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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 java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.locationtech.jts.geom.Envelope;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.Point;

/**
 * An abstract implementation for CalcResults. Each subclass should implement its own getValue(),
 * merge(), and constructor methods.
 *
 * @author Cory Horner, Refractions
 * @since 2.2.M2
 */
public class AbstractCalcResult implements CalcResult {
    public boolean isCompatible(CalcResult targetResults) {
        return targetResults == CalcResult.NULL_RESULT;
    }

    public CalcResult merge(CalcResult resultsToAdd) {
        if (resultsToAdd == CalcResult.NULL_RESULT) {
            return this;
        } else {
            if (!isCompatible(resultsToAdd)) {
                throw new IllegalArgumentException("Parameter is not a compatible type");
            } else {
                throw new IllegalArgumentException(
                        "The CalcResults claim to be compatible, but the appropriate merge "
                                + "method has not been implemented.");
            }
        }
    }

    public Object getValue() {
        return null;
    }

    public int toInt() {
        Object value = getValue();
        if (value instanceof Number) {
            Number number = (Number) value;
            return number.intValue();
        } else {
            return (int) 0;
        }
    }

    public double toDouble() {
        Object value = getValue();
        if (value instanceof Number) {
            Number number = (Number) value;
            return number.doubleValue();
        } else {
            return (double) 0;
        }
    }

    public long toLong() {
        Object value = getValue();
        if (value instanceof Number) {
            Number number = (Number) value;
            return number.longValue();
        } else {
            return (long) 0;
        }
    }

    public float toFloat() {
        Object value = getValue();
        if (value instanceof Number) {
            Number number = (Number) value;
            return number.floatValue();
        } else {
            return (float) 0;
        }
    }

    public Geometry toGeometry() {
        Object value = getValue();
        if (value instanceof Geometry) return (Geometry) getValue();
        else return null;
    }

    public Envelope toEnvelope() {
        Object value = getValue();
        if (value instanceof Envelope) return (Envelope) value;
        else return null;
    }

    public Point toPoint() {
        Geometry geometry = toGeometry();
        return geometry.getCentroid();
    }

    public Set toSet() {
        Object value = getValue();

        if (value == null) {
            return null;
        }

        if (value instanceof Set) {
            Set set = (Set) value;

            return set;
        }

        if (value.getClass().isArray()) {
            Set set = new HashSet(Arrays.asList((Object[]) value));

            return set;
        }

        if (value instanceof Collection) {
            Set set = new HashSet((Collection) value);

            return set;
        }

        return null;
    }

    public List toList() {
        Object value = getValue();

        if (value == null) {
            return null;
        }

        if (value instanceof List) {
            List list = (List) value;

            return list;
        }

        if (value.getClass().isArray()) {
            return Arrays.asList((Object[]) value);
        }

        if (value instanceof HashSet) {
            Set set = (HashSet) value;
            // Object[] values = set.toArray();
            return Arrays.asList(set.toArray());
            // List list = new ArrayList();
            // for (int i = 0; i < values.length; i++)
            // list.add(values[i]);
            // return list;
        }

        if (value instanceof Collection) {
            return new ArrayList((Collection) value);
        }

        return null;
    }

    public Object[] toArray() {
        List list = toList();

        if (list == null) {
            return null;
        }

        return list.toArray();
    }

    public String[] toStringArray() {
        List list = toList();

        if (list == null) {
            return null;
        }

        String[] strings = new String[list.size()];

        return (String[]) list.toArray(strings);
    }

    public Map toMap() {
        return (Map) getValue();
    }

    public String toString() {
        return getValue().toString();
    }
}