Application: gvSIG desktop

package org.gvsig.data;

import java.security.KeyException;

import java.util.HashMap;

import java.util.Map;

import org.gvsig.util.observer.Observable;

import org.gvsig.util.observer.IObservable;

import org.gvsig.util.observer.IObserver;

public class ResourceManager implements IObservable{

        private static ResourceManager resourceManager = null;

        private Map resources = new HashMap();

        private Observable observers = new Observable();

        public static ResourceManager getResourceManager() {

                if( resourceManager == null ) {

                        resourceManager = new ResourceManager();

                }

                return resourceManager;

        }

        public synchronized Resource addResource(Resource resource) {

                // 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 {

                remove(resource.getKey());

        }

        public synchronized void remove(String key) throws KeyException {

                // Decrementa las referencias y lo elimina

                // si esta a 0 lo elimina.

        }

        public Resource getResource(String key){

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

        }

        /* (non-Javadoc)

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

         */

        public void addObserver(IObserver o) {

                this.observers.addObserver(o);

        }

        /* (non-Javadoc)

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

         */

        public void deleteObserver(IObserver o) {

                this.observers.deleteObserver(o);

        }

        /* (non-Javadoc)

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

         */

        public void deleteObservers() {

                this.observers.deleteObservers();

        }

}