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package Torello.HTML;

import java.io.*;
import java.util.Vector;
import java.net.URL;
import Torello.HTML.HTMLPage.Parser;

import java.util.concurrent.*;
import java.util.concurrent.locks.*;

import Torello.HTML.Tools.JavaDoc.StaticFunctional;
import Torello.HTML.Tools.JavaDoc.Excuse;

/**
 * <CODE>HTML Page Parser (with Max Wait Time Feature) - Documentation.</CODE><BR /><BR />
 * <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPMWT">
 * <EMBED CLASS="external-html" DATA-FILE-ID="HTMLP">
 * @see Scrape#getHTML(BufferedReader, int, int)
 * @see Scrape#getHTML(BufferedReader, String, String)
 * @see HTMLPage
 */
@StaticFunctional(Excused="parser", Excuses=Excuse.SINGLETON)
public class HTMLPageMWT
{
    private HTMLPageMWT() { }

    /**
     * If needing to "swap a proprietary parser" comes up, this is possible.
     * It just needs to accept the same parameters as the current parser, and produce a 
     * {@code Vector<HTMLNode>.}  This is not an advised step to take, but if an alternative
     * parser has been tested and happens to be generating different results, it can be easily
     * 'swapped out' for the one used now.
     * @see HTMLPage.Parser;
     * @see HTMLPage.Parser#parse;
     */
    public static Parser parser = Torello.HTML.parse.ParserRE::parsePageTokens;

    // ***************************************************************************************************
    // These 6 functions presume that the HTML source is from a URL
    // ***************************************************************************************************
    
    /**
     * Parses and Vectorizes HTML from a URL source.
     * Spawns a <I>monitor-thread</I> that stops the download if a certain, user-specified,
     * time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param url <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPURL">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        URL url, boolean eliminateHTMLTags
    )
        throws IOException, InterruptedException
    {
        return getPageTokens(timeout, unit, url, eliminateHTMLTags, null, null, null, null, null);
    }
    
    /**
     * Parses and Vectorizes HTML from a URL source.
     * Spawns a <I>monitor-thread</I> that stops the download if a certain, user-specified,
     * time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param url <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPURL">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPET">
     * @param endTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPST">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws ScrapeException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX2">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */ 
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        URL url, boolean eliminateHTMLTags,
        String startTag, String endTag
    )
        throws IOException, InterruptedException
    {
        return getPageTokens
            (timeout, unit, url, eliminateHTMLTags, startTag, endTag, null, null, null);
    }
    
    /**
     * Parses and Vectorizes HTML from a URL source.
     * Spawns a <I>monitor-thread</I> that stops the download if a certain, user-specified,
     * time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param url <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPURL">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELN">
     * @param endLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSLN">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IllegalArgumentException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIAEX">
     * @throws ScrapeException  <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX1">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        URL url, boolean eliminateHTMLTags,
        int startLineNum, int endLineNum
    )
        throws IOException, InterruptedException
    {
        return getPageTokens
            (timeout, unit, url, eliminateHTMLTags, startLineNum, endLineNum, null, null, null);
    }

    /**
     * Parses and Vectorizes HTML from a URL source.
     * Spawns a <I>monitor-thread</I> that stops the download if a certain, user-specified,
     * time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param url <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPURL">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param rawHTMLFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRAW">
     * @param matchesFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPMATCH">
     * @param justTextFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPJTEXT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        URL url, boolean eliminateHTMLTags,
        String rawHTMLFile, String matchesFile, String justTextFile
    )
        throws IOException, InterruptedException
    {
        return getPageTokens(
            timeout, unit, url, eliminateHTMLTags, null, null,
            rawHTMLFile, matchesFile, justTextFile
        );
    }

    // ***************************************************************************************************
    // The next 6 functions that follow presume that the input is in the form of a Java.util.BufferedReader
    // ***************************************************************************************************

    /**
     * Parses and Vectorizes HTML from a {@code BufferedReader} source.
     * Spawns a <I>monitor-thread</I> that stops the download if a 
     * certain, user-specified, time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param br <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPBR">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        BufferedReader br, boolean eliminateHTMLTags
    )
        throws IOException, InterruptedException
    {
        return getPageTokens
            (timeout, unit, br, eliminateHTMLTags, null, null, null, null, null);
    }

    /**
     * Parses and Vectorizes HTML from a {@code BufferedReader} source.
     * Spawns a <I>monitor-thread</I> that stops the download if a 
     * certain, user-specified, time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param br <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPBR">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPET">
     * @param endTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPST">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws ScrapeException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX2">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */ 
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        BufferedReader br, boolean eliminateHTMLTags, String startTag, String endTag
    )
        throws IOException, InterruptedException
    {
        return getPageTokens
            (timeout, unit, br, eliminateHTMLTags, startTag, endTag, null, null, null);
    }

    /**
     * Parses and Vectorizes HTML from a {@code BufferedReader} source.
     * Spawns a <I>monitor-thread</I> that stops the download if a 
     * certain, user-specified, time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param br <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPBR">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELN">
     * @param endLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSLN">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IllegalArgumentException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIAEX">
     * @throws ScrapeException  <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX1">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        BufferedReader br, boolean eliminateHTMLTags,
        int startLineNum, int endLineNum
    )
        throws IOException, InterruptedException
    {
        return getPageTokens
            (timeout, unit, br, eliminateHTMLTags, startLineNum, endLineNum, null, null, null);
    }

    /**
     * Parses and Vectorizes HTML from a {@code BufferedReader} source.
     * Spawns a <I>monitor-thread</I> that stops the download if a 
     * certain, user-specified, time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param br <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPBR">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param rawHTMLFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRAW">
     * @param matchesFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPMATCH">
     * @param justTextFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPJTEXT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        BufferedReader br, boolean eliminateHTMLTags,
        String rawHTMLFile, String matchesFile, String justTextFile
    )
        throws IOException, InterruptedException
    { 
        return getPageTokens
            (timeout, unit, br, eliminateHTMLTags, null, null, rawHTMLFile, matchesFile, justTextFile);
    }

    // ***************************************************************************************************
    // * Receives a "pre-instantiated" BufferedReader for the HTML Source parameter
    // ***************************************************************************************************

    private static final ExecutorService    executor    = Executors.newCachedThreadPool();
    private static final Lock               lock        = new ReentrantLock();

    /**
     * If this class has been used to make "multi-threaded" calls that use a Time-Out wait-period,
     * you might see your Java-Program hang for a few seconds when you would expect it to exit back to your O.S. normally.
     *
     * <BR /><BR /><B>Max Wait Time</B> operates by building a "Timeout &amp; Monitor" thread, and therefore when a program you
     * have written yourself reaches the end of its code, <I><B>if you have performed any Internet-Downloads using
     * {@code class HTMLPageMWT}</B></I>, then your program <I>might not exit immediately,</I> but rather sit at the
     * command-prompt for anywhere between 10 and 30 seconds before this Timeout-Thread, created in class HTMLPageMWT, dies.
     *
     * <BR /><BR /><B><SPAN STYLE="color: red">MULTI-THREADED:</B></SPAN> You may immediately terminate any additional
     * threads that were started using this method.
     */
    public static void shutdownMWTThreads() { executor.shutdownNow(); }

    /**
     * Parses and Vectorizes HTML from a {@code BufferedReader} source.
     * Spawns a <I>monitor-thread</I> that stops the download if a 
     * certain, user-specified, time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param br <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPBR">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPET">
     * @param endTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPST">
     * @param rawHTMLFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRAW">
     * @param matchesFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPMATCH">
     * @param justTextFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPJTEXT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws ScrapeException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX2">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        BufferedReader br, boolean eliminateHTMLTags,
        String startTag, String endTag,
        String rawHTMLFile, String matchesFile, String justTextFile
    )
        throws IOException, InterruptedException
    {
        Callable<Vector<HTMLNode>> threadDownloader = new Callable<Vector<HTMLNode>>()
        {
            public Vector<HTMLNode> call() throws Exception
            {
                return parser.parse(
                    Scrape.getHTML(br, startTag, endTag),
                    eliminateHTMLTags, rawHTMLFile, matchesFile, justTextFile
                );
            }
        };

        lock.lock();
        Future<Vector<HTMLNode>> future = executor.submit(threadDownloader);
        lock.unlock();

        try
            { return future.get(timeout, unit); }
        catch (TimeoutException e)
            { return null; }
        catch (ExecutionException e)
        {
            Throwable originalException = e.getCause();
            if (originalException == null) throw new RejectedExecutionException(
                "An Execution Exception was thrown, but it did provide a cause throwable " +
                "(e.getCause() returned null).  See this exception's getCause() method to " +
                "view the ExecutionException that has occurred.",
                e
            );

            if (originalException instanceof IOException)
                throw (IOException) originalException;

            if (originalException instanceof RuntimeException)
                throw (RuntimeException) originalException;

            throw new RejectedExecutionException(
                "An Execution Exception occurred, but it was neither a RuntimeException, " +
                "nor IOException.  See this exception's getCause() method to view the " +
                "underlying error that has occurred.", originalException
            );
        }
    }

    /**
     * Parses and Vectorizes HTML from a {@code BufferedReader} source.
     * Spawns a <I>monitor-thread</I> that stops the download if a 
     * certain, user-specified, time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param br <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPBR">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELN">
     * @param endLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSLN">
     * @param rawHTMLFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRAW">
     * @param matchesFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPMATCH">
     * @param justTextFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPJTEXT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IllegalArgumentException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIAEX">
     * @throws ScrapeException  <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX1">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        BufferedReader br, boolean eliminateHTMLTags,
        int startLineNum, int endLineNum,
        String rawHTMLFile, String matchesFile, String justTextFile
    )
        throws IOException, InterruptedException
    {
        Callable<Vector<HTMLNode>> threadDownloader = new Callable<Vector<HTMLNode>>()
        {
            public Vector<HTMLNode> call() throws Exception
            {
                return parser.parse(
                    Scrape.getHTML(br, startLineNum, endLineNum),
                    eliminateHTMLTags, rawHTMLFile, matchesFile, justTextFile
                );
            }
        };

        lock.lock();
        Future<Vector<HTMLNode>> future = executor.submit(threadDownloader);
        lock.unlock();

        try
            { return future.get(timeout, unit); }
        catch (TimeoutException e)
            { return null; }
        catch (ExecutionException e)
        {
            Throwable originalException = e.getCause();

            if (originalException == null) throw new RejectedExecutionException(
                "An Execution Exception was thrown, but it did provide a cause throwable " +
                "(e.getCause() returned null).  See this exception's getCause() method to " +
                "view the ExecutionException has that occurred.",
                e
            );

            if (originalException instanceof IOException)
                throw (IOException) originalException;

            if (originalException instanceof RuntimeException)
                throw (RuntimeException) originalException;

            throw new RejectedExecutionException(
                "An Execution Exception occurred, but it was neither a RuntimeException, nor " +
                "IOException.  See this exception's getCause() method to view the underlying " +
                "error that has occurred.", originalException
            );
        }
    }

    // ***************************************************************************************************
    // * Receives a java.net.URL for the HTML Source parameter, which could Timeout/Hang - so it must
    // * be opened within the Multi-Threaded "Timeout" code (and therefore requires a second version of
    // * these two methods - where Scrape.openConn(url) is *inside* the monitored downloading thread.
    // ***************************************************************************************************
    
    /**
     * Parses and Vectorizes HTML from a URL source.
     * Spawns a <I>monitor-thread</I> that stops the download if a certain, user-specified,
     * time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param url <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPURL">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPET">
     * @param endTag <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPST">
     * @param rawHTMLFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRAW">
     * @param matchesFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPMATCH">
     * @param justTextFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPJTEXT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws ScrapeException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX2">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        URL url, boolean eliminateHTMLTags,
        String startTag, String endTag,
        String rawHTMLFile, String matchesFile, String justTextFile
    )
        throws IOException, InterruptedException
    {
        Callable<Vector<HTMLNode>> threadDownloader = new Callable<Vector<HTMLNode>>()
        {
            public Vector<HTMLNode> call() throws Exception
            { 
                return parser.parse(
                    Scrape.getHTML(Scrape.openConn(url), startTag, endTag),
                    eliminateHTMLTags, rawHTMLFile, matchesFile, justTextFile
                );
            }
        };

        lock.lock();
        Future<Vector<HTMLNode>> future = executor.submit(threadDownloader);
        lock.unlock();

        try
            { return future.get(timeout, unit); }
        catch (TimeoutException e)
            { return null; }
        catch (ExecutionException e)
        {
            Throwable originalException = e.getCause();

            if (originalException == null) throw new RejectedExecutionException(
                "An Execution Exception was thrown, but it did provide a cause throwable " +
                "(e.getCause() returned null).  See this exception's getCause() method to " +
                "view the ExecutionException that has occurred.", e
            );

            if (originalException instanceof IOException)
                throw (IOException) originalException;

            if (originalException instanceof RuntimeException)
                throw (RuntimeException) originalException;

            throw new RejectedExecutionException(
                "An Execution Exception occurred, but it was neither a RuntimeException, " +
                "nor IOException.  See this exception's getCause() method to view the " +
                "underlying error that has occurred.", originalException
            );
        }
    }

    
    /**
     * Parses and Vectorizes HTML from a URL source.
     * Spawns a <I>monitor-thread</I> that stops the download if a certain, user-specified,
     * time-limit is exceeded.
     * @param timeout <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPTO">
     * @param unit <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPUNIT">
     * @param url <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPURL">
     * @param eliminateHTMLTags <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELIMT">
     * @param startLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPELN">
     * @param endLineNum <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSLN">
     * @param rawHTMLFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRAW">
     * @param matchesFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPMATCH">
     * @param justTextFile <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPJTEXT">
     * @return <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPRET">
     * @throws IllegalArgumentException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIAEX">
     * @throws ScrapeException  <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPSCEX1">
     * @throws IOException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIOEX">
     * @throws InterruptedException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPIEX">
     * @throws RejectedExecutionException <EMBED CLASS="external-html" DATA-FILE-ID="HTMLPREEX">
     */
    public static Vector<HTMLNode> getPageTokens(
        long timeout, TimeUnit unit,
        URL url, boolean eliminateHTMLTags,
        int startLineNum, int endLineNum,
        String rawHTMLFile, String matchesFile, String justTextFile
    )
        throws IOException, InterruptedException
    {
        Callable<Vector<HTMLNode>> threadDownloader = new Callable<Vector<HTMLNode>>()
        {
            public Vector<HTMLNode> call() throws Exception
            { 
                return parser.parse(
                    Scrape.getHTML(Scrape.openConn(url), startLineNum, endLineNum),
                    eliminateHTMLTags, rawHTMLFile, matchesFile, justTextFile
                );
            }
        };

        lock.lock();
        Future<Vector<HTMLNode>> future = executor.submit(threadDownloader);
        lock.unlock();

        try
            { return future.get(timeout, unit); }
        catch (TimeoutException e)
            { return null; }
        catch (ExecutionException e)
        {
            Throwable originalException = e.getCause();
    
            if (originalException == null) throw new RejectedExecutionException(
                "An Execution Exception was thrown, but it did provide a cause throwable " +
                "(e.getCause() returned null).  See this exception's getCause() method to " +
                "view the ExecutionException has that occurred.",
                e
            );

            if (originalException instanceof IOException)
                throw (IOException) originalException;

            if (originalException instanceof RuntimeException)
                throw (RuntimeException) originalException;

            throw new RejectedExecutionException(
                "An Execution Exception occurred, but it was neither a RuntimeException, nor " +
                "IOException.  See this exception's getCause() method to view the underlying " +
                "error that has occurred.", originalException
            );
        }
    }
}