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	/*
	* 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
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	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
	StringBuffer("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());
	}
	}

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