| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /** |
| * 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 com.sun.org.apache.xml.internal.security.utils; |
| |
| |
| /** |
| * A Factory to return an XPathAPI instance. If Xalan is available it returns XalanXPathAPI. If not, then |
| * it returns JDKXPathAPI. |
| */ |
| public abstract class XPathFactory { |
| |
| private static boolean xalanInstalled; |
| |
| static { |
| try { |
| Class<?> funcTableClass = |
| ClassLoaderUtils.loadClass("com.sun.org.apache.xpath.internal.compiler.FunctionTable", XPathFactory.class); |
| if (funcTableClass != null) { |
| xalanInstalled = true; |
| } |
| } catch (Exception e) { |
| //ignore |
| } |
| } |
| |
| protected synchronized static boolean isXalanInstalled() { |
| return xalanInstalled; |
| } |
| |
| /** |
| * Get a new XPathFactory instance |
| */ |
| public static XPathFactory newInstance() { |
| if (!isXalanInstalled()) { |
| return new JDKXPathFactory(); |
| } |
| // Xalan is available |
| if (XalanXPathAPI.isInstalled()) { |
| return new XalanXPathFactory(); |
| } |
| // Some problem was encountered in fixing up the Xalan FunctionTable so fall back to the |
| // JDK implementation |
| return new JDKXPathFactory(); |
| } |
| |
| /** |
| * Get a new XPathAPI instance |
| */ |
| public abstract XPathAPI newXPathAPI(); |
| |
| } |