1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 /* 19 * $Id: FuncLang.java 468655 2006-10-28 07:12:06Z minchau $ 20 */ 21 package org.apache.xpath.functions; 22 23 import org.apache.xml.dtm.DTM; 24 import org.apache.xpath.XPathContext; 25 import org.apache.xpath.objects.XBoolean; 26 import org.apache.xpath.objects.XObject; 27 28 /** 29 * Execute the Lang() function. 30 * @xsl.usage advanced 31 */ 32 public class FuncLang extends FunctionOneArg 33 { 34 static final long serialVersionUID = -7868705139354872185L; 35 36 /** 37 * Execute the function. The function must return 38 * a valid object. 39 * @param xctxt The current execution context. 40 * @return A valid XObject. 41 * 42 * @throws javax.xml.transform.TransformerException 43 */ execute(XPathContext xctxt)44 public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 45 { 46 47 String lang = m_arg0.execute(xctxt).str(); 48 int parent = xctxt.getCurrentNode(); 49 boolean isLang = false; 50 DTM dtm = xctxt.getDTM(parent); 51 52 while (DTM.NULL != parent) 53 { 54 if (DTM.ELEMENT_NODE == dtm.getNodeType(parent)) 55 { 56 int langAttr = dtm.getAttributeNode(parent, "http://www.w3.org/XML/1998/namespace", "lang"); 57 58 if (DTM.NULL != langAttr) 59 { 60 String langVal = dtm.getNodeValue(langAttr); 61 // %OPT% 62 if (langVal.toLowerCase().startsWith(lang.toLowerCase())) 63 { 64 int valLen = lang.length(); 65 66 if ((langVal.length() == valLen) 67 || (langVal.charAt(valLen) == '-')) 68 { 69 isLang = true; 70 } 71 } 72 73 break; 74 } 75 } 76 77 parent = dtm.getParent(parent); 78 } 79 80 return isLang ? XBoolean.S_TRUE : XBoolean.S_FALSE; 81 } 82 } 83