| /* |
| * 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. |
| */ |
| |
| package org.apache.xalan.extensions; |
| |
| import javax.xml.namespace.QName; |
| import javax.xml.xpath.XPathFunction; |
| import javax.xml.xpath.XPathFunctionResolver; |
| import org.apache.xalan.res.XSLMessages; |
| import org.apache.xalan.res.XSLTErrorResources; |
| |
| /** |
| * A sample implementation of XPathFunctionResolver, with support for |
| * EXSLT extension functions and Java extension functions. |
| */ |
| public class XPathFunctionResolverImpl implements XPathFunctionResolver |
| { |
| /** |
| * Resolve an extension function from the qualified name and arity. |
| */ |
| public XPathFunction resolveFunction(QName qname, int arity) |
| { |
| if (qname == null) |
| throw new NullPointerException( |
| XSLMessages.createMessage( |
| XSLTErrorResources.ER_XPATH_RESOLVER_NULL_QNAME, null)); |
| |
| if (arity < 0) |
| throw new IllegalArgumentException( |
| XSLMessages.createMessage( |
| XSLTErrorResources.ER_XPATH_RESOLVER_NEGATIVE_ARITY, null)); |
| |
| String uri = qname.getNamespaceURI(); |
| if (uri == null || uri.length() == 0) |
| return null; |
| |
| String className = null; |
| String methodName = null; |
| if (uri.startsWith("http://exslt.org")) |
| { |
| className = getEXSLTClassName(uri); |
| methodName = qname.getLocalPart(); |
| } |
| else if (!uri.equals(ExtensionNamespaceContext.JAVA_EXT_URI)) |
| { |
| int lastSlash = className.lastIndexOf('/'); |
| if (-1 != lastSlash) |
| className = className.substring(lastSlash + 1); |
| } |
| |
| String localPart = qname.getLocalPart(); |
| int lastDotIndex = localPart.lastIndexOf('.'); |
| if (lastDotIndex > 0) |
| { |
| if (className != null) |
| className = className + "." + localPart.substring(0, lastDotIndex); |
| else |
| className = localPart.substring(0, lastDotIndex); |
| |
| methodName = localPart.substring(lastDotIndex + 1); |
| } |
| else |
| methodName = localPart; |
| |
| if(null == className || className.trim().length() == 0 |
| || null == methodName || methodName.trim().length() == 0) |
| return null; |
| |
| ExtensionHandler handler = null; |
| try |
| { |
| ExtensionHandler.getClassForName(className); |
| handler = new ExtensionHandlerJavaClass(uri, "javaclass", className); |
| } |
| catch (ClassNotFoundException e) |
| { |
| return null; |
| } |
| return new XPathFunctionImpl(handler, methodName); |
| } |
| |
| /** |
| * Return the implementation class name of an EXSLT extension from |
| * a given namespace uri. The uri must starts with "http://exslt.org". |
| */ |
| private String getEXSLTClassName(String uri) |
| { |
| if (uri.equals(ExtensionNamespaceContext.EXSLT_MATH_URI)) |
| return "org.apache.xalan.lib.ExsltMath"; |
| else if (uri.equals(ExtensionNamespaceContext.EXSLT_SET_URI)) |
| return "org.apache.xalan.lib.ExsltSets"; |
| else if (uri.equals(ExtensionNamespaceContext.EXSLT_STRING_URI)) |
| return "org.apache.xalan.lib.ExsltStrings"; |
| else if (uri.equals(ExtensionNamespaceContext.EXSLT_DATETIME_URI)) |
| return "org.apache.xalan.lib.ExsltDatetime"; |
| else if (uri.equals(ExtensionNamespaceContext.EXSLT_DYNAMIC_URI)) |
| return "org.apache.xalan.lib.ExsltDynamic"; |
| else if (uri.equals(ExtensionNamespaceContext.EXSLT_URI)) |
| return "org.apache.xalan.lib.ExsltCommon"; |
| else |
| return null; |
| } |
| } |