Application: gvSIG desktop

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

 *

 * Copyright (C) 2007 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

 */

package com.iver.andami.iconthemes;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.Enumeration;

import java.util.zip.ZipEntry;

import java.util.zip.ZipException;

import java.util.zip.ZipFile;

import org.kxml2.io.KXmlParser;

import org.xmlpull.v1.XmlPullParserException;

/**

 * <p>This class deals with icon themes, it understands the on-disk theme

 * format, it is able to list the availabe themes, to get the default

 * theme and to change it.</p>

 * 

 * <p>A XML theme description file should look similar to:

 * <pre>

 * <?xml version="1.0" encoding="utf-8"?>

 * <theme>

 *        <name>Default gvSIG icon theme</name>

 *        <description>Clear fancy super great icon theme for gvSIG. Author: Salvador Dal?, <salvador.dali@art.org> </description>

 *        <version>1.2</version>

 * </theme>

 * </pre>

 *   

 * 

 * @author Cesar Martinez Izquierdo <cesar.martinez@iver.es>

 *

 */

public class IconThemeManager {

        protected File themesDir = null;

        protected final String themeDefinitionFile = "theme.xml";

        /**

         * 

         * @param themesDir

         */

        public IconThemeManager(File themesDir) {

                this.themesDir = themesDir;                

        }

        /**

         * 

         * @return

         */

        public IconThemeInfo[] list() {

                File[] files = themesDir.listFiles();

                if (files==null) return null;

                ArrayList themeList = new ArrayList();

                IconThemeInfo info;

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

                        if (files[i].isDirectory()) {

                                info = readInfoFromDir(files[i]);

                                if (info!=null)

                                        themeList.add(info);

                        }

                        else if (files[i].isFile()) { // ensure it's a regular file

                                info = readInfoFromZip(files[i]);

                                if (info!=null)

                                        themeList.add(info);

                        }

                }

                return (IconThemeInfo[]) themeList.toArray(new IconThemeInfo[0]);

        }

        private IconThemeInfo readInfoFromDir(File dir){

                File themeDefinition = new File(dir + File.separator + themeDefinitionFile);

                IconThemeInfo themeInfo;

                try {

                        // try reading the XML file

                        if (themeDefinition.exists() && themeDefinition.isFile()) {

                                themeInfo = readXML(new FileInputStream(themeDefinition));

                                themeInfo.setResource(dir);

                                return themeInfo;

                        }

                } catch (IOException e) {}

                catch (XmlPullParserException e) {}

                // the XML parsing failed, just show the dir name

                themeInfo = new IconThemeInfo();

                themeInfo.setName(dir.getName());

                themeInfo.setDescription(dir.getName());

                themeInfo.setResource(dir);

                return themeInfo;

        }

        private IconThemeInfo readXML(InputStream xmlStream) throws XmlPullParserException, IOException {

                KXmlParser parser = new KXmlParser();

                // we use null encoding, in this way kxml2 tries to detect the encoding                

                parser.setInput(xmlStream, null);

                IconThemeInfo themeInfo = new IconThemeInfo();

                for (parser.next(); parser.getEventType()!=KXmlParser.END_DOCUMENT; parser.next()) {

                        // este bucle externo recorre las etiquetas de primer y segundo nivel

                        if (parser.getEventType()==KXmlParser.START_TAG) {

                                if (parser.getName().equals("name")) {

                                        themeInfo.setName(parser.nextText());

                                }

                                else if (parser.getName().equals("description")) {

                                        themeInfo.setDescription(parser.nextText());

                                }

                                else if (parser.getName().equals("version")) {

                                        themeInfo.setVersion(parser.nextText());

                                }

                        }

                }        

                return themeInfo;

        }

        private IconThemeInfo readInfoFromZip(File zipFile) {

                try {

                        ZipFile file = new ZipFile(zipFile);

                        IconThemeInfo themeInfo;

                        Enumeration entries = file.entries();

                        ZipEntry xmlEntry=null, dirEntry=null;

                        // search for theme.xml and the directory names

                        while (entries.hasMoreElements() && (xmlEntry==null||dirEntry==null)) {

                                ZipEntry entry = (ZipEntry) entries.nextElement();

                                if (entry.isDirectory()) {

                                        dirEntry = entry;

                                }

                                if (entry.getName().equals(themeDefinitionFile)) {

                                        xmlEntry = entry;

                                }

                        }

                        try {

                                // try with the XML file

                                if (xmlEntry!=null) {

                                        themeInfo = readXML(file.getInputStream(xmlEntry));

                                        themeInfo.setResource(zipFile);

                                }

                        } catch (XmlPullParserException e) {}

                        themeInfo = new IconThemeInfo();

                        themeInfo.setResource(zipFile);

                        // now try with the directory

                        if (dirEntry!=null) {

                                themeInfo.setName(dirEntry.getName());

                                themeInfo.setDescription(dirEntry.getName());

                                return themeInfo;

                        }

                        else { // otherwise just use the zipName

                                themeInfo.setName(zipFile.getName());

                                themeInfo.setDescription(zipFile.getName());

                                return themeInfo;

                        }

                } catch (ZipException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                } catch (IOException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                }

                return null;

        }

}