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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Michael Danilov, Dmitry A. Durnev
* @version $Revision$
*/
package java.awt;
import java.io.Serializable;
import java.util.*;
/**
* The ComponentOrientation class specifies the language-sensitive orientation
* of component's elements or text. It is used to reflect the differences in this
* ordering between different writting systems. The ComponentOrientation class
* indicates the orientation of the elements/text in the horizontal direction
* ("left to right" or "right to left") and in the vertical direction
* ("top to bottom" or "bottom to top").
*/
public final class ComponentOrientation implements Serializable {
/** The Constant serialVersionUID. */
private static final long serialVersionUID = -4113291392143563828L;
/**
* The Constant LEFT_TO_RIGHT indicates that items run left to right.
*/
public static final ComponentOrientation LEFT_TO_RIGHT = new ComponentOrientation(true, true);
/**
* The Constant RIGHT_TO_LEFT indicates that items run right to left.
*/
public static final ComponentOrientation RIGHT_TO_LEFT = new ComponentOrientation(true, false);
/** The Constant UNKNOWN indicates that a component's orientation is not set. */
public static final ComponentOrientation UNKNOWN = new ComponentOrientation(true, true);
/** The Constant rlLangs. */
private static final Set<String> rlLangs = new HashSet<String>(); //RIGHT_TO_LEFT languages
/** The horizontal. */
private final boolean horizontal;
/** The left2right. */
private final boolean left2right;
static {
rlLangs.add("ar"); //$NON-NLS-1$
rlLangs.add("fa"); //$NON-NLS-1$
rlLangs.add("iw"); //$NON-NLS-1$
rlLangs.add("ur"); //$NON-NLS-1$
}
/**
* Gets the orientation for the given ResourceBundle's localization.
*
* @param bdl the ResourceBundle.
*
* @return the ComponentOrientation.
*
* @deprecated Use getOrientation(java.util.Locale) method.
*/
@Deprecated
public static ComponentOrientation getOrientation(ResourceBundle bdl) {
Object obj = null;
try {
obj = bdl.getObject("Orientation"); //$NON-NLS-1$
}
catch (MissingResourceException mre) {
obj = null;
}
if (obj instanceof ComponentOrientation) {
return (ComponentOrientation) obj;
}
Locale locale = bdl.getLocale();
if (locale == null) {
locale = Locale.getDefault();
}
return getOrientation(locale);
}
/**
* Gets the orientation for the specified locale.
*
* @param locale the specified Locale.
*
* @return the ComponentOrientation.
*/
public static ComponentOrientation getOrientation(Locale locale) {
String lang = locale.getLanguage();
return rlLangs.contains(lang) ? RIGHT_TO_LEFT : LEFT_TO_RIGHT;
}
/**
* Instantiates a new component orientation.
*
* @param hor whether the items should be arranged horizontally
* @param l2r whether this orientation specifies a left-to-right flow
*/
private ComponentOrientation(boolean hor, boolean l2r) {
horizontal = hor;
left2right = l2r;
}
/**
* Returns true if the text of the of writing systems arranged
* horizontally.
*
* @return true, if the text is written horizontally, false
* for a vertical arrangement.
*/
public boolean isHorizontal() {
return horizontal;
}
/**
* Returns true if the text is arranged from left to right.
*
* @return true, for writing systems written from left to right;
* false for right-to-left.
*/
public boolean isLeftToRight() {
return left2right;
}
}
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