Slice a list : List « Collections Data Structure « Java






Slice a list

     

/**
 * Vosao CMS. Simple CMS for Google App Engine.
 * 
 * Copyright (C) 2009-2010 Vosao development team.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * email: vosao.dev@gmail.com
 */

//package org.vosao.utils;

import java.util.ArrayList;
import java.util.List;

public class ListUtil {

  public static interface Filter<T> {
    public boolean filter(T entity);
  }
  
  public static <T> List<T> filter(List<T> list, Filter<T> filter) {
    List<T> result = new ArrayList<T>();
    for (T entity : list) {
      if (filter.filter(entity)) {
        result.add(entity);
      }
    }
    return result;
  }
  
  public static <T> List<T> slice(List<T> list, int index, int count) {
    List<T> result = new ArrayList<T>();
    if (index >= 0 && index < list.size()) {
      int end = index + count < list.size() ? index + count : list.size();
      for (int i = index; i < end; i++) {
        result.add(list.get(i));
      }
    }
    return result;
  }
  
}

   
    
    
    
    
  








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