Application: gvSIG desktop

package org.gvsig.remoteClient.utils;

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * 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.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

import java.io.BufferedOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.ConnectException;

import java.net.URL;

import java.net.UnknownHostException;

import java.rmi.NoSuchObjectException;

import java.util.Hashtable;

import java.util.StringTokenizer;

import java.util.Vector;

import org.gvsig.remoteClient.wms.ICancellable;

/**

 * Clase con m?todos de utilidad en el protocolo WMS

 *

 * @authors Laura D?az, jaume dominguez faus

 */

public class Utilities {

        private static String characters;

        static boolean canceled;

        static final long latency = 500;

        /**

     * <b>key</b>: URL, <b>value</b>: path to the downloaded file.

     */

    private static Hashtable downloadedFiles;

        static Exception downloadException;

    private static final String tempDirectoryPath = System.getProperty("java.io.tmpdir")+"/tmp-andami";

        static {

                characters = "";

                for (int j = 32; j<=127; j++){

                        characters += (char) j;

                }

                characters += "?????????????????????????????????????????????????\n\r\f\t??";

        }

        /**

         * Checks a File and tries to figure if the file is a text or a binary file.<br>

         * Keep in mind that binary files are those that contains at least one

         * non-printable character.

         * 

         * @param file

         * @return <b>true</b> when the file is <b>pretty problably</b> text, 

         * <b>false</b> if the file <b>is</b> binary.

         */

        public static boolean isTextFile(File file){

                return isTextFile(file, 1024);

        }

        /**

         * Checks a File and tries to figure if the file is a text or a binary file.<br>

         * Keep in mind that binary files are those that contains at least one

         * non-printable character. 

         * 

         * @param file

         * @param byteAmount, number of bytes to check.

         * @return <b>true</b> when the file is <b>pretty problably</b> text, 

         * <b>false</b> if the file <b>is</b> binary.

         */

        public static boolean isTextFile(File file, int byteAmount){

                int umbral = byteAmount; 

                try {

                        FileReader fr = new FileReader(file);

                        for (int i = 0; i < umbral; i++) {

                                int c = fr.read();

                                if (c==-1){

                                        // End of file. If we reach this

                                        // everything before is printable data.

                                        return true;

                                }

                                char ch = (char) c;

                                if (characters.indexOf(ch)==-1){

                                        // We've found a non-printable character.

                                        // Then we'll assume that this file is binary.

                                        return false;

                                }

                        }

                } catch (FileNotFoundException e) {

                        e.printStackTrace();

                } catch (IOException e) {

                        e.printStackTrace();

                }

                return true;

        }

        /**

         * Checks a byte array and tells if it contains only text or contains

         * any binary data.

         * 

         * @param file

         * @return <b>true</b> when the data is <b>only</b> text, <b>false</b> otherwise.

         * @deprecated

         */

        public static boolean isTextData(byte[] data){

                char[] charData = new char[data.length];

                for (int i = 0; i<data.length; i++){

                        charData[i] = (char) data[i];

                }

                for (int i = 0; i < data.length; i++) {

                        int c = charData[i];

                        if (c==-1){

                                // End of file. If we reach this

                                // everything before is printable data.

                                return true;

                        }

                        char ch = (char) c;

                        if (characters.indexOf(ch)==-1){

                                // We've found a non-printable character.

                                // Then we'll assume that this file is binary.

                                //System.out.println(ch+" at "+i);

                                return false;

                        }

                }

                return true;

        }

        /**

         * Copia el contenido de un InputStream en un OutputStream

         *

         * @param in InputStream

         * @param out OutputStream

         */

        public static void serializar(InputStream in, OutputStream out) {

                byte[] buffer = new byte[102400];

                int n;

                try {

                        while ((n = in.read(buffer)) != -1) {

                                out.write(buffer, 0, n);

                        }

                } catch (IOException e) {

                        e.printStackTrace();

                }

        }

        /**

         * Elimina del xml la declaraci?n del DTD

         *

         * @param bytes bytes del fichero XML de respuesta a getCapabilities

         * @param startTag Tag raiz del xml respuesta a getCapabilities

         *

         * @return bytes del fichero XML sin la declaraci?n del DTD

         */

        public static byte[] eliminarDTD(byte[] bytes, String startTag) {

                String text = new String(bytes);

                int index1 = text.indexOf("?>") + 2;

                int index2;

                try {

                        index2 = findBeginIndex(bytes, startTag);

                } catch (NoSuchObjectException e) {

                        return bytes;

                }

                byte[] buffer = new byte[bytes.length - (index2 - index1)];

                System.arraycopy(bytes, 0, buffer, 0, index1);

                System.arraycopy(bytes, index2, buffer, index1, bytes.length - index2);

                return buffer;

        }

        /**

         * Obtiene el ?ndice del comienzo del xml

         *

         * @param bytes bytes del fichero XML en el que se busca

         * @param tagRaiz Tag raiz del xml respuesta a getCapabilities

         *

         * @return ?ndice donde empieza el tag raiz

         *

         * @throws NoSuchObjectException Si no se encuentra el tag

         */

        private static int findBeginIndex(byte[] bytes, String tagRaiz)

        throws NoSuchObjectException {

                try {

                        int nodo = 0;

                        int ret = -1;

                        int i = 0;

                        while (true) {

                                switch (nodo) {

                                case 0:

                                        if (bytes[i] == '<') {

                                                ret = i;

                                                nodo = 1;

                                        }

                                        break;

                                case 1:

                                        if (bytes[i] == ' ') {

                                        } else if (bytes[i] == tagRaiz.charAt(0)) {

                                                nodo = 2;

                                        } else {

                                                nodo = 0;

                                        }

                                        break;

                                case 2:

                                        String aux = new String(bytes, i, 18);

                                        if (aux.equalsIgnoreCase(tagRaiz.substring(1))) {

                                                return ret;

                                        }

                                        nodo = 0;

                                        break;

                                }

                                i++;

                        }

                } catch (Exception e) {

                        throw new NoSuchObjectException("No se pudo parsear el xml");

                }

        }

        /**

         * Converts the contents of a Vector to a comma separated list

         * 

         * */

        public static String Vector2CS(Vector v)

        {

                String str = new String();        

                if (v != null)

                {

                        int i;

                        for (i=0; i<v.size() ;i++)

                        {

                                str = str + v.elementAt(i);

                                if (i<v.size()-1)

                                        str = str + ",";

                        }

                }

                return str;

        }

        public static boolean isValidVersion(String version)

        {

                if(version.trim().length() == 5)

                {

                        if ( (version.charAt(1)=='.') && (version.charAt(3)=='.'))

                        {

                                char x = version.charAt(0);

                                char y = version.charAt(2);

                                char z = version.charAt(4);

                                if ((Character.isDigit(x)) && (Character.isDigit(y)) && (Character.isDigit(z)))

                                {

                                        return true;

                                }

                                else

                                {

                                        return false;

                                }

                        }

                        else

                        {

                                return false;

                        }

                }

                else

                {

                        return false;

                }

        }

        /**

         * Crea un fichero temporal con un nombre concreto y unos datos pasados por

         * par?metro.

         * @param fileName Nombre de fichero

         * @param data datos a guardar en el fichero

         */

        public static void createTemp(String fileName, String data)throws IOException{

                File f = new File(fileName);

                DataOutputStream dos = new DataOutputStream( new BufferedOutputStream(new FileOutputStream(f)) );

                dos.writeBytes(data);

                dos.close();

                f.deleteOnExit();

        }

        /**

         * Checks if a String is a number or not

         * 

         * @param String, s

         * @return boolean, true if s is a number

         */

        public static boolean isNumber(String s) 

        {

                try

                {

                        //double d = Double.parseDouble(s);

                        return true;

                }

                catch(NumberFormatException e)

                {

                        return false;

                }

        }  

        /**

         * Parses the String containing different items [character] separated and

         * creates a vector with them.

         * @param str String contains item1[c]item2[c]item3...

         * @param c is the string value for separating the items

         * @return Vector containing all the items

         */

        public static Vector createVector(String str, String c)

        {

                StringTokenizer tokens = new StringTokenizer(str, c);

                Vector v = new Vector();

                try

                {

                        while (tokens.hasMoreTokens())

                        {

                                v.addElement(tokens.nextToken());

                        }

                        return v;

                }

                catch (Exception e)

                {

                        return new Vector();

                }

        }

        /**

         * @param dimensions

         * @return

         */

        public static String Vector2URLParamString(Vector v) {

                if (v==null) return "";

                String s = "";

                for (int i = 0; i < v.size(); i++) {

                        s += v.get(i);

                        if (i<v.size()-1)

                                s += "&";

                }

                return s;

        }

        /**

     * Returns the content of this URL as a file from the file system.<br>

     * <p>

     * If the URL has been already downloaded in this session and notified 

     * to the system using the static <b>Utilities.addDownloadedURL(URL)</b>

     * method, it can be restored faster from the file system avoiding to

     * download it again.

     * </p>

     * @param url

     * @return File containing this URL's content or null if no file was found.

     */

    private static File getPreviousDownloadedURL(URL url){

        File f = null;

        if (downloadedFiles!=null && downloadedFiles.containsKey(url)){

            String filePath = (String) downloadedFiles.get(url);

            f = new File(filePath);

            if (!f.exists())

                    return null;

        }

        return f;

    }

    /**

     * Adds an URL to the table of downloaded files for further uses. If the URL

     * already exists in the table its filePath value is updated to the new one and

     * the old file itself is removed from the file system.

     * 

     * @param url

     * @param filePath

     */

    static void addDownloadedURL(URL url, String filePath){

        if (downloadedFiles==null)

            downloadedFiles = new Hashtable();

        String fileName = (String) downloadedFiles.put(url, filePath);

        //JMV: No se puede eliminar el anterior porque puede que alguien lo

        // este usando

        /*

        if (fileName!=null){

            File f = new File(fileName);

            if (f.exists())

                f.delete();

        }

        */

    }

    /**

     * Downloads an URL into a temporary file that is removed the next time the 

     * tempFileManager class is called, which means the next time gvSIG is launched.

     * 

     * @param url

     * @param name

     * @return

     * @throws IOException

     * @throws ServerErrorResponseException

     * @throws ConnectException

     * @throws UnknownHostException

     */

    public static synchronized File downloadFile(URL url, String name, ICancellable cancel) throws IOException,ConnectException, UnknownHostException{

            File f = null;

            if ((f=getPreviousDownloadedURL(url))==null){

                    File tempDirectory = new File(tempDirectoryPath);

                    if (!tempDirectory.exists())

                            tempDirectory.mkdir();

                    f = new File(tempDirectoryPath+"/"+name+System.currentTimeMillis());

                    if (cancel == null) {

                            cancel = new ICancellable() {

                                        public boolean isCanceled() {

                                                return false;

                                        }

                            };

                    }

                    Thread downloader = new Thread(new Downloader(url, f));

                    Thread monitor = new Thread(new Monitor(cancel));

                    monitor.start();

                    downloader.start();

                    while(!canceled && downloader.isAlive()) {

                            try {

                                        Thread.sleep(latency);

                                } catch (InterruptedException e) {

                                        // TODO Auto-generated catch block

                                        e.printStackTrace();

                                }

                    }

                    downloader = null;

                    monitor = null;

                    if (Utilities.downloadException!=null) {

                            Exception e = Utilities.downloadException;

                            if (e instanceof IOException)

                                    throw (IOException) e;

                            else if (e instanceof ConnectException)

                                    throw (ConnectException) e;

                            else if (e instanceof UnknownHostException)

                                    throw (UnknownHostException) e;

                    }

            }

            return f;

        }

    /**

     * Cleans every temporal file previously downloaded.

     */

    public static void cleanUpTempFiles() {

            try{

                    File tempDirectory = new File(tempDirectoryPath);

                    File[] files = tempDirectory.listFiles();

                    if (files!=null) {

                            for (int i = 0; i < files.length; i++) {

                                     // s?lo por si en un futuro se necesitan crear directorios temporales

                                    if (files[i].isDirectory())        deleteDirectory(files[i]);

                                    files[i].delete();

                            }

                    }

                    tempDirectory.delete();

            } catch (Exception e) {        }

    }

    /**

     * Recursive directory delete.

     * @param f

     */

        private static void deleteDirectory(File f) {

                File[] files = f.listFiles();

                for (int i = 0; i < files.length; i++) {

                        if (files[i].isDirectory()) deleteDirectory(files[i]);

                        files[i].delete();

                }

        }

    /**

     * Remove an URL from the system cache. The file will remain in the file

     * system for further eventual uses.

     * @param request

     */

        public static void removeURL(URL url) {

                if (downloadedFiles != null && downloadedFiles.containsKey(url))

                        downloadedFiles.remove(url);

        }

}

final class Monitor implements Runnable {

        ICancellable c;

        public Monitor(ICancellable cancel) {

                Utilities.canceled = false;

                this.c = cancel;

        }

        public void run() {

                while (!c.isCanceled()) {

                        try {

                                Thread.sleep(Utilities.latency);

                        } catch (InterruptedException e) {

                                // TODO Auto-generated catch block

                                e.printStackTrace();

                        }

                }

                Utilities.canceled = true;

        }

}

final class Downloader implements Runnable {

        private URL url;

        private File dstFile;

        public Downloader(URL url, File dstFile) {

                this.url = url;

                this.dstFile = dstFile;

                Utilities.downloadException = null;

        }

        public void run() {

                System.out.println("downloading '"+url.toString()+"' to: "+dstFile.getAbsolutePath());

                DataOutputStream dos;

                try {

                        dos = new DataOutputStream( new BufferedOutputStream(new FileOutputStream(dstFile)));

                        byte[] buffer = new byte[1024*4]; 

                        DataInputStream is = new DataInputStream(url.openStream());

                        long readed = 0;

                        for (int i = is.read(buffer); !Utilities.canceled && i>0; i = is.read(buffer)){

                                dos.write(buffer, 0, i);

                                readed += i;

                        }

                        dos.close();

                        is.close();

                        is = null;

                        dos = null;

                        if (Utilities.canceled) {

                                System.err.println("[RemoteClients] '"+url+"' CANCELED.");

                                dstFile.delete();

                                dstFile= null;

                        } else {

                                Utilities.addDownloadedURL(url, dstFile.getAbsolutePath());

                        }

                } catch (Exception e) {

                        Utilities.downloadException = e;

                }

        }

}