Base api works

src/main/java/tk/draganczuk/url/UrlFile.java

@@ -0,0 +1,60 @@
+package tk.draganczuk.url;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.util.List;
+import java.util.Optional;
+
+import org.eclipse.jetty.util.log.Log;
+
+
+public class UrlFile {
+
+	private File file;
+
+	public UrlFile() throws IOException{
+		String path = System.getProperty("file.location", "./urls.csv");
+		this.file = new File(path);
+		if(! file.exists()){
+			file.createNewFile();
+		}
+	}
+
+	public List<String> getAll() throws IOException{
+		return Files.readAllLines(file.toPath());
+	}
+
+	public String addUrl(String longURL, String shortUrl){
+		String entry = String.format("%s,%s",shortUrl,longURL);
+		try {
+			var lineOpt = Files.lines(file.toPath())
+				.filter(line -> line.equals(entry))
+				.findAny();
+			if(lineOpt.isEmpty()){
+				Files.writeString(file.toPath(), entry + System.lineSeparator(), StandardOpenOption.APPEND);
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		return entry;
+	}
+
+	public Optional<String> findForShortUrl(String shortUrl){
+		try {
+			return  Files.lines(file.toPath())
+				.map(this::splitLine)
+				.filter(pair -> pair.getLeft().equals(shortUrl))
+				.map(Pair::getRight)
+				.findAny();
+		} catch (IOException e) {
+			return Optional.empty();
+		}
+	}
+
+	public Pair<String, String> splitLine(String line){
+		var split = line.split(",");
+		return new Pair<>(split[0], split[1]);
+	}
+}