NRTFile.java

/*
 *  NRTFile.java
 *  Eisenkraut
 *
 *  Copyright (c) 2004-2016 Hanns Holger Rutz. All rights reserved.
 *
 *  This software is published under the GNU General Public License v3+
 *
 *
 *	For further information, please contact Hanns Holger Rutz at
 *	contact@sciss.de
 */

package de.sciss.eisenkraut.net;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import de.sciss.net.OSCBundle;
import de.sciss.net.OSCChannel;
import de.sciss.net.OSCMessage;
import de.sciss.net.OSCPacket;

public class NRTFile {
	private final RandomAccessFile	raf;
	private final FileChannel		fch;
	private double					time;
//	private final List				pending	= new ArrayList();
	private final ByteBuffer		b;
	private OSCBundle				pending	= null;

	private NRTFile( File f, String mode )
	throws IOException
	{
		raf		= new RandomAccessFile( f, mode );
		fch		= raf.getChannel();
		b		= ByteBuffer.allocate( OSCChannel.DEFAULTBUFSIZE );
		time	= 0.0;
		pending	= new OSCBundle( time );
	}
	
	public static NRTFile openAsWrite( File f )
	throws IOException
	{
		return new NRTFile( f, "rw" );
	}
	
	public void close()
	throws IOException
	{
		if( pending.getPacketCount() == 0 ) {
			pending.addPacket( new OSCMessage( "/status" ));	// properly mark ending of rendering
		}
		flush();
//		fch.close();
		raf.close();
	}
	
	public void dispose()
	{
		try {
//			fch.close();
			raf.close();
		}
		catch( IOException e1 ) { /* ignore */ }
	}
	
	public void write( OSCPacket p )
	throws IOException
	{
		if( p instanceof OSCBundle ) {
			final OSCBundle bndl = (OSCBundle) p;
			if( bndl.getTimeTag() != pending.getTimeTag() ) {
				throw new IllegalArgumentException( "Bundles must have timetag corresponding to current time" );
			}
			flush();
			flush( bndl );
		} else if( p instanceof OSCMessage ) {
			pending.addPacket( p );
		} else {
			throw new IllegalArgumentException( p.getClass().getName() );
		}
	}
	
	public void flush()
	throws IOException
	{
		if( pending.getPacketCount() == 0 ) return;
	
		flush( pending );
	}
	
	private void flush( OSCBundle bndl )
	throws IOException
	{
		final int pos2;
	
		b.clear();
		b.putInt( 0 );			// calculate size later
		bndl.encode( b );
		pos2 = b.position();
		b.position( 0 );
		b.putInt( pos2 - 4 ).position( pos2 );
		b.flip();
		fch.write( b );
	}
	
	public void addTime( double seconds )
	throws IOException
	{
		if( seconds < 0.0 ) throw new IllegalArgumentException( "Cannot step back in time" );
		flush();
		time   += seconds;
		pending	= new OSCBundle( time );
	}

	public void setTime( double seconds )
	throws IOException
	{
		if( time > seconds ) throw new IllegalArgumentException( "Cannot step back in time" );
		flush();
		time	= seconds;
		pending	= new OSCBundle( time );
	}
	
	public double getTime()
	{
		return time;
	}
}