From 72c90e8bef113bbbfa944f8a8ce6601d8d44ecfc Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david@procyon.(none)>
Date: Sun, 18 Apr 2010 18:37:48 +0200
Subject: Helper class for xml:lang handling.

---
 org/madore/damlengine/DamlEngine.java |  1 +
 org/madore/damlengine/LangHelper.java | 49 +++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 org/madore/damlengine/LangHelper.java

(limited to 'org')

diff --git a/org/madore/damlengine/DamlEngine.java b/org/madore/damlengine/DamlEngine.java
index 03e089d..4861f06 100644
--- a/org/madore/damlengine/DamlEngine.java
+++ b/org/madore/damlengine/DamlEngine.java
@@ -9,6 +9,7 @@ import org.apache.xerces.jaxp.DocumentBuilderFactoryImpl;
 
 public final class DamlEngine {
 
+    public static final String XML_NS = "http://www.w3.org/XML/1998/namespace";
     public static final String DAML_NS = "http://www.madore.org/~david/NS/daml/";
 
     private DamlEngine() { }  // Forbid instantiation
diff --git a/org/madore/damlengine/LangHelper.java b/org/madore/damlengine/LangHelper.java
new file mode 100644
index 0000000..280e5ca
--- /dev/null
+++ b/org/madore/damlengine/LangHelper.java
@@ -0,0 +1,49 @@
+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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