Android Open Source - RZAndroidBaseUtils List Utils

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License

The source code is released under:

MIT License

Java Source Code

package com.raizlabs.collections;
/*  www  .  j  a v a2 s  . co m*/
import java.util.List;
import java.util.ListIterator;

import com.raizlabs.functions.Predicate;

/**
 * Collection of utilities for use with {@link List}s.
 * 
 * @author Dylan James
 *
 */
public class ListUtils {
  /**
   * Returns true if the given list is null or empty.
   * @param list The list to check.
   * @return True if the list is null or empty.
   */
  public static boolean isEmpty(List<?> list) {
    return list == null || list.isEmpty();
  }
  
  /**
   * Removes all items from the given list for which the given
   * {@link Predicate} returns false.
   * @param list The list to filter.
   * @param predicate The predicate to run against list items.
   */
  public static <T> void filter(List<? extends T> list, Predicate<T> predicate) {
    ListIterator<? extends T> iter = list.listIterator();
    T currItem = null;
    
    while (iter.hasNext()) {
      currItem = iter.next();
      if (!predicate.evaluate(currItem)) {
        iter.remove();
      }
    }
  }
}

Java Source Code List

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