First shot a DirectoryTableResolver.java

src/main/java/org/liblouis/DirectoryTableResolver.java

@@ -0,0 +1,63 @@
+package org.liblouis;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.file.FileSystemNotFoundException;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.nio.file.attribute.BasicFileAttributeView;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.HashSet;
+import java.util.Set;
+
+/** A simple table resolver that resolves tables in one specific local directory. */
+public class DirectoryTableResolver implements TableResolver {
+
+	private Path dir; 
+
+	public DirectoryTableResolver(Path dir) {
+		BasicFileAttributes a; 
+		try {
+			a = Files.getFileAttributeView(dir, BasicFileAttributeView.class).readAttributes(); 
+		} catch (NoSuchFileException e) {
+			throw new RuntimeException("directory does not exist: "+dir); 
+		}		catch (FileSystemNotFoundException e) { 
+			throw new RuntimeException(e); 
+		}		catch (IOException e) {
+			throw new RuntimeException(e); 
+		}
+		if (!a.isDirectory())
+			throw new RuntimeException("Not a directory: "+dir);		
+		this.dir = dir;
+	} 
+
+	@Override
+	public URL resolve(String table, URL base) {
+		try {
+			return dir.resolve(table).toFile().toURI().toURL();
+		} catch (MalformedURLException e) {
+			return null; 
+		}
+	}
+
+	@Override
+	public Set<String> list() {
+		File[] files = dir.toFile().listFiles(new FileFilter() { //NOSONAR
+			@Override
+			public boolean accept(File file) {
+				return file.isFile(); 
+			}
+		});
+
+		Set<String> result = new HashSet<>();
+		for (File it : files) {
+			result.add(it.getName());
+		}
+		return result; 
+	}
+
+}