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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 org.opengis.filter.expression.Expression;

/**
 * A symbolizer describes how a feature should appear on a map.
 *
 * The symbolizer describes not just the shape that should appear but also such graphical
 * properties as color and opacity.
 *
 * 
A symbolizer is obtained by specifying one of a small number of different types of symbolizer
 * and then supplying parameters to override its default behaviour.
 *
 * 
The details of this object are taken from the OGC Styled-Layer Descriptor
 * Report (OGC 02-070) version 1.0.0.:
 *
 * 

 * <xsd:element name="LineSymbolizer" substitutionGroup="sld:Symbolizer">
 *   <xsd:annotation>
 *     <xsd:documentation>
 *       A LineSymbolizer is used to render a "stroke" along a linear geometry.
 *     </xsd:documentation>
 *   </xsd:annotation>
 *   <xsd:complexType>
 *     <xsd:complexContent>
 *       <xsd:extension base="sld:SymbolizerType">
 *         <xsd:sequence>
 *           <xsd:element ref="sld:Geometry" minOccurs="0"/>
 *           <xsd:element ref="sld:Stroke" minOccurs="0"/>
 *         </xsd:sequence>
 *       </xsd:extension>
 *     </xsd:complexContent>
 *   </xsd:complexType>
 * </xsd:element>
 * 
 *
 * Renderers can use this information when displaying styled features, though it must be
 * remembered that not all renderers will be able to fully represent strokes as set out by this
 * interface. For example, opacity may not be supported.
 *
 * 
Notes:
 *
 * 

 *   The graphical parameters and their values are derived from SVG/CSS2 standards with names
 *       and semantics which are as close as possible.
 * 
 *
 * @author James Macgill, CCG
 * @version $Id$
 */
public interface LineSymbolizer extends org.opengis.style.LineSymbolizer, Symbolizer {
    /**
     * Provides the graphical-symbolization parameter to use for the linear geometry.
     *
     * @return The Stroke style to use when rendering lines.
     */
    Stroke getStroke();

    /**
     * Provides the graphical-symbolization parameter to use for the linear geometry.
     *
     * @param stroke The Stroke style to use when rendering lines.
     */
    void setStroke(org.opengis.style.Stroke stroke);

    /**
     * Define an offset to draw lines in parallel to the original geometry.
     *
     * @param offset Distance in UOMs to offset line; left-hand side is positive; right-hand side is
     *     negative; the default value is 0
     */
    void setPerpendicularOffset(Expression offset);
}