/*
 * 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.usageadvanced
/** * 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.
Params:
  • xctxt – The current execution context.
Throws:
Returns:A valid XObject.
/** * 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; } }