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/**
* ================================================
* 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: URLResourceData.java 3520 2007-10-16 10:34:47Z tmorgner $
* ------------
* (C) Copyright 2006, by Pentaho Corporation.
*/
package org.jfree.resourceloader.loader;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import org.jfree.io.IOUtils;
import org.jfree.resourceloader.ResourceData;
import org.jfree.resourceloader.ResourceKey;
import org.jfree.resourceloader.ResourceLoadingException;
import org.jfree.resourceloader.ResourceManager;
/**
* A generic read handler for URL resources.
*
* @author Thomas Morgner
*/
public class URLResourceData extends AbstractResourceData
{
private long modificationDate;
private String filename;
private Long contentLength;
private String contentType;
private boolean metaDataOK;
private URL url;
private ResourceKey key;
public URLResourceData(final ResourceKey key)
{
if (key == null)
{
throw new NullPointerException();
}
this.key = key;
this.url = (URL) key.getIdentifier();
// for the ease of implementation, we take the file name from the URL.
// Feel free to add a 'Content-Disposition' parser with all details :)
this.filename = IOUtils.getInstance().getFileName(url);
}
private void readMetaData() throws IOException
{
final URLConnection c = url.openConnection();
c.setDoOutput(false);
c.setAllowUserInteraction(false);
if (c instanceof HttpURLConnection)
{
final HttpURLConnection httpURLConnection = (HttpURLConnection) c;
httpURLConnection.setRequestMethod("HEAD");
}
c.connect();
modificationDate = c.getDate();
contentLength = new Long(c.getContentLength());
contentType = c.getHeaderField("content-type");
c.getInputStream().close();
metaDataOK = true;
}
public InputStream getResourceAsStream(final ResourceManager caller) throws ResourceLoadingException
{
try
{
final URLConnection c = url.openConnection();
c.setDoOutput(false);
c.setAllowUserInteraction(false);
return c.getInputStream();
}
catch (IOException e)
{
throw new ResourceLoadingException("Failed to open URL connection", e);
}
}
public Object getAttribute(final String key)
{
if (key.equals(ResourceData.FILENAME))
{
return filename;
}
if (key.equals(ResourceData.CONTENT_LENGTH))
{
try
{
if (metaDataOK == false)
{
readMetaData();
}
return contentLength;
}
catch (IOException e)
{
return null;
}
}
if (key.equals(ResourceData.CONTENT_TYPE))
{
try
{
if (metaDataOK == false)
{
readMetaData();
}
return contentType;
}
catch (IOException e)
{
return null;
}
}
return null;
}
public long getVersion(final ResourceManager caller)
throws ResourceLoadingException
{
try
{
// always read the new date .. sorry, this is expensive, but needed here
// else the cache would not be in sync ...
readMetaData();
return modificationDate;
}
catch (IOException e)
{
return -1;
}
}
public ResourceKey getKey()
{
return key;
}
}
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