Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3

 * 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.app.gui.styling;

import java.io.File;

import java.io.FileFilter;

import java.util.Vector;

import javax.swing.AbstractListModel;

import javax.swing.SwingUtilities;

import org.gvsig.fmap.mapcontext.MapContextLocator;

import org.gvsig.fmap.mapcontext.rendering.symbols.ISymbol;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dispose.Disposable;

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.task.CancellableTask;

import org.gvsig.tools.visitor.VisitCanceledException;

import org.gvsig.tools.visitor.Visitor;

import org.gvsig.utils.listManager.ListModel;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * Class SymbolSelectorListModel implements a list to select symbols.This list

 * has the property that allows the user to stablish a filter to accept or

 * reject elements for it from a directory which is also specified when the

 * SymbolSelectorModel is created.

 * 

 */

public class SymbolSelectorListModel extends AbstractListModel implements

                ListModel, Disposable {

        private static Logger logger = LoggerFactory.getLogger(SymbolSelectorListModel.class);

        private String fileExtension;

        private SelectorFilter sfilter;

        private Vector<ISymbol> elements;

        private File folder;

        private CancellableTask symbolLoader = null;

        /**

         * <p>

         * Creates a new instance of the model for the list in the Symbol Selector

         * window where the symbols are stored in the <b>dir</b> (root directory)

         * param.<br>

         * </p>

         * <p>

         * The <b>filter</b> is a user defined filter used to know which elements in

         * the folder are accepted or rejected for this list and it is used to avoid

         * mixing marker symbols for polygons for example.<br>

         * </p>

         * <p>

         * <b>fileExtension</b> param defines the extension of the file to be

         * parsed. This is like that to enable inheritance of this class to other

         * file selector such as StyleSelector.

         * 

         * @param dir

         *            , the root dir where symbols are located.

         * @param filter

         *            , the filter used to show or hide some elements.

         * @param fileExtension

         *            , file extension used for the files to be parsed.

         */

        public SymbolSelectorListModel(File dir, SelectorFilter filter,

                        String fileExtension) {

                this.fileExtension = fileExtension;

                this.folder = dir;

                this.sfilter = filter;

        }

        public synchronized void dispose() {

                /*

                 * Quien destruye la instancia de la clase se encarga de llamar al dispose

                 * pero no hace falta hacer seguimieto de las instancias de esta que hay

                 * en ejecucion, por eso no se a?ade en el constructor la instancia a la

                 * lista de disposable del DisposableManager.

                 */

                if( this.symbolLoader!=null ) {

                        this.symbolLoader.cancelRequest();

                }

        }

        public Object remove(int i) throws ArrayIndexOutOfBoundsException {

                ISymbol o = elements.remove(i);

                this.fireIntervalRemoved(this, i, i);

                return o;

        }

        public void insertAt(int i, Object o) {

                getObjects().insertElementAt((ISymbol) o, i);

                this.fireIntervalAdded(this, i, i);

        }

        protected boolean accepts(ISymbol symbol) {

                if (sfilter == null) {

                        return true;

                }

                return sfilter.accepts(symbol);

        }

        public void add(Object o) {

                ISymbol symbol = (ISymbol) o;

                if (!accepts(symbol)) {

                        return;

                }

                Vector<ISymbol> e = this.getObjects();

                e.add((ISymbol) o);

                try {

                        int n = e.size();

                        this.fireIntervalAdded(this, n - 1, n);

                } catch (Exception ex) {

                        // Do nothing.

                }

        }

        public Vector<ISymbol> getObjects() {

                if (elements == null) {

                        elements = new Vector<ISymbol>(0);

                        FileFilter fileFiler = new FileFilter() {

                                public boolean accept(File pathname) {

                                        return pathname.getAbsolutePath().toLowerCase().endsWith(fileExtension);

                                }

                        };

                        Visitor visitor = new Visitor() {

                                public void visit(final Object obj)

                                        throws VisitCanceledException, BaseException {

                                        SwingUtilities.invokeLater(new Runnable() {

                                                public void run() {

                                                        add(obj);

                                                }

                                        });

                                }

                        };

                        if( this.symbolLoader!=null ) {

                                this.symbolLoader.cancelRequest();

                        }

                        this.symbolLoader = MapContextLocator.getSymbolManager().loadSymbols(folder,fileFiler,visitor);

                }

                return elements;

        }

        public int getSize() {

                return getObjects().size();

        }

        public Object getElementAt(int index) {

                return getObjects().get(index);

        }

}