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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.geotools.filter.ConstantExpression;

/**
 * OverlapBehavior tells a system how to behave when multiple raster images in a layer overlap each
 * other, for example with satellite-image scenes.
 *
 * 
 *
 * 
 *         
 *  <xsd:element name="OverlapBehavior">
 *      <xsd:annotation>
 *          <xsd:documentation>         "OverlapBehavior" tells a
 *              system how to behave when multiple         raster images in
 *              a layer overlap each other, for example with
 *              satellite-image scenes.       </xsd:documentation>
 *      </xsd:annotation>
 *      <xsd:complexType>
 *          <xsd:choice>
 *              <xsd:element ref="sld:LATEST_ON_TOP"/>
 *              <xsd:element ref="sld:EARLIEST_ON_TOP"/>
 *              <xsd:element ref="sld:AVERAGE"/>
 *              <xsd:element ref="sld:RANDOM"/>
 *          </xsd:choice>
 *      </xsd:complexType>
 *  </xsd:element>
 *
 *          
 *         
 *
 * @author Justin Deoliveira, The Open Planning Project
 */
public class OverlapBehavior extends ConstantExpression {
    public static final String AVERAGE_RESCTRICTION = "AVERAGE";
    public static final String RANDOM_RESCTRICTION = "RANDOM";
    public static final String LATEST_ON_TOP_RESCTRICTION = "LATEST_ON_TOP";
    public static final String EARLIEST_ON_TOP_RESCTRICTION = "EARLIEST_ON_TOP";
    public static final String UNSPECIFIED_RESCTRICTION = "UNSPECIFIED";

    public static final OverlapBehavior LATEST_ON_TOP =
            new OverlapBehavior(OverlapBehavior.LATEST_ON_TOP_RESCTRICTION);
    public static final OverlapBehavior EARLIEST_ON_TOP =
            new OverlapBehavior(OverlapBehavior.EARLIEST_ON_TOP_RESCTRICTION);
    public static final OverlapBehavior AVERAGE =
            new OverlapBehavior(OverlapBehavior.AVERAGE_RESCTRICTION);
    public static final OverlapBehavior RANDOM =
            new OverlapBehavior(OverlapBehavior.RANDOM_RESCTRICTION);

    private OverlapBehavior(String value) {
        super(value);
    }

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