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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