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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: FileResourceData.java 3520 2007-10-16 10:34:47Z tmorgner $
* ------------
* (C) Copyright 2006, by Pentaho Corporation.
*/
package org.jfree.resourceloader.loader.file;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
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;
/**
* A simple file reader. This class, as all core implementation, does not hold
* any references to the data read from the file. Caching is left to the cache
* provider.
*
* @author Thomas Morgner
*/
public class FileResourceData extends AbstractResourceData
{
private ResourceKey key;
private File file;
public FileResourceData(final ResourceKey key) throws ResourceLoadingException
{
if (key == null)
{
throw new NullPointerException();
}
final File file = (File) key.getIdentifier();
if (file.isFile() == false)
{
throw new ResourceLoadingException
("File-handle given does not point to a regular file.");
}
if (file.canRead() == false)
{
throw new ResourceLoadingException
("File '" + file + "' is not readable.");
}
this.key = key;
this.file = file;
}
public InputStream getResourceAsStream(final ResourceManager caller) throws ResourceLoadingException
{
try
{
return new BufferedInputStream(new FileInputStream(file));
}
catch (FileNotFoundException e)
{
throw new ResourceLoadingException("Unable to open Stream: ", e);
}
}
public Object getAttribute(final String attrkey)
{
if (attrkey.equals(ResourceData.FILENAME))
{
return file.getName();
}
if (attrkey.equals(ResourceData.CONTENT_LENGTH))
{
return new Long(file.length());
}
return null;
}
public long getVersion(final ResourceManager caller)
throws ResourceLoadingException
{
return file.lastModified();
}
public ResourceKey getKey()
{
return key;
}
}
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