Klasse FileLoader um Textdateien zu laden

src/main/java/schule/ngb/zm/util/FileLoader.java

@@ -0,0 +1,88 @@
+package schule.ngb.zm.util;
+
+import java.io.*;
+import java.net.URISyntaxException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+public final class FileLoader {
+
+	public static final Charset ASCII = StandardCharsets.US_ASCII;
+
+	public static final Charset UTF8 = StandardCharsets.UTF_8;
+
+	public static final Charset UTF16 = StandardCharsets.UTF_16;
+
+	public static final Charset ISO_8859_1 = StandardCharsets.ISO_8859_1;
+
+
+	public static List<String> loadLines( String source ) {
+		return loadLines(source, UTF8);
+	}
+
+	public static List<String> loadLines( String source, Charset charset ) {
+		try {
+			return Files.readAllLines(Paths.get(ResourceStreamProvider.getResourceURL(source).toURI()), charset);
+		} catch( IOException | URISyntaxException ex ) {
+			LOG.warn(ex, "Error while loading lines from source <%s>", source);
+		}
+
+		return Collections.EMPTY_LIST;
+	}
+
+	public static String loadText( String source ) {
+		return loadText(source, UTF8);
+	}
+
+	public static String loadText( String source, Charset charset ) {
+		try {
+			return Files.readString(Paths.get(ResourceStreamProvider.getResourceURL(source).toURI()), charset);
+		} catch( IOException | URISyntaxException ex ) {
+			LOG.warn(ex, "Error while loading text from source <%s>", source);
+		}
+
+		return "";
+	}
+
+	public static double[][] loadDoubles( String source, char separator, boolean skipFirst ) {
+		return loadDoubles(source, separator, skipFirst, UTF8);
+	}
+
+	public static double[][] loadDoubles( String source, char separator, boolean skipFirst, Charset charset ) {
+		try {
+			int n = skipFirst ? 1 : 0;
+			return Files
+				.lines(Paths.get(ResourceStreamProvider.getResourceURL(source).toURI()), charset)
+				.skip(n)
+				.map(
+					(line) -> Arrays
+						.stream(line.split(Character.toString(separator)))
+						.mapToDouble(
+							(value) -> {
+								try {
+									return Double.parseDouble(value);
+								} catch( NumberFormatException nfe ) {
+									return 0.0;
+								}
+							}
+						).toArray()
+				).toArray(double[][]::new);
+		} catch( IOException | URISyntaxException ex ) {
+			LOG.warn(ex, "Error while loading double values from csv source <%s>", source);
+		}
+
+		return new double[0][0];
+	}
+
+	public FileLoader() {
+	}
+
+	private static final Log LOG = Log.getLogger(FileLoader.class);
+
+}

src/main/java/schule/ngb/zm/util/ImageLoader.java

@@ -17,7 +17,7 @@ import java.util.Objects;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.logging.Logger;
 
-public class ImageLoader {
+public final class ImageLoader {
 
 	public static boolean caching = true;