List<T> findElements(Collection<T> collection,
      Predicate<T> predicate) {
    if (collection == null || predicate == null) {
      throw new IllegalArgumentException();
    }

    final List<T> elements = new ArrayList<T>();

    for (T elem : collection) {
      if (predicate.test(elem)) {
        elements.add(elem);
      }
    }

    return elements;
  }
}

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