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/*
 * ====================
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2008-2009 Sun Microsystems, Inc. All rights reserved.     
 * 
 * The contents of this file are subject to the terms of the Common Development 
 * and Distribution License("CDDL") (the "License").  You may not use this file 
 * except in compliance with the License.
 * 
 * You can obtain a copy of the License at 
 * http://IdentityConnectors.dev.java.net/legal/license.txt
 * See the License for the specific language governing permissions and limitations 
 * under the License. 
 * 
 * When distributing the Covered Code, include this CDDL Header Notice in each file
 * and include the License file at identityconnectors/legal/license.txt.
 * If applicable, add the following below this CDDL Header, with the fields 
 * enclosed by brackets [] replaced by your own identifying information: 
 * "Portions Copyrighted [year] [name of copyright owner]"
 * ====================
 */
package org.identityconnectors.common.l10n;

import java.util.Locale;

/**
 * Thread local variable that impacts localization
 * of all messages in the connector framework. This is 
 * roughly equivalent to .Net's Thread.CurrentCulture. Note
 * that this is an inheritable thread local so it
 * is automatically inherited from parent to child thread.
 * Of course, if the child thread is part of a thread
 * pool, you will still need to manually propagate
 * from parent to child.
 */
public class CurrentLocale {
    private static final InheritableThreadLocal
        _value = new InheritableThreadLocal();
    /**
     * Sets the locale for the current thread.
     * @param locale The locale to use.
     */
    public static void set(Locale locale) {
        _value.set(locale);
    }
    
    /**
     * Clears the locale for the current thread.
     */
    public static void clear() {
        set(null);
    }
    
    /**
     * Gets the locale from the current thread.
     * Returns Locale.getDefault if
     * no locale is specified.
     * @return the locale from the current thread.
     */
    public static Locale get() {
        Locale rv = _value.get();
        return rv == null ? Locale.getDefault() : rv;
    }
    
    /**
     * Returns true iff a thread-local locale is specified
     * on the current thread. 
     * @return true iff a thread-local locale is specified
     * on the current thread.
     */
    public static boolean isSet() {
        return _value.get() != null;
    }
}