7188612: JTable's AccessibleJTable throws IllegalComponentStateException instead of null

Reviewed-by: rupashka

src/share/classes/javax/swing/JTable.java

@@ -8590,7 +8590,7 @@ public class JTable extends JComponent implements TableModelListener, Scrollable
              *    <code>null</code> if this object is not on the screen
              */
             public Point getLocationOnScreen() {
-                if (parent != null) {
+                if (parent != null && parent.isShowing()) {
                     Point parentLocation = parent.getLocationOnScreen();
                     Point componentLocation = getLocation();
                     componentLocation.translate(parentLocation.x, parentLocation.y);
@@ -9391,7 +9391,7 @@ public class JTable extends JComponent implements TableModelListener, Scrollable
              *    <code>null</code> if this object is not on the screen
              */
             public Point getLocationOnScreen() {
-                if (parent != null) {
+                if (parent != null && parent.isShowing()) {
                     Point parentLocation = parent.getLocationOnScreen();
                     Point componentLocation = getLocation();
                     componentLocation.translate(parentLocation.x, parentLocation.y);

test/javax/swing/JTable/7188612/JTableAccessibleGetLocationOnScreen.java

+/*
+ * Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * Portions Copyright (c) 2012 IBM Corporation
+ */
+
+/* @test
+ * @bug 7188612
+ * @summary AccessibleTableHeader and AccessibleJTableCell should stick to
+ *    AccessibleComponent.getLocationOnScreen api.
+ * @author Frank Ding
+ */
+
+import javax.accessibility.AccessibleComponent;
+import javax.accessibility.AccessibleTable;
+import javax.swing.JComponent;
+import javax.swing.JFrame;
+import javax.swing.JTable;
+import javax.swing.SwingUtilities;
+
+public class JTableAccessibleGetLocationOnScreen {
+    private static JFrame frame;
+    private static JTable table;
+
+    public static void main(String[] args) throws Exception {
+
+        SwingUtilities.invokeAndWait(new Runnable() {
+
+            @Override
+            public void run() {
+                constructInEDT();
+                try {
+                    assertGetLocation();
+                } finally {
+                    frame.dispose();
+                }
+            }
+        });
+
+    }
+
+    private static void constructInEDT() {
+        String[] columnNames = { "col1", "col2", };
+        Object[][] data = { { "row1, col1", "row1, col2" },
+                { "row2, col1", "row2, col2" }, };
+
+        frame = new JFrame(
+                "JTable AccessibleTableHeader and AccessibleJTableCell test");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        table = new JTable(data, columnNames);
+        frame.add(table);
+        frame.pack();
+    }
+
+    private static void assertGetLocation() {
+        // the frame is now invisible
+        // test getLocationOnScreen() of
+        // JTable$AccessibleJTable$AccessibleJTableHeaderCell
+        // and JTable$AccessibleJTable$AccessibleJTableCell
+        AccessibleTable accessibleTable = (AccessibleTable) table
+                .getAccessibleContext();
+        AccessibleTable header = accessibleTable.getAccessibleColumnHeader();
+        AccessibleComponent accessibleComp1 = (AccessibleComponent) header
+                .getAccessibleAt(0, 0);
+        // getLocation() must be null according to its javadoc and no exception
+        // is thrown
+        if (null != accessibleComp1.getLocationOnScreen()) {
+            throw new RuntimeException(
+                    "JTable$AccessibleJTable$AccessibleJTableHeaderCell."
+                            + "getLocation() must be null");
+        }
+
+        JComponent.AccessibleJComponent accessibleJComponent =
+                (JComponent.AccessibleJComponent) table.getAccessibleContext();
+        AccessibleComponent accessibleComp2 = (AccessibleComponent)
+                accessibleJComponent.getAccessibleChild(3);
+        // getLocation() must be null according to its javadoc and no exception
+        // is thrown
+        if (null != accessibleComp2.getLocationOnScreen()) {
+            throw new RuntimeException("JTable$AccessibleJTable$"
+                    + "AccessibleJTableCell.getLocation() must be null");
+        }
+
+    }
+}