Application: gvSIG desktop

package org.gvsig.data.vectorial;

import java.util.ConcurrentModificationException;

import java.util.Iterator;

import org.gvsig.data.vectorial.visitor.FeaturesVisitor;

import org.gvsig.exceptions.BaseException;

import org.gvsig.util.observer.Observable;

public abstract class AbstractFeatureCollection implements FeatureCollection{

        protected boolean modified=false;

        public void update(Observable obsevable, Object notification) {

                if (modified){

                        return;

                }

                String type = ((FeatureStoreNotification)notification).getType();

                if (type.equalsIgnoreCase(FeatureStoreNotification.AFTER_INSERT) ||

                                type.equalsIgnoreCase(FeatureStoreNotification.AFTER_DELETE) ||

                                type.equalsIgnoreCase(FeatureStoreNotification.RESOURCE_CHANGED)){

                        modified=true;

                }

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.data.vectorial.visitor.FeaturesVisitable#accept(org.gvsig.data.vectorial.visitor.FeaturesVisitor)

         */

        public void accept(FeaturesVisitor visitor) throws BaseException {

                Iterator iterator=iterator();

                while (iterator.hasNext()) {

                        Feature feature = (Feature) iterator.next();

                        visitor.visit(feature);

                }

        }

        protected void checkModified() {

                if (modified)

                        throw new ConcurrentModificationException("FeatureCollection modified");

        }

        public boolean isEmpty() {

                checkModified();

                return (size()==0);

        }

        public Feature getFeature(int index) {

                // TODO 

                throw new UnsupportedOperationException();

//                return null;

        }

}