/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2000 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.updater;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import java.util.zip.CRC32;

import org.w3c.dom.*;
import org.xml.sax.InputSource;

/** This class represents module updates tracking
 *
 * @author  Ales Kemr
 */
public final class UpdateTracking {
    private static final String ELEMENT_MODULES = "installed_modules"; // NOI18N
    private static final String ELEMENT_MODULE = "module"; // NOI18N
    private static final String ATTR_CODENAMEBASE = "codename"; // NOI18N
    private static final String ELEMENT_VERSION = "module_version"; // NOI18N
    private static final String ATTR_VERSION = "specification_version"; // NOI18N
    private static final String ATTR_ORIGIN = "origin"; // NOI18N
    private static final String ATTR_LAST = "last"; // NOI18N
    private static final String ATTR_INSTALL = "install_time"; // NOI18N
    private static final String ELEMENT_FILE = "file"; // NOI18N
    private static final String ATTR_FILE_NAME = "name"; // NOI18N
    private static final String ATTR_CRC = "crc"; // NOI18N
    
    private static final String NBM_ORIGIN = "nbm"; // NOI18N
    private static final String INST_ORIGIN = "installer"; // NOI18N

    /** Platform dependent file name separator */
    private static final String FILE_SEPARATOR = System.getProperty ("file.separator");
    private static final String LOCALE_DIR = FILE_SEPARATOR + "locale" + FILE_SEPARATOR; // NOI18N

    /** The name of the install_later file */
    private static final String TRACKING_FILE_NAME = "update_tracking"; // NOI18N
    private static final String XML_EXT = ".xml"; // NOI18N

    /** maps root of clusters to tracking files. (File -> UpdateTracking) */
    private static final Map trackings = new HashMap ();
    
    /** Mapping from files defining modules to appropriate modules objects.
     * (File, Module)
     */
    private LinkedHashMap installedModules = new LinkedHashMap ();

    private boolean pError = false;
    private boolean fromUser = false;
    private final File directory;
    private final File trackingFile;
    private String origin = NBM_ORIGIN;

    
    public UpdateTracking () {
        // XXX should be deleted I think
        this (null);
    }

    /** Private constructor.
     */
    private UpdateTracking( File nbPath ) {
        assert nbPath != null : "Path cannot be null";
        
        trackingFile = new File( nbPath + FILE_SEPARATOR + TRACKING_FILE_NAME);
        directory = nbPath;
        origin = INST_ORIGIN;
    }
    
    
    //
    // Various factory and utility methods
    //
    
    /** Loads update tracking for given location 
     * @param fromuser use netbeans.user or netbeans.home
     * @return the tracking
     */
    static UpdateTracking getTracking( boolean fromuser ) {        
        UpdateTracking ut = getTracking (
            System.getProperty (fromuser ? "netbeans.user" : "netbeans.home"), // NOI18N
            fromuser
        );
        return ut;
    }

    /** Loads update tracking for given location 
     * @param cluster the name of the cluster that we want to install to
     * @param createIfDoesNotExists should new tracking be created if it does not exists
     * @return the tracking
     */
    private static UpdateTracking getTracking(String cluster, boolean createIfDoesNotExists) {        
        File f = new File (cluster);
        
        UpdateTracking ut = getTracking (f, createIfDoesNotExists);
        return ut;
    }
    
    /** Finds update tracking for given cluster root. Automatically creates
     * the cluster if this is user dir.
     *
     * @path root of a cluster
     * @return the tracking for that cluster
     */    
    public static UpdateTracking getTracking (File path) {
        return getTracking (
            path,
            path.toString ().equals (System.getProperty ("netbeans.user"))
        );
    }
    
    /** Finds update tracking for given cluster root.
     * @path root of a cluster
     * @param createIfDoesNotExists should new tracking be created if it does not exists
     * @return the tracking for that cluster
     */    
    public static UpdateTracking getTracking (File path, boolean createIfDoesNotExists) {
        try {
            path = path.getCanonicalFile ();
        } catch (java.io.IOException ex) {
            IllegalStateException ill = new IllegalStateException (ex.getMessage ());
            ill.initCause (ex);
            throw ill;
        }
     
        synchronized (trackings) {
            UpdateTracking track = (UpdateTracking)trackings.get (path);
            if (track == null) {
                File utFile = new File (path, TRACKING_FILE_NAME);
                if (!createIfDoesNotExists && !utFile.isDirectory ()) {
                    // if the update_tracking directory is missing
                    // do not allow creation at all (only in userdir)
                    return null;
                }
                
                
                track = new UpdateTracking (path);
                trackings.put (path, track);
                track.read ();
                track.scanDir ();
            }
            return track;
        }
    }
    

    /** Returns the platform installatiion directory.
     * @return the File directory.
     */
    public static File getPlatformDir () {
        return new File (System.getProperty ("netbeans.home")); // NOI18N
    }
    
    /** Returns enumeration of Files that represent each possible install
     * directory.
     * @param includeUserDir whether to include also user dir
     * @return List
     */
    public static List clusters (boolean includeUserDir) {
        ArrayList files = new ArrayList ();
        
        if (includeUserDir) {
            File ud = new File (System.getProperty ("netbeans.user"));  // NOI18N
            files.add (ud);
        }
        
        
        String dirs = System.getProperty("netbeans.dirs"); // NOI18N
        if (dirs != null) {
            Enumeration en = new StringTokenizer (dirs, File.pathSeparator);
            while (en.hasMoreElements ()) {
                File f = new File ((String)en.nextElement ());
                files.add (f);
            }
        }
        
        
        File id = getPlatformDir ();
        files.add (id);
        
        return java.util.Collections.unmodifiableList (files);
    }
    
    //
    // Useful search methods
    //
    
    /** Returns true if module with given code base is installed here
     * @param codeBase name of the module
     * @return true or false
     */
    public boolean isModuleInstalled (String codeBase) {
        Iterator it = installedModules.values ().iterator ();
        while (it.hasNext ()) {
            Module m = (Module)it.next ();
            String mm = m.codenamebase;
            int indx = mm.indexOf ('/');
            if (indx >= 0) {
                mm = mm.substring (0, indx);
            }
            if (codeBase.equals (mm)) {
                return true;
            }
        }
        return false;
    }
    
    /** Compute the list of modules that should be installed into this 
     * cluster.
     * @return List of nbm files
     */
    public List getModulesToInstall () {              
        class NbmFilter implements java.io.FilenameFilter {
            public boolean accept( File dir, String name ) {
                return name.endsWith (ModuleUpdater.NBM_EXTENSION);
            }
        }
        
        File idir = new File (directory, ModuleUpdater.DOWNLOAD_DIR);
        File[] arr = idir.listFiles (new NbmFilter ());
        if (arr == null) {
            return Collections.EMPTY_LIST;
        } else {
            return Arrays.asList (arr);
        }
    }

    
    //
    // Private impls
    //
    
    
    /** Scan through org.w3c.dom.Document document. */
    private void read() {
        /** org.w3c.dom.Document document */
        org.w3c.dom.Document document;

        File file;
        InputStream is;
        try {
            file = trackingFile;
            
            if ( ! file.isFile () )
                return;
            
            is = new FileInputStream( file );

            InputSource xmlInputSource = new InputSource( is );
            document = XMLUtil.parse( xmlInputSource, false, false, new ErrorCatcher(), XMLUtil.createAUResolver() );
            if (is != null)
                is.close();
        }
        catch ( org.xml.sax.SAXException e ) {
            System.out.println("Bad update_tracking" ); // NOI18N
            e.printStackTrace ();
            return;
        }
        catch ( java.io.IOException e ) {
            System.out.println("Missing update_tracking" ); // NOI18N
            e.printStackTrace ();
            return;
        }

        org.w3c.dom.Element element = document.getDocumentElement();
        if ((element != null) && element.getTagName().equals(ELEMENT_MODULES)) {
            scanElement_installed_modules(element, fromUser);
        }            
    }    
    
    /** Scan through org.w3c.dom.Element named installed_modules. */
    void scanElement_installed_modules(org.w3c.dom.Element element, boolean fromuser) { // 
        // element.getValue();
        org.w3c.dom.NodeList nodes = element.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            org.w3c.dom.Node node = nodes.item(i);
            if ( node.getNodeType() == org.w3c.dom.Node.ELEMENT_NODE ) {
                org.w3c.dom.Element nodeElement = (org.w3c.dom.Element)node;
                if (nodeElement.getTagName().equals(ELEMENT_MODULE)) {
                    if (true) throw new IllegalStateException ("What now!?");
                    // XXX  - should put the module into installedModules but do not know the key
                    // modules.add( scanElement_module(nodeElement, fromuser) );
                }                
            }
        }
    }
    
    /** Scan through org.w3c.dom.Element named module. */
    Module scanElement_module(org.w3c.dom.Element element, boolean fromuser) { // 
        Module module = new Module( fromuser );
        org.w3c.dom.NamedNodeMap attrs = element.getAttributes();
        for (int i = 0; i < attrs.getLength(); i++) {
            org.w3c.dom.Attr attr = (org.w3c.dom.Attr)attrs.item(i);
            if (attr.getName().startsWith(ATTR_CODENAMEBASE)) { 
                //  or old version 
                module.setCodenamebase( attr.getValue() );
            }
        }
        org.w3c.dom.NodeList nodes = element.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            org.w3c.dom.Node node = nodes.item(i);
            if ( node.getNodeType() == org.w3c.dom.Node.ELEMENT_NODE ) {
                org.w3c.dom.Element nodeElement = (org.w3c.dom.Element)node;
                if (nodeElement.getTagName().equals(ELEMENT_VERSION)) {
                    scanElement_module_version(nodeElement, module);
                }
            }
        }
        return module;
    }
    
    /** Scan through org.w3c.dom.Element named module_version. */
    void scanElement_module_version(org.w3c.dom.Element element, Module module) { // 
        Version version = new Version();        
        org.w3c.dom.NamedNodeMap attrs = element.getAttributes();
        for (int i = 0; i < attrs.getLength(); i++) {
            org.w3c.dom.Attr attr = (org.w3c.dom.Attr)attrs.item(i);
            if (attr.getName().equals(ATTR_VERSION)) { // 
                version.setVersion( attr.getValue() );
            }
            if (attr.getName().equals(ATTR_ORIGIN)) { // 
                version.setOrigin( attr.getValue() );
            }
            if (attr.getName().equals(ATTR_LAST)) { // 
                version.setLast( Boolean.valueOf(attr.getValue() ).booleanValue());
            }
            if (attr.getName().equals(ATTR_INSTALL)) { // 
                long li = 0;
                try {
                    li = Long.parseLong( attr.getValue() );
                } catch ( NumberFormatException nfe ) {
                }
                version.setInstall_time( li );
            }
        }
        org.w3c.dom.NodeList nodes = element.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            org.w3c.dom.Node node = nodes.item(i);
            if ( node.getNodeType() == org.w3c.dom.Node.ELEMENT_NODE ) {
                org.w3c.dom.Element nodeElement = (org.w3c.dom.Element)node;
                if (nodeElement.getTagName().equals(ELEMENT_FILE)) {
                    scanElement_file(nodeElement, version);
                }
            }
        }
        module.addOldVersion( version );
    }
    
    /** Scan through org.w3c.dom.Element named file. */
    void scanElement_file(org.w3c.dom.Element element, Version version) { // 
        ModuleFile file = new ModuleFile();        
        org.w3c.dom.NamedNodeMap attrs = element.getAttributes();
        for (int i = 0; i < attrs.getLength(); i++) {
            org.w3c.dom.Attr attr = (org.w3c.dom.Attr)attrs.item(i);
            if (attr.getName().equals(ATTR_FILE_NAME)) { // 
                file.setName( attr.getValue() );
            }
            if (attr.getName().equals(ATTR_CRC)) { // 
                file.setCrc( attr.getValue() );
            }
            if (attr.getName().equals(ATTR_VERSION)) {
                file.setLocaleversion( attr.getValue() );
            }
        }
        version.addFile (file );
    }
    
    Module readModuleTracking( boolean fromuser, String codename, boolean create ) {
        new File(directory, TRACKING_FILE_NAME).mkdirs();
        File file = new File (
            new File(directory, TRACKING_FILE_NAME), 
            getTrackingName( codename ) + XML_EXT 
        );
        
        // fix for #34355
        try {
            if ( file.exists() && file.length()==0 )
                file.delete();
        } catch (Exception e) {
            // ignore
        }
        
        if ( ! file.exists() ) {
            if ( create )
                return new Module( codename, file, fromuser );
            else
                return null;
        }

        return readModuleFromFile( file, codename, fromuser, create );
    }
    
    Version createVersion(String specversion) {
        Version ver = new Version();
        ver.setVersion( specversion );
        return ver;
    }
    
    private Module readModuleFromFile( File file, String codename, boolean fromuser, boolean create ) {
        
        /** org.w3c.dom.Document document */
        org.w3c.dom.Document document;
        InputStream is;
        try {
            is = new FileInputStream( file );

            InputSource xmlInputSource = new InputSource( is );
            document = XMLUtil.parse( xmlInputSource, false, false, new ErrorCatcher(), XMLUtil.createAUResolver() );
            if (is != null)
                is.close();
        } catch ( org.xml.sax.SAXException e ) {
            System.out.println("Bad update_tracking" ); // NOI18N
            e.printStackTrace ();
            return null;
        }
        catch ( java.io.IOException e ) {
            if ( create )
                return new Module( codename, file, fromuser );
            else
                return null;
        }

        org.w3c.dom.Element element = document.getDocumentElement();
        if ((element != null) && element.getTagName().equals(ELEMENT_MODULE)) {
            
            Module m = scanElement_module(element, fromuser);
            m.setFile( file );
            installedModules.put (file, m);
            return m;
        }
        if ( create )
            return new Module( codename, file, fromuser );
        else
            return null;
    }
    
    private static String getTrackingName(String codename) {
        String trackingName = codename;
        int pos = trackingName.indexOf('/');    // NOI18N
        if ( pos > -1 )
            trackingName = trackingName.substring( 0, pos );
        return trackingName.replace( '.', '-' );       // NOI18N
    }
    
    public static void convertOldFormat(File oldfile, String path, boolean fromUserDir) {
        new File( path + FILE_SEPARATOR + TRACKING_FILE_NAME ).mkdirs();
        UpdateTracking track = getTracking( fromUserDir );
        Iterator it = track.installedModules.values ().iterator();
        while ( it.hasNext() ) {
            Module mod = (Module)it.next();
            File newfile = new File( path + FILE_SEPARATOR + TRACKING_FILE_NAME + FILE_SEPARATOR
                    + getTrackingName( mod.getCodenamebase() ) + XML_EXT );
            mod.setFile( newfile );
            mod.write();
        }
        oldfile.delete();
    }

    public String getL10NSpecificationVersion(String codenamebase, boolean fromUserDir, String jarpath) {
        Module module = readModuleTracking( fromUserDir, codenamebase, false );
        if ( module == null )
            return null;
        
        return module.getL10NSpecificationVersion( jarpath );
    }
    
    void deleteUnusedFiles() {
        List newModules = new ArrayList (installedModules.values ());
        Iterator it = newModules.iterator();
        while ( it.hasNext() ) {
            Module mod = (Module)it.next();
            mod.deleteUnusedFiles();
        }
        scanDir ();
    }
    
    public static long getFileCRC(File file) throws IOException {
        BufferedInputStream bsrc = null;
        CRC32 crc = new CRC32();
        try {
            bsrc = new BufferedInputStream( new FileInputStream( file ) );
            byte[] bytes = new byte[1024];
            int i;
            while( (i = bsrc.read()) != -1 ) {
                crc.update( (byte)i );
            }
        }
        finally {
            if ( bsrc != null )
                bsrc.close();
        }
        return crc.getValue();
    }
    
    private void scanDir () {
        File dir = new File (directory, TRACKING_FILE_NAME);
        File[] files = dir.listFiles( new FileFilter() {
                               public boolean accept( File file ) {
                                   if ( !file.isDirectory() && file.getName().toUpperCase().endsWith(".XML") ) // NOI18N
                                       return true;
                                   else
                                       return false;
                               }
                           } );
                           
        if (files == null) {
            return;
        }
                           
        for ( int i = 0; i < files.length; i++ ) {
            if (!installedModules.containsKey (files[i])) {
                readModuleFromFile( files[i], null, fromUser, true );
            }
                
        }
    }
    
    class Module extends Object {        
        
        /** Holds value of property codenamebase. */
        private String codenamebase;
        
        /** Holds value of property versions. */
        private List versions = new ArrayList();
        
        private File file = null;
        
        private boolean fromUser = true;
        
        public Module() {
        }
        
        public Module(boolean fromUser) {
            this.fromUser = fromUser;
        }
        
        public Module(String codenamebase, File file, boolean fromUser) {
            this.codenamebase = codenamebase;
            this.file = file;
            this.fromUser = fromUser;
        }
        
        private Version lastVersion = null;
        private Version newVersion = null;
        
        /** Getter for property codenamebase.
         * @return Value of property codenamebase.
         */
        String getCodenamebase() {
            return codenamebase;
        }
        
        /** Setter for property codenamebase.
         * @param codenamebase New value of property codenamebase.
         */
        void setCodenamebase(String codenamebase) {
            this.codenamebase = codenamebase;
        }
        
        /** Getter for property versions.
         * @return Value of property versions.
         */
        List getVersions() {
            return versions;
        }
        
        /** Setter for property versions.
         * @param versions New value of property versions.
         */
        void setVersions(List versions) {
            this.versions = versions;
        }
        
        boolean isFromUser() {
            return fromUser;
        }
        
        void setFromUser(boolean fromUser) {
            this.fromUser = fromUser;
        }
        
        private Version getNewOrLastVersion() {
            if ( newVersion != null )
                return newVersion;
            else
                return lastVersion;
        }
        
        boolean hasNewVersion() {
            return newVersion != null;
        }
        
        void setFile(File file) {
            this.file = file;
        }
        
        public Version addNewVersion( String spec_version ) {
            if ( lastVersion != null )
                lastVersion.setLast ( false );
            Version version = new Version();        
            newVersion = version;
            version.setVersion( spec_version );
            version.setOrigin( origin );
            version.setLast( true );
            version.setInstall_time( System.currentTimeMillis() );
            versions.add( version );
            return version;
        }
        
        void addOldVersion( Version version ) {
            if ( version.isLast() )
                lastVersion = version;
                    
            versions.add( version );
        }
        
        void addL10NVersion( Version l_version ) {
            if ( lastVersion != null )
                lastVersion.addL10NFiles( l_version.getFiles() );
            else {
                l_version.setOrigin( origin );
                l_version.setLast( true );
                l_version.setInstall_time( System.currentTimeMillis() );
                versions.add( l_version );
            }
        }
        
        void writeConfigModuleXMLIfMissing () {
            File configDir = new File (new File (directory, "config"), "Modules"); // NOI18N
            
            String name = codenamebase;
            int indx = name.indexOf ('/');
            if (indx > 0) {
                name = name.substring (0, indx);
            }
            
            String dash = name.replace ('.', '-');
            File config = new File (configDir,  dash + ".xml");
            if (config.isFile ()) {
                // already written
                return;
            }
            
            config.getParentFile ().mkdirs ();
            
            boolean isAutoload = false;
            boolean isEager = false;
            String file = null;
            
            java.util.Iterator it = newVersion.getFiles ().iterator ();
            while (it.hasNext ()) {
                ModuleFile f = (ModuleFile)it.next ();
                
                String n = f.getName ();
                if (n.endsWith (".jar") && n.indexOf ("modules") >= 0) { // NOI18N
                    file = f.getName ();
                }
                
                String parentDir = new File (f.getName ()).getParentFile ().getName ();
                if ("autoload".equals (parentDir)) { // NOI18N
                    isAutoload = true;
                }
                if ("eager".equals (parentDir)) { // NOI18N
                    isEager = true;
                }
            }
            
            boolean isEnabled = !isAutoload && !isEager;

            String spec = newVersion.getVersion ();
            OutputStream os; 
            try {
                os = new FileOutputStream(config);
                PrintWriter pw = new PrintWriter(new java.io.OutputStreamWriter(os, "UTF-8"));
                // Please make sure formatting matches what the IDE actually spits
                // out; it could matter.
                pw.println("");
                pw.println("");
                pw.println("");
                pw.println("    " + isAutoload + "");
                pw.println("    " + isEager + "");
                if (!isAutoload && !isEager) {
                    pw.println("    " + isEnabled + "");
                }
                pw.println("    " + file + "");
                pw.println("    false");
                pw.println("    " + spec + "");
                pw.println("");
                pw.flush();
                pw.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            
        }
        
        void write( ) {
            Document document = XMLUtil.createDocument(ELEMENT_MODULE);
            
            Element e_module = document.getDocumentElement();
            Element e_version = null;
            Element e_file = null;
            
            e_module.setAttribute(ATTR_CODENAMEBASE, getCodenamebase());
            Iterator it2 = getVersions().iterator();
            while ( it2.hasNext() ) {
                Version ver = (Version)it2.next();
                e_version = document.createElement(ELEMENT_VERSION);
                if ( ver.getVersion() != null )
                    e_version.setAttribute(ATTR_VERSION, ver.getVersion());
                e_version.setAttribute(ATTR_ORIGIN, ver.getOrigin());
                e_version.setAttribute(ATTR_LAST, new Boolean( ver.isLast() ).toString());
                e_version.setAttribute(ATTR_INSTALL, Long.toString(ver.getInstall_time()));                
                e_module.appendChild( e_version );
                Iterator it3 = ver.getFiles().iterator();
                while ( it3.hasNext() ) {
                    ModuleFile file = (ModuleFile)it3.next();
                    e_file = document.createElement(ELEMENT_FILE);
                    e_file.setAttribute(ATTR_FILE_NAME, file.getName());
                    e_file.setAttribute(ATTR_CRC, file.getCrc());
                    if ( file.getLocaleversion() != null )
                        e_file.setAttribute(ATTR_VERSION, file.getLocaleversion());
                    e_version.appendChild( e_file );                
                }
            }
            
            document.getDocumentElement().normalize();

            try {
                OutputStream os = new FileOutputStream( file );
                XMLUtil.write(document, os);            
                os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }        
        }

        void deleteUnusedFiles() {
            if ( lastVersion == null || newVersion == null )
                return;
            Iterator it = lastVersion.getFiles().iterator();
            while ( it.hasNext() ) {
                ModuleFile modFile = (ModuleFile)it.next();
                if ( ! newVersion.containsFile( modFile ) && modFile.getName().indexOf( LOCALE_DIR ) == -1 )
                    safeDelete( modFile );
            }
        }
        
        private void safeDelete(ModuleFile modFile) {
            // test file existence
            File f = new File( file.getParentFile().getParent() + FILE_SEPARATOR + modFile.getName() );
            if ( f.exists() ) {
                // test crc
                try {
                    if ( ! Long.toString( getFileCRC( f ) ).equals( modFile.getCrc() ) )
                        return;
                } catch ( IOException ioe ) {
                    return;
                }

                // test if file is referenced from other module
                scanDir();
                boolean found = false;
                Iterator it = installedModules.values ().iterator();
                while ( !found && it.hasNext() ) {
                    Module mod = (Module)it.next();
                    if ( ! mod.equals( this ) ) {
                        Version v = mod.getNewOrLastVersion();
                        if ( v != null && v.containsFile( modFile ) )
                            found = true;
                    }
                }
                if ( ! found )
                    f.delete();
            }
        }
        
        String getL10NSpecificationVersion(String jarpath) {
            String localever = null;
            Collections.sort( versions );
            Iterator it = versions.iterator();
            while ( it.hasNext() ) {
                Version ver = (Version) it.next();
                localever = ver.getLocaleVersion( jarpath );
                if ( localever != null )
                    return localever;
            }
            return null;
        }
    }
    
    public class Version extends Object implements Comparable {
        
        /** Holds value of property version. */
        private String version;
        
        /** Holds value of property origin. */
        private String origin;
        
        /** Holds value of property last. */
        private boolean last;
        
        /** Holds value of property install_time. */
        private long install_time = 0;
        
        /** Holds value of property files. */
        private List files = new ArrayList();
        
        /** Getter for property version.
         * @return Value of property version.
         */
        String getVersion() {
            return version;
        }
        
        /** Setter for property version.
         * @param version New value of property version.
         */
        void setVersion(String version) {
            this.version = version;
        }
        
        /** Getter for property origin.
         * @return Value of property origin.
         */
        String getOrigin() {
            return origin;
        }
        
        /** Setter for property origin.
         * @param origin New value of property origin.
         */
        void setOrigin(String origin) {
            this.origin = origin;
        }
        
        /** Getter for property last.
         * @return Value of property last.
         */
        boolean isLast() {
            return last;
        }
        
        /** Setter for property last.
         * @param last New value of property last.
         */
        void setLast(boolean last) {
            this.last = last;
        }
        
        /** Getter for property install_time.
         * @return Value of property install_time.
         */
        long getInstall_time() {
            return install_time;
        }
        
        /** Setter for property install_time.
         * @param install_time New value of property install_time.
         */
        void setInstall_time(long install_time) {
            this.install_time = install_time;
        }
        
        /** Getter for property files.
         * @return Value of property files.
         */
        List getFiles() {
            return files;
        }
        
        /** Setter for property files.
         * @param files New value of property files.
         */
        void addL10NFiles(List l10nfiles) {
            Iterator it = l10nfiles.iterator();
            while ( it.hasNext() ) {
                ModuleFile lf = (ModuleFile) it.next();
                String lname = lf.getName();
                for ( int i = files.size() - 1; i >=0; i-- ) {
                    ModuleFile f = (ModuleFile) files.get( i );
                    if ( f.getName().equals( lname ) )
                        files.remove( i );
                }
            }
            files.addAll( l10nfiles );
        }
        
        void addFile( ModuleFile file ) {
            files.add( file );
        }
        
        public void addFileWithCrc( String filename, String crc ) {
            ModuleFile file = new ModuleFile();
            file.setName( filename );
            file.setCrc( crc );
            files.add( file );
        }
        
        public void addL10NFileWithCrc( String filename, String crc, String specver ) {
            ModuleFile file = new ModuleFile();
            file.setName( filename );
            file.setCrc( crc );
            file.setLocaleversion( specver );
            files.add( file );
        }
        
        boolean containsFile( ModuleFile file ) {
            Iterator it = files.iterator();
            while ( it.hasNext() ) {
                ModuleFile f = (ModuleFile)it.next();
                if ( f.getName().equals( file.getName() ) )
                    return true;
            }
            return false;
        }
        
        ModuleFile findFile(String filename) {
            Iterator it = files.iterator();
            while ( it.hasNext() ) {
                ModuleFile f = (ModuleFile)it.next();
                if ( f.getName().equals( filename ) )
                    return f;
            }
            return null;
        }
        
        String getLocaleVersion(String filename) {
            String locver = null;
            ModuleFile f = findFile( filename );
            if ( f != null ) {
                locver = f.getLocaleversion();
                if ( locver == null )
                    locver = version;
            }
            return locver;
        }
        
        public int compareTo(Object obj) {
            Version oth = (Version)obj;
            if ( install_time < oth.getInstall_time() )
                return 1;
            else if ( install_time > oth.getInstall_time() )
                return -1;
            else
                return 0;
        }
    }
    
    class ModuleFile extends Object {        
        
        /** Holds value of property name. */
        private String name;
        
        /** Holds value of property crc. */
        private String crc;
        
        /** Holds value of property localeversion. */
        private String localeversion = null;
        
        /** Getter for property name.
         * @return Value of property name.
         */
        String getName() {
            return name;
        }
        
        /** Setter for property name.
         * @param name New value of property name.
         */
        void setName(String name) {
            this.name = name;
        }
        
        /** Getter for property crc.
         * @return Value of property crc.
         */
        String getCrc() {
            return crc;
        }
        
        /** Setter for property crc.
         * @param crc New value of property crc.
         */
        void setCrc(String crc) {
            this.crc = crc;
        }
        
        /** Getter for property localeversion.
         * @return Value of property localeversion.
         *
         */
        public String getLocaleversion() {
            return this.localeversion;
        }
        
        /** Setter for property localeversion.
         * @param localeversion New value of property localeversion.
         *
         */
        public void setLocaleversion(String localeversion) {
            this.localeversion = localeversion;
        }
        
    }

    class ErrorCatcher implements org.xml.sax.ErrorHandler {
        private void message (String level, org.xml.sax.SAXParseException e) {
            pError = true;
        }

        public void error (org.xml.sax.SAXParseException e) {
            // normally a validity error
            pError = true;
        }

        public void warning (org.xml.sax.SAXParseException e) {
            //parseFailed = true;
        }

        public void fatalError (org.xml.sax.SAXParseException e) {
            pError = true;
        }
    }
    
}