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 */ 017package org.apache.xbean.spring.context.impl; 018 019import org.springframework.beans.factory.BeanDefinitionStoreException; 020import org.springframework.beans.factory.support.AbstractBeanDefinition; 021import org.w3c.dom.Element; 022 023import java.beans.PropertyDescriptor; 024import java.lang.reflect.Method; 025 026/** 027 * To avoid a runtime dependency on the QName class lets use reflection to 028 * process QName instances. 029 * 030 * @version $Revision: 1.1 $ 031 */ 032public class QNameReflectionHelper { 033 034 protected static Method coerceMethod; 035 protected static Method createMethod; 036 037 public static void coerceNamespaceAwarePropertyValues(AbstractBeanDefinition beanDefinition, Element element, 038 PropertyDescriptor[] descriptors, int index) { 039 QNameReflectionParams params = new QNameReflectionParams(beanDefinition, element, descriptors, index); 040 if (coerceMethod == null) { 041 coerceMethod = findMethod("coerceQNamePropertyValues"); 042 } 043 if (coerceMethod != null) { 044 try { 045 coerceMethod.invoke(null, new Object[] { params }); 046 } 047 catch (Exception e) { 048 throw new BeanDefinitionStoreException("Failed to invoke method: " + coerceMethod + " via reflection: " + e, 049 e); 050 } 051 } 052 } 053 054 public static Object createQName(Element element, String text) { 055 if (createMethod == null) { 056 createMethod = findMethod("createQName"); 057 } 058 if (createMethod != null) { 059 try { 060 return createMethod.invoke(null, new Object[] { element, text }); 061 } 062 catch (Exception e) { 063 throw new BeanDefinitionStoreException("Failed to invoke method: " + createMethod + " via reflection: " + e, 064 e); 065 } 066 } 067 return null; 068 } 069 070 protected static Method findMethod(String name) { 071 try { 072 Class type = PropertyEditorHelper.loadClass("org.apache.xbean.spring.context.impl.QNameHelper"); 073 if (type != null) { 074 Method[] methods = type.getMethods(); 075 for (int i = 0; i < methods.length; i++) { 076 Method method = methods[i]; 077 if (method.getName().equals(name)) { 078 return method; 079 } 080 } 081 } 082 } catch (Throwable t) { 083 // Ignore, this is usually because QName method is not in the classpath 084 } 085 return null; 086 } 087 088}