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.cmdline.spi; 021 022 /** 023 * A typed string, this class should be extended to provide meta information about a string and provide type safety. 024 * This class is immutable and so should be its subclasses. 025 * 026 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 027 * @version $Revision$ 028 */ 029 public abstract class Value { 030 031 /** . */ 032 private final String string; 033 034 /** 035 * The only constructors that accepts a string. 036 * 037 * @param string the string value 038 * @throws NullPointerException if the string is null 039 */ 040 public Value(String string) throws NullPointerException { 041 if (string == null) { 042 throw new NullPointerException("No null string accepted"); 043 } 044 this.string = string; 045 } 046 047 @Override 048 public int hashCode() { 049 return getClass().hashCode() ^ string.hashCode(); 050 } 051 052 @Override 053 public boolean equals(Object obj) { 054 if (obj == this) { 055 return true; 056 } else if (obj != null && obj.getClass().equals(getClass())) { 057 Value that = (Value)obj; 058 return string.equals(that.string); 059 } 060 return false; 061 } 062 063 /** 064 * Returns the string value. 065 * 066 * @return the string value 067 */ 068 public final String getString() { 069 return string; 070 } 071 072 @Override 073 public final String toString() { 074 return string; 075 } 076 }