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The MBeans plugin integrates JConsole's MBeans tab functionality into VisualVM.
/*
* Copyright (c) 2007, 2018, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
package org.graalvm.visualvm.modules.mbeans;
import java.awt.*;
import javax.accessibility.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.tree.*;
import static java.lang.Math.*;
/**
* Miscellaneous utility methods for JConsole
*/
class Utilities {
private static final String windowsLaF =
"com.sun.java.swing.plaf.windows.WindowsLookAndFeel"; // NOI18N
public static void updateTransparency(JComponent comp) {
LookAndFeel laf = UIManager.getLookAndFeel();
boolean transparent = laf.getClass().getName().equals(windowsLaF);
setTabbedPaneTransparency(comp, transparent);
}
private static void setTabbedPaneTransparency(JComponent comp, boolean transparent) {
for (Component child : comp.getComponents()) {
if (comp instanceof JTabbedPane) {
setTransparency((JComponent)child, transparent);
} else if (child instanceof JComponent) {
setTabbedPaneTransparency((JComponent)child, transparent);
}
}
}
private static void setTransparency(JComponent comp, boolean transparent) {
comp.setOpaque(!transparent);
for (Component child : comp.getComponents()) {
if (child instanceof JPanel ||
child instanceof JSplitPane ||
child instanceof JScrollPane ||
child instanceof JViewport ||
child instanceof JCheckBox) {
setTransparency((JComponent)child, transparent);
}
if (child instanceof XTree) {
XTree t = (XTree)child;
DefaultTreeCellRenderer cr = (DefaultTreeCellRenderer)t.getCellRenderer();
cr.setBackground(null);
cr.setBackgroundNonSelectionColor(new Color(0, 0, 0, 1));
t.setCellRenderer(cr);
setTransparency((JComponent)child, transparent);
}
}
}
/**
* A slightly modified border for JScrollPane to be used with a JTable inside
* a JTabbedPane. It has only top part and the rest is clipped to make the
* overall border less thick.
* The top border helps differentiating the containing table from its container.
*/
public static JScrollPane newTableScrollPane(JComponent comp) {
return new TableScrollPane(comp);
}
@SuppressWarnings("serial")
private static class TableScrollPane extends JScrollPane {
public TableScrollPane(JComponent comp) {
super(comp);
}
@Override
protected void paintBorder(Graphics g) {
Border border = getBorder();
if (border != null) {
Insets insets = border.getBorderInsets(this);
if (insets != null) {
Shape oldClip = g.getClip();
g.clipRect(0, 0, getWidth(), insets.top);
super.paintBorder(g);
g.setClip(oldClip);
}
}
}
}
public static void setAccessibleName(Accessible comp, String name) {
comp.getAccessibleContext().setAccessibleName(name);
}
public static void setAccessibleDescription(Accessible comp, String description) {
comp.getAccessibleContext().setAccessibleDescription(description);
}
/**
* Modifies color c1 to ensure it has acceptable contrast
* relative to color c2.
*
* http://www.w3.org/TR/AERT#color-contrast
* http://www.cs.rit.edu/~ncs/color/t_convert.html#RGB%20to%20YIQ%20&%20YIQ%20to%20RGB
*/
public static Color ensureContrast(Color c1, Color c2) {
double y1 = getColorBrightness(c1);
double y2 = getColorBrightness(c2);
if (abs(y1 - y2) < 125.0) {
if (y2 < 128.0) {
c1 = setColorBrightness(c1, y2 + 125.0);
} else {
c1 = setColorBrightness(c1, y2 - 125.0);
}
}
return c1;
}
public static double getColorBrightness(Color c) {
// Convert RGB -> YIQ and return the Y value
return (c.getRed() * 0.299 + c.getGreen() * 0.587 + c.getBlue() * 0.114);
}
private static Color setColorBrightness(Color c, double y) {
// Convert YIQ -> RGB
double i = (c.getRed() * 0.596 - c.getGreen() * 0.275 - c.getBlue() * 0.321);
double q = (c.getRed() * 0.212 - c.getGreen() * 0.523 + c.getBlue() * 0.311);
// Keep values in legal range. This may reduce the
// achieved contrast somewhat.
int r = max(0, min(255, (int)round(y + i * 0.956 + q * 0.621)));
int g = max(0, min(255, (int)round(y - i * 0.272 - q * 0.647)));
int b = max(0, min(255, (int)round(y - i * 1.105 + q * 1.702)));
return new Color(r, g, b);
}
}