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: FuncGenerateId.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 GenerateId() function. 30 * @xsl.usage advanced 31 */ 32 public class FuncGenerateId extends FunctionDef1Arg 33 { 34 static final long serialVersionUID = 973544842091724273L; 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 which = getArg0AsNode(xctxt); 48 49 if (DTM.NULL != which) 50 { 51 // Note that this is a different value than in previous releases 52 // of Xalan. It's sensitive to the exact encoding of the node 53 // handle anyway, so fighting to maintain backward compatability 54 // really didn't make sense; it may change again as we continue 55 // to experiment with balancing document and node numbers within 56 // that value. 57 return new XString("N" + Integer.toHexString(which).toUpperCase()); 58 } 59 else 60 return XString.EMPTYSTRING; 61 } 62 } 63