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ClassloaderResourceData.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: ClassloaderResourceData.java,v 1.5 2007/04/01 13:43:17 taqua Exp $
 * ------------
 * (C) Copyright 2006, by Pentaho Corporation.
 */
00031 package org.jfree.resourceloader.loader.resource;

import java.io.InputStream;

import org.jfree.resourceloader.ResourceData;
import org.jfree.resourceloader.ResourceKey;
import org.jfree.resourceloader.ResourceLoadingException;
import org.jfree.resourceloader.ResourceManager;
import org.jfree.resourceloader.loader.AbstractResourceData;
import org.jfree.resourceloader.loader.LoaderUtils;
import org.jfree.util.ObjectUtilities;

/**
 * Creation-Date: 05.04.2006, 15:15:36
 *
 * @author Thomas Morgner
 */
00048 public class ClassloaderResourceData extends AbstractResourceData
{
  private ResourceKey key;
  private String resourcePath;

  public ClassloaderResourceData(final ResourceKey key)
  {
    if (key == null)
    {
      throw new NullPointerException();
    }
    this.key = key;
    final String rawPath = (String) key.getIdentifier();
    this.resourcePath = rawPath.substring(6);
  }

  public InputStream getResourceAsStream(ResourceManager caller) throws ResourceLoadingException
  {
    final InputStream stream = ObjectUtilities.getResourceAsStream
        (resourcePath, ClassloaderResourceData.class);
    if (stream == null)
    {
      throw new ResourceLoadingException("Resource is not available: " + resourcePath);
    }
    return stream;
  }

  public Object getAttribute(String key)
  {
    // we do not support attributes ...
    if (key.equals(ResourceData.FILENAME))
    {
      return LoaderUtils.getFileName(this.resourcePath);
    }
    return null;
  }

  public long getVersion(ResourceManager caller)
          throws ResourceLoadingException
  {
    // We assume, that the data does never change
    // This way, we get the benefit of the cache.
    return 0;
  }

  public ResourceKey getKey()
  {
    return key;
  }
}

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