Add helper methods

src/main/java/me/goudham/ClipboardListener.java

@@ -1,17 +1,61 @@
 package me.goudham;
 
+import java.awt.Image;
 import java.awt.Toolkit;
 import java.awt.datatransfer.Clipboard;
+import java.awt.datatransfer.Transferable;
+import java.awt.datatransfer.UnsupportedFlavorException;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import me.goudham.listener.ClipboardEventListener;
 
+import static me.goudham.domain.Contents.IMAGE;
+import static me.goudham.domain.Contents.STRING;
+
 abstract class ClipboardListener {
     final Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
     List<ClipboardEventListener> eventsListener = new ArrayList<>();
     private boolean imagesMonitored = true;
     private boolean textMonitored = true;
 
+    String getStringContent(Transferable clipboardContents) {
+        String newContent = null;
+
+        try {
+            newContent = (String) clipboardContents.getTransferData(STRING.getDataFlavor());
+        } catch (UnsupportedFlavorException | IOException exp) {
+            exp.printStackTrace();
+        }
+
+        return newContent;
+    }
+
+    BufferedImage getImageContent(Transferable clipboardContents) {
+        BufferedImage bufferedImage = null;
+
+        try {
+            bufferedImage = ClipboardUtils.convertToBufferedImage((Image) clipboardContents.getTransferData(IMAGE.getDataFlavor()));
+        } catch (UnsupportedFlavorException | IOException exp) {
+            exp.printStackTrace();
+        }
+
+        return bufferedImage;
+    }
+
+    void notifyStringEvent(String stringContent) {
+        for (ClipboardEventListener clipboardEventListener : eventsListener) {
+            clipboardEventListener.onCopyString(stringContent);
+        }
+    }
+
+    void notifyImageEvent(BufferedImage imageContent) {
+        for (ClipboardEventListener clipboardEventListener : eventsListener) {
+            clipboardEventListener.onCopyImage(imageContent);
+        }
+    }
+
     void addEventListener(ClipboardEventListener clipboardEventListener) {
         if (!eventsListener.contains(clipboardEventListener)) {
             eventsListener.add(clipboardEventListener);