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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2012, 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.geotools.feature.collection;

import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.store.EmptyFeatureCollection;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.sort.SortBy;

public abstract class BaseSimpleFeatureCollection
        extends BaseFeatureCollection
        implements SimpleFeatureCollection {

    protected BaseSimpleFeatureCollection(SimpleFeatureType schema) {
        super(schema);
    }

    /**
     * Subclasses required to implement this method to traverse FeatureCollection contents.
     *
     * Note that {@link SimpleFeatureIterator#close()} is available to clean up after any
     * resource use required during traversal.
     */
    public abstract SimpleFeatureIterator features();

    public SimpleFeatureCollection subCollection(Filter filter) {
        if (filter == Filter.INCLUDE) {
            return this;
        }
        if (filter == Filter.EXCLUDE) {
            return new EmptyFeatureCollection(schema);
        }
        // Formally new SubFeatureCollection(this, filter);
        return new FilteringSimpleFeatureCollection(this, filter);
    }

    public SimpleFeatureCollection sort(SortBy order) {
        // Formally new SubFeatureList(this, order);
        return new SortedSimpleFeatureCollection(this, new SortBy[] {order});
    }
}