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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.resourceloader.loader;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import org.pentaho.reporting.libraries.base.util.IOUtils;
import org.pentaho.reporting.libraries.resourceloader.ResourceData;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import org.pentaho.reporting.libraries.resourceloader.ResourceLoadingException;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;
/**
* A generic read handler for URL resources.
*
* @author Thomas Morgner
*/
public class URLResourceData extends AbstractResourceData
{
private long lastDateMetaDataRead;
private long modificationDate;
private String filename;
private Long contentLength;
private String contentType;
private boolean metaDataOK;
private URL url;
private ResourceKey key;
private static final long serialVersionUID = -7183025686032509509L;
public URLResourceData(final ResourceKey key)
{
if (key == null)
{
throw new NullPointerException();
}
this.modificationDate = -1;
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);
}
protected URLResourceData()
{
}
protected void setUrl(final URL url)
{
this.url = url;
}
protected void setKey(final ResourceKey key)
{
this.key = key;
}
protected void setFilename(final String filename)
{
this.filename = filename;
}
protected URL getUrl()
{
return url;
}
protected String getFilename()
{
return filename;
}
private void readMetaData() throws IOException
{
if (metaDataOK && (System.currentTimeMillis() - lastDateMetaDataRead) < 5000)
{
return;
}
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;
lastDateMetaDataRead = System.currentTimeMillis();
}
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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