001 /** 002 * ================================================ 003 * LibLoader : a free Java resource loading library 004 * ================================================ 005 * 006 * Project Info: http://reporting.pentaho.org/libloader/ 007 * 008 * (C) Copyright 2006, by Pentaho Corporation and Contributors. 009 * 010 * This library is free software; you can redistribute it and/or modify it under the terms 011 * of the GNU Lesser General Public License as published by the Free Software Foundation; 012 * either version 2.1 of the License, or (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 016 * See the GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public License along with this 019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 020 * Boston, MA 02111-1307, USA. 021 * 022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 023 * in the United States and other countries.] 024 * 025 * 026 * ------------ 027 * $Id: SimpleResource.java 3520 2007-10-16 10:34:47Z tmorgner $ 028 * ------------ 029 * (C) Copyright 2006, by Pentaho Corporation. 030 */ 031 package org.jfree.resourceloader; 032 033 /** 034 * A simple resource with only a single dependency. 035 * 036 * @author Thomas Morgner 037 */ 038 public class SimpleResource implements Resource 039 { 040 private Object value; 041 private ResourceKey key; 042 private long version; 043 044 public SimpleResource(final ResourceKey key, 045 final Object value, 046 final long version) 047 { 048 if (key == null) 049 { 050 throw new NullPointerException(); 051 } 052 this.value = value; 053 this.key = key; 054 this.version = version; 055 } 056 057 public Object getResource() 058 { 059 return value; 060 } 061 062 public long getVersion(final ResourceKey key) 063 { 064 if (key.equals(this.key)) 065 { 066 return version; 067 } 068 // -1 is the placeholder for: not known. 069 return -1; 070 } 071 072 /** 073 * The primary source is also included in this set. The dependencies are given 074 * as ResourceKey objects. The keys itself do not hold any state information. 075 * <p/> 076 * The dependencies do not track deep dependencies. So if Resource A depends 077 * on Resource B which depends on Resource C, then A only knows about B, not 078 * C. 079 * 080 * @return 081 */ 082 public ResourceKey[] getDependencies() 083 { 084 return new ResourceKey[]{getSource()}; 085 } 086 087 public ResourceKey getSource() 088 { 089 return key; 090 } 091 }