Created the DialogflowHandler. Useful to redirect not found messages to dialogflow

src/main/java/de/gnmyt/autoresponder/handler/DialogflowHandler.java

@@ -0,0 +1,39 @@
+package de.gnmyt.autoresponder.handler;
+
+import de.gnmyt.autoresponder.integration.DialogflowIntegration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DialogflowHandler extends NotFoundHandler {
+
+    private static final Logger LOG = LoggerFactory.getLogger(DialogflowHandler.class);
+
+    private DialogflowIntegration dialogflowIntegration;
+
+    /**
+     * Constructor of the {@link DialogflowHandler}.
+     * <p>
+     * Runs whenever the request could not be found and redirects the message to dialogflow
+     *
+     * @param credentials Your credentials file, created by your google api
+     */
+    public DialogflowHandler(File credentials) {
+        try {
+            this.dialogflowIntegration = new DialogflowIntegration(credentials);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    public List<String> handleRequest(String sender, String message) {
+        ArrayList<String> messages = new ArrayList<>();
+        messages.add(dialogflowIntegration.getMessage(message, sender));
+        return messages;
+    }
+}