/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.container.configuration;
import org.exoplatform.commons.utils.IOUtil;
import org.exoplatform.commons.utils.SecurityHelper;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.PrivilegedAction;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
class EntityResolverImpl implements EntityResolver
{
/** . */
private final Map<String, String> systemIdToResourcePath;
/** . */
private final ConcurrentMap<String, byte[]> systemIdToSource;
/** . */
private final ClassLoader loader;
public EntityResolverImpl(ClassLoader loader, Map<String, String> systemIdToResourcePath)
{
// Defensive copy
this.systemIdToResourcePath = new HashMap<String, String>(systemIdToResourcePath);
this.systemIdToSource = new ConcurrentHashMap<String, byte[]>();
this.loader = loader;
}
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException
{
if (systemId != null)
{
byte[] data = systemIdToSource.get(systemId);
//
if (data == null)
{
final String path = systemIdToResourcePath.get(systemId);
if (path != null)
{
InputStream in = SecurityHelper.doPrivilegedAction(new PrivilegedAction<InputStream>()
{
public InputStream run()
{
return loader.getResourceAsStream(path);
}
});
if (in != null)
{
data = IOUtil.getStreamContentAsBytes(in);
}
}
// Black list it, we won't find it
if (data == null)
{
data = new byte[0];
}
// Put in cache
systemIdToSource.put(systemId, data);
// Some basic prevention against stupid use of this class that could cause OOME
if (systemIdToSource.size() > 1000)
{
systemIdToSource.clear();
}
}
//
if (data != null && data.length > 0)
{
return new InputSource(new ByteArrayInputStream(data));
}
}
//
return null;
}
}