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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) 2005-2008, 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.visitor;

import org.geotools.geometry.jts.ReferencedEnvelope;
import org.locationtech.jts.geom.Envelope;

/**
 * Calculates the extents (envelope) of the features it visits.
 *
 * @author Cory Horner, Refractions
 * @since 2.2.M2
 */
public class BoundsVisitor implements FeatureCalc {
    ReferencedEnvelope bounds = new ReferencedEnvelope();

    public void visit(org.opengis.feature.Feature feature) {
        bounds.include(feature.getBounds());
    }

    public ReferencedEnvelope getBounds() {
        return bounds;
    }

    public void reset(Envelope bounds) {
        this.bounds = new ReferencedEnvelope();
    }

    public CalcResult getResult() {
        if (bounds == null || bounds.isEmpty()) {
            return CalcResult.NULL_RESULT;
        }
        return new BoundsResult(bounds);
    }

    public static class BoundsResult extends AbstractCalcResult {
        private ReferencedEnvelope bbox;

        public BoundsResult(ReferencedEnvelope bbox) {
            this.bbox = bbox;
        }

        public ReferencedEnvelope getValue() {
            return new ReferencedEnvelope(bbox);
        }

        public boolean isCompatible(CalcResult targetResults) {
            // list each calculation result which can merge with this type of result
            if (targetResults instanceof BoundsResult || targetResults == CalcResult.NULL_RESULT) {
                return true;
            }

            return false;
        }

        public CalcResult merge(CalcResult resultsToAdd) {
            if (!isCompatible(resultsToAdd)) {
                throw new IllegalArgumentException("Parameter is not a compatible type");
            }

            if (resultsToAdd == CalcResult.NULL_RESULT) {
                return this;
            }

            if (resultsToAdd instanceof BoundsResult) {
                BoundsResult boundsToAdd = (BoundsResult) resultsToAdd;

                // add one set to the other (to create one big unique list)
                ReferencedEnvelope newBounds = new ReferencedEnvelope(bbox);
                newBounds.include(boundsToAdd.getValue());

                return new BoundsResult(newBounds);
            } else {
                throw new IllegalArgumentException(
                        "The CalcResults claim to be compatible, but the appropriate merge method has not been implemented.");
            }
        }
    }
}