/*
* 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.
*/
/*
* $Id: FuncLang.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.functions;
import org.apache.xml.dtm.DTM;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XBoolean;
import org.apache.xpath.objects.XObject;
/**
* Execute the Lang() function.
* @xsl.usage advanced
*/
public class FuncLang extends FunctionOneArg
{
static final long serialVersionUID = -7868705139354872185L;
/**
* Execute the function. The function must return
* a valid object.
* @param xctxt The current execution context.
* @return A valid XObject.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
String lang = m_arg0.execute(xctxt).str();
int parent = xctxt.getCurrentNode();
boolean isLang = false;
DTM dtm = xctxt.getDTM(parent);
while (DTM.NULL != parent)
{
if (DTM.ELEMENT_NODE == dtm.getNodeType(parent))
{
int langAttr = dtm.getAttributeNode(parent, "http://www.w3.org/XML/1998/namespace", "lang");
if (DTM.NULL != langAttr)
{
String langVal = dtm.getNodeValue(langAttr);
// %OPT%
if (langVal.toLowerCase().startsWith(lang.toLowerCase()))
{
int valLen = lang.length();
if ((langVal.length() == valLen)
|| (langVal.charAt(valLen) == '-'))
{
isLang = true;
}
}
break;
}
}
parent = dtm.getParent(parent);
}
return isLang ? XBoolean.S_TRUE : XBoolean.S_FALSE;
}
}