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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) 2002-2008, 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.styling;

import javax.measure.Unit;
import javax.measure.quantity.Length;
import org.opengis.filter.expression.Expression;
import org.opengis.style.StyleVisitor;
import org.opengis.util.Cloneable;

/**
 * Provides a representation of a PolygonSymbolizer in an SLD Document. A PolygonSymbolizer defines
 * how a polygon geometry should be rendered.
 *
 * @author James Macgill, CCG
 * @author Johann Sorel (Geomatys)
 * @version $Id$
 */
public class PolygonSymbolizerImpl extends AbstractSymbolizer
        implements PolygonSymbolizer, Cloneable {

    private Expression offset;
    private DisplacementImpl disp;

    private Fill fill = new FillImpl();
    private StrokeImpl stroke = new StrokeImpl();

    /** Creates a new instance of DefaultPolygonStyler */
    protected PolygonSymbolizerImpl() {
        this(null, null, null, null, null, null, null, null);
    }

    protected PolygonSymbolizerImpl(
            Stroke stroke,
            Fill fill,
            Displacement disp,
            Expression offset,
            Unit uom,
            String geom,
            String name,
            Description desc) {
        super(name, desc, geom, uom);
        this.stroke = StrokeImpl.cast(stroke);
        this.fill = fill;
        this.disp = DisplacementImpl.cast(disp);
        this.offset = offset;
    }

    public Expression getPerpendicularOffset() {
        return offset;
    }

    public void setPerpendicularOffset(Expression offset) {
        this.offset = offset;
    }

    public Displacement getDisplacement() {
        return disp;
    }

    public void setDisplacement(org.opengis.style.Displacement displacement) {
        this.disp = DisplacementImpl.cast(displacement);
    }
    /**
     * Provides the graphical-symbolization parameter to use to fill the area of the geometry.
     *
     * @return The Fill style to use when rendering the area.
     */
    public Fill getFill() {
        return fill;
    }

    /**
     * Sets the graphical-symbolization parameter to use to fill the area of the geometry.
     *
     * @param fill The Fill style to use when rendering the area.
     */
    public void setFill(org.opengis.style.Fill fill) {
        if (this.fill == fill) {
            return;
        }
        this.fill = FillImpl.cast(fill);
    }

    /**
     * Provides the graphical-symbolization parameter to use for the outline of the Polygon.
     *
     * @return The Stroke style to use when rendering lines.
     */
    public StrokeImpl getStroke() {
        return stroke;
    }

    /**
     * Sets the graphical-symbolization parameter to use for the outline of the Polygon.
     *
     * @param stroke The Stroke style to use when rendering lines.
     */
    public void setStroke(org.opengis.style.Stroke stroke) {
        if (this.stroke == stroke) {
            return;
        }
        this.stroke = StrokeImpl.cast(stroke);
    }

    /**
     * Accepts a StyleVisitor to perform some operation on this LineSymbolizer.
     *
     * @param visitor The visitor to accept.
     */
    public Object accept(StyleVisitor visitor, Object data) {
        return visitor.visit(this, data);
    }

    public void accept(org.geotools.styling.StyleVisitor visitor) {
        visitor.visit(this);
    }

    /**
     * Creates a deep copy clone. TODO: Need to complete the deep copy, currently only shallow copy.
     *
     * @return The deep copy clone.
     */
    public Object clone() {
        PolygonSymbolizerImpl clone;

        try {
            clone = (PolygonSymbolizerImpl) super.clone();

            if (fill != null) {
                clone.fill = (Fill) ((Cloneable) fill).clone();
            }

            if (stroke != null) {
                clone.stroke = (StrokeImpl) ((Cloneable) stroke).clone();
            }
        } catch (CloneNotSupportedException e) {
            throw new RuntimeException(e); // this should never happen.
        }

        return clone;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ((disp == null) ? 0 : disp.hashCode());
        result = prime * result + ((fill == null) ? 0 : fill.hashCode());
        result = prime * result + ((offset == null) ? 0 : offset.hashCode());
        result = prime * result + ((stroke == null) ? 0 : stroke.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (!super.equals(obj)) return false;
        if (getClass() != obj.getClass()) return false;
        PolygonSymbolizerImpl other = (PolygonSymbolizerImpl) obj;
        if (disp == null) {
            if (other.disp != null) return false;
        } else if (!disp.equals(other.disp)) return false;
        if (fill == null) {
            if (other.fill != null) return false;
        } else if (!fill.equals(other.fill)) return false;
        if (offset == null) {
            if (other.offset != null) return false;
        } else if (!offset.equals(other.offset)) return false;
        if (stroke == null) {
            if (other.stroke != null) return false;
        } else if (!stroke.equals(other.stroke)) return false;
        return true;
    }

    static PolygonSymbolizerImpl cast(org.opengis.style.Symbolizer symbolizer) {
        if (symbolizer == null) {
            return null;
        } else if (symbolizer instanceof PolygonSymbolizerImpl) {
            return (PolygonSymbolizerImpl) symbolizer;
        } else if (symbolizer instanceof org.opengis.style.PolygonSymbolizer) {
            org.opengis.style.PolygonSymbolizer polygonSymbolizer =
                    (org.opengis.style.PolygonSymbolizer) symbolizer;
            PolygonSymbolizerImpl copy = new PolygonSymbolizerImpl();
            copy.setStroke(StrokeImpl.cast(polygonSymbolizer.getStroke()));
            copy.setDescription(polygonSymbolizer.getDescription());
            copy.setDisplacement(polygonSymbolizer.getDisplacement());
            copy.setFill(polygonSymbolizer.getFill());
            copy.setGeometryPropertyName(polygonSymbolizer.getGeometryPropertyName());
            copy.setName(polygonSymbolizer.getName());
            copy.setPerpendicularOffset(polygonSymbolizer.getPerpendicularOffset());
            copy.setUnitOfMeasure(polygonSymbolizer.getUnitOfMeasure());
            return copy;
        } else {
            return null; // not possible
        }
    }
}