/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2002-2011, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geoserver.data.versioning.decorator;

import java.util.NoSuchElementException;

import org.geogit.api.RevTree;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.feature.FeatureIterator;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.sort.SortBy;

/**
 * FeatureCollectionDecorator that assigns as {@link ResourceId} as each Feature
 * {@link Feature#getIdentifier() identifier} from the {@link ObjectId} of the
 * current state of the Feature.
 * 
 * @author groldan
 */
class SimpleResourceIdAssigningFeatureCollection extends
        ResourceIdAssigningFeatureCollection<SimpleFeatureType, SimpleFeature>
        implements SimpleFeatureCollection {

    public SimpleResourceIdAssigningFeatureCollection(
            SimpleFeatureCollection delegate, FeatureSourceDecorator source,
            RevTree typeTree) {
        super(delegate, source, typeTree);
    }

    /**
     * @see SimpleFeatureCollection#features()
     */
    @Override
    public SimpleFeatureIterator features() {
        return new SimpleResourceIdAssigningFeatureIterator(delegate.features());
    }

    /**
     * @see SimpleFeatureCollection#subCollection(Filter)
     */
    @Override
    public SimpleFeatureCollection subCollection(Filter filter) {
        return (SimpleFeatureCollection) super.subCollection(filter);
    }

    /**
     * @see SimpleFeatureCollection#sort(SortBy)
     */
    @Override
    public SimpleFeatureCollection sort(SortBy order) {
        return (SimpleFeatureCollection) super.sort(order);
    }

    class SimpleResourceIdAssigningFeatureIterator implements
            SimpleFeatureIterator {

        private ResourceIdAssigningFeatureIterator<SimpleFeature> features;

        SimpleResourceIdAssigningFeatureIterator(
                FeatureIterator<SimpleFeature> features) {
            this.features = new ResourceIdAssigningFeatureIterator<SimpleFeature>(
                    features, store, currentTypeTree);
        }

        @Override
        public boolean hasNext() {
            return features.hasNext();
        }

        @Override
        public SimpleFeature next() throws NoSuchElementException {
            return features.next();
        }

        @Override
        public void close() {
            features.close();
        }

    }
}