Add handler for only new files parameter

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/LastExecutionHandler.java

@@ -0,0 +1,61 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.impl;
+
+import at.pcgamingfreaks.yaml.YAML;
+import at.pcgamingfreaks.yaml.YamlInvalidContentException;
+import at.pcgamingfreaks.yaml.YamlKeyNotFoundException;
+import lombok.extern.slf4j.Slf4j;
+
+import java.io.File;
+import java.io.IOException;
+import java.time.Instant;
+import java.util.Date;
+
+@Slf4j
+public class LastExecutionHandler {
+    private final File file;
+    private YAML lastFileExecution;
+
+    public LastExecutionHandler(String path) {
+        file = new File(path);
+        try {
+            lastFileExecution = loadLastFileExecution(file);
+        } catch (YamlInvalidContentException | IOException e) {
+            log.warn("Couldn't find or read {}", path, e);
+        }
+    }
+
+    public YAML loadLastFileExecution(File file) throws YamlInvalidContentException, IOException {
+        if (file.exists() && file.isFile()) {
+            return new YAML(file);
+        }
+        return new YAML("");
+    }
+
+    public Date get(String path) {
+        if (!lastFileExecution.isSet(path)) return null;
+        try {
+            return Date.from(Instant.parse(lastFileExecution.getString(path)));
+        } catch (YamlKeyNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void update(String path) {
+        update(path, Date.from(Instant.now()));
+    }
+
+    public void update(String path, Date execution) {
+        if (lastFileExecution == null) return;
+        lastFileExecution.set(path, execution.toInstant());
+    }
+
+    public void persist() {
+        try {
+            lastFileExecution.save(file);
+        } catch (IOException e) {
+            log.warn("", e);
+        }
+    }
+}
+
+