// plasmaParser.java 
// ------------------------
// part of YaCy
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2005
//
// last major change: 02.05.2005 by Martin Thelian
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.

// compile: javac -classpath lib/commons-collections.jar:lib/commons-pool-1.2.jar -sourcepath source source/de/anomic/plasma/plasmaParser.java


package de.anomic.plasma;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import de.anomic.htmlFilter.htmlFilterContentScraper;
import de.anomic.htmlFilter.htmlFilterOutputStream;
import de.anomic.plasma.parser.Parser;
import de.anomic.plasma.parser.ParserException;
import de.anomic.server.serverFileUtils;
import de.anomic.server.logging.serverLog;

import org.apache.commons.pool.impl.GenericKeyedObjectPool;
import org.apache.commons.pool.KeyedPoolableObjectFactory;
import org.apache.commons.pool.impl.GenericObjectPool;

public final class plasmaParser {

    /**
     * A list containing all installed parsers and the mimeType that they support
     * @see #loadAvailableParserList()
     */
    private static final Properties availableParserList = new Properties();
    
    /**
     * A list containing all enabled parsers and the mimeType that they can handle
     * @see #loadEnabledParserList()
     * @see #setEnabledParserList(Enumeration)
     */
    private static final Properties enabledParserList = new Properties();    
    
    /**
     * A list of file extensions that are supported by all enabled parsers
     */
    private static final HashSet supportedFileExt = new HashSet();
    
    /**
     * A list of file extensions that are supported by the html-parser and can
     * be parsed in realtime.
     */
    private static final HashSet supportedRealtimeFileExt = new HashSet();
    
    /**
     * A list of mimeTypes that can be parsed in Realtime (on the fly)
     */
    private static final HashSet realtimeParsableMimeTypes = new HashSet();    
    
    /**
     * A pool of parsers.
     * @see plasmaParserPool
     * @see plasmaParserFactory
     */
    private static plasmaParserPool theParserPool;

    /**
     * A list of media extensions that should <b>not</b> be handled by the plasmaParser
     */
    private static final HashSet mediaExtSet = new HashSet(28);
    
    /**
     * This {@link FilenameFilter} is used to find all classes based on there filenames 
     * which seems to be additional content parsers.
     * Currently the filenames of all content parser classes must end with <code>Parser.class</code> 
     */
    private static final FilenameFilter parserFileNameFilter = new FilenameFilter() {
        public boolean accept(File dir, String name) {
            return name.endsWith("Parser.class");
        }
    };
    
    /**
     * This {@link FileFilter} is used to get all subpackages
     * of the parser package.
     */
    private static final FileFilter parserDirectoryFilter = new FileFilter() {
        public boolean accept(File file) {
            return file.isDirectory();
        }
    };    
    
    /**
     * Initializing the 
     * @see #initMediaExt(String)
     */
    static {
        initMediaExt(extString2extList("swf,wmv,jpg,jpeg,jpe,rm,mov,mpg,mpeg,mp3,asf,gif,png,avi,zip,rar," +
        "sit,hqx,img,dmg,tar,gz,ps,xls,ppt,ram,bz2,arj"));
        
        /* ===================================================
         * initializing the parser object pool
         * =================================================== */
        GenericKeyedObjectPool.Config config = new GenericKeyedObjectPool.Config();
        
        // The maximum number of active connections that can be allocated from pool at the same time,
        // 0 for no limit
        config.maxActive = 0;
        
        // The maximum number of idle connections connections in the pool
        // 0 = no limit.        
        config.maxIdle = 10;    
        
        config.whenExhaustedAction = GenericObjectPool.WHEN_EXHAUSTED_BLOCK; 
        config.minEvictableIdleTimeMillis = 30000; 
        
        plasmaParser.theParserPool = new plasmaParserPool(new plasmaParserFactory(),config);    
        
        /* ===================================================
         * loading a list of available parsers
         * =================================================== */        
        loadAvailableParserList();      
    }
    
    /**
     * This function is used to initialize the realtimeParsableMimeTypes List.
     * This list contains a list of mimeTypes that can be parsed in realtime by
     * the yacy html-Parser
     * @param realtimeParsableMimeTypes a list of mimetypes that can be parsed by the 
     * yacy html parser
     */
    public static void initRealtimeParsableMimeTypes(String realtimeParsableMimeTypes) {
        LinkedList mimeTypes = new LinkedList();
        if ((realtimeParsableMimeTypes == null) || (realtimeParsableMimeTypes.length() == 0)) {
            
        } else {            
            String[] realtimeParsableMimeTypeList = realtimeParsableMimeTypes.split(",");        
            for (int i = 0; i < realtimeParsableMimeTypeList.length; i++) mimeTypes.add(realtimeParsableMimeTypeList[i].toLowerCase().trim());
        }
        initRealtimeParsableMimeTypes(mimeTypes);
    }
    
    /**
     * This function is used to initialize the realtimeParsableMimeTypes List.
     * This list contains a list of mimeTypes that can be parsed in realtime by
     * the yacy html-Parser
     * @param realtimeParsableMimeTypes a list of mimetypes that can be parsed by the 
     * yacy html parser
     */    
    public static void initRealtimeParsableMimeTypes(List mimeTypesList) {
        synchronized (realtimeParsableMimeTypes) {
            realtimeParsableMimeTypes.clear();
            realtimeParsableMimeTypes.addAll(mimeTypesList);
        }        
    }
    
    public static void initParseableMimeTypes(String enabledMimeTypes) {
        HashSet mimeTypes = null;
        if ((enabledMimeTypes == null) || (enabledMimeTypes.length() == 0)) {
            mimeTypes = new HashSet();
        } else {            
            String[] enabledMimeTypeList = enabledMimeTypes.split(",");
            mimeTypes = new HashSet(enabledMimeTypeList.length);
            for (int i = 0; i < enabledMimeTypeList.length; i++) mimeTypes.add(enabledMimeTypeList[i].toLowerCase().trim());
        }
        setEnabledParserList(mimeTypes);
    }
    
    public static List extString2extList(String extString) {
        LinkedList extensions = new LinkedList();
        if ((extString == null) || (extString.length() == 0)) {
            return extensions;
        } else {
            String[] xs = extString.split(",");
            for (int i = 0; i < xs.length; i++) extensions.add(xs[i].toLowerCase().trim());
        }
        return extensions;
    }
    
    public static void initMediaExt(List mediaExtList) {
        synchronized (mediaExtSet) {
            mediaExtSet.clear();
            mediaExtSet.addAll(mediaExtList);
        }
    }
    
    public static String getMediaExtList() {
        synchronized (mediaExtSet) {
            return mediaExtSet.toString();
        }        
    }
    
    public static void initSupportedRealtimeFileExt(List supportedRealtimeFileExtList) {
        synchronized (supportedRealtimeFileExt) {
            supportedRealtimeFileExt.clear();
            supportedRealtimeFileExt.addAll(supportedRealtimeFileExtList);
        }
    }
        
    public static boolean realtimeParsableMimeTypesContains(String mimeType) {
        mimeType = getRealMimeType(mimeType);
        synchronized (realtimeParsableMimeTypes) {
            return realtimeParsableMimeTypes.contains(mimeType);
        }
    }
    
    public static boolean supportedContent(URL url, String mimeType) {
        // TODO: we need some exceptions here to index URLs like this
        //       http://www.musicabona.com/respighi/12668/cd/index.html.fr
        mimeType = getRealMimeType(mimeType);
        if (mimeType.equals("text/html")) {
            return supportedMimeTypesContains(mimeType);
        } else {
            return supportedMimeTypesContains(mimeType) && supportedFileExt(url);
        }
    }
    
    public static boolean supportedRealTimeContent(URL url, String mimeType) {
        return realtimeParsableMimeTypesContains(mimeType) && supportedFileExt(url);
    }    
    
    public static boolean supportedMimeTypesContains(String mimeType) {
        mimeType = getRealMimeType(mimeType);
        
        synchronized (realtimeParsableMimeTypes) {
            if (realtimeParsableMimeTypes.contains(mimeType)) return true;
        }        
        
        synchronized (enabledParserList) { 
            return enabledParserList.containsKey(mimeType);
        }
    }
    
    public static String getFileExt(URL url) {
        // getting the file path
        String name = url.getFile();
        
        // chopping http parameters from the url
        int p = name.lastIndexOf('?');
        if (p != -1) {
            name = name.substring(0,p);
        }
        
        // tetermining last position of / in the file path
        p = name.lastIndexOf('/');
        if (p != -1) {
            name = name.substring(p);
        }
            
        // termining last position of . in file path
        p = name.lastIndexOf('.');
        if (p < 0) return name; // seams to be strange, but this is a directory entry or default file (html)
        return name.substring(p + 1);        
    }
    
    public static boolean supportedFileExt(URL url) {
        // getting the file path
        String name = getFileExt(url);
        return supportedFileExtContains(name);
    }
    
    public static boolean supportedFileExtContains(String fileExt) {
        if (supportedFileExt == null) return false;
        if (fileExt == null) return false;        
        fileExt = fileExt.trim().toLowerCase();
        
        synchronized(supportedFileExt) {
            if (supportedFileExt.contains(fileExt)) return true;
        }
        
        synchronized (supportedRealtimeFileExt) {
            return supportedRealtimeFileExt.contains(fileExt);
        }
    }
    
    public static boolean mediaExtContains(String mediaExt) {
        if (mediaExt == null) return false;
        mediaExt = mediaExt.trim().toLowerCase();
        
        synchronized (supportedFileExt) {
			if (supportedFileExt.contains(mediaExt)) return false;
		}
        
        synchronized (supportedRealtimeFileExt) {
            if (supportedRealtimeFileExt.contains(mediaExt)) return false;
        }        
        
        synchronized (mediaExtSet) {
			return mediaExtSet.contains(mediaExt);
		}
    }

    public static String getRealMimeType(String mimeType) {
        //if (mimeType == null) doMimeTypeAnalysis
        if (mimeType == null) mimeType = "application/octet-stream";
        mimeType = mimeType.trim().toLowerCase();
        
        int pos = mimeType.indexOf(';');
        return ((pos < 0) ? mimeType : mimeType.substring(0, pos));              
    }
    
    public static String getMimeTypeByFileExt(String fileExt) {
        // loading a list of extensions from file
        Properties prop = new Properties();
        BufferedInputStream bufferedIn = null;
        try {            
            prop.load(bufferedIn = new BufferedInputStream(new FileInputStream(new File("httpd.mime"))));
        } catch (IOException e) {
            System.err.println("ERROR: httpd.mime not found in settings path");
        } finally {
            if (bufferedIn != null) try{bufferedIn.close();}catch(Exception e){}
        }
        
        return prop.getProperty(fileExt,"application/octet-stream");
    }
    
    public plasmaParser() {
        // nothing todo here at the moment
    }
    
    public static String[] setEnabledParserList(Set mimeTypeSet) {
        
        Properties newEnabledParsers = new Properties();
        HashSet newSupportedFileExt = new HashSet();
        
        if (mimeTypeSet != null) {
            Iterator mimeTypes = mimeTypeSet.iterator();
            while (mimeTypes.hasNext()) {
                String mimeType = (String) mimeTypes.next();
                if (availableParserList.containsKey(mimeType)) {
                    Parser theParser = null;
                    try {
                        // getting the parser
                        theParser = (Parser) plasmaParser.theParserPool.borrowObject(availableParserList.get(mimeType));
                        
                        // getting a list of mimeTypes that the parser supports
                        Hashtable parserSupportsMimeTypes = theParser.getSupportedMimeTypes();
                        if (parserSupportsMimeTypes != null) {
                            Object supportedExtensions = parserSupportsMimeTypes.get(mimeType);
                            if ((supportedExtensions != null) &&
                                    (supportedExtensions instanceof String) &&
                                    (((String)supportedExtensions).length() > 0)) {
                                String[] extArray = ((String)supportedExtensions).split(",");
                                newSupportedFileExt.addAll(Arrays.asList(extArray));
                            }
                        }
                        newEnabledParsers.put(mimeType,availableParserList.get(mimeType));
                        
                    } catch (Exception e) {
                        serverLog.logSevere("PARSER", "error in setEnabledParserList", e);
                    } finally {
                        if (theParser != null)
                            try { plasmaParser.theParserPool.returnObject(mimeType,theParser); } catch (Exception e) {}
                    }
                }
            }
        }
        
        synchronized (enabledParserList) {
            enabledParserList.clear();
            enabledParserList.putAll(newEnabledParsers);
        }
        
        
        synchronized (supportedFileExt) {
            supportedFileExt.clear();
            supportedFileExt.addAll(newSupportedFileExt);
        }

        return (String[])newEnabledParsers.keySet().toArray(new String[newEnabledParsers.size()]);
    }
    
    public Hashtable getEnabledParserList() {
        synchronized (plasmaParser.enabledParserList) {
            return (Hashtable) plasmaParser.enabledParserList.clone();
		}        
    }
    
    public Hashtable getAvailableParserList() {
        return plasmaParser.availableParserList;
    }
    
    private static void loadEnabledParserList() {
        // loading a list of availabe parser from file
        Properties prop = new Properties();
        BufferedInputStream bufferedIn = null;
        try {
            prop.load(bufferedIn = new BufferedInputStream(new FileInputStream(new File("yacy.parser"))));
        } catch (IOException e) {
            System.err.println("ERROR: yacy.parser not found in settings path");
        } finally {
            if (bufferedIn != null) try{ bufferedIn.close(); }catch(Exception e){}
        }
        
        // enable them ...
        setEnabledParserList(prop.keySet());
    }
    
    private static void loadAvailableParserList() {
        try {
            plasmaParser.availableParserList.clear();
            
            // getting the current java classpath
            String javaClassPath = System.getProperty("java.class.path");
            
            // getting the current package name
            String plasmaParserPkgName = plasmaParser.class.getPackage().getName() + ".parser";
            serverLog.logInfo("PARSER","Searching for additional content parsers in package " + plasmaParserPkgName);
            
            // getting an uri to the parser subpackage
            String packageURI = plasmaParser.class.getResource("/"+plasmaParserPkgName.replace('.','/')).toString();
            serverLog.logFine("PARSER", "Parser directory is " + packageURI);
            
            // open the parser directory
            File parserDir = new File(new URI(packageURI));
            if ((parserDir == null) || (!parserDir.exists()) || (!parserDir.isDirectory())) return;
            
            /*
             * loop through all subdirectories and test if we can
             * find an additional parser class
             */
            File[] parserDirectories = parserDir.listFiles(parserDirectoryFilter);
            if (parserDirectories == null) return;
            for (int parserDirNr=0; parserDirNr< parserDirectories.length; parserDirNr++) {
                File currentDir = parserDirectories[parserDirNr];
                serverLog.logFine("PARSER", "Searching in directory " + currentDir.toString());
                String[] parserClasses = currentDir.list(parserFileNameFilter);
                if (parserClasses == null) continue;
                
                for (int parserNr=0; parserNr<parserClasses.length; parserNr++) {
                    serverLog.logFine("PARSER", "Testing parser class " + parserClasses[parserNr]);
                    String className = parserClasses[parserNr].substring(0,parserClasses[parserNr].indexOf(".class"));
                    String fullClassName = plasmaParserPkgName + "." + currentDir.getName() + "." + className;
                    try {
                        // trying to load the parser class by its name
                        Class parserClass = Class.forName(fullClassName);
                        Object theParser = parserClass.newInstance();
                        if (!(theParser instanceof Parser)) continue;
                        
                        // testing if all needed libx libraries are available
                        String[] neededLibx = ((Parser)theParser).getLibxDependences();
                        StringBuffer neededLibxBuf = new StringBuffer();
                        if (neededLibx != null) {
                            for (int libxId=0; libxId < neededLibx.length; libxId++) {
                                if (javaClassPath.indexOf(neededLibx[libxId]) == -1) {
                                    throw new ParserException("Missing dependency detected: '" + neededLibx[libxId] + "'.");
                                }
                                neededLibxBuf.append(neededLibx[libxId])
                                             .append(",");
                            }
                            if (neededLibxBuf.length()>0) neededLibxBuf.deleteCharAt(neededLibxBuf.length()-1);
                        }
                        
                        // loading the list of mime-types that are supported by this parser class
                        Hashtable supportedMimeTypes = ((Parser)theParser).getSupportedMimeTypes();
                        Iterator mimeTypeIterator = supportedMimeTypes.keySet().iterator();
                        while (mimeTypeIterator.hasNext()) {
                            String mimeType = (String) mimeTypeIterator.next();
                            availableParserList.put(mimeType,fullClassName);
                            serverLog.logInfo("PARSER", "Found functional parser for mimeType '" + mimeType + "'." +
                                              ((neededLibxBuf.length()>0)?"\n   Dependencies: " + neededLibxBuf.toString():""));
                        }
                        
                    } catch (Exception e) { /* we can ignore this for the moment */
                        serverLog.logWarning("PARSER", "Parser '" + className + "' doesn't work correctly and will be ignored.\n [" + e.getClass().getName() + "]: " + e.getMessage());
                    } catch (Error e) { /* we can ignore this for the moment */
                        serverLog.logWarning("PARSER", "Parser '" + className + "' doesn't work correctly and will be ignored.\n [" + e.getClass().getName() + "]: " + e.getMessage());
                    }
                }
            }
            
        } catch (Exception e) {
            serverLog.logSevere("PARSER", "Unable to determine all installed parsers. " + e.getMessage());
        }
    }
    
    public void close() {
        // clearing the parser list
        synchronized (enabledParserList) {
            enabledParserList.clear();
        }
        
        // closing the parser object pool
        try {
            theParserPool.close();
        } catch (Exception e) { }
    }
    
    public plasmaParserDocument parseSource(URL location, String mimeType, byte[] source) {
        
        Parser theParser = null;
        try {
            mimeType = getRealMimeType(mimeType);
            String fileExt = getFileExt(location);
            
            // TODO: Handling of not trustable mimeTypes
            // text/plain, octet-stream
            if (
                    (mimeType.equalsIgnoreCase("text/plain") && !fileExt.equalsIgnoreCase("txt")) || 
                    (mimeType.equalsIgnoreCase("text/xml")   && !fileExt.equalsIgnoreCase("txt"))
            ) {
                if (enabledParserList.containsKey("application/octet-stream")) {
                    mimeType = "application/octet-stream";
                }
            }
            
            // getting the correct parser for the given mimeType
            theParser = this.getParser(mimeType);            
            
            // if a parser was found we use it ...
            if (theParser != null) {
                return theParser.parse(location, mimeType,source);
            } else if (realtimeParsableMimeTypesContains(mimeType)) {        
                // ... otherwise we make a html scraper and transformer
                htmlFilterContentScraper scraper = new htmlFilterContentScraper(location);
                OutputStream hfos = new htmlFilterOutputStream(null, scraper, null, false);
                hfos.write(source);
                hfos.close();
                return transformScraper(location, mimeType, scraper);
            } else {
                return null;
            }
        } catch (Exception e) {
            //e.printStackTrace();
            return null;
        } finally {
            if ((theParser != null) && (supportedMimeTypesContains(mimeType))) {
                try { plasmaParser.theParserPool.returnObject(mimeType, theParser); } catch (Exception e) {}
            }
        }
    }

    public plasmaParserDocument parseSource(URL location, String mimeType, File sourceFile) {

        Parser theParser = null;
        try {
            mimeType = getRealMimeType(mimeType);
            String fileExt = getFileExt(location);
            
            // TODO: Handling of not trustable mimeTypes
            // text/plain, octet-stream
            if (
                    (mimeType.equalsIgnoreCase("text/plain") && !fileExt.equalsIgnoreCase("txt")) || 
                    (mimeType.equalsIgnoreCase("text/xml")   && !fileExt.equalsIgnoreCase("txt"))
            ) {
                if (enabledParserList.containsKey("application/octet-stream")) {
                    mimeType = "application/octet-stream";
                }
            }          
            
            // getting the correct parser for the given mimeType
            theParser = this.getParser(mimeType);
            
            // if a parser was found we use it ...
            if (theParser != null) {
                return theParser.parse(location, mimeType,sourceFile);
            } else if (realtimeParsableMimeTypesContains(mimeType)) {                      
                // ...otherwise we make a scraper and transformer
                htmlFilterContentScraper scraper = new htmlFilterContentScraper(location);
                OutputStream hfos = new htmlFilterOutputStream(null, scraper, null, false);            
                serverFileUtils.copy(sourceFile, hfos);
                hfos.close();
                return transformScraper(location, mimeType, scraper);
            } else {
                return null;
            }
        } catch (Exception e) {
            //e.printStackTrace();
            return null;
        } finally {
            if ((theParser != null) && (supportedMimeTypesContains(mimeType))) {
                try { plasmaParser.theParserPool.returnObject(mimeType, theParser); } catch (Exception e) { }
            }
        }
    }
    
    public plasmaParserDocument transformScraper(URL location, String mimeType, htmlFilterContentScraper scraper) {
        try {
            plasmaParserDocument ppd =  new plasmaParserDocument(new URL(htmlFilterContentScraper.urlNormalform(location)),
                                mimeType, null, null, scraper.getHeadline(),
                                null, null,
                                scraper.getText(), scraper.getAnchors(), scraper.getImages());
            //scraper.close();
            return ppd;
        } catch (MalformedURLException e) {
            //e.printStackTrace();
            return null;
        }
    }
    
    /**
     * This function is used to determine the parser class that should be used for a given
     * mimetype ...
     * @param mimeType
     * @return
     */
    public Parser getParser(String mimeType) {

        mimeType = getRealMimeType(mimeType);        
        try {
            
            // determining the proper parser class name for the mimeType
            String parserClassName = null;
            synchronized (plasmaParser.enabledParserList) {
    	        if (plasmaParser.enabledParserList.containsKey(mimeType)) {
    	            parserClassName = (String)plasmaParser.enabledParserList.get(mimeType);
    	        } else {
                    return null;
    	        }
			}
            
            // fetching a new parser object from pool  
			Parser theParser = (Parser) theParserPool.borrowObject(parserClassName);
            
            // checking if the created parser really supports the given mimetype 
            Hashtable supportedMimeTypes = theParser.getSupportedMimeTypes();
            if ((supportedMimeTypes != null) && (supportedMimeTypes.containsKey(mimeType))) {
				return theParser;
            }
            theParserPool.returnObject(parserClassName,theParser);
            
        } catch (Exception e) {
            System.err.println("ERROR: Unable to load the correct parser for type " + mimeType);
        }
        
        return null;
        
    }
    
    /*
    public static String urlNormalform(URL url) {
        if (url == null) return null;
        return urlNormalform(url.toString());
    }
    
    public static String urlNormalform(String us) {
        return htmlFilterContentScraper.urlNormalform(us);
    }   
    */
    
    static Map allReflinks(Map links) {
        // we find all links that are part of a reference inside a url
        HashMap v = new HashMap();
        Iterator i = links.keySet().iterator();
        String s;
        int pos;
        loop: while (i.hasNext()) {
            s = (String) i.next();
            if ((pos = s.toLowerCase().indexOf("http://",7)) > 0) {
                i.remove();
                s = s.substring(pos);
                while ((pos = s.toLowerCase().indexOf("http://",7)) > 0) s = s.substring(pos);
                if (!(v.containsKey(s))) v.put(s, "ref");
                continue loop;
            }
            if ((pos = s.toLowerCase().indexOf("/www.",7)) > 0) {
                i.remove();
                s = "http:/" + s.substring(pos);
                while ((pos = s.toLowerCase().indexOf("/www.",7)) > 0) s = "http:/" + s.substring(pos);
                if (!(v.containsKey(s))) v.put(s, "ref");
                continue loop;
            }
        }
        return v;
    }
    
    static Map allSubpaths(Map links) {
        HashMap v = new HashMap();
        Iterator i = links.keySet().iterator();
        String s;
        int pos;
        while (i.hasNext()) {
            s = (String) i.next();
            if (s.endsWith("/")) s = s.substring(0, s.length() - 1);
            pos = s.lastIndexOf("/");
            while (pos > 8) {
                s = s.substring(0, pos + 1);
                if (!(v.containsKey(s))) v.put(s, "sub");
                s = s.substring(0, pos);
                pos = s.lastIndexOf("/");
            }
        }
        return v;
    }
    
    public static void main(String[] args) {
        //javac -classpath lib/commons-collections.jar:lib/commons-pool-1.2.jar -sourcepath source source/de/anomic/plasma/plasmaParser.java
        //java -cp source:lib/commons-collections.jar:lib/commons-pool-1.2.jar de.anomic.plasma.plasmaParser bug.html bug.out
        try {
            File in = new File(args[0]);
            //File out = new File(args[1]);
            plasmaParser theParser = new plasmaParser();
            plasmaParser.initRealtimeParsableMimeTypes("application/xhtml+xml,text/html,text/plain");
            plasmaParser.initParseableMimeTypes(
                    "application/atom+xml," +
                    "application/gzip," +
                    "application/java-archive," +
                    "application/msword," +
                    "application/octet-stream," +
                    "application/pdf," +
                    "application/rdf+xml," +
                    "application/rss+xml," +
                    "application/rtf," +
                    "application/x-gzip," +
                    "application/x-tar," +
                    "application/xml," +
                    "application/zip," +
                    "text/rss," +
                    "text/rtf," +
                    "text/xml," +
                    "application/x-bzip2," +
                    "application/postscript," +
                    "text/x-vcard");
            FileInputStream theInput = new FileInputStream(in);
            ByteArrayOutputStream theOutput = new ByteArrayOutputStream();
            serverFileUtils.copy(theInput, theOutput);
            plasmaParserDocument document = theParser.parseSource(new URL("http://brain/~theli/test.ps"), null, theOutput.toByteArray());
            //plasmaParserDocument document = theParser.parseSource(new URL("http://brain.yacy"), "application/pdf", theOutput.toByteArray());
            //byte[] theText = document.getText();
            //serverFileUtils.write(theText, out);
            if (document != null) {
                String[] sentences = document.getSentences();
                if (sentences != null) for (int i = 0; i < sentences.length; i++) System.out.println("line " + i + ":" + sentences[i]);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
}

final class plasmaParserFactory implements KeyedPoolableObjectFactory {
    
    public plasmaParserFactory() {
        super();  
    }
    
    /**
     * @see org.apache.commons.pool.PoolableObjectFactory#makeObject()
     */
    public Object makeObject(Object key) throws Exception {
        
        if (!(key instanceof String))
            throw new IllegalArgumentException("The object key must be of type string.");
        
        // loading class by name
        Class moduleClass = Class.forName((String)key);
        
        // instantiating class
        Parser theParser = (Parser) moduleClass.newInstance();
        
        // setting logger that should by used
        String parserShortName = ((String)key).substring("de.anomic.plasma.parser.".length(),((String)key).lastIndexOf("."));
        
        serverLog theLogger = new serverLog("PARSER." + parserShortName.toUpperCase());
        theParser.setLogger(theLogger);
        
        return theParser;
    }          
    
     /**
     * @see org.apache.commons.pool.PoolableObjectFactory#destroyObject(java.lang.Object)
     */
    public void destroyObject(Object key, Object obj) {
        if (obj instanceof Parser) {
            Parser theParser = (Parser) obj;
        }
    }
    
    /**
     * @see org.apache.commons.pool.PoolableObjectFactory#validateObject(java.lang.Object)
     */
    public boolean validateObject(Object key, Object obj) {
        if (obj instanceof Parser) {
            Parser theParser = (Parser) obj;
            return true;
        }
        return true;
    }
    
    /**
     * @param obj 
     * 
     */
    public void activateObject(Object key, Object obj)  {
        //log.debug(" activateObject...");
    }

    /**
     * @param obj 
     * 
     */
    public void passivateObject(Object key, Object obj) { 
        //log.debug(" passivateObject..." + obj);
        if (obj instanceof Parser)  {
            Parser theParser = (Parser) obj;
            theParser.reset();
        }
    }
}    

final class plasmaParserPool extends GenericKeyedObjectPool {

    public plasmaParserPool(plasmaParserFactory objFactory,
            GenericKeyedObjectPool.Config config) {
        super(objFactory, config);
    }
    

    public Object borrowObject(Object key) throws Exception  {
       return super.borrowObject(key);
    }

    public void returnObject(Object key, Object borrowed) throws Exception  {
        super.returnObject(key,borrowed);
    }        
}