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: DependencyCollector.java 2713 2007-04-01 13:43:18Z taqua $
028 * ------------
029 * (C) Copyright 2006, by Pentaho Corporation.
030 */
031 package org.jfree.resourceloader;
032
033 import java.util.HashMap;
034 import java.io.Serializable;
035
036 /**
037 * Creation-Date: 08.04.2006, 14:12:14
038 *
039 * @author Thomas Morgner
040 */
041 public class DependencyCollector implements Serializable, Cloneable
042 {
043 private HashMap dependencies;
044
045 public DependencyCollector(final ResourceKey source,
046 final long version)
047 {
048 if (source == null)
049 {
050 throw new NullPointerException();
051 }
052 dependencies = new HashMap();
053 dependencies.put(source, new Long(version));
054 }
055
056 public ResourceKey[] getDependencies()
057 {
058 return (ResourceKey[]) dependencies.keySet().toArray
059 (new ResourceKey[dependencies.size()]);
060 }
061
062 public void add(final Resource dependentResource)
063 {
064 final ResourceKey[] depKeys = dependentResource.getDependencies();
065 for (int i = 0; i < depKeys.length; i++)
066 {
067 final ResourceKey depKey = depKeys[i];
068 final long version = dependentResource.getVersion(depKey);
069 add(depKey, version);
070 }
071 }
072
073 public void add(final ResourceKey resourceKey, final long version)
074 {
075 dependencies.put(resourceKey, new Long(version));
076 }
077
078 public long getVersion(final ResourceKey key)
079 {
080 final Long l = (Long) dependencies.get(key);
081 if (l == null)
082 {
083 return -1;
084 }
085 return l.longValue();
086 }
087
088 public Object clone () throws CloneNotSupportedException
089 {
090 final DependencyCollector dc = (DependencyCollector) super.clone();
091 dc.dependencies = (HashMap) dependencies.clone();
092 return dc;
093 }
094 }