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: FuncExtElementAvailable.java 468655 2006-10-28 07:12:06Z minchau $ 20 */ 21 package org.apache.xpath.functions; 22 23 import org.apache.xalan.templates.Constants; 24 import org.apache.xalan.transformer.TransformerImpl; 25 import org.apache.xml.utils.QName; 26 import org.apache.xpath.ExtensionsProvider; 27 import org.apache.xpath.XPathContext; 28 import org.apache.xpath.objects.XBoolean; 29 import org.apache.xpath.objects.XObject; 30 31 /** 32 * Execute the ExtElementAvailable() function. 33 * @xsl.usage advanced 34 */ 35 public class FuncExtElementAvailable extends FunctionOneArg 36 { 37 static final long serialVersionUID = -472533699257968546L; 38 39 /** 40 * Execute the function. The function must return 41 * a valid object. 42 * @param xctxt The current execution context. 43 * @return A valid XObject. 44 * 45 * @throws javax.xml.transform.TransformerException 46 */ execute(XPathContext xctxt)47 public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException 48 { 49 50 String prefix; 51 String namespace; 52 String methName; 53 54 String fullName = m_arg0.execute(xctxt).str(); 55 int indexOfNSSep = fullName.indexOf(':'); 56 57 if (indexOfNSSep < 0) 58 { 59 prefix = ""; 60 namespace = Constants.S_XSLNAMESPACEURL; 61 methName = fullName; 62 } 63 else 64 { 65 prefix = fullName.substring(0, indexOfNSSep); 66 namespace = xctxt.getNamespaceContext().getNamespaceForPrefix(prefix); 67 if (null == namespace) 68 return XBoolean.S_FALSE; 69 methName= fullName.substring(indexOfNSSep + 1); 70 } 71 72 if (namespace.equals(Constants.S_XSLNAMESPACEURL) 73 || namespace.equals(Constants.S_BUILTIN_EXTENSIONS_URL)) 74 { 75 try 76 { 77 TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject(); 78 return transformer.getStylesheet().getAvailableElements().containsKey( 79 new QName(namespace, methName)) 80 ? XBoolean.S_TRUE : XBoolean.S_FALSE; 81 } 82 catch (Exception e) 83 { 84 return XBoolean.S_FALSE; 85 } 86 } 87 else 88 { 89 //dml 90 ExtensionsProvider extProvider = (ExtensionsProvider)xctxt.getOwnerObject(); 91 return extProvider.elementAvailable(namespace, methName) 92 ? XBoolean.S_TRUE : XBoolean.S_FALSE; 93 } 94 } 95 } 96