feat: extend shapefile writer to create .cpg file

Create .cpg file/files when one/more .shp files are created.
The .cpg file contain only the encoding used to write the shapefile.
Create test for creating .cpg file

io/plugins/eu.esdihumboldt.hale.io.shp.test/src/eu/esdihumboldt/hale/io/shp/ShapefileInstanceWriterTest.groovy

@@ -100,7 +100,7 @@ class ShapefileInstanceWriterTest {
 		String filenameOnly = Paths.get(location).getFileName().toString();
 
 		filenameOnly = filenameOnly.substring(0, filenameOnly.lastIndexOf("."));
-		String filename = filePath + "/" + filenameOnly + "_" + additionalName + ".shp";
+		String filename = filePath + "/" + filenameOnly + "_" + additionalName + ShapefileConstants.SHP_EXTENSION;
 		file = new File(filename)
 		Schema schema = loadSchema(file)
 
@@ -117,6 +117,19 @@ class ShapefileInstanceWriterTest {
 		return reader.getInstances();
 	}
 
+	@Test
+	public void whenReadWithBufferedReader_thenCorrect()
+	throws IOException {
+		String expected_value = "UTF-8";
+		String file ="src/test/resources/fileTest.txt";
+
+		BufferedReader reader = new BufferedReader(new FileReader(file));
+		String currentLine = reader.readLine();
+		reader.close();
+
+		assertEquals(expected_value, currentLine);
+	}
+
 
 	/**
 	 * Write an instance collection to a Shapefile.
@@ -1443,4 +1456,24 @@ class ShapefileInstanceWriterTest {
 			assertEquals(2, num)
 		}
 	}
+
+	@Test
+	void testCPGFileCreation() {
+		def tmpDir = Files.createTempDirectory("CPGFileTest")
+		def tmpFile = Files.createTempFile(tmpDir, 'new', '.cpg')
+
+		try {
+			ShapefileInstanceWriter writer = new ShapefileInstanceWriter();
+			writer.writeCodePageFile(tmpFile.toFile().getAbsolutePath());
+			assertTrue(tmpFile.toFile().exists());
+
+			String expected_value = writer.getCharset().toString();
+			BufferedReader bufferedReader = new BufferedReader(new FileReader(tmpFile.toFile().getAbsolutePath()));
+			String currentLine = bufferedReader.readLine();
+			bufferedReader.close();
+			assertEquals(expected_value, currentLine);
+		} finally {
+			tmpDir.deleteDir()
+		}
+	}
 }

io/plugins/eu.esdihumboldt.hale.io.shp/src/eu/esdihumboldt/hale/io/shp/ShapefileConstants.java

@@ -81,6 +81,12 @@ public interface ShapefileConstants {
 	 * Constant for the shape file extension.
 	 */
 	public static final String SHP_EXTENSION = ".shp";
+
+	/**
+	 * Constant for the CPG file extension.
+	 */
+	public static final String CPG_EXTENSION = ".cpg";
+
 	/**
 	 * Constant for underscore.
 	 */

io/plugins/eu.esdihumboldt.hale.io.shp/src/eu/esdihumboldt/hale/io/shp/writer/ShapefileInstanceWriter.java

@@ -16,6 +16,7 @@
 package eu.esdihumboldt.hale.io.shp.writer;
 
 import java.io.File;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.io.Serializable;
 import java.net.URI;
@@ -122,6 +123,11 @@ protected IOReport execute(ProgressIndicator progress, IOReporter reporter)
 				setTarget(new MultiLocationOutputSupplier(uris));
 			}
 
+			for (String f : filesWritten) {
+				String cpgFileName = filePath + "/" + f + ShapefileConstants.CPG_EXTENSION;
+				writeCodePageFile(cpgFileName);
+			}
+
 			reporter.setSuccess(true);
 		} catch (Exception e) {
 			reporter.error(new IOMessageImpl(e.getMessage(), e));
@@ -724,4 +730,29 @@ private List<String> writeToFile(
 		return filesWritten;
 	}
 
+	/**
+	 * 
+	 * @param filePath Path of the file to be written with just one line of the
+	 *            encoding
+	 * @throws IOException exception in any.
+	 */
+	public void writeCodePageFile(String filePath) throws IOException {
+		File file = new File(filePath);
+		FileWriter fileWriter = new FileWriter(file);
+		try {
+			fileWriter.write(getCharset() != null ? getCharset().toString()
+					: getDefaultCharset().toString());
+		} catch (IOException e) {
+			throw new IOException("An error occurred while creating/writing the CPG file: "
+					+ filePath + " " + e.getMessage());
+		} finally {
+			try {
+				fileWriter.close();
+			} catch (IOException e) {
+				throw new IOException("An error occurred while trying to close the CPG file: "
+						+ filePath + " " + e.getMessage());
+			}
+		}
+	}
+
 }