feat: Add proj.db to resource and copy it every time to the location …

…from env variable `PROJ_DATA`

.gitattributes

@@ -1,3 +1,4 @@
 *.jar filter=lfs diff=lfs merge=lfs -text
 src/main/resources/native/linux-x86-64/* filter=lfs diff=lfs merge=lfs -text
 *.gpkg filter=lfs diff=lfs merge=lfs -text
+*.db filter=lfs diff=lfs merge=lfs -text

README.md

@@ -1,5 +1,7 @@
 gdal-jni-with-native
 ======
+[<img src="https://jitpack.io/v/REASY/gdal-jni-with-native.svg">](https://jitpack.io/#REASY/gdal-jni-with-native)
+
 This project builds GDAL, extract native libraries and makes it available as Java library. At the moment it only supports GDAL on Ubuntu x64  (Linux)
 
 ### Build
@@ -14,3 +16,6 @@ All of this is done in a script [generate_native_modules.sh](scripts/generate_na
 ```bash
 ./scripts/generate_native_modules.sh
 ```
+
+### Note on the usage
+Please, make sure that you set an environment variable PROJ_DATA to writable (preferably temporary) folder, for example `/tmp/gdal-jni-with-native/proj/`. That env variable is expected by PROJ, so it cannot be set on runtime by the same process.

build.gradle

@@ -1,5 +1,5 @@
 group = 'gdal-jni-with-native'
-version = '3.5.3.1'
+version = '3.5.3.2'
 
 buildscript {
     repositories {

docker/extract_native.sh

@@ -53,3 +53,6 @@ do
   echo $lib >> $path_native_modules_to_load
 done
 
+# Copy proj.db
+cp /usr/local/share/proj/proj.db "${copy_path}/proj"
+echo "/usr/local/share/proj/proj.db to ${copy_path}/proj"

scripts/generate_native_modules.sh

@@ -33,5 +33,8 @@ docker run -u $(id -u):$(id -g) \
   -v $(pwd)/src/main/resources/:/resources qartez-engine/lddtopo:"$GDAL_VERSION" /usr/share/java/libgdalalljni.so /resources
 
 # Build and test GDAL native library
-./gradlew build && java -cp build/libs/gdal-jni-with-native-3.5.3.0.jar com.github.reasy.gdal.GdalExample
+lib_name=$(./gradlew properties | grep ^name | sed 's/name: //g')
+lib_version=$(./gradlew properties | grep ^version | sed 's/version: //g')
+lib_full_name="$lib_name-$lib_version.jar"
+./gradlew clean build && PROJ_DATA=/tmp/gdal-jni-with-native/proj/ java -cp "build/libs/$lib_full_name" com.github.reasy.gdal.GdalExample
 

src/main/java/com/github/reasy/gdal/GdalExample.java

@@ -49,6 +49,7 @@ private static void writeCogGeoTiff() throws IOException {
         Dataset memDs = drv.Create("", xSize, ySize, 1, type);
         System.out.printf("Created %d x %d dataset with 1 band and type %d\n", xSize, ySize, type);
 
+        memDs.SetProjection("EPSG:32611");
         memDs.GetRasterBand(1).WriteRaster(0, 0, xSize, ySize, data);
         memDs.BuildOverviews("NEAREST", new int[]{2, 4, 8, 16, 32});
 

src/main/java/com/github/reasy/gdal/JNIGdalLoader.java

@@ -7,27 +7,39 @@
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 
 public class JNIGdalLoader {
     public static final String[] MODULES_TO_LOAD;
-
     public static final boolean IS_LOADED;
-
     public static final String PATH_TO_MODULES = String.format("native/%s.txt", Platform.RESOURCE_PREFIX);
+    public static final String PROJ_DB_PATH = "proj/proj.db";
+    public static final String TEMP_PATH_FOR_PROJ_DATA;
 
     static {
+        if (System.getenv("PROJ_DATA") == null) {
+            throw new IllegalStateException("There must be an env variable `PROJ_DATA` set to writable (preferably temporary) folder, for example `/tmp/gdal-jni-with-native/proj/`");
+        }
+        TEMP_PATH_FOR_PROJ_DATA = System.getenv("PROJ_DATA");
+
         try {
-            MODULES_TO_LOAD = GetModules();
-            System.out.printf("JNIGdalLoader java: loading %d shared library...\n", MODULES_TO_LOAD.length);
+            MODULES_TO_LOAD = getModules();
+            System.out.printf("JNIGdalLoader: loading %d shared library...\n", MODULES_TO_LOAD.length);
 
             NativeLibraryLoader loader = new NativeLibraryLoader("/native");
             for (String module : MODULES_TO_LOAD) {
                 loader.load(module);
             }
-            System.out.println("JNIGdalLoader java: loaded all shared libraries");
+            System.out.println("JNIGdalLoader: loaded all shared libraries");
+
+            copyProjDb();
+
             IS_LOADED = true;
         } catch (Exception ex) {
             System.out.println(ex.getMessage());
@@ -37,17 +49,18 @@ public class JNIGdalLoader {
         }
     }
 
+
     public static void load() {
         // Just make sure it that it is loaded.
         // If we reach here, it must always be true (because otherwise the RuntimeException should have been thrown before in static ctor)
         assert IS_LOADED;
     }
 
-    static String[] GetModules() throws IOException {
+    private static String[] getModules() throws IOException {
         List<String> modules = new ArrayList<>();
-        try (InputStream inputStream = JNIGdalLoader.class.getClassLoader().getResourceAsStream(PATH_TO_MODULES)) {
-            Objects.requireNonNull(inputStream, String.format("Resource as stream for '%s' is null", PATH_TO_MODULES));
-            try (InputStreamReader streamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
+        try (InputStream in = JNIGdalLoader.class.getClassLoader().getResourceAsStream(PATH_TO_MODULES)) {
+            Objects.requireNonNull(in, String.format("Resource as stream for '%s' is null", PATH_TO_MODULES));
+            try (InputStreamReader streamReader = new InputStreamReader(in, StandardCharsets.UTF_8);
                  BufferedReader reader = new BufferedReader(streamReader)) {
                 String line;
                 while ((line = reader.readLine()) != null) {
@@ -58,4 +71,14 @@ static String[] GetModules() throws IOException {
         return modules.toArray(new String[0]);
     }
 
+    private static void copyProjDb() throws IOException {
+        try (InputStream in = NativeLibraryLoader.class.getResourceAsStream("/" + PROJ_DB_PATH)) {
+            Objects.requireNonNull(in, String.format("Resource as stream for '%s' is null", PROJ_DB_PATH));
+            Files.createDirectories(Paths.get(TEMP_PATH_FOR_PROJ_DATA));
+            String destPath = TEMP_PATH_FOR_PROJ_DATA + "/proj.db";
+            Files.copy(in, Paths.get(destPath), StandardCopyOption.REPLACE_EXISTING);
+            System.out.printf("JNIGdalLoader java: Copied resource at %s to %s\n", PROJ_DB_PATH, destPath);
+        }
+    }
+
 }