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package gnu.java.nio;
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
/** This file is not user visible !
* But alas, Java does not have a concept of frieldly packages
* so this class is public.
* Instances of this class are created by invoking getChannel
* Upon a Input/Output/RandomAccessFile object.
*/
public class FileChannelImpl extends FileChannel
{
public long address;
public int length;
public int fd;
public MappedByteBuffer buf;
public Object file_obj; // just to keep it live...
/**
* This method came from java.io.RandomAccessFile
* It is private there so we will repeat it here.
*/
private native long lengthInternal(int native_fd) throws IOException;
public FileChannelImpl(int fd,
Object obj)
{
this.fd = fd;
this.file_obj = obj;
// System.out.println("file channel: " + fd);
}
public long size() throws IOException
{
return lengthInternal(fd);
}
public boolean isOpen()
{
// FIXME
return fd != 0;
}
protected void implCloseChannel() throws IOException
{
//System.out.println("length in Java ="+length);
if (address != 0)
{
nio_unmmap_file(fd,
address,
(int)length);
}
// FIXME
fd = 0;
if (file_obj instanceof RandomAccessFile)
{
RandomAccessFile o = (RandomAccessFile) file_obj;
o.close();
//System.out.println("closing stream too");
}
else if (file_obj instanceof FileInputStream)
{
FileInputStream o = (FileInputStream) file_obj;
o.close();
}
else if (file_obj instanceof FileOutputStream)
{
FileOutputStream o = (FileOutputStream) file_obj;
o.close();
}
}
public int read(java.nio.ByteBuffer dst) throws IOException
{
//System.out.println("unimplemented: in here-1");
int w = 0;
int s = (int)size();
if (buf == null)
{
throw new EOFException("file not mapped");
}
for (int i=0; i<s; i++)
{
dst.put( buf.get() );
}
return s;
}
public int write(java.nio.ByteBuffer src) throws IOException
{
int w = 0;
if (buf == null)
{
throw new EOFException("file not mapped");
}
while (src.hasRemaining())
{
buf.put(src.get());
w++;
}
return w;
}
public long write(java.nio.ByteBuffer[] srcs,
int offset,
int length) throws IOException
{
long res = 0;
for (int i=offset;i<offset+length;i++)
{
res += write(srcs[i]);
}
return res;
}
public MappedByteBuffer map(java.nio.channels.FileChannel.MapMode mode,
long position,
int size) throws IOException
{
int cmode = mode.m;
address = nio_mmap_file(fd, position, size, cmode);
length = size;
// System.out.println("file mapped" + address + "length="+length);
buf = new MappedByteFileBuffer(this);
return buf;
}
static MappedByteBuffer create_direct_mapped_buffer(long address,
long length)
{
FileChannelImpl ch = new FileChannelImpl(-1, null);
ch.address = address;
ch.length = (int)length;
ch.buf = new MappedByteFileBuffer(ch);
return ch.buf;
}
/* msync with the disk */
public void force(boolean metaData)
{
nio_msync(fd, address, length);
}
static native long nio_mmap_file(int fd,
long pos,
int size,
int mode);
static native void nio_unmmap_file(int fd,
long address,
int size);
static native void nio_msync(int fd,
long address,
int length);
}
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