Restructure classes to ensure classes are not unnecessarily public

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

@@ -3,8 +3,12 @@ package me.goudham;
 import java.awt.Image;
 import java.awt.Toolkit;
 import java.awt.datatransfer.Clipboard;
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.Transferable;
+import java.awt.datatransfer.UnsupportedFlavorException;
 import java.io.File;
 import java.util.List;
+import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -102,4 +106,60 @@ abstract class ClipboardListener {
     void setEventManager(EventManager eventManager) {
         this.eventManager = eventManager;
     }
+
+    static class TransferableFileList implements Transferable {
+
+        private final List<File> fileList;
+
+        public TransferableFileList(@NotNull List<File> fileList) {
+            this.fileList = fileList;
+        }
+
+        @Override
+        public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
+            if (flavor.equals(DataFlavor.javaFileListFlavor)) {
+                return fileList;
+            } else {
+                throw new UnsupportedFlavorException(flavor);
+            }
+        }
+
+        @Override
+        public DataFlavor[] getTransferDataFlavors() {
+            return new DataFlavor[] { DataFlavor.javaFileListFlavor };
+        }
+
+        @Override
+        public boolean isDataFlavorSupported(DataFlavor flavor) {
+            return flavor == DataFlavor.javaFileListFlavor;
+        }
+    }
+
+    static class TransferableImage implements Transferable {
+
+        private final Image image;
+
+        public TransferableImage(@NotNull Image image) {
+            this.image = image;
+        }
+
+        @Override
+        public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
+            if (flavor.equals(DataFlavor.imageFlavor)) {
+                return image;
+            } else {
+                throw new UnsupportedFlavorException(flavor);
+            }
+        }
+
+        @Override
+        public DataFlavor[] getTransferDataFlavors() {
+            return new DataFlavor[] { DataFlavor.imageFlavor };
+        }
+
+        @Override
+        public boolean isDataFlavorSupported(DataFlavor flavor) {
+            return flavor == DataFlavor.imageFlavor;
+        }
+    }
 }

src/main/java/me/goudham/ClipboardUtils.java

@@ -10,15 +10,13 @@ import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
 import java.util.List;
-import me.goudham.domain.MyClipboardContent;
 import me.goudham.domain.OldClipboardContent;
-import me.goudham.domain.OldImage;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import static me.goudham.domain.Contents.FILELIST;
+import static me.goudham.Contents.FILELIST;
-import static me.goudham.domain.Contents.IMAGE;
+import static me.goudham.Contents.IMAGE;
-import static me.goudham.domain.Contents.TEXT;
+import static me.goudham.Contents.TEXT;
 
 class ClipboardUtils {
     protected static Logger logger = LoggerFactory.getLogger(ClipboardUtils.class);

src/main/java/me/goudham/Contents.java

@@ -1,9 +1,9 @@
-package me.goudham.domain;
+package me.goudham;
 
 import java.awt.datatransfer.Clipboard;
 import java.awt.datatransfer.DataFlavor;
 
-public enum Contents {
+enum Contents {
     TEXT(DataFlavor.stringFlavor) {
         @Override
         public boolean isAvailable(Clipboard clipboard) {
@@ -29,9 +29,9 @@ public enum Contents {
        this.dataFlavor = dataFlavor;
     }
 
-    public DataFlavor getDataFlavor() {
+    DataFlavor getDataFlavor() {
         return dataFlavor;
     }
 
-    public abstract boolean isAvailable(Clipboard clipboard);
+    abstract boolean isAvailable(Clipboard clipboard);
 }

src/main/java/me/goudham/MacClipboardListener.java

@@ -10,19 +10,15 @@ import java.util.List;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-import me.goudham.domain.MyClipboardContent;
 import me.goudham.domain.OldClipboardContent;
-import me.goudham.domain.OldImage;
-import me.goudham.domain.TransferableFileList;
-import me.goudham.domain.TransferableImage;
 
 import static java.lang.Thread.sleep;
 import static me.goudham.ClipboardUtils.getFileContent;
 import static me.goudham.ClipboardUtils.getImageContent;
 import static me.goudham.ClipboardUtils.getStringContent;
-import static me.goudham.domain.Contents.FILELIST;
+import static me.goudham.Contents.FILELIST;
-import static me.goudham.domain.Contents.IMAGE;
+import static me.goudham.Contents.IMAGE;
-import static me.goudham.domain.Contents.TEXT;
+import static me.goudham.Contents.TEXT;
 
 class MacClipboardListener extends ClipboardListener implements Runnable {
     ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();

src/main/java/me/goudham/MyClipboardContent.java

@@ -1,11 +1,11 @@
-package me.goudham.domain;
+package me.goudham;
 
 import java.util.Objects;
 
-public class MyClipboardContent<T> {
+class MyClipboardContent<T> {
     private T oldContent;
 
-    public MyClipboardContent() {
+    MyClipboardContent() {
     }
 
     public void setOldContent(Object oldContent) {

src/main/java/me/goudham/OldImage.java

@@ -1,14 +1,14 @@
-package me.goudham.domain;
+package me.goudham;
 
 import java.awt.Dimension;
 import java.awt.image.BufferedImage;
 import java.util.Objects;
 
-public class OldImage {
+class OldImage {
     private BufferedImage oldBufferedImage;
     private Dimension oldDimension;
 
-    public OldImage(BufferedImage oldBufferedImage, Dimension oldDimension) {
+    OldImage(BufferedImage oldBufferedImage, Dimension oldDimension) {
         this.oldBufferedImage = oldBufferedImage;
         this.oldDimension = oldDimension;
     }

src/main/java/me/goudham/WindowsOrUnixClipboardListener.java

@@ -12,17 +12,15 @@ import java.util.List;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import me.goudham.domain.OldClipboardContent;
-import me.goudham.domain.TransferableFileList;
-import me.goudham.domain.TransferableImage;
 
 import static java.lang.Thread.currentThread;
 import static java.lang.Thread.sleep;
 import static me.goudham.ClipboardUtils.getFileContent;
 import static me.goudham.ClipboardUtils.getImageContent;
 import static me.goudham.ClipboardUtils.getStringContent;
-import static me.goudham.domain.Contents.FILELIST;
+import static me.goudham.Contents.FILELIST;
-import static me.goudham.domain.Contents.IMAGE;
+import static me.goudham.Contents.IMAGE;
-import static me.goudham.domain.Contents.TEXT;
+import static me.goudham.Contents.TEXT;
 
 class WindowsOrUnixClipboardListener extends ClipboardListener implements Runnable, ClipboardOwner {
     private ExecutorService executorService = Executors.newSingleThreadExecutor();

src/main/java/me/goudham/domain/TransferableFileList.java

@@ -1,36 +0,0 @@
-package me.goudham.domain;
-
-import java.awt.datatransfer.DataFlavor;
-import java.awt.datatransfer.Transferable;
-import java.awt.datatransfer.UnsupportedFlavorException;
-import java.io.File;
-import java.util.List;
-import org.jetbrains.annotations.NotNull;
-
-public class TransferableFileList implements Transferable {
-
-    private final List<File> fileList;
-
-    public TransferableFileList(@NotNull List<File> fileList) {
-        this.fileList = fileList;
-    }
-
-    @Override
-    public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
-        if (flavor.equals(DataFlavor.javaFileListFlavor)) {
-            return fileList;
-        } else {
-            throw new UnsupportedFlavorException(flavor);
-        }
-    }
-
-    @Override
-    public DataFlavor[] getTransferDataFlavors() {
-        return new DataFlavor[] { DataFlavor.javaFileListFlavor };
-    }
-
-    @Override
-    public boolean isDataFlavorSupported(DataFlavor flavor) {
-        return flavor == DataFlavor.javaFileListFlavor;
-    }
-}

src/main/java/me/goudham/domain/TransferableImage.java

@@ -1,35 +0,0 @@
-package me.goudham.domain;
-
-import java.awt.Image;
-import java.awt.datatransfer.DataFlavor;
-import java.awt.datatransfer.Transferable;
-import java.awt.datatransfer.UnsupportedFlavorException;
-import org.jetbrains.annotations.NotNull;
-
-public class TransferableImage implements Transferable {
-
-	private final Image image;
-
-	public TransferableImage(@NotNull Image image) {
-		this.image = image;
-	}
-
-	@Override
-	public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
-		if (flavor.equals(DataFlavor.imageFlavor)) {
-			return image;
-		} else {
-			throw new UnsupportedFlavorException(flavor);
-		}
-	}
-
-	@Override
-	public DataFlavor[] getTransferDataFlavors() {
-		return new DataFlavor[] { DataFlavor.imageFlavor };
-	}
-
-	@Override
-	public boolean isDataFlavorSupported(DataFlavor flavor) {
-		return flavor == DataFlavor.imageFlavor;
-	}
-}