Remove use of System.out and System.err in favor of regular logging

CHANGES.md

@@ -7,7 +7,8 @@ Release 5.1.1 (Next release)
 
 Features
 --------
-* [#1038](https://github.com/java-native-access/jna/issues/1038): Improve exception when native library loading fails by preserving the original exceptions and messages - [@matthiasblaesing](https://github.com/matthiasblaesing).
+* [#1038](https://github.com/java-native-access/jna/pull/1038): Improve exception when native library loading fails by preserving the original exceptions and messages - [@matthiasblaesing](https://github.com/matthiasblaesing).
+* [#1039](https://github.com/java-native-access/jna/pull/1039): Remove use of `System.out` and `System.err` in favor of regular logging - [@matthiasblaesing](https://github.com/matthiasblaesing).
 
 Bug Fixes
 ---------

contrib/platform/src/com/sun/jna/platform/WindowUtils.java

@@ -114,6 +114,8 @@
 import com.sun.jna.ptr.ByteByReference;
 import com.sun.jna.ptr.IntByReference;
 import com.sun.jna.ptr.PointerByReference;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * Provides additional features on a Java {@link Window}.
@@ -159,6 +161,8 @@
 // 50% threshold, some might want zero/non-zero
 public class WindowUtils {
 
+    private static final Logger LOG = Logger.getLogger(WindowUtils.class.getName());
+
     private static final String TRANSPARENT_OLD_BG = "transparent-old-bg";
     private static final String TRANSPARENT_OLD_OPAQUE = "transparent-old-opaque";
     private static final String TRANSPARENT_ALPHA = "transparent-alpha";
@@ -1365,7 +1369,8 @@ private void fixWindowDragging(Window w, String context) {
                 if (oldDraggable == null) {
                     p.putClientProperty(WDRAG, Boolean.FALSE);
                     if (w.isDisplayable()) {
-                        System.err.println(context + "(): To avoid content dragging, " + context + "() must be called before the window is realized, or " + WDRAG + " must be set to Boolean.FALSE before the window is realized.  If you really want content dragging, set " + WDRAG + " on the window's root pane to Boolean.TRUE before calling " + context + "() to hide this message.");
+                        LOG.log(Level.WARNING, "{0}(): To avoid content dragging, {1}() must be called before the window is realized, or " + WDRAG + " must be set to Boolean.FALSE before the window is realized.  If you really want content dragging, set " + WDRAG + " on the window''s root pane to Boolean.TRUE before calling {2}() to hide this message.",
+                                new Object[]{context, context, context});
                     }
                 }
             }

contrib/platform/src/com/sun/jna/platform/dnd/DragHandler.java

@@ -23,6 +23,7 @@
  */
 package com.sun.jna.platform.dnd;
 
+import com.sun.jna.Platform;
 import java.awt.AlphaComposite;
 import java.awt.Component;
 import java.awt.Cursor;
@@ -49,6 +50,8 @@
 import java.awt.dnd.InvalidDnDOperationException;
 import java.awt.event.InputEvent;
 import java.awt.image.BufferedImage;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import javax.swing.Icon;
 import javax.swing.JColorChooser;
@@ -110,6 +113,8 @@
 public abstract class DragHandler 
     implements DragSourceListener, DragSourceMotionListener, DragGestureListener {
 
+    private static final Logger LOG = Logger.getLogger(DragHandler.class.getName());
+
     /** Default maximum size for ghosted images. */
     public static final Dimension MAX_GHOST_SIZE = new Dimension(250, 250);
 
@@ -138,8 +143,7 @@ public abstract class DragHandler
     // w32 others: copy=ctrl
     /** Modifier mask for a user-requested move. */
     static final int MOVE_MASK = InputEvent.SHIFT_DOWN_MASK;
-    static final boolean OSX = 
-        System.getProperty("os.name").toLowerCase().indexOf("mac") != -1;
+    static final boolean OSX = Platform.isMac();
     /** Modifier mask for a user-requested copy. */
     static final int COPY_MASK = 
         OSX ? InputEvent.ALT_DOWN_MASK : InputEvent.CTRL_DOWN_MASK;
@@ -175,16 +179,12 @@ static int getModifiers() {
     public static Transferable getTransferable(DropTargetEvent e) {
         if (e instanceof DropTargetDragEvent) {
             try {
-                // getTransferable is available during drag only on 1.5+
-                return (Transferable)
-                    e.getClass().getMethod("getTransferable", (Class[])null).invoke(e, (Object[])null);
-            }
-            catch(Exception ex) {
+                return ((DropTargetDragEvent) e).getTransferable();
+            } catch (Exception ex) {
                 // Method not available
             }
-        }
-        else if (e instanceof DropTargetDropEvent) {
-            return ((DropTargetDropEvent)e).getTransferable();
+        } else if (e instanceof DropTargetDropEvent) {
+            return ((DropTargetDropEvent) e).getTransferable();
         }
         return transferable;
     }
@@ -309,6 +309,7 @@ protected void dragStarted(DragGestureEvent e) { }
      * responsible for initiating the drag operation.
      * @param e event
      */
+    @Override
     public void dragGestureRecognized(DragGestureEvent e) {
         if ((e.getDragAction() & supportedActions) != 0
             && canDrag(e)) {
@@ -489,26 +490,37 @@ static String actionString(int action) {
     }
     private String lastAction;
     private void describe(String type, DragSourceEvent e) {
-        if (false) {
+        if (LOG.isLoggable(Level.FINE)) {
+            StringBuilder msgBuilder = new StringBuilder();
+            msgBuilder.append("drag: ");
+            msgBuilder.append(type);
             DragSourceContext ds = e.getDragSourceContext();
-            String msg = "drag: " + type;
             if (e instanceof DragSourceDragEvent) {
                 DragSourceDragEvent ev = (DragSourceDragEvent)e;
-                msg += ": src=" + actionString(ds.getSourceActions())
-                    + " usr=" + actionString(ev.getUserAction())
-                    + " tgt=" + actionString(ev.getTargetActions())
-                    + " act=" + actionString(ev.getDropAction())
-                    + " mods=" + ev.getGestureModifiersEx();
+                msgBuilder.append(": src=");
+                msgBuilder.append(actionString(ds.getSourceActions()));
+                msgBuilder.append(" usr=");
+                msgBuilder.append(actionString(ev.getUserAction()));
+                msgBuilder.append(" tgt=");
+                msgBuilder.append(actionString(ev.getTargetActions()));
+                msgBuilder.append(" act=");
+                msgBuilder.append(actionString(ev.getDropAction()));
+                msgBuilder.append(" mods=");
+                msgBuilder.append(ev.getGestureModifiersEx());
             }
             else {
-                msg += ": e=" + e;
+                msgBuilder.append(": e=");
+                msgBuilder.append(e);
             }
+            String msg = msgBuilder.toString();
             if (!msg.equals(lastAction)) {
-                System.out.println(lastAction = msg);
+                LOG.log(Level.FINE, msg);
+                lastAction = msg;
             }
         }
     }
 
+    @Override
     public void dragDropEnd(DragSourceDropEvent e) {
         describe("end", e);
         setModifiers(UNKNOWN_MODIFIERS);
@@ -532,6 +544,7 @@ private Point getImageLocation(Point where) {
         return where;
     }
 
+    @Override
     public void dragEnter(DragSourceDragEvent e) {
         describe("enter", e);
         if (ghost != null) {
@@ -544,6 +557,7 @@ public void dragEnter(DragSourceDragEvent e) {
     // which has reports "0" for the available target actions (1.4+?)
     // filed a bug for this
     private boolean moved;
+    @Override
     public void dragMouseMoved(DragSourceDragEvent e) {
         describe("move", e);
         if (ghost != null) {
@@ -554,6 +568,7 @@ public void dragMouseMoved(DragSourceDragEvent e) {
         moved = true;
     }
 
+    @Override
     public void dragOver(DragSourceDragEvent e) {
         describe("over", e);
         if (ghost != null) {
@@ -562,10 +577,12 @@ public void dragOver(DragSourceDragEvent e) {
         updateCursor(e);
     }
 
+    @Override
     public void dragExit(DragSourceEvent e) {
         describe("exit", e);
     }
 
+    @Override
     public void dropActionChanged(DragSourceDragEvent e) {
         describe("change", e);
         setModifiers(e.getGestureModifiersEx() & KEY_MASK);

contrib/platform/src/com/sun/jna/platform/dnd/DropHandler.java

@@ -40,6 +40,8 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /** Provides simplified drop handling for a component.
  * Usage:<br>    
@@ -97,6 +99,8 @@
 // the TransferHandler to drop
 public abstract class DropHandler implements DropTargetListener {
 
+    private static final Logger LOG = Logger.getLogger(DropHandler.class.getName());
+
     private int acceptedActions;
     private List<DataFlavor> acceptedFlavors;
     private DropTarget dropTarget;
@@ -275,26 +279,36 @@ protected boolean modifiersActive(int dropAction) {
 
     private String lastAction;
     private void describe(String type, DropTargetEvent e) {
-        if (false) {
-            String msg = "drop: " + type;
+        if(LOG.isLoggable(Level.FINE)) {
+            StringBuilder msgBuilder = new StringBuilder();
+            msgBuilder.append("drop: ");
+            msgBuilder.append(type);
             if (e instanceof DropTargetDragEvent) {
                 DropTargetContext dtc = e.getDropTargetContext();
                 DropTarget dt = dtc.getDropTarget();
-                DropTargetDragEvent ev = (DropTargetDragEvent)e;
-                msg += ": src=" + DragHandler.actionString(ev.getSourceActions())
-                    + " tgt=" + DragHandler.actionString(dt.getDefaultActions())
-                    + " act=" + DragHandler.actionString(ev.getDropAction());
+                DropTargetDragEvent ev = (DropTargetDragEvent) e;
+                msgBuilder.append(": src=");
+                msgBuilder.append(DragHandler.actionString(ev.getSourceActions()));
+                msgBuilder.append(" tgt=");
+                msgBuilder.append(DragHandler.actionString(dt.getDefaultActions()));
+                msgBuilder.append(" act=");
+                msgBuilder.append(DragHandler.actionString(ev.getDropAction()));
             }
             else if (e instanceof DropTargetDropEvent) {
                 DropTargetContext dtc = e.getDropTargetContext();
                 DropTarget dt = dtc.getDropTarget();
                 DropTargetDropEvent ev = (DropTargetDropEvent)e;
-                msg += ": src=" + DragHandler.actionString(ev.getSourceActions())
-                + " tgt=" + DragHandler.actionString(dt.getDefaultActions())
-                + " act=" + DragHandler.actionString(ev.getDropAction());
+                msgBuilder.append(": src=");
+                msgBuilder.append(DragHandler.actionString(ev.getSourceActions()));
+                msgBuilder.append(" tgt=");
+                msgBuilder.append(DragHandler.actionString(dt.getDefaultActions()));
+                msgBuilder.append(" act=");
+                msgBuilder.append(DragHandler.actionString(ev.getDropAction()));
             }
+            String msg = msgBuilder.toString();
             if (!msg.equals(lastAction)) {
-                System.out.println(lastAction = msg);
+                LOG.log(Level.FINE, msg);
+                lastAction = msg;
             }
         }
     }
@@ -317,23 +331,27 @@ protected int acceptOrReject(DropTargetDragEvent e) {
         return action;
     }
 
+    @Override
     public void dragEnter(DropTargetDragEvent e) {
         describe("enter(tgt)", e);
         int action = acceptOrReject(e);
         paintDropTarget(e, action, e.getLocation());
     }
 
+    @Override
     public void dragOver(DropTargetDragEvent e) {
         describe("over(tgt)", e);
         int action = acceptOrReject(e);
         paintDropTarget(e, action, e.getLocation());
     }
 
+    @Override
     public void dragExit(DropTargetEvent e) {
         describe("exit(tgt)", e);
         paintDropTarget(e, DragHandler.NONE, null);
     }
 
+    @Override
     public void dropActionChanged(DropTargetDragEvent e) {
         describe("change(tgt)", e);
         int action = acceptOrReject(e);
@@ -344,6 +362,7 @@ public void dropActionChanged(DropTargetDragEvent e) {
      * standard drop validity checking and handling, then invokes
      * {@link #drop(DropTargetDropEvent,int)} if the drop looks acceptable.
      */
+    @Override
     public void drop(DropTargetDropEvent e) {
         describe("drop(tgt)", e);
         int action = getDropAction(e);
@@ -353,12 +372,10 @@ public void drop(DropTargetDropEvent e) {
                 drop(e, action);
                 // Just in case this hasn't been done yet
                 e.dropComplete(true);
-            }
-            catch (Exception ex) {
+            } catch (Exception ex) {
                 e.dropComplete(false);
             }
-        }
-        else {
+        } else {
             e.rejectDrop();
         }
         paintDropTarget(e, DragHandler.NONE, e.getLocation());

contrib/platform/src/com/sun/jna/platform/win32/W32FileMonitor.java

@@ -36,9 +36,13 @@
 import com.sun.jna.platform.win32.WinNT.HANDLE;
 import com.sun.jna.ptr.IntByReference;
 import com.sun.jna.ptr.PointerByReference;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 public class W32FileMonitor extends FileMonitor {
 
+    private static final Logger LOG = Logger.getLogger(W32FileMonitor.class.getName());
+
     private static final int BUFFER_SIZE = 4096;
 
     private class FileInfo {
@@ -90,7 +94,7 @@ private void handleChanges(FileInfo finfo) throws IOException {
                 break;
             default:
                 // TODO: other actions...
-                System.err.println("Unrecognized file action '" + fni.Action + "'");
+                LOG.log(Level.WARNING, "Unrecognized file action ''{0}''", fni.Action);
             }
 
             if (event != null) {

contrib/platform/test/com/sun/jna/platform/TestNativeLoad.java

@@ -0,0 +1,12 @@
+
+package com.sun.jna.platform;
+
+import com.sun.jna.NativeLibrary;
+
+public class TestNativeLoad {
+    public static void main(String[] args) {
+        System.setProperty("jna.debug_load", "true");
+        NativeLibrary.addSearchPath("test", "/home/matthias/src/jnalib/");
+        NativeLibrary.getInstance("test");
+    }
+}