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package org.madore.damlengine;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import org.w3c.dom.Attr;
public class LangHelper {
public static final String LANG = "lang";
public static String getLangNorec(Node node) {
// Returns null when no xml:lang attribute is found,
// otherwise, returns its value.
if ( node instanceof Element ) {
Attr lang = ((Element)node).
getAttributeNodeNS(DamlEngine.XML_NS, LANG);
if ( lang == null )
return null;
else
return lang.getValue();
} else
return null;
}
public static void setLangNorec(Element node, String lang) {
if ( lang == null )
throw new NullPointerException("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) {
// Never returns null (returns the empty string for no language).
// node may be null (in which case, return "").
while ( node != null ) {
String lang = getLangNorec(node);
if ( lang != null )
return lang;
node = node.getParentNode();
}
return "";
}
public static void setLangRec(Element node, String lang) {
if ( lang == null )
throw new NullPointerException("lang is null in setLangRec");
String parentLang = getLangRec(node.getParentNode());
if ( lang.equals(parentLang) )
unsetLangNorec(node);
else
setLangNorec(node,lang);
}
}
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