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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.file;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
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;
import org.pentaho.reporting.libraries.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;
private static final long serialVersionUID = -5719048997437795736L;
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
{
if (caller == null)
{
throw new NullPointerException();
}
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 == null)
{
throw new NullPointerException();
}
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
{
if (caller == null)
{
throw new NullPointerException();
}
return file.lastModified();
}
public ResourceKey getKey()
{
return key;
}
}
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