nextapp.echo.app.LayoutDirection Maven / Gradle / Ivy
/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
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*/
package nextapp.echo.app;
import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Locale;
/**
* Describes the layout direction of text and content to provide support
* for bidirectional localization.
*/
public class LayoutDirection
implements Serializable {
/** Serial Version UID. */
private static final long serialVersionUID = 20070101L;
private static final Collection RTL_LANGUAGES;
static {
Collection rtlLanguages = new HashSet();
rtlLanguages.add("ar"); // Arabic
rtlLanguages.add("fa"); // Persian
rtlLanguages.add("iw"); // Hebrew
rtlLanguages.add("ur"); // Urdu
RTL_LANGUAGES = Collections.unmodifiableCollection(rtlLanguages);
}
public static final LayoutDirection LTR = new LayoutDirection(true);
public static final LayoutDirection RTL = new LayoutDirection(false);
/**
* Returns the default LayoutDirection for the specified
* Locale.
*
* @param locale the locale
* @return the default layout direction
*/
public static LayoutDirection forLocale(Locale locale) {
return RTL_LANGUAGES.contains(locale.getLanguage()) ? RTL : LTR;
}
private boolean leftToRight;
/**
* Creates a new LayoutDirection
*
* @param leftToRight a flag indicating whether the layout direction
* is left-to-right.
*/
private LayoutDirection(boolean leftToRight) {
super();
this.leftToRight = leftToRight;
}
/**
* Determines if the LayoutDirection is left-to-right.
*
* @return true if the LayoutDirection is left-to-right.
*/
public boolean isLeftToRight() {
return leftToRight;
}
/**
* @see java.lang.Object#toString()
*/
public String toString() {
return leftToRight ? "LTR" : "RTL";
}
}