// License: GPL. For details, see LICENSE file.
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.openstreetmap.josm.data.projection.CustomProjection;
import org.openstreetmap.josm.data.projection.ProjectionConfigurationException;
import org.openstreetmap.josm.data.projection.Projections;
import org.openstreetmap.josm.data.projection.Projections.ProjectionDefinition;
import org.openstreetmap.josm.data.projection.proj.Proj;
/**
* Generates the list of projections by combining two sources: The list from the
* proj.4 project and a list maintained by the JOSM team.
*/
public class BuildProjectionDefinitions {
private static final String JOSM_EPSG_FILE = "data_nodist/projection/josm-epsg";
private static final String PROJ4_EPSG_FILE = "data_nodist/projection/epsg";
private static final String OUTPUT_EPSG_FILE = "data/projection/custom-epsg";
private static final Map<String, ProjectionDefinition> epsgProj4 = new LinkedHashMap<>();
private static final Map<String, ProjectionDefinition> epsgJosm = new LinkedHashMap<>();
private static final boolean printStats = false;
// statistics:
private static int noInJosm = 0;
private static int noDeprecated = 0;
private static int noGeocent = 0;
private static int noBaseProjection = 0;
private static final Map<String, Integer> baseProjectionMap = new HashMap<>();
private static int noDatumgrid = 0;
private static int noJosm = 0;
private static int noProj4 = 0;
private static int noOmercNoBounds = 0;
/**
* Program entry point
* @param args command line arguments (not used)
* @throws IOException if any I/O error occurs
*/
public static void main(String[] args) throws IOException {
buildList(args[0]);
}
static void buildList(String baseDir) throws IOException {
List<ProjectionDefinition> pdJosm = Projections.loadProjectionDefinitions(baseDir + File.separator + JOSM_EPSG_FILE);
for (ProjectionDefinition pd : pdJosm) {
epsgJosm.put(pd.code, pd);
}
List<ProjectionDefinition> pdProj4 = Projections.loadProjectionDefinitions(baseDir + File.separator + PROJ4_EPSG_FILE);
for (ProjectionDefinition pd : pdProj4) {
epsgProj4.put(pd.code, pd);
}
try (FileOutputStream output = new FileOutputStream(baseDir + File.separator + OUTPUT_EPSG_FILE);
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(output, StandardCharsets.UTF_8))) {
out.write("## This file is autogenerated, do not edit!\n");
out.write("## Run ant task \"epsg\" to rebuild.\n");
out.write(String.format("## Source files are %s (can be changed) and %s (copied from the proj.4 project).%n",
JOSM_EPSG_FILE, PROJ4_EPSG_FILE));
out.write("##\n");
out.write("## Entries checked and maintained by the JOSM team:\n");
for (ProjectionDefinition pd : epsgJosm.values()) {
write(out, pd);
noJosm++;
}
out.write("## Other supported projections (source: proj.4):\n");
for (ProjectionDefinition pd : epsgProj4.values()) {
if (doInclude(pd, true)) {
write(out, pd);
noProj4++;
}
}
}
if (printStats) {
System.out.println(String.format("loaded %d entries from %s", epsgJosm.size(), JOSM_EPSG_FILE));
System.out.println(String.format("loaded %d entries from %s", epsgProj4.size(), PROJ4_EPSG_FILE));
System.out.println();
System.out.println("some entries from proj.4 have not been included:");
System.out.println(String.format(" * already in the maintained JOSM list: %d entries", noInJosm));
System.out.println(String.format(" * deprecated: %d entries", noDeprecated));
System.out.println(String.format(" * using +proj=geocent, which is 3D (X,Y,Z) and not useful in JOSM: %d entries", noGeocent));
System.out.println(String.format(" * unsupported base projection: %d entries", noBaseProjection));
System.out.println(" in particular: " + baseProjectionMap);
System.out.println(String.format(" * requires data file for datum conversion: %d entries", noDatumgrid));
if (noOmercNoBounds > 0) {
System.out.println(String.format(" * projection is Oblique Mercator (requires bounds), but no bounds specified: %d entries", noOmercNoBounds));
}
System.out.println();
System.out.println(String.format("written %d entries from %s", noJosm, JOSM_EPSG_FILE));
System.out.println(String.format("written %d entries from %s", noProj4, PROJ4_EPSG_FILE));
}
}
static void write(BufferedWriter out, ProjectionDefinition pd) throws IOException {
out.write("# " + pd.name + "\n");
out.write("<"+pd.code.substring("EPSG:".length())+"> "+pd.definition+" <>\n");
}
static boolean doInclude(ProjectionDefinition pd, boolean noIncludeJosm) {
boolean result = true;
if (noIncludeJosm) {
// we already have this projection
if (epsgJosm.containsKey(pd.code)) {
result = false;
noInJosm++;
}
}
// exclude deprecated projections
// EPSG:4296 is also deprecated, but this is not mentioned in the name
if (pd.name.contains("deprecated") || pd.code.equals("EPSG:4296")) {
result = false;
noDeprecated++;
}
Map<String, String> parameters;
try {
parameters = CustomProjection.parseParameterList(pd.definition, true);
} catch (ProjectionConfigurationException ex) {
throw new RuntimeException(pd.code+":"+ex);
}
String proj = parameters.get(CustomProjection.Param.proj.key);
// +proj=geocent is 3D (X,Y,Z) "projection" - this is not useful in
// JOSM as we only deal with 2D maps
if ("geocent".equals(proj)) {
result = false;
noGeocent++;
}
// no support for NAD27 datum, as it requires a conversion database
String datum = parameters.get(CustomProjection.Param.datum.key);
if ("NAD27".equals(datum)) {
result = false;
noDatumgrid++;
}
// requires datum conversion database
if (parameters.containsKey("geoidgrids")) {
result = false;
noDatumgrid++;
}
// exclude entries where we don't support the base projection
Proj bp = Projections.getBaseProjection(proj);
if (result && !"utm".equals(proj) && bp == null) {
result = false;
noBaseProjection++;
if (!"geocent".equals(proj)) {
if (!baseProjectionMap.containsKey(proj)) {
baseProjectionMap.put(proj, 0);
}
baseProjectionMap.put(proj, baseProjectionMap.get(proj)+1);
}
}
if (result && "omerc".equals(proj) && !parameters.containsKey(CustomProjection.Param.bounds.key)) {
result = false;
noOmercNoBounds++;
}
return result;
}
}