Application: gvSIG desktop » gvSIG tools: Catalog

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

* 

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

* MA  02110-1301, USA.

* 

*/

/*

* AUTHORS (In addition to CIT):

* 2009 {Iver T.I.}   {Task}

*/

package org.gvsig.catalog.impl;

import java.lang.reflect.InvocationTargetException;

import java.net.URI;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.TreeMap;

import org.gvsig.catalog.CatalogManager;

import org.gvsig.catalog.drivers.ICatalogServiceDriver;

import org.gvsig.catalog.loaders.LayerLoader;

import org.gvsig.catalog.metadataxml.XMLNode;

import org.gvsig.catalog.schemas.Record;

import org.gvsig.catalog.schemas.Resource;

import org.gvsig.catalog.schemas.UnknownRecord;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.extensionpoint.ExtensionPoint;

import org.gvsig.tools.extensionpoint.ExtensionPointManager;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * @author <a href="mailto:jpiera@gvsig.org">Jorge Piera</a>

 */

public class DefaultCatalogManager implements CatalogManager {

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

        private static final String DRIVER_REGISTER_NAME = "CatalogDrivers";

        private ArrayList records = null; 

        private static TreeMap loadersPool = null;

        public DefaultCatalogManager() {

                super();

                records = new ArrayList();

                loadersPool = new TreeMap();

        }

        /* (non-Javadoc)

         * @see org.gvsig.catalog.CatalogManager#getDriver(java.lang.String)

         */

        public ICatalogServiceDriver getDriver(String protocol) {

                ExtensionPointManager extensionPointManager = ToolsLocator

                .getExtensionPointManager();

                ExtensionPoint extensionPoint = extensionPointManager.add(DRIVER_REGISTER_NAME);

                Iterator extensions = extensionPoint.iterator();

                while (extensions.hasNext()){

                        ExtensionPoint.Extension extension = (ExtensionPoint.Extension)extensions.next();

                        ICatalogServiceDriver driver;

                        try {

                                driver = (ICatalogServiceDriver)extension.create();

                                if (driver.getServiceName().toLowerCase().compareTo(protocol.toLowerCase()) == 0){

                                        return driver;

                                }

                        } catch (InstantiationException e) {

                                logger.error("Impossible to create a catalog driver", e);

                        } catch (IllegalAccessException e) {

                                logger.error("Impossible to create a catalog driver", e);

                        }                        

                }

                return null;

        }

        /* (non-Javadoc)

         * @see org.gvsig.catalog.CatalogManager#getDrivers()

         */

        public ICatalogServiceDriver[] getDrivers() {

                ICatalogServiceDriver[] drivers = null;

                ExtensionPointManager extensionPointManager = ToolsLocator

                .getExtensionPointManager();

                ExtensionPoint extensionPoint = extensionPointManager.add(DRIVER_REGISTER_NAME);

                drivers = new ICatalogServiceDriver[extensionPoint.getCount()];

                Iterator extensions = extensionPoint.iterator();                

                int i = 0;                

                while (extensions.hasNext()){

                        ExtensionPoint.Extension extension = (ExtensionPoint.Extension)extensions.next();

                        ICatalogServiceDriver driver;

                        try {

                                driver = (ICatalogServiceDriver)extension.create();

                                drivers[i] = driver;                                

                        } catch (InstantiationException e) {

                                logger.error("Impossible to create a catalog driver", e);

                        } catch (IllegalAccessException e) {

                                logger.error("Impossible to create a catalog driver", e);

                        }                        

                        i++;

                }

                return drivers;

        }

        /* (non-Javadoc)

         * @see org.gvsig.catalog.CatalogManager#register(java.lang.String, java.lang.Class)

         */

        public void register(String name, Class driver) {

                ExtensionPointManager extensionPointManager = ToolsLocator

                .getExtensionPointManager();

                ExtensionPoint extensionPoint = extensionPointManager.add(DRIVER_REGISTER_NAME);

                extensionPoint.append(name.toLowerCase(), "", driver);

        }

        /* (non-Javadoc)

         * @see org.gvsig.catalog.CatalogManager#addRecord(org.gvsig.catalog.schemas.Record)

         */

        public void addRecord(Record record) {

                records.add(record);                

        }

        /* (non-Javadoc)

         * @see org.gvsig.catalog.CatalogManager#createRecord(java.net.URI, org.gvsig.catalog.metadataxml.XMLNode)

         */

        public Record createRecord(URI uri, XMLNode node) {

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

                        Record record = (Record)records.get(i);

                        if (node != null){

                                if (record.accept(uri, node)){

                                        Object[] values = {uri, node};

                                        Class[] types = {URI.class, XMLNode.class}; 

                                        try {

                                                return (Record)record.getClass().getConstructor(types).newInstance(values);

                                        } catch (Exception e) {

                                                //It the instance can be created the 

                                                //default record has to be returned

                                        } 

                                }        

                        }

                }

                return new UnknownRecord(uri,node);        

        }

        /* (non-Javadoc)

         * @see org.gvsig.catalog.CatalogManager#addLayerLoader(java.lang.String, java.lang.Class)

         */

        public void addLayerLoader(String key, Class loader) {

                loadersPool.put(key, loader);                

        }

        /* (non-Javadoc)

         * @see org.gvsig.catalog.CatalogManager#getLayerLoader(org.gvsig.catalog.schemas.Resource)

         */

        public LayerLoader getLayerLoader(Resource resource)

                        throws IllegalArgumentException, SecurityException,

                        InstantiationException, IllegalAccessException,

                        InvocationTargetException, NoSuchMethodException {

                if (loadersPool.containsKey(resource.getType())) {

                        Class llClass = (Class) loadersPool.get(resource.getType());

                        Class [] args = {Resource.class};

                        Object [] params = {resource};

                        return (LayerLoader) llClass.getConstructor(args).newInstance(params);

                }

                return null;

        }

}