Allow to set served path for NioWebDavServer by system property

main/jackrabbit-filesystem-adapter/src/test/java/org/cryptomator/webdav/jackrabbitservlet/NioWebDavServer.java

@@ -11,16 +11,20 @@ package org.cryptomator.webdav.jackrabbitservlet;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.io.UncheckedIOException;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.Optional;
 
 import org.cryptomator.filesystem.FileSystem;
 import org.cryptomator.filesystem.nio.NioFileSystem;
 
 public class NioWebDavServer {
 
+	private static final String PATH_TO_SERVE_PROPERTY = "pathToServe";
+
 	public static void main(String[] args) throws Exception {
 		FileSystem fileSystem = setupFilesystem();
 		FileSystemBasedWebDavServer server = new FileSystemBasedWebDavServer(fileSystem);
@@ -31,14 +35,36 @@ public class NioWebDavServer {
 		server.stop();
 	}
 
-	private static FileSystem setupFilesystem() throws IOException {
-		BufferedReader in = new BufferedReader(new InputStreamReader(System.in, Charset.defaultCharset()));
-		System.out.print("Enter absolute path to serve (must be an existing directory): ");
-		Path path = Paths.get(in.readLine());
+	private static FileSystem setupFilesystem() {
+		return NioFileSystem.rootedAt(pathToServe());
+	}
+
+	private static Path pathToServe() {
+		Path path = pathFromSystemProperty().orElseGet(NioWebDavServer::pathEnteredByUser);
 		if (!Files.isDirectory(path)) {
 			throw new RuntimeException("Path is not a directory");
 		}
-		return NioFileSystem.rootedAt(path);
+		System.out.println("Serving " + path);
+		return path;
+	}
+
+	private static Optional<Path> pathFromSystemProperty() {
+		String value = System.getProperty(PATH_TO_SERVE_PROPERTY);
+		if (value == null) {
+			return Optional.empty();
+		} else {
+			return Optional.of(Paths.get(value));
+		}
+	}
+
+	private static Path pathEnteredByUser() {
+		BufferedReader in = new BufferedReader(new InputStreamReader(System.in, Charset.defaultCharset()));
+		System.out.print("Enter absolute path to serve (must be an existing directory): ");
+		try {
+			return Paths.get(in.readLine());
+		} catch (IOException e) {
+			throw new UncheckedIOException(e);
+		}
 	}
 
 }