/*
* Copyright (c) 2003, 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
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*/
package sun.swing;
import java.awt.Color;
import java.awt.Insets;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.plaf.ComponentUI;
import sun.awt.AppContext;
/**
* DefaultLookup provides a way to customize the lookup done by the
* UIManager. The default implementation of DefaultLookup forwards
* the call to the UIManager.
* <p>
* <b>WARNING:</b> While this class is public, it should not be treated as
* public API and its API may change in incompatable ways between dot dot
* releases and even patch releases. You should not rely on this class even
* existing.
*
* @author Scott Violet
*/
public class DefaultLookup {
/**
* Key used to store DefaultLookup for AppContext.
*/
private static final Object DEFAULT_LOOKUP_KEY = new Object(); // DefaultLookup
/**
* Thread that last asked for a default.
*/
private static Thread currentDefaultThread;
/**
* DefaultLookup for last thread.
*/
private static DefaultLookup currentDefaultLookup;
/**
* If true, a custom DefaultLookup has been set.
*/
private static boolean isLookupSet;
/**
* Sets the DefaultLookup instance to use for the current
* <code>AppContext</code>. Null implies the UIManager should be
* used.
*/
public static void setDefaultLookup(DefaultLookup lookup) {
synchronized(DefaultLookup.class) {
if (!isLookupSet && lookup == null) {
// Null was passed in, and no one has invoked setDefaultLookup
// with a non-null value, we don't need to do anything.
return;
}
else if (lookup == null) {
// null was passed in, but someone has invoked setDefaultLookup
// with a non-null value, use an instance of DefautLookup
// which will fallback to UIManager.
lookup = new DefaultLookup();
}
isLookupSet = true;
AppContext.getAppContext().put(DEFAULT_LOOKUP_KEY, lookup);
currentDefaultThread = Thread.currentThread();
currentDefaultLookup = lookup;
}
}
public static Object get(JComponent c, ComponentUI ui, String key) {
boolean lookupSet;
synchronized(DefaultLookup.class) {
lookupSet = isLookupSet;
}
if (!lookupSet) {
// No one has set a valid DefaultLookup, use UIManager.
return UIManager.get(key, c.getLocale());
}
Thread thisThread = Thread.currentThread();
DefaultLookup lookup;
synchronized(DefaultLookup.class) {
// See if we've already cached the DefaultLookup for this thread,
// and use it if we have.
if (thisThread == currentDefaultThread) {
// It is cached, use it.
lookup = currentDefaultLookup;
}
else {
// Not cached, get the DefaultLookup to use from the AppContext
lookup = (DefaultLookup)AppContext.getAppContext().get(
DEFAULT_LOOKUP_KEY);
if (lookup == null) {
// Fallback to DefaultLookup, which will redirect to the
// UIManager.
lookup = new DefaultLookup();
AppContext.getAppContext().put(DEFAULT_LOOKUP_KEY, lookup);
}
// Cache the values to make the next lookup easier.
currentDefaultThread = thisThread;
currentDefaultLookup = lookup;
}
}
return lookup.getDefault(c, ui, key);
}
//
// The following are convenience method that all use getDefault.
//
public static int getInt(JComponent c, ComponentUI ui, String key,
int defaultValue) {
Object iValue = get(c, ui, key);
if (iValue == null || !(iValue instanceof Number)) {
return defaultValue;
}
return ((Number)iValue).intValue();
}
public static int getInt(JComponent c, ComponentUI ui, String key) {
return getInt(c, ui, key, -1);
}
public static Insets getInsets(JComponent c, ComponentUI ui, String key,
Insets defaultValue) {
Object iValue = get(c, ui, key);
if (iValue == null || !(iValue instanceof Insets)) {
return defaultValue;
}
return (Insets)iValue;
}
public static Insets getInsets(JComponent c, ComponentUI ui, String key) {
return getInsets(c, ui, key, null);
}
public static boolean getBoolean(JComponent c, ComponentUI ui, String key,
boolean defaultValue) {
Object iValue = get(c, ui, key);
if (iValue == null || !(iValue instanceof Boolean)) {
return defaultValue;
}
return ((Boolean)iValue).booleanValue();
}
public static boolean getBoolean(JComponent c, ComponentUI ui, String key) {
return getBoolean(c, ui, key, false);
}
public static Color getColor(JComponent c, ComponentUI ui, String key,
Color defaultValue) {
Object iValue = get(c, ui, key);
if (iValue == null || !(iValue instanceof Color)) {
return defaultValue;
}
return (Color)iValue;
}
public static Color getColor(JComponent c, ComponentUI ui, String key) {
return getColor(c, ui, key, null);
}
public static Icon getIcon(JComponent c, ComponentUI ui, String key,
Icon defaultValue) {
Object iValue = get(c, ui, key);
if (iValue == null || !(iValue instanceof Icon)) {
return defaultValue;
}
return (Icon)iValue;
}
public static Icon getIcon(JComponent c, ComponentUI ui, String key) {
return getIcon(c, ui, key, null);
}
public static Border getBorder(JComponent c, ComponentUI ui, String key,
Border defaultValue) {
Object iValue = get(c, ui, key);
if (iValue == null || !(iValue instanceof Border)) {
return defaultValue;
}
return (Border)iValue;
}
public static Border getBorder(JComponent c, ComponentUI ui, String key) {
return getBorder(c, ui, key, null);
}
public Object getDefault(JComponent c, ComponentUI ui, String key) {
// basic
return UIManager.get(key, c.getLocale());
}
}