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// ========================================================================
// $Id: IO.java,v 1.13 2005/08/13 00:01:28 gregwilkins Exp $
// Copyright 1996-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================

package org.browsermob.proxy.jetty.util;

import org.apache.commons.logging.Log;
import org.browsermob.proxy.jetty.log.LogFactory;

import java.io.*;

/* ======================================================================== */
/** IO Utilities.
 * Provides stream handling utilities in
 * singleton Threadpool implementation accessed by static members.
 */
public class IO extends ThreadPool
{
    private static Log log = LogFactory.getLog(IO.class);

    /* ------------------------------------------------------------------- */
    public final static String
        CRLF      = "\015\012";

    /* ------------------------------------------------------------------- */
    public final static byte[]
        CRLF_BYTES    = {(byte)'\015',(byte)'\012'};

    /* ------------------------------------------------------------------- */
    public static int bufferSize = Integer.getInteger("org.browsermob.proxy.jetty.util.IO.bufferSize", 8192).intValue();
    
    /* ------------------------------------------------------------------- */
    private static class Singleton {
        static final IO __instance=new IO();
        static
        {
            try{__instance.start();}
            catch(Exception e){log.fatal(e); System.exit(1);}
        }
    }
    
    public static IO instance()
    {
        return Singleton.__instance;
    }
    
    /* ------------------------------------------------------------------- */
    static class Job
    {
        InputStream in;
        OutputStream out;
        Reader read;
        Writer write;

        Job(InputStream in,OutputStream out)
        {
            this.in=in;
            this.out=out;
            this.read=null;
            this.write=null;
        }
        Job(Reader read,Writer write)
        {
            this.in=null;
            this.out=null;
            this.read=read;
            this.write=write;
        }
    }
    
    /* ------------------------------------------------------------------- */
    /** Copy Stream in to Stream out until EOF or exception.
     * in own thread
     */
    public static void copyThread(InputStream in, OutputStream out)
    {
        try{
            instance().run(new Job(in,out));
        }
        catch(InterruptedException e)
        {
            log.warn(LogSupport.EXCEPTION,e);
        }
    }
    
    /* ------------------------------------------------------------------- */
    /** Copy Stream in to Stream out until EOF or exception.
     */
    public static void copy(InputStream in, OutputStream out)
         throws IOException
    {
        copy(in,out,-1);
    }
    
    /* ------------------------------------------------------------------- */
    /** Copy Stream in to Stream out until EOF or exception
     * in own thread
     */
    public static void copyThread(Reader in, Writer out)
    {
        try
        {
            instance().run(new Job(in,out));
        }
        catch(InterruptedException e)
        {
            log.warn(LogSupport.EXCEPTION,e);
        }
    }
    
    /* ------------------------------------------------------------------- */
    /** Copy Reader to Writer out until EOF or exception.
     * @return TODO
     */
    public static void copy(Reader in, Writer out)
         throws IOException
    {
        copy(in,out,-1);
    }
    
    /* ------------------------------------------------------------------- */
    /** Copy Stream in to Stream for byteCount bytes or until EOF or exception.
     * @return Copied bytes count or -1 if no bytes were read *and* EOF was reached
     */
    public static void copy(InputStream in,
                            OutputStream out,
                            long byteCount)
         throws IOException
    {     
        byte buffer[] = new byte[bufferSize];
        int len=bufferSize;
        
        if (byteCount>=0)
        {
            while (byteCount>0)
            {
                if (byteCount=0)
        {
            while (byteCount>0)
            {
                if (byteCount