/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See endLog of file]
 */

package riot.comms;

import java.io.IOException ;
import java.io.InputStream ;
import java.io.OutputStream ;
import java.net.Socket ;
import java.nio.ByteBuffer ;
import java.nio.channels.SocketChannel ;

import org.openjena.atlas.io.BufferingWriter ;
import org.openjena.atlas.lib.Sink ;
import org.openjena.riot.tokens.Tokenizer ;
import org.openjena.riot.tokens.TokenizerFactory ;
import riot.comms.client.DirectChannel ;
import riot.io.TokenInputStream ;
import riot.io.TokenInputStreamBase ;
import riot.io.TokenOutputStream ;
import riot.io.TokenOutputStreamWriter ;

/** A two-way flow of tuples */
public class TokenStreamEndpoint
{
    /** Actively create */
    public static TokenStreamEndpoint create(String hostname, int port)
    {
        DirectChannel directChannel = new DirectChannel(hostname, port) ;
        String label = hostname+":"+port ;
        return create(label,label, directChannel.getSocket()) ;
    }
    
    /** Passively create */
    public static TokenStreamEndpoint create(SocketChannel channel)
    { 
        Socket socket = channel.socket() ;
        try
        {
            InputStream input = socket.getInputStream() ;
            OutputStream output = socket.getOutputStream() ;
            return new TokenStreamEndpoint("input", "output", socket, input, output) ;
        } catch (IOException ex)
        {
            throw new CommsException(ex) ; 
        }
    }
    
    public static TokenStreamEndpoint create(String labelInput, String labelOutput,
                                             InputStream input, OutputStream output) 
    { 
        return new TokenStreamEndpoint(labelInput, labelOutput, null, input, output) ;
    }

    public static TokenStreamEndpoint create(String labelInput, String labelOutput,
                                             Socket socket) 
    { 
        try
        {
            return new TokenStreamEndpoint(labelInput, labelOutput, socket, socket.getInputStream(), socket.getOutputStream()) ;
        } catch (IOException ex)
        {
            throw new CommsException(ex) ;
        }
    }

    
    private TokenInputStream tokenInput ;
    private TokenOutputStream tokenOutput ;
    private String labelInput ;
    private String labelOutput ;
    private Socket socket ;
    
    private TokenStreamEndpoint(String labelInput, String labelOutput, Socket socket, InputStream input, OutputStream output)
    {
        this.socket = socket ;

        this.labelInput = labelInput ;
        this.labelOutput = labelOutput ;
        
        // Build all the stack of classes so that a raw byte stream is treated as a tuple stream.
        Tokenizer stream = TokenizerFactory.makeTokenizerUTF8(input) ;
        this.tokenInput = new TokenInputStreamBase(labelInput, stream) ;

        // Output.
        Sink<ByteBuffer> dest = new BufferingWriter.SinkOutputStream(output) ; 
        BufferingWriter bw = new BufferingWriter(dest) ;
        this.tokenOutput = new TokenOutputStreamWriter(labelOutput, bw) ;
    }
    
    @Override
    public String toString()
    {
        return labelInput+" -> "+labelOutput ;
    }
    
    
    public boolean endOfInput() 
    {
        return ! tokenInput.hasNext() ; 
    }
    
    public TokenInputStream getInput()
    {
        return tokenInput ; 
    }

    public TokenOutputStream getOutput()
    {
        return tokenOutput ;
    }
    
    public void close()
    {
        try
        {
            tokenInput.close() ;
            if ( socket != null )
                socket.close() ;
            tokenOutput.close() ;
        } catch (Exception ex)
        {}
    }

}

/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */