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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: AbstractFactoryModule.java 3325 2007-09-12 23:57:55Z tmorgner $
* ------------
* (C) Copyright 2006, by Pentaho Corporation.
*/
package org.jfree.resourceloader.factory;
import java.io.IOException;
import java.io.InputStream;
import org.jfree.resourceloader.ResourceData;
import org.jfree.resourceloader.ResourceLoadingException;
import org.jfree.resourceloader.ResourceCreationException;
import org.jfree.resourceloader.ResourceManager;
/**
* Creation-Date: 05.04.2006, 17:44:42
*
* @author Thomas Morgner
*/
public abstract class AbstractFactoryModule implements FactoryModule
{
protected AbstractFactoryModule()
{
}
protected abstract int[] getFingerPrint();
protected abstract String[] getMimeTypes();
protected abstract String[] getFileExtensions();
public int canHandleResource(final ResourceManager caller,
final ResourceData data)
throws ResourceCreationException, ResourceLoadingException
{
try
{
final InputStream asStream = data.getResourceAsStream(caller);
try
{
if (canHandleResourceByContent(asStream))
{
return RECOGNIZED_FINGERPRINT;
}
final String mimeType = (String)
data.getAttribute(ResourceData.CONTENT_TYPE);
if (mimeType != null && canHandleResourceByMimeType(mimeType))
{
return RECOGNIZED_CONTENTTYPE;
}
final String fileName = (String)
data.getAttribute(ResourceData.FILENAME);
if (fileName != null && canHandleResourceByName(fileName))
{
return RECOGNIZED_CONTENTTYPE;
}
return REJECTED;
}
finally
{
asStream.close();
}
}
catch (ResourceLoadingException e)
{
throw e;
}
catch (Exception e)
{
throw new ResourceCreationException("Failed to load or check content", e);
}
}
protected boolean canHandleResourceByContent(final InputStream data)
throws IOException
{
final int[] fingerprint = getFingerPrint();
if (fingerprint.length == 0)
{
return false;
}
for (int i = 0; i < fingerprint.length; i++)
{
if (fingerprint[i] != data.read())
{
return false;
}
}
return true;
}
protected boolean canHandleResourceByMimeType(final String name)
{
final String[] mimes = getMimeTypes();
for (int i = 0; i < mimes.length; i++)
{
if (name.equals(mimes[i]))
{
return true;
}
}
return false;
}
protected boolean canHandleResourceByName(final String name)
{
final String[] fexts = getFileExtensions();
for (int i = 0; i < fexts.length; i++)
{
if (name.equalsIgnoreCase(fexts[i]))
{
return true;
}
}
return false;
}
}
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