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.camel.component.bean; 018 019 import java.lang.annotation.Annotation; 020 import java.lang.reflect.Method; 021 022 import org.apache.camel.CamelContext; 023 import org.apache.camel.Expression; 024 import org.apache.camel.builder.xml.XPathBuilder; 025 import org.apache.camel.language.LanguageAnnotation; 026 import org.apache.camel.language.NamespacePrefix; 027 import org.apache.camel.util.ObjectHelper; 028 029 /** 030 * Factory for the XPath expression annotations. 031 * 032 * @version 033 */ 034 public class XPathAnnotationExpressionFactory extends DefaultAnnotationExpressionFactory { 035 036 @Override 037 public Expression createExpression(CamelContext camelContext, Annotation annotation, LanguageAnnotation languageAnnotation, Class<?> expressionReturnType) { 038 String xpath = getExpressionFromAnnotation(annotation); 039 040 Class<?> resultType = getResultType(annotation); 041 if (resultType.equals(Object.class)) { 042 resultType = expressionReturnType; 043 } 044 045 XPathBuilder builder = XPathBuilder.xpath(xpath, resultType); 046 NamespacePrefix[] namespaces = getExpressionNameSpacePrefix(annotation); 047 if (namespaces != null) { 048 for (NamespacePrefix namespacePrefix : namespaces) { 049 builder = builder.namespace(namespacePrefix.prefix(), namespacePrefix.uri()); 050 } 051 052 } 053 return builder; 054 } 055 056 protected Class<?> getResultType(Annotation annotation) { 057 try { 058 Method method = annotation.getClass().getMethod("resultType"); 059 Object value = ObjectHelper.invokeMethod(method, annotation); 060 return (Class<?>) value; 061 } catch (NoSuchMethodException e) { 062 throw new IllegalArgumentException("Cannot determine the annotation: " + annotation + " as it does not have an resultType() method", e); 063 } 064 } 065 066 protected NamespacePrefix[] getExpressionNameSpacePrefix(Annotation annotation) { 067 try { 068 Method method = annotation.getClass().getMethod("namespaces"); 069 Object value = ObjectHelper.invokeMethod(method, annotation); 070 return (NamespacePrefix[]) value; 071 } catch (NoSuchMethodException e) { 072 throw new IllegalArgumentException("Cannot determine the annotation: " + annotation + " as it does not have an namespaces() method", e); 073 } 074 } 075 }