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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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package com.sun.grizzly.util;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLEngineResult.HandshakeStatus;

/**
 * SSL over NIO utility to encrypt {@link ByteBuffer} and flush them.
 * All the SSLEngine operations are delegated to class {@link SSLUtils}
 *
 * @author Jeanfrancois Arcand
 */
public final class SSLOutputWriter{

    /**
     * Encrypt the response and flush it using {@link OutputWriter}
     * @param channel  {@link SelectableChannel} to flush
     * @param bb  {@link ByteBuffer}
     * @return  number of bytes written
     * @throws java.io.IOException 
     */     
    public static long flushChannel(SelectableChannel channel, ByteBuffer bb)
            throws IOException{
      
        WorkerThread workerThread = (WorkerThread)Thread.currentThread();
        SSLEngine sslEngine = workerThread.getSSLEngine();
        ByteBuffer outputBB = workerThread.getOutputBB();
        return flushChannel(channel,bb,outputBB,sslEngine);
    }
    
    
    /**
     * Encrypt the response and flush it using {@link OutputWriter}
     * @param channel  {@link SelectableChannel} to flush 
     * @param bb  input {@link ByteBuffer}
     * @param outputBB  output {@link ByteBuffer}
     * @param sslEngine {@link SSLEngine}
     * @return  number of bytes written
     * @throws java.io.IOException 
     */     
    public static long flushChannel(SelectableChannel channel, ByteBuffer bb,
            ByteBuffer outputBB, SSLEngine sslEngine) throws IOException{  

        long nWrite = 0;
        while (bb.hasRemaining()) {
            SSLEngineResult result = SSLUtils.wrap(bb,outputBB,sslEngine);
            switch (result.getStatus()) {
                case OK:
                    if (result.getHandshakeStatus() == HandshakeStatus.NEED_TASK) {
                        SSLUtils.executeDelegatedTask(sslEngine);
                    }
                    break;

                default:
                    throw new IOException("SSLOutputWriter: " + result.getStatus());
            }

            if (outputBB.hasRemaining()) {
                nWrite += OutputWriter.flushChannel(channel,outputBB);
            }
        }
        outputBB.clear();
        return nWrite;
    }
}