/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package java.nio;
import gnu.classpath.Pointer;
import org.jnode.system.resource.MemoryResource;
import org.jnode.system.resource.ResourceManager;
import org.jnode.system.resource.ResourceNotFreeException;
import org.jnode.system.resource.ResourceOwner;
import org.jnode.system.resource.SimpleResourceOwner;
import org.jnode.naming.InitialNaming;
import org.vmmagic.unboxed.Address;
import javax.naming.NameNotFoundException;
/**
*
*/
public class MemoryRawData extends Pointer {
final MemoryResource resource;
final Address address;
MemoryRawData(int size) {
try {
final ResourceManager rm = InitialNaming.lookup(ResourceManager.NAME);
final ResourceOwner owner = new SimpleResourceOwner("java.nio");
this.resource = rm.claimMemoryResource(owner, null, size,
ResourceManager.MEMMODE_NORMAL);
this.address = resource.getAddress();
} catch (NameNotFoundException ex) {
throw new Error("Cannot find ResourceManager", ex);
} catch (ResourceNotFreeException ex) {
throw new Error("Cannot allocate direct memory", ex);
}
}
MemoryRawData(MemoryResource resource) {
this.resource = resource;
this.address = resource.getAddress();
}
/**
* Wrap a bytebuffer around the given memory resource.
*
* @param resource a memory resource to wrap
* @return the new ByteBuffer
*/
public static ByteBuffer wrap(MemoryResource resource) {
final Object owner = resource.getOwner();
final Pointer address = new MemoryRawData(resource);
final int size = resource.getSize().toInt();
final ByteBuffer result = new DirectByteBufferImpl.ReadWrite(owner, address, size, size, 0);
result.mark();
return result;
}
}