1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.projection.datum;
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3 |
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4 | import java.io.File;
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5 | import java.io.FileInputStream;
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6 | import java.io.FileNotFoundException;
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7 | import java.io.InputStream;
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8 | import java.util.Arrays;
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9 | import java.util.Collections;
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10 | import java.util.List;
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11 |
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12 | import org.openstreetmap.josm.tools.Logging;
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13 | import org.openstreetmap.josm.tools.Platform;
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14 | import org.openstreetmap.josm.tools.PlatformVisitor;
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15 |
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16 | /**
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17 | * Shift file source that scans the common data directories of the proj4 library.
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18 | * @since 12777
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19 | */
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20 | public final class NTV2Proj4DirGridShiftFileSource implements NTV2GridShiftFileSource, PlatformVisitor<List<File>> {
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21 |
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22 | private NTV2Proj4DirGridShiftFileSource() {
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23 | // hide constructor
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24 | }
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25 |
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26 | // lazy initialization
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27 | private static class InstanceHolder {
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28 | static final NTV2Proj4DirGridShiftFileSource INSTANCE = new NTV2Proj4DirGridShiftFileSource();
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29 | }
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30 |
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31 | /**
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32 | * Get the singleton instance of this class.
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33 | * @return the singleton instance of this class
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34 | */
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35 | public static NTV2Proj4DirGridShiftFileSource getInstance() {
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36 | return InstanceHolder.INSTANCE;
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37 | }
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38 |
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39 | @Override
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40 | public InputStream getNTV2GridShiftFile(String gridFileName) {
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41 | File grid = null;
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42 | // Check is the grid is installed in default PROJ.4 directories
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43 | for (File dir : Platform.determinePlatform().accept(this)) {
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44 | File file = new File(dir, gridFileName);
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45 | if (file.exists() && file.isFile()) {
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46 | grid = file;
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47 | break;
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48 | }
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49 | }
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50 | // If not, search into PROJ_LIB directory
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51 | if (grid == null) {
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52 | String projLib = System.getProperty("PROJ_LIB");
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53 | if (projLib != null && !projLib.isEmpty()) {
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54 | File dir = new File(projLib);
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55 | if (dir.exists() && dir.isDirectory()) {
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56 | File file = new File(dir, gridFileName);
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57 | if (file.exists() && file.isFile()) {
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58 | grid = file;
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59 | }
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60 | }
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61 | }
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62 | }
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63 | if (grid != null) {
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64 | try {
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65 | return new FileInputStream(grid.getAbsoluteFile());
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66 | } catch (FileNotFoundException ex) {
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67 | Logging.warn("NTV2 grid shift file not found: " + grid);
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68 | }
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69 | }
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70 | return null;
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71 | }
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72 |
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73 | @Override
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74 | public List<File> visitUnixoid() {
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75 | return Arrays.asList(new File("/usr/local/share/proj"), new File("/usr/share/proj"));
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76 | }
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77 |
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78 | @Override
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79 | public List<File> visitWindows() {
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80 | return Arrays.asList(new File("C:\\PROJ\\NAD"));
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81 | }
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82 |
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83 | @Override
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84 | public List<File> visitOsx() {
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85 | return Collections.emptyList();
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86 | }
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87 | }
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