| gvSIG desktop 1

package org.gvsig.fmap.data;

import java.security.KeyException;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import org.gvsig.tools.observer.DefaultObservable;

import org.gvsig.tools.observer.Observable;

import org.gvsig.tools.observer.Observer;

public class ResourceManager implements Observable{

        private static ResourceManager resourceManager = null;

        private Map resources = new HashMap();

        private DefaultObservable observers = new DefaultObservable();

        public static ResourceManager getResourceManager() {

                if( resourceManager == null ) {

                        resourceManager = new ResourceManager();

                }

                return resourceManager;

        }

        public synchronized Resource addResource(Resource resource) throws DataException {

                // Busca si el recurso no esta y de

                // ser asi lo añade.

                // En todo caso incrementa las referencias.

                Resource res = (Resource)this.resources.get(resource.getKey());

                if (res == null){

                        res = resource;

                        this.resources.put(res.getKey(), res);

                        res.addObservers(this.observers);

                        res.preapare();

                }

                res.incref();

                return res;

        }

        public synchronized void remove(Resource resource) throws KeyException, DataException {

                remove(resource.getKey());

        }

        public synchronized void remove(String key) throws KeyException, DataException {

                Resource res = (Resource)this.resources.get(key);

                if (res == null){

                        throw new KeyException(key);

                }

                res.unref();

                if (res.getRefencesCount() < 1){

                        this.resources.remove(key);

                        res.dispose();

                }

                res = null;

        }

        public Resource getResource(String key){

                return (Resource)this.resources.get(key);

        }

        public Iterator iterator(){

                return this.resources.values().iterator();

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.data.IObservable#addObserver(org.gvsig.fmap.data.IObserver)

         */

        public void addObserver(Observer o) {

                this.observers.addObserver(o);

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.data.IObservable#deleteObserver(org.gvsig.fmap.data.IObserver)

         */

        public void deleteObserver(Observer o) {

                this.observers.deleteObserver(o);

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.data.IObservable#deleteObservers()

         */

        public void deleteObservers() {

                this.observers.deleteObservers();

        }

}