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: CompoundResource.java 3520 2007-10-16 10:34:47Z tmorgner $
028 * ------------
029 * (C) Copyright 2006, by Pentaho Corporation.
030 */
031
032 package org.jfree.resourceloader;
033
034 /**
035 * Creation-Date: 08.04.2006, 14:08:13
036 *
037 * @author Thomas Morgner
038 */
039 public class CompoundResource implements Resource
040 {
041 private ResourceKey source;
042 private DependencyCollector dependencies;
043 private Object product;
044
045 public CompoundResource(final ResourceKey source,
046 final DependencyCollector dependencies,
047 final Object product)
048 {
049 if (source == null)
050 {
051 throw new NullPointerException("Source must not be null");
052 }
053 if (dependencies == null)
054 {
055 throw new NullPointerException("Dependecies must be given.");
056 }
057 if (product == null)
058 {
059 throw new NullPointerException("Product must not be null");
060 }
061 this.source = source;
062 try
063 {
064 this.dependencies = (DependencyCollector) dependencies.clone();
065 }
066 catch (CloneNotSupportedException e)
067 {
068 throw new IllegalStateException
069 ("Clone not supported? This should not happen.");
070 }
071 this.product = product;
072 }
073
074 public Object getResource() throws ResourceException
075 {
076 return product;
077 }
078
079 public long getVersion(final ResourceKey key)
080 {
081 return dependencies.getVersion(key);
082 }
083
084 /**
085 * The primary source is also included in this set. The dependencies are given
086 * as ResourceKey objects. The keys itself do not hold any state information.
087 * <p/>
088 * The dependencies do not track deep dependencies. So if Resource A depends
089 * on Resource B which depends on Resource C, then A only knows about B, not
090 * C.
091 *
092 * @return
093 */
094 public ResourceKey[] getDependencies()
095 {
096 return dependencies.getDependencies();
097 }
098
099 public ResourceKey getSource()
100 {
101 return source;
102 }
103 }