001 /* 002 * Copyright (C) 2010 eXo Platform SAS. 003 * 004 * This is free software; you can redistribute it and/or modify it 005 * under the terms of the GNU Lesser General Public License as 006 * published by the Free Software Foundation; either version 2.1 of 007 * the License, or (at your option) any later version. 008 * 009 * This software is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * You should have received a copy of the GNU Lesser General Public 015 * License along with this software; if not, write to the Free 016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 018 */ 019 020 package org.crsh.util; 021 022 import java.util.ArrayList; 023 import java.util.HashMap; 024 import java.util.HashSet; 025 import java.util.LinkedList; 026 import java.util.List; 027 028 /** 029 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 030 * @version $Revision$ 031 */ 032 public class Utils { 033 034 public static <E> ArrayList<E> newArrayList() { 035 return new ArrayList<E>(); 036 } 037 038 public static <E> LinkedList<E> newLinkedList() { 039 return new LinkedList<E>(); 040 } 041 042 public static <E> HashSet<E> newHashSet() { 043 return new HashSet<E>(); 044 } 045 046 public static <K, V> HashMap<K, V> newHashMap() { 047 return new HashMap<K, V>(); 048 } 049 050 public static <E>List<E> list(Iterable<E> iterable) { 051 ArrayList<E> list = new ArrayList<E>(); 052 for (E t : iterable) { 053 list.add(t); 054 } 055 return list; 056 } 057 058 public static String trimLeft(String s) { 059 if (s == null) { 060 throw new NullPointerException("No null string accepted"); 061 } 062 int index = 0; 063 int len = s.length(); 064 while (index < len) { 065 if (s.charAt(index) == ' ') { 066 index++; 067 } else { 068 break; 069 } 070 } 071 if (index > 0) { 072 return s.substring(index); 073 } else { 074 return s; 075 } 076 } 077 }