Add separate events for different types

src/main/java/me/goudham/event/FileEvent.java

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+package me.goudham.event;
+
+import java.io.File;
+import java.util.List;
+import me.goudham.domain.OldClipboardContent;
+
+public interface FileEvent extends ClipboardEvent  {
+    void onCopyFiles(OldClipboardContent oldContent, List<File> newContent);
+}

src/main/java/me/goudham/event/ImageEvent.java

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+package me.goudham.event;
+
+import java.awt.image.BufferedImage;
+import me.goudham.domain.OldClipboardContent;
+
+public interface ImageEvent extends ClipboardEvent  {
+    void onCopyImage(OldClipboardContent oldContent, BufferedImage newContent);
+}

src/main/java/me/goudham/event/TextEvent.java

@@ -0,0 +1,7 @@
+package me.goudham.event;
+
+import me.goudham.domain.OldClipboardContent;
+
+public interface TextEvent extends ClipboardEvent  {
+    void onCopyText(OldClipboardContent oldContent, String newContent);
+}