001 package edu.nrao.sss.model.source.sort; 002 003 import edu.nrao.sss.astronomy.CelestialCoordinateSystem; 004 import edu.nrao.sss.astronomy.Epoch; 005 import edu.nrao.sss.astronomy.SkyPosition; 006 import edu.nrao.sss.measure.Latitude; 007 import edu.nrao.sss.model.source.Source; 008 import edu.nrao.sss.sort.SortOrder; 009 010 /** 011 * Sorts {@link Source sources} based on the latitude of the position of 012 * their central subsources. 013 * <p/> 014 * The default values for this key's attributes are: 015 * <ul> 016 * <li>{@link #setOrder(SortOrder) Sort order}: 017 * {@link SortOrder#NATURAL natural}</li> 018 * <li>{@link #setConversionParameters(CelestialCoordinateSystem, Epoch) 019 * Coordinate System}: 020 * {@link CelestialCoordinateSystem#EQUATORIAL}</li> 021 * <li>{@link #setConversionParameters(CelestialCoordinateSystem, Epoch) 022 * Epoch}: {@link Epoch#J2000}.</li> 023 * <li>{@link #turnOffConversion() Perform coordinate system conversion}: 024 * true</li> 025 * <li>{@link #setQueryTime(java.util.Date) Query time}: current time</li> 026 * </ul> 027 * <p> 028 * <b>Version Info:</b> 029 * <table style="margin-left:2em"> 030 * <tr><td>$Revision: 616 $</td></tr> 031 * <tr><td>$Date: 2007-05-16 14:22:53 -0600 (Wed, 16 May 2007) $</td></tr> 032 * <tr><td>$Author: dharland $</td></tr> 033 * </table></p> 034 * 035 * @author David M. Harland 036 * @since 2007-05-08 037 */ 038 public class SourceLatitudeSortKey 039 extends SourceEqArcSortKey<Latitude> 040 { 041 Latitude getArc(SkyPosition position) 042 { 043 return position == null ? null : position.getLatitude(queryTime); 044 } 045 }