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package org.madore.damlengine;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
public class LangHelper {
public static final String LANG = "lang";
public static String getLangNorec(Node node) {
if ( node instanceof Element )
return ((Element)node).getAttributeNS(DamlEngine.XML_NS, LANG);
else
return null;
}
public static void setLangNorec(Element node, String lang) {
if ( lang == null )
throw new Error("lang is null in setLangNorec");
node.setAttributeNS(DamlEngine.XML_NS, LANG, lang);
}
public static void unsetLangNorec(Element node) {
node.removeAttributeNS(DamlEngine.XML_NS, LANG);
}
public static String getLangRec(Node node) {
// node may be null (in which case, return null)
while ( node != null ) {
String lang = getLangNorec(node);
if ( lang != null )
return lang;
node = node.getParentNode();
}
return null;
}
public static void setLangRec(Element node, String lang) {
if ( lang == null )
throw new Error("lang is null in setLangRec");
Node parentNode = node.getParentNode();
String parentLang = (parentNode!=null)?getLangNorec(parentNode):null;
if ( parentLang != null && lang.equals(parentLang) )
unsetLangNorec(node);
else
setLangNorec(node,lang);
}
}
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