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: FuncNamespace.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.XObject; 26 import org.apache.xpath.objects.XString; 27 28 /** 29 * Execute the Namespace() function. 30 * @xsl.usage advanced 31 */ 32 public class FuncNamespace extends FunctionDef1Arg 33 { 34 static final long serialVersionUID = -4695674566722321237L; 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 int context = getArg0AsNode(xctxt); 48 49 String s; 50 if(context != DTM.NULL) 51 { 52 DTM dtm = xctxt.getDTM(context); 53 int t = dtm.getNodeType(context); 54 if(t == DTM.ELEMENT_NODE) 55 { 56 s = dtm.getNamespaceURI(context); 57 } 58 else if(t == DTM.ATTRIBUTE_NODE) 59 { 60 61 // This function always returns an empty string for namespace nodes. 62 // We check for those here. Fix inspired by Davanum Srinivas. 63 64 s = dtm.getNodeName(context); 65 if(s.startsWith("xmlns:") || s.equals("xmlns")) 66 return XString.EMPTYSTRING; 67 68 s = dtm.getNamespaceURI(context); 69 } 70 else 71 return XString.EMPTYSTRING; 72 } 73 else 74 return XString.EMPTYSTRING; 75 76 return ((null == s) ? XString.EMPTYSTRING : new XString(s)); 77 } 78 } 79