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 $Revision: 795369 $ 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 XPathBuilder builder = XPathBuilder.xpath(xpath); 040 NamespacePrefix[] namespaces = getExpressionNameSpacePrefix(annotation); 041 if (namespaces != null) { 042 for (NamespacePrefix namespacePrefix : namespaces) { 043 builder = builder.namespace(namespacePrefix.prefix(), namespacePrefix.uri()); 044 } 045 046 } 047 return builder; 048 } 049 050 protected NamespacePrefix[] getExpressionNameSpacePrefix(Annotation annotation) { 051 try { 052 Method method = annotation.getClass().getMethod("namespaces"); 053 Object value = ObjectHelper.invokeMethod(method, annotation); 054 return (NamespacePrefix[])value; 055 } catch (NoSuchMethodException e) { 056 throw new IllegalArgumentException("Cannot determine the annotation: " + annotation + " as it does not have an namespaces() method", e); 057 } 058 } 059 }