001/*
002 * Copyright (c) 2015 The Regents of the University of California.
003 * All rights reserved.
004 *
005 * '$Author: crawl $'
006 * '$Date: 2016-08-28 02:21:26 +0000 (Sun, 28 Aug 2016) $' 
007 * '$Revision: 34525 $'
008 * 
009 * Permission is hereby granted, without written agreement and without
010 * license or royalty fees, to use, copy, modify, and distribute this
011 * software and its documentation for any purpose, provided that the above
012 * copyright notice and the following two paragraphs appear in all copies
013 * of this software.
014 *
015 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
016 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
017 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
018 * THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
019 * SUCH DAMAGE.
020 *
021 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
022 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
024 * PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
025 * CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
026 * ENHANCEMENTS, OR MODIFICATIONS.
027 *
028 */
029package org.kepler.gis.util;
030
031import java.util.Collections;
032import java.util.HashMap;
033import java.util.Map;
034
035import org.geotools.referencing.CRS;
036import org.geotools.referencing.crs.DefaultGeographicCRS;
037import org.opengis.referencing.FactoryException;
038import org.opengis.referencing.crs.CoordinateReferenceSystem;
039
040import ptolemy.kernel.util.IllegalActionException;
041
042/** Misc. GIS utilities.
043 * 
044 *  @author Daniel Crawl
045 *  @version $Id: GISUtilities.java 34525 2016-08-28 02:21:26Z crawl $
046 * 
047 */
048public class GISUtilities {
049
050    /** This class cannot be instantiated. */
051    private GISUtilities() {
052    }
053
054    /** Get the EPSG code from a WKT. */
055    public static Integer getEPSGCode(String wktStr) throws IllegalActionException {
056        
057        CoordinateReferenceSystem crs;
058        try {
059             crs = CRS.parseWKT(wktStr);
060        } catch (FactoryException e) {
061            throw new IllegalActionException("Error parsing WKT: " + e.getMessage());
062        }
063                
064        Integer codeVal = _codeCache.get(wktStr);
065        if(codeVal == null) {
066            try {
067                codeVal = CRS.lookupEpsgCode(crs, true);
068                _codeCache.put(wktStr, codeVal);
069            } catch(FactoryException e) {
070                throw new IllegalActionException("Error looking up EPSG code: " + e.getMessage());
071            }
072        }
073        return codeVal;
074    }
075    
076    /** Check if a projection is WGS84 / EPSG 4326. */
077    public static boolean isCRSWGS84(CoordinateReferenceSystem crs) {
078        return CRS.equalsIgnoreMetadata(crs, DefaultGeographicCRS.WGS84) ||
079                crs.getName().toString().equals("EPSG:WGS 84");
080    }
081    
082    /** A cache for the WKT. */
083    private static final Map<String,Integer> _codeCache =
084        Collections.synchronizedMap(new HashMap<String,Integer>());
085
086}