    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/graphics/displayelements/AbstractDisplayElement.java $
    002    /*----------------------------------------------------------------------------
    003     This file is part of deegree, http://deegree.org/
    004     Copyright (C) 2001-2009 by:
    005       Department of Geography, University of Bonn
    006     and
    007       lat/lon GmbH
    008
    009     This library is free software; you can redistribute it and/or modify it under
    010     the terms of the GNU Lesser General Public License as published by the Free
    011     Software Foundation; either version 2.1 of the License, or (at your option)
    012     any later version.
    013     This library is distributed in the hope that it will be useful, but WITHOUT
    014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
    016     details.
    017     You should have received a copy of the GNU Lesser General Public License
    018     along with this library; if not, write to the Free Software Foundation, Inc.,
    019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    020
    021     Contact information:
    022
    023     lat/lon GmbH
    024     Aennchenstr. 19, 53177 Bonn
    025     Germany
    026     http://lat-lon.de/
    027
    028     Department of Geography, University of Bonn
    029     Prof. Dr. Klaus Greve
    030     Postfach 1147, 53001 Bonn
    031     Germany
    032     http://www.geographie.uni-bonn.de/deegree/
    033
    034     e-mail: info@deegree.org
    035    ----------------------------------------------------------------------------*/
    036    package org.deegree.graphics.displayelements;
    037
    038    import java.io.Serializable;
    039
    040    import org.deegree.model.feature.Feature;
    041
    042    /**
    043     * Base class for all display elements.
    044     * <p>
    045     * A <code>DisplayElement</code> is associated to one feature that may have a geometry property or not (this is the
    046     * common case).
    047     *
    048     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
    049     * @author <a href="mailto:mschneider@lat-lon.de">Markus Schneider</a>
    050     * @author last edited by: $Author: mschneider $
    051     *
    052     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
    053     */
    054    abstract class AbstractDisplayElement implements DisplayElement, Serializable {
    055
    056        /** Use serialVersionUID for interoperability. */
    057        private final static long serialVersionUID = 1226236249388451855L;
    058
    059        /**
    060         * The feature to display
    061         */
    062        protected Feature feature;
    063
    064        private boolean highlighted;
    065
    066        private boolean selected;
    067
    068        /**
    069         * An empty constructor doing nothing
    070         */
    071        AbstractDisplayElement() {
    072            // nothing
    073        }
    074
    075        /**
    076         *
    077         *
    078         * @param feature
    079         */
    080        AbstractDisplayElement( Feature feature ) {
    081            if ( feature != null ) {
    082                setFeature( feature );
    083            }
    084        }
    085
    086        /**
    087         * Returns the associated <tt>Feature</tt>.
    088         *
    089         */
    090        public Feature getFeature() {
    091            return feature;
    092        }
    093
    094        /**
    095         * sets the feature encapsulated by a DisplayElement
    096         *
    097         * @param feature
    098         */
    099        public void setFeature( Feature feature ) {
    100            this.feature = new ScaledFeature( feature, -1 );
    101        }
    102
    103        /**
    104         * returns the id of the feature that's associated with the DisplayElement
    105         */
    106        public String getAssociateFeatureId() {
    107            return feature.getId();
    108        }
    109
    110        /**
    111         * marks a <tt>DisplayElement</tt> as selected or not
    112         *
    113         */
    114        public void setSelected( boolean selected ) {
    115            this.selected = selected;
    116        }
    117
    118        /**
    119         * returns if the <tt>DisplayElement</tt> is selected or not
    120         *
    121         */
    122        public boolean isSelected() {
    123            return selected;
    124        }
    125
    126        /**
    127         * marks the <tt>DisplayElement</tt> as highlighted or not
    128         *
    129         */
    130        public void setHighlighted( boolean highlighted ) {
    131            this.highlighted = highlighted;
    132        }
    133
    134        /**
    135         * returns if the <tt>DisplayElement</tt> is highlighted or not.
    136         *
    137         */
    138        public boolean isHighlighted() {
    139            return highlighted;
    140        }
    141
    142        /**
    143         * Returns whether the <code>DisplayElement</code> should be painted at the current scale or not.
    144         */
    145        public abstract boolean doesScaleConstraintApply( double scale );
    146    }