001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.xbean.spring.context.v2;
018    
019    import java.lang.reflect.Constructor;
020    
021    import org.springframework.beans.factory.config.BeanDefinition;
022    import org.springframework.beans.factory.xml.BeanDefinitionParserDelegate;
023    import org.springframework.beans.factory.xml.NamespaceHandler;
024    import org.springframework.beans.factory.xml.XmlReaderContext;
025    import org.w3c.dom.Element;
026    
027    public class XBeanV2Helper {
028        
029        public static String version = null;
030    
031        public static BeanDefinitionParserDelegate createParser(XmlReaderContext readerContext) {
032            try {
033                String className = "org.apache.xbean.spring.context." + getVersion() + ".XBeanBeanDefinitionParserDelegate";
034                Class clParser = Class.forName(className);
035                Constructor cns = clParser.getConstructor(new Class[] { XmlReaderContext.class });
036                return (BeanDefinitionParserDelegate) cns.newInstance(new Object[] { readerContext });
037            } catch (Throwable e) {
038                throw (IllegalStateException) new IllegalStateException("Unable to create namespace handler for: " + version).initCause(e);
039            }
040        }
041        
042        public static NamespaceHandler createNamespaceHandler() {
043            try {
044                String className = "org.apache.xbean.spring.context." + getVersion() + ".XBeanNamespaceHandler";
045                Class clHandler = Class.forName(className);
046                return (NamespaceHandler) clHandler.newInstance();
047            } catch (Throwable e) {
048                throw (IllegalStateException) new IllegalStateException("Unable to create namespace handler for: " + version).initCause(e);
049            }
050        }
051        
052        private static String getVersion() {
053            if (version == null) {
054                try {
055                    try {
056                        Class.forName("org.springframework.beans.factory.parsing.BeanComponentDefinition");
057                        version = "v2c";
058                    } catch (ClassNotFoundException e) {
059                        Class cl = Class.forName("org.springframework.beans.factory.xml.BeanDefinitionParserDelegate");
060                        try {
061                            cl.getMethod("parsePropertyElements", new Class[] { Element.class, BeanDefinition.class });
062                            version = "v2b";
063                        } catch (NoSuchMethodException e2) {
064                            version = "v2a";
065                        }
066                    }
067                } catch (Throwable e) {
068                    throw (IllegalStateException) new IllegalStateException("Could not create namespace handler for: " + version).initCause(e);
069                }
070            }
071            return version;
072        }
073    }