Add facade classes for 3rd party programs

j3270/src/main/java/haus/nightmare/j3270/ui/StatusBar.java

@@ -29,6 +29,7 @@ public class StatusBar extends JPanel {
 
     private Telnet3270Client client;
     private TerminalPanel terminalPanel;
+    private haus.nightmare.lib3270j.ecl.ECLOIANotify oiaNotifyListener;
 
     public StatusBar() {
         setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
@@ -131,8 +132,15 @@ public class StatusBar extends JPanel {
     }
 
     public void setClient(Telnet3270Client client, TerminalPanel terminalPanel) {
+        if (this.client != null && this.client.getOIA() != null && this.oiaNotifyListener != null) {
+            this.client.getOIA().unregisterOIAEvent(this.oiaNotifyListener);
+        }
         this.client = client;
         this.terminalPanel = terminalPanel;
+        if (this.client != null && this.client.getOIA() != null) {
+            this.oiaNotifyListener = event -> updateStatus();
+            this.client.getOIA().registerOIAEvent(this.oiaNotifyListener);
+        }
         updateStatus();
     }
 
@@ -388,4 +396,8 @@ public class StatusBar extends JPanel {
         cursorPosition.setText(String.format("%03d/%03d [%04d]", row, col, curAddr));
         cursorPosition.setForeground(ThemeManager.getOiaFgNormal(theme));
     }
+
+    public String getLockStatusText() {
+        return lockStatus != null ? lockStatus.getText() : "";
+    }
 }

j3270/src/test/java/haus/nightmare/j3270/ui/StatusBarTest.java

@@ -59,4 +59,49 @@ public class StatusBarTest {
             // Ignored in headless environments
         }
     }
+
+    @Test
+    public void testStatusBarXSystemAndXProt() {
+        try {
+            ConnectionConfig config = new ConnectionConfig("mvs.example.com", 23, TerminalModel.IBM_3279_2, false);
+            Telnet3270Client client = new Telnet3270Client(config);
+            client.getTelnetFSM().setConnectionState(haus.nightmare.lib3270j.ConnectionState.CONNECTED_3270);
+
+            StatusBar statusBar = new StatusBar();
+            statusBar.setClient(client, null);
+            statusBar.updateStatus();
+
+            // Initially not locked
+            assertEquals("", statusBar.getLockStatusText());
+
+            // 1. Setup protected field and type into it -> triggers X PROT
+            client.getScreenBuffer().setFieldAttribute(0, (byte) haus.nightmare.lib3270j.protocol.DS3270Constants.FA_PROTECT);
+            client.getScreenBuffer().setCursorAddress(1);
+            client.typeCharacter('A');
+            statusBar.updateStatus();
+            assertEquals("X PROT", statusBar.getLockStatusText());
+
+            // 2. Reset -> clears X PROT
+            client.reset();
+            statusBar.updateStatus();
+            assertEquals("", statusBar.getLockStatusText());
+
+            // 3. Send Enter -> triggers X SYSTEM
+            client.sendEnter();
+            statusBar.updateStatus();
+            assertEquals("X SYSTEM", statusBar.getLockStatusText());
+
+            // 4. Host unlocks keyboard
+            client.getInputProcessor().setKeyboardLocked(false);
+            statusBar.updateStatus();
+            assertEquals("", statusBar.getLockStatusText());
+
+            // 5. Subsequent Enter -> triggers X SYSTEM again
+            client.sendEnter();
+            statusBar.updateStatus();
+            assertEquals("X SYSTEM", statusBar.getLockStatusText());
+        } catch (HeadlessException e) {
+            // Ignored in headless environments
+        }
+    }
 }