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SimpleResource.java

/**
 * ================================================
 * LibLoader : a free Java resource loading library
 * ================================================
 *
 * Project Info:  http://reporting.pentaho.org/libloader/
 *
 * (C) Copyright 2006, by Pentaho Corporation and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 *
 * ------------
 * $Id: SimpleResource.java,v 1.3 2007/04/01 13:43:17 taqua Exp $
 * ------------
 * (C) Copyright 2006, by Pentaho Corporation.
 */
package org.jfree.resourceloader;

/**
 * A simple resource with only a single dependency.
 *
 * @author Thomas Morgner
 */
00038 public class SimpleResource implements Resource
{
  private Object value;
  private ResourceKey key;
  private long version;

  public SimpleResource(final ResourceKey key,
                        final Object value,
                        final long version)
  {
    if (key == null)
    {
      throw new NullPointerException();
    }
    this.value = value;
    this.key = key;
    this.version = version;
  }

  public Object getResource()
  {
    return value;
  }

  public long getVersion(ResourceKey key)
  {
    if (key.equals(this.key))
    {
      return version;
    }
    // -1 is the placeholder for: not known.
    return -1;
  }

  /**
   * The primary source is also included in this set. The dependencies are given
   * as ResourceKey objects. The keys itself do not hold any state information.
   * <p/>
   * The dependencies do not track deep dependencies. So if Resource A depends
   * on Resource B which depends on Resource C, then A only knows about B, not
   * C.
   *
   * @return
   */
00082   public ResourceKey[] getDependencies()
  {
    return new ResourceKey[]{getSource()};
  }

  public ResourceKey getSource()
  {
    return key;
  }
}

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